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WO2007034563A1 - Amplificateur optique - Google Patents

Amplificateur optique Download PDF

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Publication number
WO2007034563A1
WO2007034563A1 PCT/JP2005/017620 JP2005017620W WO2007034563A1 WO 2007034563 A1 WO2007034563 A1 WO 2007034563A1 JP 2005017620 W JP2005017620 W JP 2005017620W WO 2007034563 A1 WO2007034563 A1 WO 2007034563A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
band
wavelength
optical amplifier
multiplexer
Prior art date
Application number
PCT/JP2005/017620
Other languages
English (en)
Japanese (ja)
Inventor
Tomoaki Takeyama
Keiko Sasaki
Tatsuya Tsuzuki
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2005/017620 priority Critical patent/WO2007034563A1/fr
Priority to JP2007536380A priority patent/JPWO2007034563A1/ja
Publication of WO2007034563A1 publication Critical patent/WO2007034563A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S2301/00—Functional characteristics
    • H01S2301/04—Gain spectral shaping, flattening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/06766—C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/0677—L-band amplifiers, i.e. amplification in the range of about 1560 nm to 1610 nm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
    • H01S3/094011—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094096—Multi-wavelength pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium

Definitions

  • the present invention relates to an optical amplifier, and more particularly to an optical amplifier that amplifies an L-band WDM (Wavelength Division Multiplex) optical signal.
  • L-band WDM Widelength Division Multiplex
  • WDM is the most effective transmission technology to meet such system demands.
  • WDM is a transmission system that multiplexes light of different wavelengths and transmits multiple signals simultaneously using a single optical fiber.
  • Currently, commercialization of WDM is already in progress mainly in North America.
  • EDFA Erbium-Doped Fiber Amplifier
  • EDFA Erbium-Doped Fiber Amplifier
  • EDFA Erbium-Doped Fiber Amplifier
  • EDFA Erbium-Doped Fiber Amplifier
  • EDFA is erbium (Er 3+) ⁇ Ka ⁇ fiber (EDF: Erbium- Do ped Fiber) and the amplifying medium, which can collectively amplifying the optical signal wavelength-multiplexed by using a wide gain band light It is an amplifier.
  • the C band (Conventional band: about 1530 to about 1560 nm) with the highest amplification efficiency was first commercialized, and now the L band (Longer wavelength b and: about 1570 to the next highest amplification efficiency). 1610nm) EDFA has also been commercialized.
  • an L-band EDFA is a multiplexer that combines, for example, an excitation light source (laser diode: LD) 1 that emits excitation light (pump light) of 0.98 m, and L-band signal light and excitation light. 2 and EDF3 into which the combined light is incident.
  • LD laser diode
  • Figure 3 shows the C band and L It is a figure which shows the gain band of a band.
  • the population inversion ratio is about 0.7
  • the 0.98-111 band and 1.48-m band excitation light used in the C-band amplification is supplied to the EDF under the setting of the inversion ratio lower than that of the C band Is done.
  • the inversion distribution rate is low, the amplification rate per unit length is low. Therefore, the EDF for L-band amplification is lengthened to supply almost the same gain to the L-band signal light and to have the same gain as the C-band signal light gain.
  • the amount of absorption per unit length at the excitation light wavelength is less than that at the L-band signal light wavelength. Due to the very small amount of radiation per unit length, as shown in the graph of 0. ge ⁇ mlSOmW in Fig. 6, the inversion distribution rate rises in the vicinity of 2 to 6 m (5 m) EDF length. . Incidentally, in the case of C-band signal light, the amount of radiation per unit length is not as small as that of L-band signal light, so this rise is not as pronounced as in the L-band.
  • C-band ASE Analog spontaneous emission
  • the ASE traveling toward the entrance is further amplified by the excitation light, and the entrance edge force is also emitted as a back ASE.
  • the conversion efficiency deteriorates due to being used for amplification of the excitation light 3 ⁇ 4ack ASE, and the conversion efficiency as high as the C-band EDFA cannot be obtained.
  • Patent Document 1 As a method for suppressing the efficiency degradation peculiar to the L band as described above, for example, there are techniques disclosed in Patent Documents 1 and 2.
  • Patent Document 1 in the L-band EDFA, the optical signal in the C-band EDF amplified by 0.98 m excitation light and the specific wavelength included in the ASE (the highest efficiency in the C-band is 1.55 m) A configuration in which this amplified light is used as a tap coupler or pumping light for an L-band optical signal is disclosed.
  • Patent Document 1 has the following problems.
  • C van EDF hardly amplifies L-band signal light.
  • the overall EDFA NF (Noise Figure) is almost equivalent to the loss caused by optical components such as tap couplers and filters placed between C-band EDF and L-band EDF, and isolators to prevent oscillation. : Noise figure) will deteriorate.
  • two EDFs are required: a first EDF that generates C-band ASE and a second EDF with L-band amplification. This leads to an increase in cost.
  • Patent Document 2 discloses a method of using 0.98 m residual pumping light output from C-band EDF and 1.55 m band ASE as excitation light for L-band EDF using a circulator. Yes.
  • Patent Document 2 has the following problems. First, the L-band EDF that amplifies the signal light is backward pumped. For this reason, the inversion distribution rate at the entrance to determine NF is greatly reduced, and it is thought that NF degradation will become severe. Second, a special part called a circuit is required. Furthermore, as in the technique of Patent Document 1, two EDFs are required, a first EDF that generates C-band ASE and a second EDF for L-band amplification.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-243755
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-94158
  • An object of the present invention is to provide an L-band optical amplifier capable of improving efficiency while suppressing an increase in cost.
  • the present invention employs the following configuration in order to achieve the above object.
  • the present invention includes a rare earth element-doped optical amplification medium having an incident end and an output end, and an L-band signal light is incident on the incident end.
  • a first light source that generates first light for exciting the rare earth element-doped optical amplification medium; a second light source that generates second light that promotes radiation in the rare earth element-doped optical amplification medium;
  • a multiplexer that multiplexes the first and second lights from the first and second light sources; And a supply unit that supplies the light combined by the multiplexer to the incident end or the output end.
  • the supply unit supplies the light combined by the multiplexer to the incident end
  • a second multiplexer that combines the first and second lights from the third and fourth light sources; and a second multiplexer that supplies the light combined by the second multiplexer to the emission end. And a supply unit.
  • the first light has a wavelength shorter than a C-band wavelength
  • the second light has a wavelength longer than the first light and shorter than the L band.
  • the second light has a wavelength near a radiation peak in the rare earth element-doped amplification medium.
  • the wavelength of the second light is about 1.
  • L 55 m More preferably, it is about 1.53 m.
  • the power of the second light is about
  • a power ratio between the second light and the first light is about -50 to OdB.
  • the rare earth element-doped optical amplifying medium of the optical amplifier according to the present invention is an erbium-doped fiber or an erbium-doped optical waveguide.
  • FIG. 1 is a diagram showing a configuration example of a conventional EDFA.
  • FIG. 3 is a diagram showing gain bands of C band and L band.
  • FIG. 4 is a diagram showing a configuration example of an embodiment of an optical amplifier according to the present invention.
  • FIG. 5 is a graph showing the relationship between wavelength and absorbed Z radiation of EDF.
  • FIG. 6 is a graph showing the relationship between EDF length and population inversion rate.
  • FIG. 7 is a graph showing the relationship between the wavelength at the incident end of the EDF and the back ASE.
  • FIG. 8 is a graph showing the relationship between wavelength and gain.
  • FIG. 8 is a table summarizing the characteristics of Examples and Comparative Examples 1 and 2.
  • FIG. 9 is a graph showing wavelengths that can be taken as second excitation light.
  • FIG. 11 is a graph showing a range that can be taken as the second pumping light power.
  • FIG. 12 is a graph showing a range that can be taken as a power ratio between the first excitation light and the second excitation light.
  • FIG. 13 is a diagram showing a modification of the embodiment, and shows a configuration example when the present invention is applied to a backward excitation EDFA.
  • FIG. 14 is a diagram showing a modification of the embodiment, and shows a configuration example when the present invention is applied to a bidirectional excitation EDFA.
  • FIG. 4 is a diagram showing an embodiment (configuration example) of an optical amplifier according to the present invention.
  • Fig. 4 shows an EDFA that amplifies L-band signal light by forward pumping as an optical amplifier.
  • the EDFA 10 includes an EDF 11 as a rare earth element-doped optical amplification medium having an incident end and an output end, a first light source 12, a second light source 13, a first light source 12, and A multiplexer 13 that multiplexes two wavelengths from the second light source 13, a L-band signal light, and a multiplexed light from the multiplexer 13, and combines them as a supply unit that is sent to the incident end of the EDF 15. It consists of waver 15.
  • the EDF 11 is an EDF for L-band amplification, and has an EDF length that is sufficiently longer than the C-band EDF so that the gain of the L-band signal light can be obtained at a predetermined value (for example, 14 dB) or more.
  • the first light source 12 is configured using, for example, a semiconductor laser (LD).
  • the first light source 12 emits first light that excites EDF. That is, the first light source generates pumping light having a wavelength shorter than the C band as pumping light (pump light) for the L band signal light.
  • the first light source 12 for example, a general-purpose 0.88, 0.88 or 1.48 m band excitation light (first light) used as an L-band excitation light source is applied. be able to.
  • the second light source 13 is configured using, for example, an LD.
  • the second light source 13 emits light having a wavelength that promotes radiation in the EDF 11 (second light).
  • the second light source 13 generates, as the second light, light having a wavelength longer than the wavelength of the excitation light output from the first light source 12 and shorter than the L band.
  • the wavelength of the second light is set to be near the radiation peak of EDF11.
  • FIG. 5 is a graph showing the relationship between the wavelength and the absorbed Z radiation of EDF.
  • the lower graph shows the absorption characteristics of EDF when EDF excitation light (for example, 0.98 / zm) is not incident
  • the upper graph shows the excitation light incident on EDF. Shows the radiation characteristics of EDF.
  • the wavelength near the peak (radiation peak) in this graph is set as the wavelength of the second light.
  • the wavelength around 1530 nm (about 1.53 ⁇ m) is set as the wavelength of the second light.
  • an lmW class low output LD that generates the second light having a desired wavelength can be used.
  • the multiplexers 14 and 15 for example, a WDM optical fiber force bra is applied.
  • the multiplexer 14 multiplexes the first light (excitation light) from the first light source 12 and the second light (referred to as “radiation promoting light”) from the second light source 13, Send to 15.
  • the multiplexer 15 has one wave or wavelength multiplexed L-bar. Signal light is incident.
  • the multiplexer 15 combines the L-band signal light and the light combined by the multiplexer 14 and enters the incident end of the EDF 11.
  • the first light from the first light source 12 (light that generates excitation light of EDF11 (absorption (increased inversion distribution rise): for example, 0.98 / ⁇ ⁇ )
  • the second light from the second light source 13 (light having a wavelength in the vicinity of the emission peak of EDF 11 (about 1.53 m) (radiation-promoting light (radiation-induced light)) is multiplexed by the multiplexer 14.
  • the light combined by the multiplexer 14 is combined with the L-band signal light by the multiplexer 15 and is incident on the incident end of the EDF 11.
  • the wavelength having the highest radiation characteristic is selected as the wavelength of the radiation promoting light (second light).
  • This wavelength is the most effective factor that causes (or induces) radiation in EDF11, and the inversion distribution near the EDF11 entrance (2-6 m, more specifically around 5 m), as shown in Figure 6.
  • Rise is suppressed. Suppressing the rise of the population inversion means that the generation of ASE near 5m is suppressed. This suppresses the generation of back ASE that travels in the direction of the entrance and is amplified by the excitation light and radiated at the entrance edge.
  • the excitation light first light
  • the conversion efficiency (amplification efficiency) of EDFA is improved.
  • the EDFA 10 can be configured by adding a low-power LD (second light source 13) and a multiplexer 14 to the configuration of the conventional EDFA. Therefore, efficiency can be improved at low cost.
  • a low-power LD second light source 13
  • a multiplexer 14 to the configuration of the conventional EDFA. Therefore, efficiency can be improved at low cost.
  • first and second lights described above both mean light that contributes to amplification of signal light.
  • EDF having a length of 28.5 m was applied as EDF11.
  • the L-band signal light amplified by the EDFA 10 32 waves (channels) at intervals of 100 GHz from 1577.03 nm to 1603.17 nm, and light of -20 dBmZch was applied.
  • a pumping LD that outputs 0.98 m and 130 mW light was used.
  • the EDF emission peak wavelength depends on the material doped with erbium (Er) (such as A1).
  • the emission peak wavelength of EDF11 applied in this example was 1.53 / zm. For this reason, an LD that outputs 1.53 / zm light (radiation promoting light) was used as the second light source 13.
  • the power of radiation promotion light was lmW.
  • FIG. 6 is a graph showing the relationship between the EDF length measured for the example and the population inversion ratio.
  • FIG. 7 is a graph showing the relationship between the wavelength and backASE measured for the example.
  • FIG. 8 is a graph showing the relationship between the wavelength and gain measured for the example.
  • FIG. 6 and FIG. 7 show the measurement results for Comparative Example 1 as an example to be compared with the Example
  • FIG. 8 shows the measurement results for Comparative Example 2 as an example to be compared with the Example. It is shown.
  • FIG. 9 is a table summarizing the measurement results of (2) Examples, (1) Comparative Example 1 and (3) Comparative Example 2. Details of Comparative Example 1 and Comparative Example 2 are as follows.
  • Comparative Example 1 As Comparative Example 1, an EDFA having the configuration shown in FIG.
  • Comparative Example 2 In addition to the configuration of Comparative Example 1, an excitation light force consisting of 5 C-band 5 nm-spacing 5 waves was made incident on the incident end of DF11. This excitation light is assumed to use ASE that spreads over the entire C band for excitation of EDF. Conditions other than those relating to incident light are the same as in the example.
  • FIG. 6 shows the measurement results when the light according to the example and the comparative example 1 is incident.
  • Comparative Example 1 conventional EDFA
  • the inversion distribution rate near the EDF11 entrance rises, and then the inversion distribution rate gradually increases toward the output end. Decreases.
  • this rising part appears at the incident end of EDF11 as a backASE in the C-band (peak: about 1530 nm) that causes deterioration of the excitation efficiency.
  • FIG. 8 shows a comparison between Example and Comparative Example 2.
  • the total power of the ASE (C band 7 waves) used in Comparative Example 2 and the radiation promoting light (1.53 m) in the example was set to lmW.
  • a comparison of the conversion efficiency between Example and Comparative Example 2 is shown in FIG.
  • FIG. 10 is a graph showing the relationship between the excitation wavelength (second light wavelength), the conversion efficiency, and the EDF radiation coefficient.
  • Fig. 10 we focus on the graph showing the relationship between conversion efficiency and wavelength. As a result, it can be seen that conversion efficiency is higher than those of Comparative Examples 1 and 2 in the wavelength band of 1490 nm to 1550 nm (about 1.49 to 1.55 m).
  • the conversion efficiency has a peak at a wavelength of 1532 nm (about 1.53 ⁇ m).
  • the conversion efficiency is maximized at the EDF radiation peak. Therefore, in the present invention, as the second light (radiation promoting light), the wavelength near the radiation peak (for example, around 1.53 m) is most preferably selected as the wavelength of the radiation peak. Is next preferred. In addition, selecting a wavelength near 1.53 m is preferable from the viewpoint of efficiently using excitation light of 0.98 m in view of the comparison result with Comparative Example 2.
  • the wavelength of the second light can be selected from a predetermined range centered on the radiation peak.
  • the peak wavelength (1532nm: -5.3dB) force is also reduced when the conversion efficiency decreases by ldB, 2dB, and 3dB.
  • m the peak wavelength
  • 1518-1545 approximately 1.51-: L 54 ⁇ m
  • It was 1512-1548 nm about 1.51-: L55 / zm.
  • One wavelength in these ranges can also be selected as the second light.
  • FIG. 11 is a graph showing the relationship between the power of 1.53 / z m pumping light (second light) and the conversion efficiency.
  • 7 dBm which is the power when the conversion efficiency reaches the peak, can be selected as the optical power.
  • the power of the second light can be selected as about -30 to 20 dBm as shown in FIG. Furthermore, in FIG. 11, the optical power ranges when the conversion efficiency is reduced by 1 dB, 2 dB, and 3 dB are ⁇ 10 to 17 dBm, 19 to 20 dBm, and ⁇ 25 to 22 dBm.
  • the power of the second light can be selected from any of these ranges.
  • FIG. 12 is a graph showing the power ratio between the second light (1.53 ⁇ m) and the first light (0.98 ⁇ m).
  • 1 ldB which is the power ratio when the conversion efficiency reaches its peak, can be selected.
  • the power ratio as shown in FIG. 12, an approximately -50 to OdB force can be selected. Further, in FIG. 12, the optical power ranges when ⁇ 1 dB, 2 dB, and 3 dB respectively decrease from the peak conversion efficiency were ⁇ 32 to ⁇ 6 dB, ⁇ 40 to 1 ldB, and ⁇ 47 to 0 dB.
  • the power ratio can be selected from any force in these ranges.
  • FIG. 13 is a diagram illustrating a configuration example of the EDFA 10A that performs backward excitation
  • FIG. 14 is a diagram illustrating a configuration example of the EDFA 10B that performs bidirectional excitation.
  • an EDFA 10A combines a first light source 12A that emits first light, a second light source 13A that emits second light, and a first light and a second light.
  • a multiplexer 14A and a multiplexer 15A as a supply unit for sending the combined light to the output end of the EDF 11 are provided. The same components as those shown in Fig. 4 can be applied.
  • the EDFA 10B includes a configuration related to forward excitation shown in FIG. And the configuration related to the backward pumping shown.
  • the EDFA 10B transmits the third light source 12B that generates the first light, the fourth light source 13B that generates the second light, and the first and second lights.
  • a multiplexer 14B as a second multiplexer for multiplexing and a multiplexer 15B as a second supply unit for supplying the light combined by the multiplexer 14B to the emission end of the EDF 11 are provided.
  • FIGS. 13 and 14 can be the same as the components shown in FIG. 4 (first light source 12, second light source 13, multiplexers 14 and 15). Therefore, description of each component is omitted.
  • EDF is applied as a rare earth element-doped optical amplification medium.
  • EDF it is also possible to apply an optical waveguide doped with erbium.
  • the optical amplifier to which erbium is applied as the rare earth element has been described.
  • the present invention is applied to an optical amplifier using an amplification medium doped with a rare earth element different from erbium (for example, prasedium or thulium).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

L’invention concerne un amplificateur optique, comprenant un milieu d’amplification optique auquel est ajouté un élément des terres rares et présentant une extrémité d’entrée recevant un signal lumineux de la bande L, et une extrémité de sortie ; une première source lumineuse générant une première lumière servant à exciter le milieu d’amplification ; une deuxième source lumineuse générant une deuxième lumière servant à accélérer le rayonnement dans le milieu d’amplification ; un multiplexeur servant à multiplexer la première lumière et la deuxième lumière ; et une partie servant à transmettre la lumière multiplexée du multiplexeur à l’extrémité d’entrée ou à l’extrémité de sortie.
PCT/JP2005/017620 2005-09-26 2005-09-26 Amplificateur optique WO2007034563A1 (fr)

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PCT/JP2005/017620 WO2007034563A1 (fr) 2005-09-26 2005-09-26 Amplificateur optique
JP2007536380A JPWO2007034563A1 (ja) 2005-09-26 2005-09-26 光増幅器

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023071306A1 (fr) * 2021-10-28 2023-05-04 华为技术有限公司 Amplificateur et système

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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