+

WO2014201700A1 - Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal - Google Patents

Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal Download PDF

Info

Publication number
WO2014201700A1
WO2014201700A1 PCT/CN2013/077699 CN2013077699W WO2014201700A1 WO 2014201700 A1 WO2014201700 A1 WO 2014201700A1 CN 2013077699 W CN2013077699 W CN 2013077699W WO 2014201700 A1 WO2014201700 A1 WO 2014201700A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
signal
light
sub
band
Prior art date
Application number
PCT/CN2013/077699
Other languages
English (en)
Chinese (zh)
Inventor
周雷
彭桂开
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/077699 priority Critical patent/WO2014201700A1/fr
Priority to CN201380001486.4A priority patent/CN103733547B/zh
Publication of WO2014201700A1 publication Critical patent/WO2014201700A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0305—WDM arrangements in end terminals

Definitions

  • the present invention relates to the field of network communication technologies, and in particular, to an optical line terminal, an optical network unit, an optical network system, and a signal processing method. Background technique
  • Passive Optical Network is a point-to-multipoint optical access technology that has gradually become a mainstream technology in the field of broadband access, along with various broadband services such as video conferencing, 3D TV, and mobile back.
  • PON Passive Optical Network
  • Typical PON systems include Optical Line Terminal (OLT), Optical Splitter (Splitter), Optical Network Unit (Optical Network Unit (ONU), wherein the optical beam splitter and the backbone optical fiber form an Optical Distribution Network (ODN), and the plurality of optical network units are connected to the optical beam splitter through the optical fiber, and are connected to the optical fiber through the trunk optical fiber after convergence.
  • the optical network unit shares the backbone fiber through TDMA.
  • Multi Band Frequency Multi Band Frequency
  • Multi-band FDM Division Multiplexing
  • the transmitting end ie, the optical line terminal
  • the transmitting end uses a bit loading algorithm, that is, transmitting a channel with a poor quality on a poor quality channel to turn off a poor quality channel.
  • Multi Band Transmission allows you to take full advantage of bandwidth.
  • this kind of electric multi-band FDM method requires a higher bandwidth of the radio frequency device, and such a radio frequency device has a frequency roll-off, which causes the performance of the radio frequency device to deteriorate at a high frequency, even if the electric multi-band FDM Complex channel estimation and bit loading algorithms are needed.
  • the object of the present invention is to provide an optical line terminal, an optical network unit, an optical network system and a signal processing method, which can transmit the baseband with the best transmission performance of the optical fiber and the radio frequency device, can overcome the high frequency attenuation caused by the dispersion of the optical fiber, and overcome each The photoelectric device has insufficient frequency response and roll-off at high frequencies.
  • a first aspect of the present invention provides an optical line terminal, where the optical line terminal includes: a laser, a combiner, an optical amplifier, a light modulator, a first optical fiber, and a second optical fiber; For generating direct current light;
  • the first optical fiber is connected to the laser and the combiner for exciting the direct current generated by the laser through stimulated Brillouin scattering SBS to form local oscillator and reverse transmission a first sub-wave, and the local oscillator is transmitted to the combiner; wherein the local oscillator is an optical signal whose optical power is less than an SBS threshold, and the first sub-wave is An optical signal in which direct light power is greater than an SBS threshold;
  • the optical amplifier is connected to the first optical fiber and the second optical fiber, and is configured to perform optical signal amplification processing on the first sub-wave, and transmit the amplified optical signal to the first Two optical fibers;
  • the second optical fiber is connected to the optical amplifier and the optical modulator, and is configured to excite the optical signal amplified by the optical amplifier by an SBS to form an optical carrier and a second sub-wave that is reversely transmitted. Transmitting the optical carrier to the optical modulator; wherein, the second sub-optical wave is an optical signal in which the optical power of the optical signal after the amplification process is greater than an SBS threshold, and the optical carrier is the amplification processing The optical signal in the latter optical signal having an optical power smaller than the SBS threshold;
  • the light modulator is connected to the second optical fiber and the combiner for modulating the optical carrier and the input downlink electrical signal to form signal light, and transmitting the signal light to the combiner;
  • the combiner is coupled to the first optical fiber and the optical modulator for using the first
  • the local oscillator light formed by the optical fiber and the signal light formed by the optical modulator combine to form an optical multi-band multiplexed signal and output.
  • the first optical fiber is connected to the laser by a first optical circulator, and the first end of the first optical circulator is The output end of the laser is connected, the second end of the first optical circulator is connected to the first optical fiber, and the direct current light generated by the laser is transmitted to the first optical fiber, the first A third end of the optical circulator is coupled to the input end of the optical amplifier, and transmits the first sub-optical wave formed by the first optical fiber to the optical amplifier.
  • the optical amplifier is connected to the second optical fiber by a second optical circulator, and the first end of the second optical circulator is An output end of the optical amplifier is connected, a second end of the second optical circulator is connected to the second optical fiber, and an optical signal amplified by the optical amplifier is transmitted to the second optical fiber.
  • the third end of the second optical circulator is connected to the next optical amplifier, and the second sub-wave formed in the second optical fiber is transmitted to the next optical amplifier.
  • the frequency difference between the first sub-waves formed in the first optical fiber and the direct current generated by the laser is ⁇ f
  • the frequency difference between the second sub-wave and the first sub-wave formed in the second fiber is ⁇ ⁇
  • the present invention further provides an optical network unit, where the optical network unit includes: a photo-electric receiver, a band-pass filter, and a demodulator;
  • the optoelectronic receiver is configured to receive an optical multi-band multiplexed signal sent by an optical line terminal, where the optical multi-band multiplexed signal includes a local oscillator light and a plurality of signal lights, where the signal light and the local oscillator light respectively Performing coherent mixing to obtain an electrical multi-band multiplexed signal;
  • the band pass filter is configured to perform band-pass filtering on the electrical multi-band multiplexed signal obtained by the optoelectronic receiver to obtain an electrical signal of a required frequency band, and transmit the signal to the demodulator for demodulation.
  • the present invention further provides an optical network system, where the optical network system includes: the optical line terminal according to the embodiment of the present invention, the optical network unit and the optical distribution network according to the embodiment of the present invention.
  • Network ODN the optical network system includes: the optical line terminal according to the embodiment of the present invention, the optical network unit and the optical distribution network according to the embodiment of the present invention.
  • the optical line terminal is connected to the optical network unit through the optical distribution network.
  • the present invention further provides an optical network signal processing method, the method comprising: transmitting, by a laser, direct current light in a first optical fiber, exciting by stimulated Brillouin scattering SBS, forming a local oscillator and a reverse a first sub-wave of the transmission; wherein the local oscillator is an optical signal whose optical power is less than an SBS threshold, and the first sub-wave is an optical signal whose optical power is greater than an SBS threshold;
  • the second sub-wave is an optical signal whose optical power is greater than an SBS threshold in the optical signal after the amplification process
  • the optical carrier is an optical signal whose optical power is less than an SBS threshold in the optical signal after the amplification process, the light
  • the carrier is used to modulate the input downlink electrical signal to form signal light
  • the local oscillator and the signal light combine to form an optical multi-band multiplexed signal, and output the optical multi-band multiplexed signal to the optical network unit.
  • a frequency difference between the first sub-light wave and the direct current light generated by the laser is A f
  • the second sub-wave wave and the first The frequency difference of a sub-wave is A f.
  • the method before the outputting the optical multi-band multiplexed signal to the optical network unit, the method further includes: multiplexing the multiple optical multi-band multiplexed signals In one way, the combined optical multi-band multiplexed signal is transmitted to the optical network unit through the optical fiber.
  • the present invention further provides an optical network signal processing method, where the method includes: receiving an optical multi-band multiplexed signal sent by an optical line terminal, where the optical multi-band multiplexed signal includes a local oscillator and multiple Signal light, wherein the signal light is coherently mixed with the local oscillator light to obtain an electrical multi-band multiplexed signal;
  • the optical line terminal, the optical network unit, the optical network system and the signal processing method provided by the invention generate the optical carrier with stable frequency interval between wavelengths by SBS excitation, so that all sub-band signals have the best transmission performance in the optical fiber and the radio frequency device.
  • the baseband transmits, so as to overcome the high frequency attenuation caused by the dispersion of the optical fiber, and overcome the insufficient frequency response and roll-off of various photoelectric devices at high frequencies.
  • FIG. 1 is a schematic structural diagram of an optical network system according to Embodiment 1 of the present invention.
  • FIG. 2a is a schematic diagram of an optical multi-band multiplexed signal output by an optical line terminal according to Embodiment 1 of the present invention
  • FIG. 2b is a schematic diagram of an electrical multi-band multiplexed signal output by an optoelectronic receiver according to Embodiment 1 of the present invention
  • FIG. 2c is a schematic diagram of a signal outputted by a band pass filter according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural diagram of an optical network system according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic structural diagram of an optical network system according to Embodiment 3 of the present invention.
  • FIG. 5 is a flowchart of a method for processing an optical network signal according to Embodiment 4 of the present invention
  • FIG. 6 is a flowchart of still another method for processing an optical network signal according to Embodiment 4 of the present invention. detailed description
  • the downlink mode of P0N is in broadcast mode, and the broadcast information is distributed to several user terminals through the optical beam splitter.
  • the optical line terminal, the optical network unit, the optical network system and the signal processing method provided by the embodiments of the present invention are compatible with the existing deployed P0N network (P0N based on the optical beam splitter), and are also applicable to other P0N structures, as follows
  • FIG. 1 is a schematic structural diagram of an optical network system according to this embodiment.
  • the optical network system includes: an optical line terminal 1, an optical beam splitter 2, and an optical network unit 3, and the plurality of optical network units 3 are connected to the optical beam splitter 2 through the optical fiber 4, and the optical beam splitter 2 passes through the trunk optical fiber 5 and the optical line The terminals 1 are connected.
  • the optical line terminal 1 includes: a laser 11, a first optical circulator 12, a first optical fiber 13, an optical amplifier 14, a second optical circulator 15, a second optical fiber 16, a light modulator 17, and a combiner 18.
  • the laser 11 is used to generate direct current light.
  • the laser 11 is connected to the first optical fiber 13 via a first optical circulator 12, and the first optical fiber 13 is used to illuminate the direct current ⁇ generated by the laser 11. Excited by stimulated Brillouin scattering SBS, forming a local oscillator and a reverse transmitted first sub-wave ⁇ ⁇
  • the first fiber 13 is also connected to the combiner 18, and transmits the local oscillator to the multiplexer 18.
  • the local oscillator is the direct current ⁇ .
  • the optical power of the medium optical power is less than the SBS threshold, and the first sub-wave human 1 is the direct current ⁇ .
  • the frequency difference is A f , and the magnitude of this frequency difference A f can be controlled.
  • the optical amplifier 14 is connected to the first optical fiber 13 through the first optical circulator 12, and is connected to the second optical fiber 16 through the second optical circulator 15 for the first one formed in the first optical fiber 13
  • the sub-wave ⁇ performs an optical signal amplification process, and transmits the amplified optical signal to the second optical fiber 16 through the second optical circulator 15.
  • the first end of the first optical circulator 12 is connected to the output end of the laser 11, and the second end of the first optical circulator 12 is connected to the first optical fiber 13 to generate the direct current generated by the laser 11. ⁇ . Transfer to the first fiber 1 3 .
  • the third end of the first optical circulator 12 is connected to the input end of the optical amplifier 14, and the first sub-waves formed by the first optical fiber 13 are exclusively transmitted to the optical amplifier 14.
  • the first end of the second optical circulator 15 is connected to the output end of the optical amplifier 14, and the second end of the second optical circulator 15 is connected to the second optical fiber 16, and the optical signal amplified by the optical amplifier 14 is transmitted to
  • the second optical fiber 16 and the third end of the second optical circulator 15 are connected to the next optical amplifier, and the second sub-waves formed in the second optical fiber 16 are transmitted to the next optical amplifier.
  • the second optical fiber 16 is connected to the optical modulator 17, and is configured to excite the optical signal amplified by the optical amplifier 14 through the SBS to form an optical carrier and a second sub-wave ⁇ 2 that is reversely transmitted, and transmit the optical carrier.
  • the light modulator 17 is supplied.
  • the second sub-wave ⁇ 2 is an optical signal in which the optical power of the optical signal after the amplification process is greater than the SBS threshold, and the optical carrier is the optical power of the optical signal after the amplification process is smaller than the SBS threshold. signal.
  • the optical modulator 17 is connected to the second optical fiber 16 and the combiner 18 for modulating the optical carrier formed in the second optical fiber 16 and the input downlink electrical signal to form signal light, and transmitting the signal to the combiner 18.
  • the combiner 18 is connected to the first optical fiber 13 and the optical modulator 17 for combining the local oscillator light formed by the first optical fiber 13 and the signal light formed by the optical modulator 17 to form an optical multi-band multiplexed signal and output , transmitted to the optical beam splitter 2 through the trunk fiber 5.
  • the optical beam splitter 2 splits the optical multi-band multiplexed signal to each optical network unit 3. That is, the signal light formed by each of the second sub-waves passes through the combiner 18 to the optical fiber and the optical beam splitter 2, and finally to each optical network unit 3.
  • the reverse-transmitted sub-waves formed in each fiber may be optically amplified and then excited by SBS to form a next sub-wave of frequency difference Af.
  • the second sub-optical wave formed by the second optical fiber 16 can be connected to the next optical amplifier through the second optical circulator 15, and the next optical amplifier passes through the next optical circulator and the next optical circulator.
  • the second fiber is connected, and the next second fiber is connected to the next light modulator.
  • the sub-waves ⁇ 4 , ⁇ 5 , ⁇ ⁇ can be sequentially generated by SBS excitation.
  • the frequency difference between all adjacent two sub-waves is A f .
  • a plurality of optical carriers can be generated, and a plurality of different downlink electrical signals can be modulated to form a plurality of signal lights, and the combiner 18 combines to form an optical multi-band multiplexed signal.
  • all the transmitted electrical signals are transmitted at the baseband with the best optical channel performance, and are respectively modulated by the optical modulator to the sub-waves ⁇ 1 ⁇ 2 , . . . ⁇ ⁇ . DC light ⁇ .
  • No modulation data, as local oscillator Light is sent to each optical network unit 3 for self-coherent reception to produce an electrical multi-band signal.
  • an optical multi-band frequency division multiplexed signal is formed on the optical line terminal, that is, all electrical signals are in the baseband, and a plurality of fixed sub-waves are separated to carry different baseband electrical signals.
  • the optical network unit 3 includes: a photoreceiver 31, a band pass filter 32, and a demodulator 33.
  • the photoreceiver 31 is for receiving an optical multi-band multiplexed signal transmitted by the optical line terminal 1.
  • the optical multi-band multiplexed signal includes a local oscillator light and a plurality of signal lights, and each of the signal lights is coherently mixed with the local oscillator light to obtain an electrical multi-band multiplexed signal.
  • the band pass filter 32 is configured to perform band-pass filtering on the electrical multi-band multiplexed signal obtained by the photoreceiver 31, obtain an electrical signal of a required frequency band, and transmit the signal to the demodulator 33 for demodulation to obtain an optical line terminal. 1 Received downlink signal.
  • the optical multi-band multiplexed signal as shown in FIG. 2a includes a plurality of signal lights having a spectral wavelength difference of A f , and each of the signal lights A f is usually small, generally not exceeding 10 GHz, and is subjected to coherent mixing.
  • a plurality of electrical signals having a frequency interval of Af on the electrical spectrum are obtained, as shown in Fig. 2b.
  • an electrical signal of a certain frequency band is obtained, as shown in Fig. 2c, an electrical signal with an intermediate frequency of 2 Af is obtained, which can be demodulated by the demodulator 33 according to the existing method.
  • the downlink signal received by the optical line terminal 1. This avoids various degradations in the transmission of electrical signals in the fiber.
  • the optical network unit 3 only needs to use the band pass filter (BPF) to filter out the required electric band for demodulation, which greatly reduces the complexity, power consumption and cost of the optical network unit.
  • BPF band pass filter
  • the embodiment of the invention provides an optical domain multi-band multiplexed passive optical network system, which uses fiber stimulated Brillouin scattering (SBS) to generate multiple sub-waves, each of which is in baseband mode on each optical carrier.
  • SBS fiber stimulated Brillouin scattering
  • Transmission that is, transmission at the baseband with the best transmission performance of fiber and RF devices, can overcome the high-frequency attenuation caused by fiber dispersion, and overcome the insufficient frequency response and roll-off of various photoelectric devices at high frequencies.
  • the frequency interval between the wavelengths of the generated light waves is stable, it is not affected by the laser wavelength jitter, and The sub-waves with narrow frequency intervals are generated with high precision, and the polarization states of the respective optical wavelengths are uniform, so that the multi-band multiplexed signals are obtained by completely coherent mixing in the receiving.
  • the nonlinear mixing noise between the sub-bands is reduced. Since the power of the local oscillator is high, the receiving sensitivity is also improved.
  • optical network units 3 and optical distribution networks have been deployed.
  • the optical distribution network 0DN can remain intact.
  • the optical network unit 2 is directly oriented to the end user.
  • it is necessary to maintain the cost and have sufficient advantages to smoothly upgrade the existing optical network system based on the optical splitter sp litter er while maintaining the 0DN. .
  • the invention can also be applied to a wavelength division multiplexing self-coherent passive optical network system.
  • the optical network system of the present invention includes: a plurality of optical line terminals 1, a plurality of optical network units 3, and an arrayed waveguide grating (AWG). , an arrayed waveguide grating 62 and an optical fiber 4 for connection.
  • the arrayed waveguide grating 61 connected to the plurality of optical line terminals 1 is connected to the arrayed waveguide grating 62 via the trunk optical fiber 5, and the arrayed waveguide grating 62 is connected to the plurality of optical network units 3.
  • each optical line terminal 1 is the same as that of the optical line terminal 1 in the first embodiment.
  • Each optical network unit 3 is the same as the optical network unit 3 in the first embodiment, and the specific processing procedure is the same. Narration.
  • the plurality of optical line terminals 1 are connected to the arrayed waveguide grating 61 via the optical fiber 4.
  • the input end of the arrayed waveguide grating 61 is connected to the combiner 13 of the plurality of optical line terminals 1 for transmitting the plurality of optical line terminals 1
  • the optical multi-band multiplexed signal is combined into a single fiber.
  • a plurality of optical network units 3 are connected to the arrayed waveguide grating 62 via an optical fiber 4, and a plurality of output ends of the arrayed waveguide grating 62 are respectively connected to the photoreceiver 31 of the optical network unit 3, so that the optical network unit 3 passes through the arrayed waveguide grating 62. Receiving an optical multi-band multiplexed signal transmitted by the optical line terminal.
  • the wavelength of the light of the direct current generated by the laser of each optical line terminal 1 is different, and the frequency difference of the wavelength of the light generated by the two optical line terminals 1 is usually much larger than the frequency difference between the sub-waves generated by the same laser through the SBS principle.
  • f in general, A f does not exceed 10 GHz, and the two optical lines end
  • the laser of terminal 1 produces a wavelength difference of up to 100 GHz.
  • the array waveguide grating 61 can be used to combine the optical signals of different wavelengths for transmission, and then the optical signals of different wavelengths can be separated by the arrayed waveguide grating 62.
  • the present invention can also be applied to a time division wavelength division passive optical network system in which an optical beam splitter and an arrayed waveguide grating coexist.
  • the optical network system of the present invention includes: a plurality of optical line terminals 1, an optical beam splitter 2, a plurality of optical network units 3, and an array.
  • the structure in this embodiment is similar to that in the second embodiment, except that in the optical network unit side, after the arrayed waveguide grating 62, the optical beam splitter 2 can be connected to each optical network unit 3, which can be improved. Access user density, extended access distance, suitable for multi-site fusion, to adapt to time-division, wavelength division multiplexing coexistence of passive optical network systems.
  • optical network system provided by the present invention.
  • optical network communication method provided by the present invention will be described in detail below.
  • FIG. 5 is a flowchart of a method for processing an optical network signal according to the embodiment. As shown in FIG. 5, on the optical line terminal side, the optical network signal processing method of the present invention includes:
  • the direct current light generated by the S10 laser is transmitted in the first optical fiber and excited by the SBS to form the local oscillator and the first sub-wave transmitted in the reverse direction.
  • the local oscillator is an optical signal whose optical power is less than an SBS threshold
  • the first sub-wave is an optical signal whose optical power is greater than an SBS threshold.
  • the frequency difference between the first sub-wave and the direct current generated by the laser is ⁇ f .
  • the principle of SBS When entering the laser ⁇ into the fiber. When the optical power reaches a certain value, due to SBS, the sub-wave (Stokers Stockes light wave) is excited. ⁇ Intrusion has the following characteristics: 1) ⁇ . With the reverse; 2) people with ⁇ . There is a certain frequency difference Af, which can be controlled; 3) Enter 1 with people.
  • the polarization state is the same; 4) If the person enters the fiber again, the power reaches the SBS domain value, and the next-order Stokes light ⁇ 2 is excited again, and the ⁇ 2 and the human frequency difference are still Af; 5) SBS in any Excited in the fiber, the excitation domain is lower in the high nonlinear fiber (HNF) with high nonlinear coefficient, and the required fiber length is very short.
  • HNF high nonlinear fiber
  • S1 02 performing optical signal amplification processing on the first sub-wave, and transmitting the amplified optical signal in a second optical fiber, and performing an SBS excitation to form an optical carrier and a second sub-wave that is reversely transmitted.
  • the optical carrier is used to modulate the input downlink electrical signal to form signal light.
  • the second sub-wave is an optical signal whose optical power is greater than an SBS threshold in the optical signal after the amplification process
  • the optical carrier is an optical signal whose optical power is less than an SBS threshold in the optical signal after the amplification process.
  • the frequency difference between the second sub-wave and the first sub-wave is A f.
  • S1 03 The local oscillator and the signal light combine to form an optical multi-band multiplexed signal, and output the optical multi-band multiplexed signal to the optical network unit.
  • the method before outputting the optical multi-band multiplexed signal to the optical network unit, the method further includes: combining the multiple optical multi-band multiplexed signals into one path, and transmitting the combined optical multi-band multiplexed signal through the optical fiber.
  • the plurality of optical multi-band multiplexed signals may be combined into one path by an arrayed waveguide grating, and then transmitted to the optical network unit side through the backbone optical fiber to reach each optical network unit.
  • FIG. 6 is a flowchart of still another method for processing an optical network signal according to the embodiment. As shown in FIG. 6, on the optical network unit side, the optical network signal processing method of the present invention includes:
  • the S20 receives the optical multi-band multiplexed signal sent by the optical line terminal, where the optical multi-band multiplexed signal includes a local oscillator light and a plurality of signal lights, where the signal light is coherently mixed with the local oscillator light to obtain electricity. Multi-band multiplexed signal.
  • the optical network unit may receive the optical multi-band multiplexed signal transmitted by the optical line terminal through the optical beam splitter, or may receive the optical multi-band multiplexed signal transmitted by the optical line terminal through the arrayed waveguide grating.
  • the optical multi-band multiplexed signal sent by the receiving optical line terminal includes:
  • the composite optical multi-band receives a plurality of optical line terminals to transmit a composite optical multi-band multiplexed signal, the composite optical multi-band The multiplexed signals are separated to obtain a single optical multi-band multiplexed signal.
  • the optical line terminal, the optical network unit, the optical network system and the signal processing method provided by the invention are excited by the fiber stimulated Brillouin scattering SBS, and the optical carrier with stable frequency interval between the wavelengths is obtained through the stepwise structure, and the light modulation is utilized.
  • the modulation and loading of the downlink electrical signal enables all sub-band signals to be transmitted in the baseband with the best transmission performance of the optical fiber and the RF device, thereby overcoming the high-frequency attenuation caused by the dispersion of the optical fiber, and overcoming the high-frequency of various photoelectric devices. Insufficient frequency response and roll-off.
  • the frequency interval between the wavelengths of the generated light waves is stable, and is not affected by the laser wavelength jitter, the sub-waves with narrow frequency intervals can be generated with high precision, and the polarization states of the respective optical wavelengths are uniform, ensuring complete coherent mixing in the receiving. Electrical multi-band multiplexed signal. At the same time, the nonlinear mixing noise between sub-bands is reduced during PD reception.
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or technical field Any other form of storage medium known.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un terminal de ligne optique, une unité de réseau optique, un système de réseau optique et un procédé de traitement de signal. Le terminal de ligne optique comprend : un laser, un multiplexeur, un amplificateur optique, un modulateur optique, une première fibre optique et une seconde fibre optique ; la première fibre optique est utilisée pour stimuler, par le biais d'une diffusion de Brillouin stimulée (SBS), la lumière à courant continu générée par le laser, en vue de former une lumière d'oscillation locale et une première sous-onde optique transmise en sens inverse, et pour transmettre la lumière d'oscillation locale vers le multiplexeur ; la seconde fibre optique est utilisée pour stimuler, par le biais d'une SBS, un signal optique amplifié par l'amplificateur optique en vue de former une porteuse optique et une seconde sous-onde optique transmise en sens inverse, et pour transmettre la porteuse optique vers le modulateur optique ; et le multiplexeur est utilisé pour combiner la lumière d'oscillation locale formée au moyen de la première fibre optique et le signal formé au moyen du modulateur optique en vue de former un signal de multiplexage optique multibande, et pour émettre ensuite ledit signal. La présente invention peut permettre de surmonter une atténuation de haute fréquence provoquée par une dispersion de fibres optiques ainsi qu'une réponse de fréquence insuffisante et une réponse contrôlée décroissante de divers dispositifs photoélectriques à des fréquences élevées.
PCT/CN2013/077699 2013-06-21 2013-06-21 Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal WO2014201700A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2013/077699 WO2014201700A1 (fr) 2013-06-21 2013-06-21 Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal
CN201380001486.4A CN103733547B (zh) 2013-06-21 2013-06-21 光线路终端、光网络系统及信号处理方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/077699 WO2014201700A1 (fr) 2013-06-21 2013-06-21 Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal

Publications (1)

Publication Number Publication Date
WO2014201700A1 true WO2014201700A1 (fr) 2014-12-24

Family

ID=50455937

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/077699 WO2014201700A1 (fr) 2013-06-21 2013-06-21 Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal

Country Status (2)

Country Link
CN (1) CN103733547B (fr)
WO (1) WO2014201700A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3288195B1 (fr) * 2016-08-22 2019-04-24 Mitsubishi Electric R&D Centre Europe B.V. Procédé pour détecter un diviseur à une longueur d'ondes de désaccord dans un réseau de transmission à fibre optique
CN110868258B (zh) * 2018-08-27 2022-08-16 中兴通讯股份有限公司 一种相干检测的实现装置、系统及方法
CN112602331B (zh) * 2018-10-02 2022-08-19 华为技术有限公司 具有预定频率间隔的收发方法和装置
CN115333640B (zh) * 2022-08-12 2024-01-16 武汉邮电科学研究院有限公司 相干无源光网络接收机及扩大其动态范围的方法、装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247180A (zh) * 2008-03-18 2008-08-20 浙江大学 基于光纤受激布里渊散射的微波信号频率变换方法及装置
CN101389148A (zh) * 2008-10-29 2009-03-18 上海大学 射频光纤传输系统的上、下行链路结构及为上行链路提供光载波方法
CN102075478A (zh) * 2009-11-24 2011-05-25 华为技术有限公司 无源光纤网络的信号处理方法、设备和系统
US20120219285A1 (en) * 2011-02-28 2012-08-30 David Jimmy Dahan In-band optical signal to noise ratio monitoring technique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004304673A (ja) * 2003-03-31 2004-10-28 Fujitsu Ltd 光伝送装置および伝送路断検出方法
JP4704842B2 (ja) * 2005-08-01 2011-06-22 株式会社日立製作所 Ｗｄｍ型ｐｏｎシステム
CN102237977A (zh) * 2011-07-05 2011-11-09 北京大学 一种偏振交织的ofdm/scfdm无源光网络系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247180A (zh) * 2008-03-18 2008-08-20 浙江大学 基于光纤受激布里渊散射的微波信号频率变换方法及装置
CN101389148A (zh) * 2008-10-29 2009-03-18 上海大学 射频光纤传输系统的上、下行链路结构及为上行链路提供光载波方法
CN102075478A (zh) * 2009-11-24 2011-05-25 华为技术有限公司 无源光纤网络的信号处理方法、设备和系统
US20120219285A1 (en) * 2011-02-28 2012-08-30 David Jimmy Dahan In-band optical signal to noise ratio monitoring technique

Also Published As

Publication number Publication date
CN103733547A (zh) 2014-04-16
CN103733547B (zh) 2016-08-31

Similar Documents

Publication Publication Date Title
RU2562808C2 (ru) Устройство оптического приемопередатчика и система пассивных оптических сетей с мультиплексированием с разделением по длине волны
Smolorz et al. Demonstration of a coherent UDWDM-PON with real-time processing
CN102439876B (zh) 信号发送方法、接收方法、无源光网络pon设备和系统
US9479254B2 (en) Distributed base station signal transmission system and communication system
US8644711B2 (en) Apparatus and method for OLT and ONU for wavelength agnostic wavelength-division multiplexed passive optical networks
WO2009043272A1 (fr) Terminal de ligne optique, réseau optique passif et méthode de transmission d'un signal rf
Cheng Flexible TWDM PON with WDM overlay for converged services
Lin et al. Cross-seeding schemes for WDM-based next-generation optical access networks
CN101702785B (zh) 多波长无源光网络系统、波长重用的方法及光网络单元
Matsumoto et al. Burst-mode coherent detection using fast-fitting pilot sequence for 100-Gb/sM coherent TDM-PON system
Koma et al. Wide dynamic range burst-mode digital coherent detection using fast ALC-EDFA and pre-calculation of FIR filter coefficients
RU2563801C2 (ru) Способ и устройство для приема оптического входного сигнала и передачи оптического выходного сигнала
WO2014201700A1 (fr) Terminal de ligne optique, unité de réseau optique, système de réseau optique et procédé de traitement de signal
JP5621530B2 (ja) 受信機、光スペクトル整形方法、及び光通信システム
WO2020253540A1 (fr) Procédés et dispositifs de commutation et de configuration de longueur d'onde pour réseau optique passif
CN104378171A (zh) 光线路终端、光网络单元以及光通信系统
RU2407169C1 (ru) Устройство и способ для терминала оптической линии (olt) и модуля оптической сети (onu) в не зависимых от длины волны пассивных оптических сетях с мультиплексированием с разделением по длине волны
Huang et al. A novel symmetric lightwave centralized WDM-OFDM-PON architecture with OFDM-remodulated ONUs and a coherent receiver OLT
WO2012106920A1 (fr) Module optique, procédé de transmission par rafales correspondant, système de réseau laser et optique
CN107872288B (zh) 一种wdm pon系统中上行传输方法及其装置
CN113169800A (zh) 接收数据的方法和装置
TW201213910A (en) Reflective semiconductor optical amplifier for optical networks
Presi et al. Low-cost 6.25 GHz UDWDM-PON based on direct intensity-modulated transmitters
CN101895795B (zh) 无源光网络中互激励多波长动态调度的光网络单元装置
EP2693664B1 (fr) Architecture incolore cohérente autonome pour réseau d'accès WDM souple

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13887314

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13887314

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载