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 PDFInfo
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
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.
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)
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)
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)
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)
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 |
-
1994
- 1994-11-18 DE DE4441180A patent/DE4441180C1/de not_active Expired - Fee Related
-
1995
- 1995-11-07 WO PCT/DE1995/001538 patent/WO1996016345A1/fr active Application Filing
Patent Citations (1)
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)
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)
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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