CN1753334A - Method and apparatus for distortion control for optical transmitters - Google Patents
Method and apparatus for distortion control for optical transmitters Download PDFInfo
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- CN1753334A CN1753334A CNA200510103273XA CN200510103273A CN1753334A CN 1753334 A CN1753334 A CN 1753334A CN A200510103273X A CNA200510103273X A CN A200510103273XA CN 200510103273 A CN200510103273 A CN 200510103273A CN 1753334 A CN1753334 A CN 1753334A
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- 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
- H04B10/503—Laser transmitters
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- 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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06837—Stabilising otherwise than by an applied electric field or current, e.g. by controlling the temperature
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- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
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- 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
- H04B10/25—Arrangements specific to fibre transmission
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- 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
- H04B10/516—Details of coding or modulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Optical Communication System (AREA)
- Semiconductor Lasers (AREA)
Abstract
A method of manufacturing an optical transmitter includes assembling a laser device on a module including a temperature sensor and a temperature controller. An optimum operating temperature of the laser to minimize optical distortion is determined at a temperature within a range between which distortions were determined at multiple temperatures. The temperature controller is selectively adjusted so as to operate the laser at the optimum temperature. The distortion may also be monitored during active laser operation. The temperature controller may be selectively adjusted, based on the monitoring of the distortion, so as to operate the laser at a new controlled temperature nearer that which produces the temperature-dependent distortion minimum.
Description
Technical field
The present invention relates to optical transmitter, and specifically say to relate to and make a kind of optical transmitter to minimize the temperature-dependent distorted characteristic of the optical signalling that sends by an optical fiber.
Background technology
The modulator-demodulator substitute that transmits simulation or binary digital information via the voltage signal on the conductor uses optics (light) signal on the fiber optic cables.The signal of telecommunication (high/low voltage) from analog radio frequency or digital circuit can convert to through amplitude or warbled optical signalling such as the LED or the solid-state laser of VCSEL or edge-emitting laser.Similarly, optical signalling can transform the telegram in reply form again by photodiode or the phototransistor that use is used for being introduced into the input of amplifier, demodulator or other type circuit.
Laser resonator has two kinds of dissimilar patterns: horizontal and vertical.Transverse mode shows in its cross sectional intensity distribution that is in light beam.Vertical pattern takes place under the different wave length of described resonance in the gain bandwidth of described laser corresponding to the different resonance along the length of laser cavity.When the not collinear relative intensity corresponding to different vertical patterns is offset under specific circumstances, the emergence pattern saltus step.In order to utilize an optical transmitter that one reliable communication link is provided, need prevent the moding in the laser used in the described optical communication applications.
The factor that whether is easy to the emergence pattern saltus step in a laser is the extent of stability of described laser.The stability that has a lot of forms, comprising wavelength stability, pulse pulsed energy stability, repetition rate stability, thermal stability, bandwidth stability, and these stability can attempt controlling with the whole bag of tricks.For example, energy stability and repetition rate stability usually depend on the electric energy that is input to gain media or the stability of luminous energy.The degree of wavelength or bandwidth stability can be depending on the quality and the other factors of resonator material.Degree of heat stability can influence wavelength or bandwidth stability, whether and can be depending on the thermal capacity of described gain media and cooling and/or heating element usually provides with a heat sensor (being temperature controller), heat exchanger or other described thermo-monitor and heat transfer device, and the degree of these equipment thermal control sensitiveness of showing how.Carried out the generation that various developments are stablized the various parameters of the Optical Maser System that comprises operating temperature and prevented moding.
From optical side send the digital information of optical form can be simply the transmitter of photoelectric detector by the aiming distant location or the laser or the laser array of transceiver finish outdoor, but the interference of light beam, beam divergence, scattering, chromatic dispersion etc. makes and is difficult to not have the described light beam of any remarkable distortion ground transmission.A kind of method of the problem of avoiding outdoor optical data transmission is for transmitting light pulse along an optical fiber.Optical fiber will send a branch of light, and with the conduction electron, it has the advantage of avoiding inductance, electric capacity fully and suffering all associated problem of signal of telecommunication external disturbance as copper cash.
Even for the single-mode of optical medium, the light pulse than the short path emission of being passed described medium by employings such as LED, VCSEL, edge-emitting lasers will be than the faster arrival detector of light pulse that adopts longer path.The material that forms optical medium give to a certain degree chromatic dispersion or the group velocity of the different frequency of institute's detection signal change.The result is the amplitude and the phase distortion of information carrying signal (information-carryingsignal).For wideer bandwidth or modulating frequency and when whole medium length increased, it is more abominable that this problem becomes.For very long distance, at optical communication equipment, or even the light pulse with very narrow bandwidth also will cause the distortion of mux--out signal exhibits undesirable level.
Simply discuss as mentioned, even with the single-mode laser of smaller bandwidth and even when take steps the stable optical pulse by conventional method is careful, the known optical signalling displaying distortion to a certain degree that on an optical medium, sends from the modulated laser transmitter.Made great efforts to develop the distortion that the electronics predistortion circuit reduces optical signalling, for example referring to United States Patent (USP) the 6th, 288,814,5,798,854,5,252,930,5,132,639 and 4,992, No. 754, described patent is incorporated herein by reference.Distortion appears at the output of outside cavity gas laser (ECL), and it is the result of described laser design.Though also present distortion when described laser is linked to an optical fiber, it is strong and changeable not as the ECL distortion.
Owing to the remarkable thermal impact of distortion, but the preferred disposition predistortion circuit is operated with the operating temperature that depends on the non-linear laser device.Can provide a plurality of predistortions to amplify (pre-distorter) and be provided with, for example be used to control the voltage that predistortion is amplified output so that can select specific setting according to the monitoring temperature of described laser.In addition, can come any variation of monitoring laser output by an optical fiber lock (fiber tap) with detected amplitude or phase place, and respond it, can (for example) serviceability temperature transducer and thermoelectric-cooled agent (TEC) is controlled and stabilized lasers actuator temperature self a little, make to come by regulating predistortion circuit _ _ _ thermal change is to the influence of distortion.Owing to its materially affect, need further control and reduce specifically to say the distortion of the optical signalling (it comprises a chip of laser and an external reflector) that produces by outside cavity gas laser to the optical communication signal quality.
Learn that from other researcher's works the distortion level of the optical signalling through sending the outside cavity gas laser depends on the temperature of described laser transmitting set.In addition, learn also that from described works described distortion has a recognizable minimum value usually under a specified temp of the laser transmitting set of the single operation pattern that changes by laser.Therefore, the configuration of a target of the present invention for providing a kind of manufacturing one method and that is used for the laser transmitting set system of optical communication to be used for described system, described laser transmitting set system is thermally-stabilised at the described distortion minimum value place of the laser that is utilized.
Summary of the invention
Though have bad optical signalling distortion in the laser transmitting set system that is used for communicating by letter, specifically say and in some cases the optical signalling distortion to be reduced or minimize by control laser transmitting set temperature.The present invention considers that the lasing light emitter of optical transmitter produces the modulated optics signal with optical signalling distorted characteristic, when described signal sent by the dispersive medium such as air, water, glass, plastics etc., it had the optical signalling distorted characteristic that becomes with the laser operation temperature.Should further recognize existence one minimum value in the distortion that is in these optical signal transmitter systems in the laser single operation vertical pattern and the relation curve of laser operation temperature.Therefore, be preferably under the temperature that has the minimum distortion value and the approaching described laser of described temperature operation.
Have temperature-dependent minimum distortion value without exception though it should be understood that the distortion curve of these laser transmitting set systems in operator scheme, the minimum value of each laser transmitting set system all is not presented under the same temperature.That is, for each Optical Maser System, it is different that there is the temperature of minimum distortion value in each laser transmitting set.If determined the temperature of the minimum distortion value of each laser transmitting set system, so can mode of operation described system is approximately maintained that temperature and therefore maintain under that minimum distortion value.When with temperature maintenance in the following time of temperature that produces a minimum distortion value approximately, the moding that caused by heat can not take place, and minimized distortion is acknowledged as generally also in a laser transmitting set system useful.
Therefore a kind of method of making an optical transmitter system is provided.Described optical transmitter system comprises that one is used to produce the laser or the laser array of a modulated optics signal, and described optical signalling is coupled to a dispersed light to be learned medium and send by described dispersing optics medium.Described laser has a temperature-dependent optical signalling distorted characteristic at its output.Described distorted characteristic has a minimum value in the operating temperature range between first predetermined temperature and the second higher predetermined temperature.Described first and second temperature are defined by the laser that produces light radiation when being lower than first temperature and be higher than operation under the temperature of second temperature under different mode.
Described manufacture method comprises that a laser equipment is assemblied in one to be comprised on the module of a temperature sensor and a temperature controller.The optimum operating temperature of determining described laser is to minimize the distortion under the temperature between first and second temperature.Selectivity is regulated described temperature controller so that operate described laser under about optimum temperature.
Described optimum temperature can be by at first being set at described temperature first temperature or second temperature or away from another temperature of described temperature minimum value and measure distortion and determine.Follow described temperature and also measure distortion once more towards another increase in described first and second temperature in temperature minimum value direction.Repeat described increase and measure to be scanned fully or be scanned and determine up to minimum value at least up to the temperature range between described first and second scope.Preferably in described temperature range or have in the temperature of distortion minimum value stepping at least and or scanning described temperature.
Should further recognize and can be advantageously combine one online (on-line) method of utilizing separately or with manufacture method of the present invention.Described method can comprise the separating part of measurement active laser transmission or the distortion of all or part of approximately part that temporary transient off-line transmits.Just determine that the distortion minimum value can be displaced to regard to the new temperature, regulate then that temperature controller is controlled at new temperature with the temperature with laser or near described new temperature.A feedback loop be can arrange, distortion and the temperature of regulating described laser based on described distortion measurement wherein measured consistently or periodically.The light beam part of active transmission that can be by separating described laser or dispose described feedback loop by a distortion detector being inserted in the laser transmission light path scheduled time and then it being removed from light path.
One optical signal transmission system also is provided.One optical module comprises that one produces the light source of optical pulse, and described optical pulse is propagated from the modulated optics signal of described module as one by a photoconduction.When sending described optical signalling by described photoconduction, described light source has a temperature-dependent optical signalling distorted characteristic, and has a minimum value under the optimum temperature of described characteristic in an operating temperature range.The distortion analysis detector is analyzed the distortion of described optical signalling, comprises the distortion of at least a portion of measuring optical signalling or indicates another parameter of described distortion, and produce a diagnostic signal based on described measurement.One control module is determined with planning the temperature that module is adjusted to after the described analysis.The reception one of one temperature controller is determined temperature or approaching described definite temperature from the control signal of described control module so that described module is maintained.According to a plurality of distortion measurements, an approximate definite original optimum temperature also is set the operating temperature of being kept by described temperature controller for treating.
In another embodiment, an optical signal transmission system comprises that also one produces the light source of optical pulse, and described optical pulse is propagated from the modulated optics signal of described module as one by a photoconduction.When sending described optical signalling by described photoconduction, described light source has a temperature-dependent optical signalling distorted characteristic, and have a minimum value under the optimum temperature of described characteristic in an operating temperature range, comprise that one is used to send the light source and the photoconduction of optical signalling.The distortion of distortion analysis detector on-line analysis optical signalling during the active operation of optical signal transmission module of this embodiment, comprise the distortion of a part of measuring optical signalling or indicate another parameter of described distortion, and produce a diagnostic signal based on described measurement.Described control module determines to treat the temperature being kept or be adjusted to by described module according to described analysis.Described temperature controller reception one is determined temperature or approaching described definite temperature from the control signal of described control module so that described module is maintained.According to described distortion measurement, approximate definite one or more optimum temperatures also are set the operating temperature of being kept often during the active operation of described module by described temperature controller for treating.
Description of drawings
Fig. 1 illustrates schematically that with the square frame form one determines that there is the layout of the temperature of distortion minimum value in specific laser transmitting set system.
Fig. 2 is for carrying out a flow chart of technology of distortion minimum value temperature that is used for determining the laser transmitting set system of Fig. 1.
Fig. 3 illustrates a typical distortion of a laser transmitting set system and the relation curve of temperature, and it can (for example) use the technology of Fig. 2 to determine according to a preferred embodiment.
Fig. 4 schematically illustrates with the square frame form and is used for the temperature that has the distortion minimum value is regulated in the distortion of on-line monitoring laser with selectivity feedback arrangement.
Embodiment
Be used for determining that with square frame formal specification one there is the exemplary arrangements of the temperature of distortion minimum value in an optical transmitter among Fig. 1.Module 2 shows to have an electricity end 4 and one optical side 6.Cable 8 holds 4 places to be couple to module 2 at electricity, and fiber optic cables 10 are couple to module 2 at optical side 6 places.Described module comprises the light source 12 based on electrical input signal transmitting optics signal.By described light source being placed in very near the optical medium such as fiber optic cables that will direct into through the optical signalling of emission between optical side 6 and/or light source 12 by a photoconduction being provided in described module 2 and the optical side 6 in the shell.Also schematically show an electrical to optical converter module 14 among Fig. 2.
The optical transmitter module 2 of Fig. 1 also is illustrated as and comprises a temperature sensor (TS) 16 and a temperature controller (TC) 18.Described temperature sensor 16 can be a part or a stand-alone assembly of described temperature controller 18.Described temperature controller 18 comprises a heating and/or a cooling element, as thermoelectric-cooled agent (TEC), current or as another hot-fluid mechanism that the those skilled in the art understood.The distortion analyzer 20 of the another location that is couple to optical medium 10 also is described among Fig. 1.Described distortion analyzer 20 receives from the light source 12 of module 2 and sends to the optical medium 10 and pass the optical signalling of described optical medium 10.Described distortion analyzer 20 can comprise other measuring equipment of the quantity or the parameter of a wattmeter, optical spectrum analyser or measuring light signal, can or analyze the curve of a plurality of data points or a distorted characteristic is determined in its distortion by point by point method based on described measurement.Described temperature controller optionally is set at different temperatures in the temperature range around the distortion minimum value.When described module was operated under each a plurality of temperature or scanned, distortion analyzer was measured its light signal that receives so that distortion at each temperature is determined.Can determine to take place the temperature of minimum distortion from the relation curve of a plurality of distortions and temperature data points.
Fig. 2 carries out one for explanation and is used for determining the step of technology of temperature of laser transmitting set system generation minimum distortion of Fig. 1 or the flow chart of operation.At S1, the temperature controller 18 through assembly system of Fig. 1 is set at first temperature T 1 at the boundary of the temperature range that comprises the temperature that minimum distortion takes place.This temperature range is preferably corresponding to the generation of the optical radiation in the single-mode.When module during, receive described signal at the distortion analyzer place, measure and determine distortion by the optical signalling that system sent of Fig. 1 at S2 in first temperature T 1 time operation.
At S3, then on the direction of distortion minimum temperature, described temperature step entered second temperature T 2 or in the described temperature of second temperature T, 2 interscans.At S4, determine described distortion 2 times in this second temperature T.Repeat the stepping or the scanning of distortion the 3rd, under the fourth class temperature and determine as the indicated step of the S5 among Fig. 2 or operating instruction, all increase and the distortion strong point is considered to be in temperature in the scope that comprises the temperature that the minimum value in the distortion takes place up to described temperature range.
At S6, analyze a plurality of data points and be determined so that the temperature of distortion minimum value takes place.Because this is a kind of manufacture method, thus the design temperature controller with the temperature maintenance of module 2 at about predetermined temperature.In this way, the temperature of controlling described module to be changing around a central temperature, and described central temperature is promptly through determining the temperature with the minimum value in the relation curve of the distortion that produces this particular laser or LED transmitter module 2 and temperature.
Fig. 3 illustrates the distortion of a specific transmitter module and the relation curve of temperature.Should be appreciated that the common displaying of transmitter module is similar to the curve shown in Fig. 3.Yet as indication, the minimum value of transmitter module will change.Boundary in described temperature range shows two temperature T 1 and T2.In a preferred method, under the temperature between T1 and the T2, determine distortion.Shown in curve can be based on neighboring data point by determining from described data with smooth connecting line linking number strong point.As long as take enough data points, just can distinguish minimum distortion, and can determine to take place the temperature of described minimum distortion from described data.At last, the temperature controller (TC) 18 (referring to Fig. 1) of transmitter module 2 can be set at the predetermined temperature T that measures the distortion minimum value and/or determine its generation in addition
Min
In another embodiment of the present invention, the layout that can during an online distortion monitor procedure, use Fig. 1 to schematically illustrate.For example when signal quality deteriorates surpasses a certain limit, temporary transient (periodically or in seclected time), off-line was taked an active communication process, so that described distortion analyzer 20 can insert in the light path of laser transmission.Can be as mentioned or repeat the process of in comprising the whole temperature range of distortion minimum value stepping or scanning similarly.With regard to the optimum temperature that has the distortion minimum value has changed, described temperature controller optionally can be adjusted to described new temperature.After monitoring, remove distortion analyzer, and return to communication process online and continuation.
Though do not show among Fig. 1 that configurable described layout makes described distortion analyzer directly communicate by letter with temperature controller or communicate by letter with a controller module.Preferably handle the result of distortion monitoring at described controller module.Determine optimum temperature, and transmit a signal temperature controller is adjusted to an original or new optimum temperature when being provided with at present when described optimum temperature is different from one.
Fig. 4 is the substitute of key diagram 1 embodiment and the feedback arrangement of just having been discussed schematically.Fig. 4 illustrates a feedback arrangement at line method that can be used for carrying out a monitoring distortion and optimum temperature is regulated and is controlled at distortion minimum value or approaching described distortion minimum value.The layout of Fig. 4 comprises transport module 2, and described transport module 2 comprises electrical input 4 and the optics output 6 that is respectively applied for reception electricity input transmission 8 and sends optical signalling 10.Module 2 preferably includes a laser, LED or other optical light source 12, electrooptic conversion module 14, temperature sensor 16 and temperature controller 18.Input signal 8 can be radio-type, optical type or as other pattern that the those skilled in the art understood, and power supply 8 can alternative be supplied.Understand as the those skilled in the art, laser 12 can optics, electricity or alternate manner come pump to give.
One beam splitter 22 is placed in the light path of laser transmission signal is divided into two parts.In a communication process, the portion in described two parts is directed to or continues to be directed to a receiver.Another part is sent to distortion analyzer 20.In this way, described communication process can continue to keep online and send signal from optical communication module 2 on one's own initiative, and the distortion of analyzing the laser transmission signal simultaneously obtains.Preferably a signal is sent to control module (CM) 24 from described distortion analyzer.Its inside can be separated or embed to described control module 24 with optical communication module 2.Control module 24 is preferably based on described signal or determines from distortion analyzer 20 received signals whether described temperature is in optimum temperature.When determining that operation and/or design temperature are different from described optimum temperature, control module 24 with a signal communication to the temperature of temperature controller 18 with adjusting laser module 2.
There are a lot of alternative arrangements that may and can be favourable.For example, can periodically measure described distortion at one or more temperature spots of the either side of design temperature.As long as the distortion under these temperature is kept above the distortion under the optimum temperature, just need not regulate.When one in these " outside " temperature amount distortion of measuring down during less than the amount distortion under optimum temperature, measured, then can in a process, take further to measure to determine new optimum temperature, maybe new optimum temperature can be changed into the temperature of measurement than low distortion, the point around new optimum temperature continues to measure the same process of distortion thereafter.In another example, stop or during the downtime, can scan or the whole temperature range through extending of stepping makes that can make irregular optimum temperature at suitable time determines in the optical communication process that can arrange or take place in addition for other purpose.
Though described and exemplary graphic and specific embodiment of the present invention be described, should be appreciated that scope of the present invention is not restricted to the specific embodiment of being discussed.Therefore, described embodiment should be considered as illustrative and not restrictive, and should be appreciated that the technical staff in described field can change described embodiment under the situation that does not break away from the scope of the invention of being stated in structural and the functional equivalents as enclose claims and its.
In addition, can be according to the present invention and/or its preferred embodiment carry out and can be described in above or be provided in to describe or provide in addition described operation with selected print order in hereinafter the method.Yet, except knowing that statement one particular order or those skilled in the art can think that a particular order is necessary the part, the selected and so ordering of described sequence in order to print convenient, and it does not wish to hint any particular order of carrying out described operation.
Claims (11)
1. method of making an optical transmitter, described optical transmitter comprises that one is used to produce a laser that is coupled to optical fiber and the modulated optics signal by described optical fiber transmission, wherein said laser has a temperature-dependent optical signalling distorted characteristic at its output, described characteristic has a minimum value in the operating temperature range between one first predetermined temperature and one second higher predetermined temperature, described temperature is defined by the described laser that produces light radiation when being lower than described first temperature and be higher than operation under the temperature of described second temperature under a different mode, and it comprises:
One laser equipment is assemblied in one to be comprised on the module of a temperature sensor and a temperature controller;
The described optimum operating temperature of determining described laser is to minimize the distortion under the temperature between described first temperature and described second temperature; With
Optionally regulate described temperature controller with the described laser of operation under described optimum temperature.
2. method according to claim 1 is wherein saidly determined to comprise: by regulating described temperature controller described temperature is set at a plurality of selected temperatures between described first and second temperature; Determine the described distortion under each temperature; And determine described minimum distortion value based on the data between described distortion and the temperature.
3. method according to claim 1, wherein said assembling comprises an optical fiber end that a primary importance of fiber optic cables is couple to described module, with with the coupling light in the described fiber optic cables of described laser emission, and wherein saidly determine to comprise the described distortion of settling a light meter to be used for analyzing the light that detects at a second place place of described optical fiber cable.
4. method according to claim 1, it further is included in the active transmission manipulate one distortion-Temperature Feedback loop of described laser, and it comprises that the described temperature that repeats to determine described distortion and regulate described laser is roughly to minimize described distortion.
5. method according to claim 1, it further comprises:
Produce one approaching between described first and second temperature and become the described laser of operation under the controlled temperature of temperature of minimum distortion value with temperature; Monitor the described distortion of a laser transmission signal of described laser; With
Optionally regulate described temperature controller based on described monitoring, more to approach to produce the described laser of operation under the new controlled temperature of temperature of described temperature-dependent minimum distortion value one to described distortion.
6. optical signal transmission system, it comprises:
One comprises the optical signal transmission module of a light source;
One photoconduction, the light pulse that is produced by described light source in described photoconduction is propagated from the modulated optics signal of described module as one, wherein said light source is configured to produce a modulated optics signal that is coupled to described photoconduction and sends by described photoconduction, and wherein said light source has the temperature-dependent optical signalling distorted characteristic that has a minimum value under the optimum temperature in an operating temperature range;
One is used to analyze the distortion analysis detector of the distortion of described optical signalling, and it comprises a distortion of at least a portion of measuring described optical signalling or indicates another parameter of described distortion and produce a diagnostic signal based on described measurement;
One control module, it is used for determining with planning the temperature that described module is adjusted to after the described analysis; With
One temperature controller, its be used to receive one from the control signal of described control module described module is maintained described predetermined temperature or near described predetermined temperature, wherein according to a plurality of distortion measurements, determining an original optimum temperature approx and being set is to treat the operating temperature kept by described temperature controller.
7. system according to claim 6, optical signalling distortion during the signal of wherein said distortion analysis detector is coupled to described control module and is configured to the described optical signal transmission module operation of on-line analysis, and wherein said control module determines whether based on a signal from described distortion analysis detector will be with described module temperature maintenance in described original optimum temperature, or is adjusted to it under present optimum temperature or a new temperature of more approaching described present optimum temperature.
8. system according to claim 7 wherein repeats described analysis repeatedly and determines, and with the described temperature maintenance of described module or be adjusted to definite temperature.
9. system according to claim 6, wherein said module further comprise an electric signal connector and an electro-optical signal converter module.
10. system according to claim 6, wherein according to described distortion measurement, dispose described system to determine one or more optimum temperatures approx and to be set operating temperature for treating during when the described active operation of described module to keep by described temperature controller.
11. system according to claim 10, if wherein described system be further configured based on one programmed events increase automatically during operation or reduce or both increased and also reduce a temperature, under each temperature, measure distortion so, and determine whether to keep or regulate described module temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/946,056 US7412174B2 (en) | 2004-05-05 | 2004-09-21 | Method and apparatus for distortion control for optical transmitters |
| US10/946,056 | 2004-09-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1753334A true CN1753334A (en) | 2006-03-29 |
| CN1753334B CN1753334B (en) | 2011-11-09 |
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| CN200510103273XA Expired - Fee Related CN1753334B (en) | 2004-09-21 | 2005-09-20 | Method and apparatus for distortion control for optical transmitters |
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| Country | Link |
|---|---|
| JP (1) | JP4806559B2 (en) |
| KR (1) | KR101057826B1 (en) |
| CN (1) | CN1753334B (en) |
| TW (1) | TWI330474B (en) |
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| CN101136537B (en) * | 2006-08-31 | 2010-12-15 | 日本电气株式会社 | Wavelength variable laser |
| CN103891066A (en) * | 2011-10-17 | 2014-06-25 | 华为技术有限公司 | Self-characterization tunable optical network unit |
| CN113395115A (en) * | 2020-03-11 | 2021-09-14 | 华为技术有限公司 | Radio over fiber communication system and nonlinear compensation method |
| CN113741584A (en) * | 2021-09-08 | 2021-12-03 | 中国兵器装备集团自动化研究所有限公司 | Display screen and smear control method and device thereof |
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| JP5474515B2 (en) * | 2009-12-10 | 2014-04-16 | 株式会社プランナーズランド | Visible light communication transmitter |
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| US7079775B2 (en) * | 2001-02-05 | 2006-07-18 | Finisar Corporation | Integrated memory mapped controller circuit for fiber optics transceiver |
| US6538789B2 (en) * | 2001-04-03 | 2003-03-25 | Lightwave Solutions, Inc. | Optical linearizer for fiber communications |
| JP2002317451A (en) * | 2001-04-23 | 2002-10-31 | Dai Ichi High Frequency Co Ltd | Optical fiber stretching system for observation of ground deformation |
| JP2003298180A (en) * | 2002-03-29 | 2003-10-17 | Fuji Photo Film Co Ltd | Semiconductor laser driving unit |
| JP2004207666A (en) * | 2002-04-16 | 2004-07-22 | Hitachi Kokusai Electric Inc | Laser-diode module, laser-diode apparatus, and optical transmitter |
| US7170914B2 (en) * | 2003-06-27 | 2007-01-30 | Intel Corporation | Optical transmitters |
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| US7466925B2 (en) * | 2004-03-19 | 2008-12-16 | Emcore Corporation | Directly modulated laser optical transmission system |
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- 2005-09-16 TW TW094131951A patent/TWI330474B/en not_active IP Right Cessation
- 2005-09-20 CN CN200510103273XA patent/CN1753334B/en not_active Expired - Fee Related
- 2005-09-21 JP JP2005306345A patent/JP4806559B2/en not_active Expired - Fee Related
- 2005-09-21 KR KR1020050087897A patent/KR101057826B1/en not_active IP Right Cessation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101136537B (en) * | 2006-08-31 | 2010-12-15 | 日本电气株式会社 | Wavelength variable laser |
| CN103891066A (en) * | 2011-10-17 | 2014-06-25 | 华为技术有限公司 | Self-characterization tunable optical network unit |
| CN103891066B (en) * | 2011-10-17 | 2016-12-28 | 华为技术有限公司 | Tunable optical NE |
| CN113395115A (en) * | 2020-03-11 | 2021-09-14 | 华为技术有限公司 | Radio over fiber communication system and nonlinear compensation method |
| WO2021179879A1 (en) * | 2020-03-11 | 2021-09-16 | 华为技术有限公司 | Radio over fiber system and nonlinear compensation method |
| CN113395115B (en) * | 2020-03-11 | 2022-12-27 | 华为技术有限公司 | Radio over fiber communication system and nonlinear compensation method |
| CN113741584A (en) * | 2021-09-08 | 2021-12-03 | 中国兵器装备集团自动化研究所有限公司 | Display screen and smear control method and device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006115524A (en) | 2006-04-27 |
| JP4806559B2 (en) | 2011-11-02 |
| CN1753334B (en) | 2011-11-09 |
| TWI330474B (en) | 2010-09-11 |
| KR20060051503A (en) | 2006-05-19 |
| KR101057826B1 (en) | 2011-08-19 |
| TW200624977A (en) | 2006-07-16 |
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