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WO1996016345A1 - Source d'impulsions dotee d'un laser et d'un circuit en chaine, monte a la suite, de deux modulateurs commandes par des tensions sinusoïdales - Google Patents

Source d'impulsions dotee d'un laser et d'un circuit en chaine, monte a la suite, de deux modulateurs commandes par des tensions sinusoïdales Download PDF

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Publication number
WO1996016345A1
WO1996016345A1 PCT/DE1995/001538 DE9501538W WO9616345A1 WO 1996016345 A1 WO1996016345 A1 WO 1996016345A1 DE 9501538 W DE9501538 W DE 9501538W WO 9616345 A1 WO9616345 A1 WO 9616345A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
pulse source
sinusoidal
modulators
voltage
Prior art date
Application number
PCT/DE1995/001538
Other languages
German (de)
English (en)
Inventor
Erich Gottwald
Chandan Das
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1996016345A1 publication Critical patent/WO1996016345A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/21—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  by interference
    • G02F1/212—Mach-Zehnder type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/16—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 series; tandem
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/54—Optical pulse train (comb) synthesizer

Definitions

  • Pulse source with a laser and a series connection of two modulators controlled with sinusoidal voltages
  • mode-locked or Q-switched lasers or laser diodes directly modulated by corresponding electrical pulses are used as the optical pulse sources running at a defined repetition rate.
  • a disadvantage of mode-locked and Q-switched lasers is that only discrete pulse repetition rates can be set without integral adjustment of the laser resonator (integer multiples of the mode spacing); automatic readjustment appears to be very difficult. To the intensity or amplitude of one
  • the laser diode In order to modulate semiconductor lasers of outgoing light by direct modulation, the laser diode must be supplied with a relatively high current; It is also problematic that an undesired chirp is also associated with such direct modulation, i.e. a change in the wavelength of the emitted light depending on the level of radiation.
  • Modified direct modulation methods provide a desired frequency (or also phase) modulation of the laser with subsequent conversion into intensity modulation by means of a Mach-Zehner interferometer connected behind the semiconductor laser; an additive or subtractive interference of two mutually delayed beam paths is carried out and a corresponding intensity modulation is achieved at the output (Electronics Letters, Vol. 28, No .12, (02.07.92), pp 1305 - 1306, U. Fischer: lOGBit / s-
  • Electro absorption modulators In another known pulse source, a laser is followed by a chain connection of two electro absorption modulators (EAM) controlled with sinusoidal voltages, whereby short pulses with repetition frequencies of up to 5 GHz occur.
  • EAM electro absorption modulators
  • Electro absorption modulators Electro absorption modulators, however, only tolerate relatively low optical power levels and are otherwise too slow for higher repetition rates.
  • the invention now shows a way to an optical pulse source avoiding the disadvantages mentioned.
  • the invention relates to a pulse source with a laser and a chain circuit connected downstream of it two modulators controlled with sinusoidal voltages;
  • this pulse source is characterized in that a CW (continuous wave) -operated laser is followed by the chain connection of two amplitude modulators based on two-beam interference, in particular Mach-Zehnder interferometers, which are coupled with two sinusoidal-phase-locked coupled sinusoidal ones Modulator voltages of the frequency f or 2f - where 2f is the pulse repetition rate - are controlled, both two-beam interferometers being operated at full transmission at the operating point and the control amplitudes selected so that the respective modulator is at the peak values of the modulation voltage a state of minimal, ie at most, the transmission is negligibly low.
  • an optical pulse source with a laser LD and two amplitude modulators MZI1, MZI2 cascaded downstream of it is schematically sketched in a scope necessary for understanding the invention, each of which is supplied with a sinusoidal voltage.
  • the laser LD which is expediently formed by a laser diode, operates in CW (continuous wave) mode.
  • the two amplitude modulators which are formed, for example, with two Mach-Zehnder interferometers and are based on the principle of two-beam interference, are each operated at a full transmission operating point and controlled from this operating point by a sinusoidal modulation voltage, the respective transmission being in a cos 2 dependency on the control voltage changes.
  • the first amplitude modulator MZI1 is controlled by a sine voltage of frequency f generated by a corresponding, tunable source G
  • the second amplitude modulator MZI2 is controlled by a sine voltage of frequency 2f coupled rigidly to it.
  • the sine voltage of frequency 2f can be generated from the sine voltage of frequency f by frequency doubling in a frequency converter f / 2f.
  • the amplitudes of the two modulation voltages are chosen so that the peak values of the respective modulation voltage bring the respective modulator into a state of minimal, ie at most negligible, low transmission.
  • repetition ranges 1 / ⁇ T of approximately 20 GHz and pulse durations ⁇ t ⁇ 8 ps can be realized.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Semiconductor Lasers (AREA)

Abstract

Le circuit en chaîne de deux modulateurs d'amplitude basés sur une interférence à deux faisceaux est monté à la suite d'un laser continu, ces deux modulateurs étant commandés par deux tensions sinusoïdales verrouillées en phase, de fréquence f et 2f (2f étant le taux de répétition des impulsions), deux interféromètres à deux faisceaux étant mis en fonction, au point de fonctionnement, en transmission maximale, et les amplitudes de commande étant sélectionnées de telle façon que pour des valeurs de crête de la tension de modulation, chaque modulateur se trouve dans un état de transmission minimal.
PCT/DE1995/001538 1994-11-18 1995-11-07 Source d'impulsions dotee d'un laser et d'un circuit en chaine, monte a la suite, de deux modulateurs commandes par des tensions sinusoïdales WO1996016345A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4441180.4 1994-11-18
DE4441180A DE4441180C1 (de) 1994-11-18 1994-11-18 Pulsquelle mit einem Laser und einer ihm nachgeschalteten Kettenschaltung zweier mit sinusförmigen Spannungen angesteuerter Modulatoren

Publications (1)

Publication Number Publication Date
WO1996016345A1 true WO1996016345A1 (fr) 1996-05-30

Family

ID=6533629

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001538 WO1996016345A1 (fr) 1994-11-18 1995-11-07 Source d'impulsions dotee d'un laser et d'un circuit en chaine, monte a la suite, de deux modulateurs commandes par des tensions sinusoïdales

Country Status (2)

Country Link
DE (1) DE4441180C1 (fr)
WO (1) WO1996016345A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925265B2 (en) 1997-08-04 2005-08-02 Cisco Photonics Italy S.R.L. System and method of high-speed transmission and appropriate transmission apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50000843D1 (de) * 1999-05-27 2003-01-09 Siemens Ag Verfahren und anordnung zur erzeugung von rz-signalen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505587A (en) * 1981-08-14 1985-03-19 Massachusetts Institute Of Technology Picosecond optical sampling

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293545A (en) * 1992-07-27 1994-03-08 General Instrument Corporation Optical source with reduced relative intensity noise

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505587A (en) * 1981-08-14 1985-03-19 Massachusetts Institute Of Technology Picosecond optical sampling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TANAKA H ET AL: "Optical short pulse generation by double gate operation of tandem connected electroabsorption modulators driven by sinusoidal voltages", ELECTRONICS LETTERS, 5 AUG. 1993, UK, vol. 29, no. 16, ISSN 0013-5194, pages 1449 - 1451, XP000388437 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6925265B2 (en) 1997-08-04 2005-08-02 Cisco Photonics Italy S.R.L. System and method of high-speed transmission and appropriate transmission apparatus
US7010231B1 (en) 1997-08-04 2006-03-07 Cisco Photonics Italy S.R.L. System and method of high-speed transmission and appropriate transmission apparatus

Also Published As

Publication number Publication date
DE4441180C1 (de) 1996-02-15

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