CN111865426B - Spectrum alignment method and device, transmitter and optical network system - Google Patents
Spectrum alignment method and device, transmitter and optical network system Download PDFInfo
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- CN111865426B CN111865426B CN202010701309.9A CN202010701309A CN111865426B CN 111865426 B CN111865426 B CN 111865426B CN 202010701309 A CN202010701309 A CN 202010701309A CN 111865426 B CN111865426 B CN 111865426B
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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
- 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
- H04B10/40—Transceivers
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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
- H04B10/564—Power control
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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
- H04B10/572—Wavelength control
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Abstract
The embodiment of the application provides a method and a device for aligning a spectrum, a transmitter and an optical network system, wherein the device comprises: a temperature monitoring unit configured to detect a temperature change amount of one of the laser and the filter; a control unit configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation; a temperature adjustment unit configured to adjust a temperature of the laser or adjust a temperature of the filter unit according to the temperature adjustment value; when the temperature monitoring unit is used for monitoring the temperature variation of the laser, the temperature adjusting value is used for adjusting the temperature of the filter; and when the temperature monitoring unit is used for monitoring the temperature variation of the filter, the temperature adjusting value is used for adjusting the temperature of the laser. The embodiment of the application realizes the spectrum alignment of the laser and the spectrum shaping unit on the basis of improving the system integration level.
Description
Technical Field
The present application relates to the field of optical communications, and in particular, to a method and an apparatus for spectrum alignment, a transmitter, and an optical network system.
Background
An existing Direct Modulated Laser (DML) cannot perform long-distance transmission due to Chirp influence, and a Chirp Management Laser (CML) is added with an Optical Spectrum modulator (OSR) on the basis of the DML, and the OSR filters a Spectrum output by the DML to filter a part of Chirp effects, where the filtered Chirp effects mainly refer to adiabatic Chirp generated when the DML modulates 1bit and 0bit respectively, and outputs different Optical wavelengths respectively, and the spectral modulator filters 0bit light to remove adiabatic Chirp, and can improve extinction ratio.
Because the magnitude of the adiabatic chirp is influenced by the bias current of the input current and the modulation current of the directly modulated laser to generate different adiabatic chirps, the corresponding relation between the laser spectrum and the filtering spectrum of the spectrum shaping element is adjusted to directly influence the output effect of the chirp management laser, namely the spectrum of bit 0 is filtered as much as possible, and the spectrum of bit 1 is reserved, so that the chirp management laser achieves the optimal output performance.
Therefore, how to improve the alignment relationship between the laser of the chirp management laser and the spectrum shaping element is a technical problem to be solved urgently.
Disclosure of Invention
An object of the embodiments of the present application is to provide a spectrum alignment method, a spectrum alignment device, a transmitter, and an optical network system, where the embodiments of the present application can adjust the temperature of a laser according to the temperature drift coefficient of the laser, the temperature drift coefficient relationship of an OSR, and a detected change in the OSR temperature, so that on one hand, alignment between the laser and a spectrum shaping element can be achieved, and on the other hand, the technical purpose of alignment can be achieved only by adjusting the temperature of the laser, and the integration level of the device is improved compared with the prior art. In addition, the embodiment of the application also provides a method for calibrating the initial optimal value of the CML.
In a first aspect, an embodiment of the present application provides a device for spectral alignment, the device comprising: a temperature monitoring unit configured to monitor a temperature variation amount of the filter; a control unit configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation; a temperature adjustment unit configured to adjust a temperature of the laser according to the temperature adjustment value.
The embodiment of the application realizes the spectrum alignment of the laser and the spectrum shaping unit OSR on the basis of improving the system integration level. For example, for the situation that the absolute wavelength of the laser is not required, the embodiment of the application can realize the alignment of the relative wavelength by detecting the variation of the temperature of one of the laser or the filter and by using a temperature adjusting unit, and the technical scheme is simpler and more practical.
In some embodiments, the control unit is further configured to: determining the temperature adjustment value according to a temperature coefficient of the laser, a temperature coefficient of the filter, and the temperature change amount.
The embodiment of the application provides a technical scheme for determining a temperature adjustment value according to a temperature coefficient, so that the temperature of the rest of the laser or the OSR can be determined by monitoring the temperature change of the laser or the OSR, the technical implementation scheme is simpler, the number of temperature adjustment units is reduced, and the equipment integration level is increased.
In some embodiments, the apparatus further comprises: a temperature feedback unit configured to feed back a temperature adjustment result to the control unit, wherein the control unit is further configured to judge that the temperature adjustment process is ended according to the temperature adjustment result.
The embodiment of the application can monitor whether the temperature adjusting process is finished at any time, conveniently and immediately stop adjusting when the temperature adjusting process is ended, and ensure the spectrum alignment of the laser and the filter.
In a second aspect, embodiments of the present application provide a spectral alignment method applied to a chirp management laser including a laser and a filter, the method including: acquiring a temperature variation, wherein the temperature variation is the temperature variation of the filter; determining a temperature adjustment value according to the temperature variation to adjust the temperature of the laser; and adjusting the temperature of the laser or the temperature of the filter according to the temperature adjusting value.
In some embodiments, the determining a temperature adjustment value according to the temperature change amount includes: determining the temperature adjustment value according to a temperature coefficient of the laser, a temperature coefficient of the filter, and the temperature change amount.
In some embodiments, the method further comprises: and receiving the fed back temperature value to judge whether the temperature adjusting process according to the temperature adjusting value is finished or not.
In some embodiments, before obtaining the temperature variation, the method further comprises: an initial lock value is determined based on the extinction ratio and the eye pattern template.
In some embodiments, the determining an initial lock value from the extinction ratio and the eye pattern mask comprises: setting a bias current, a radio frequency amplitude current and a die temperature of the laser; determining that the extinction ratio is greater than a first target value; determining that the optical power is greater than a second target value; and if the output eye pattern is determined to meet the condition according to the eye pattern template, storing the bias current, the radio frequency amplitude current, the tube core temperature of the laser and the driving current of the laser.
In a third aspect, an embodiment of the present application provides a transmitter, including: a laser, a filter and a spectrally aligned arrangement as described above in relation to the first aspect.
In a fourth aspect, an embodiment of the present application provides a transceiver, including: a laser, a detector, a filter and a spectrally aligned apparatus as described above in relation to the first aspect.
In a fifth aspect, an embodiment of the present application provides an optical network system, where the optical network system includes an optical line terminal and an optical network unit, where the optical line terminal and/or the optical network unit at least includes the transmitter according to the third aspect.
In a sixth aspect, an embodiment of the present application provides an optical network system, where the optical network system includes an optical line terminal and an optical network unit, where the optical line terminal and/or the optical network unit at least includes the transceiver of the fourth aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a block diagram of a device transmitter including spectral alignment according to an embodiment of the present disclosure;
FIG. 2 is a block diagram of another apparatus transmitter including spectral alignment according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a spectral alignment method provided by an embodiment of the present application;
FIG. 4 is a test connection diagram of a test system according to an embodiment of the present application;
FIG. 5 is a flowchart of a method for locking an initial value according to an embodiment of the present disclosure;
fig. 6 is a block diagram of an optical network system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The embodiment of the present application provides a device for spectrum alignment, the device includes: a temperature monitoring unit configured to monitor a temperature variation amount of the filter; a control unit configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation; a temperature adjustment unit configured to adjust a temperature of the laser in accordance with the temperature adjustment value.
Referring to fig. 1, fig. 1 is a block diagram of a transmitter including a spectral alignment apparatus 10 according to an embodiment of the present disclosure. The transmitter of fig. 1 includes: a laser driving unit 600 (for receiving input electrical data), a directly modulated laser 300 (for deriving a modulated optical signal from input information), a filter OSR400 (for deriving a spectrally shaped signal from an input optical signal), and a spectral alignment apparatus 10.
The spectral alignment apparatus 10 of the present embodiment may include at least two examples.
In one example, as shown in fig. 1, the alignment apparatus 10 includes a temperature adjustment unit 500 connected to the direct modulation laser 300, a temperature monitoring unit 100 connected to the filter OSR, and a control unit 200 connected to the temperature monitoring unit 100 and the temperature adjustment unit 500. Wherein the temperature monitoring unit 100 is configured to detect a temperature variation amount of the filter OSR of fig. 1; a control unit 200 configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation; a temperature adjustment unit 500 configured to adjust the temperature of the directly modulated laser 300 in accordance with the temperature adjustment value. For example, the temperature adjustment value is determined according to a temperature coefficient of the laser, a temperature coefficient of the filter, and the temperature change amount.
It should be noted that, in order to further confirm whether the temperature adjustment process is finished, the embodiment of the present application may use the temperature feedback unit to perform control in a closed-loop feedback mode. That is, when the temperature adjustment value obtained by the control unit 200 is used for adjusting the temperature of the laser, the temperature feedback unit is connected with the laser to obtain the temperature of the laser; wherein the control unit 200 is further configured to determine that the temperature adjustment process is finished according to the temperature adjustment result.
As an example, as shown in fig. 1, the spectrum alignment apparatus 10 of the embodiment of the present application includes a temperature adjustment unit 500 and a temperature feedback unit 800 connected to the directly modulated laser 300, a temperature monitoring unit 100 connected to the filter OSR400, and a control unit 200 connected to the temperature monitoring unit 100 and the temperature adjustment unit 500. Wherein the temperature monitoring unit 100 is configured to monitor a temperature variation amount of the filter OSR400 of fig. 1; a control unit 200 configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation; a temperature adjusting unit 500 configured to adjust a temperature of the direct modulation laser 300 according to the temperature adjustment value; a temperature feedback unit 800 configured to feed back a temperature adjustment result for the directly modulated laser 300 to the control unit 200.
Whether the temperature adjustment process is finished or not can be monitored at any time through the temperature feedback unit and the control unit, the adjustment can be stopped immediately when the temperature adjustment process is finished, and the spectrum alignment of the laser and the filter is guaranteed.
It should be noted that, as shown in fig. 1, the alignment apparatus 10 according to the embodiment of the present application may further include a plurality of analog-to-digital conversion units 700, and specifically may include a first analog-to-digital conversion unit 700 and a second analog-to-digital conversion unit 700 of fig. 1, where the analog-to-digital conversion unit 700 is configured to convert an analog signal received into a digital signal and input the digital signal to the control unit 200.
The structure of the transmitter of an embodiment of the present application and an exemplary structure of the alignment apparatus 10 it comprises (the alignment apparatus 10 is not marked with a frame line in fig. 2) are further illustrated in connection with fig. 2.
Unlike fig. 1, the temperature feedback unit 800 and the temperature monitoring unit 100 of the transmitter according to the embodiment of the present application may employ thermistors, for example, a first thermistor and a second thermistor of fig. 2. In the example of fig. 2, the temperature adjustment unit 500 includes a temperature driving unit 510 and a TEC 520. The directly modulated laser 300 and the temperature feedback unit 800 of fig. 2 (e.g., the temperature feedback unit 800 of fig. 2 is a first thermistor) are both located above the TEC 520. The second thermal area resistance and OSR of fig. 2 are located on top of the base of the heatsink. In conjunction with the above, the first thermistor in the example of fig. 2 is used to perform the function of the temperature feedback unit, i.e., to feed back the temperature of the DML to the control unit so that the control unit determines whether the temperature adjustment process for the DML is finished; the second thermistor corresponding to the temperature monitoring unit 100 in the example of fig. 2 is used to perform temperature monitoring, i.e., monitor the temperature variation of the OSR, and the control unit 200 receives the temperature variation to adjust the temperature of the DML through the TEC520 and the temperature driving unit 510.
The transmitter of fig. 2 comprises three analog-to-digital conversion units, namely a first analog-to-digital conversion unit, a second analog-to-digital conversion unit and a third analog-to-digital conversion unit of fig. 2, which are all used for performing an analog-to-digital conversion function and sending the converted digital signal to the control unit 200, so that the control unit 200 performs operations related to spectral alignment. The first analog-to-digital conversion unit 700 is connected to the first thermistor, the second analog-to-digital conversion unit 700 is connected to the second thermistor, and the third analog-to-digital conversion unit is connected to the PD 1330. Fig. 2 also includes a first lens 310, an isolator 320, and a second lens 410.
The method of spectral alignment is exemplarily set forth below in connection with fig. 3.
As shown in fig. 3, an embodiment of the present application provides a spectral alignment method, including: s101, acquiring temperature variation, wherein the temperature variation is the temperature variation of a laser; s102, determining a temperature adjustment value according to the temperature variation to adjust the temperature of the laser; s103, adjusting the temperature of the laser according to the temperature adjusting value.
To calculate the temperature adjustment value, S102 may include, as one example: determining the temperature adjustment value according to a temperature coefficient of the laser, a temperature coefficient of the filter, and the temperature change amount. Specifically, when the temperature of the OSR changes, the filtered spectrum of the OSR may drift, and when the temperature variation of the OSR is Z degrees, the filtered spectrum of the OSR drifts by a factor a nm/c and a factor B nm/c of the laser (for example, the direct modulation laser 300 in fig. 1 or fig. 2), the laser needs to adjust (a × Z)/B ℃ (i.e., the temperature adjustment is calculated), and after the adjustment, the laser and the OSR still maintain the previous spectrum corresponding relationship.
In some embodiments, the method further comprises: and receiving the fed back temperature value to judge whether the temperature adjusting process according to the temperature adjusting value is finished or not.
In combination with the above, in the embodiment of the present application, only the laser may be controlled by temperature to adjust the corresponding relationship between the laser spectrum and the OSR filtering spectrum, so as to maintain the optimal state. The embodiment of the application can also start automatic locking after the initial locking value is calibrated through the test system. Where OSR does not add TEC, only a temperature monitoring unit (e.g., a thermistor) is added to monitor OSR temperature.
The test system is composed as shown in fig. 4, and the connection diagram of the test system includes an error detector 401, a chirp management laser CML (the chirp management laser includes the above-mentioned directly modulated laser, filter OSR and alignment device 10 in fig. 1 or fig. 2), an optical switch 402, and an eye diagram 403 and an optical power meter 404 connected to the optical switch 402, which are connected in sequence.
That is to say, the spectrum alignment method of the embodiment of the present application, before acquiring the temperature variation, further includes: an initial lock value is determined based on the extinction ratio and the eye pattern template. For example, the determining the initial lock value according to the extinction ratio and the eye pattern template may include: setting a bias current, a radio frequency amplitude current and a die temperature of the laser; determining that the extinction ratio is greater than a first target value; determining that the optical power is greater than a second target value; and if the output eye pattern is determined to meet the condition according to the eye pattern template, storing the bias current, the radio frequency amplitude current, the tube core temperature of the laser and the driving current of the laser. The process of locking the initial value is illustrated below in connection with fig. 5.
As can be seen from fig. 5, the locking process of the initial lock value of the embodiment of the present application includes: s201, setting laser bias current; s202, setting the radio frequency amplitude current of the laser; s203, adjusting the temperature of the laser tube core; s204, judging whether the extinction ratio ER is larger than a first target value, and if so, continuing to execute S203; and when the ER is larger than the first target value, executing the judgment of S205 to judge whether the optical power is larger than a second target value, returning to S201 when the optical power is not larger than the second target value, otherwise executing S206, comparing the eye pattern of the CML output signal detected by the eye pattern instrument with an eye pattern template existing in the eye pattern instrument, and if the eye pattern requirement is met, executing S207 to record the current parameter (recording the control temperature of the laser die of the laser bias current laser radio frequency amplitude current laser in the current CML), otherwise executing S208 to adjust the pre-emphasis of the driver of the CML laser.
As shown in fig. 1, an embodiment of the present application provides a transmitter, including: a laser (e.g., the directly modulated laser 300 of fig. 1), a filter (e.g., the filter OSR of fig. 1), and the spectral alignment apparatus 10 of fig. 1.
An embodiment of the present application provides a transceiver, including: a laser, a detector, a filter, and the spectrally aligned arrangement described in figure 1.
As shown in fig. 6, an optical network system according to an embodiment of the present application includes an optical line terminal 20 and an optical network unit 30, where the optical line terminal and the optical network unit may be interconnected by an optical fiber. In some examples, the optical line terminal 20 and/or the optical network unit 30 include at least the transmitter described above with respect to fig. 1. In other examples, the optical line terminal 20 and/or the optical network unit 30 include at least the transceivers described above.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An apparatus for spectral alignment, the apparatus comprising:
a temperature monitoring unit configured to monitor a temperature variation amount of the filter;
a control unit configured to receive the temperature variation and determine a temperature adjustment value according to the temperature variation;
a temperature adjustment unit configured to adjust a temperature of the laser according to the temperature adjustment value;
the method for determining the temperature adjustment value comprises the following steps:
the temperature drift coefficient of the filter is A nm/DEG C, the temperature drift coefficient of the laser is B nm/DEG C, and when the temperature variation of the filter is Z degree, the temperature adjustment value required to be adjusted by the laser is (A multiplied by Z)/B ℃.
2. The apparatus of claim 1, wherein the apparatus further comprises:
a temperature feedback unit configured to feed back a temperature adjustment result to the control unit;
the control unit is further configured to determine that the temperature adjustment process is ended according to the temperature adjustment result.
3. A spectral alignment method for a chirp management laser including a laser and a filter, the method comprising:
acquiring a temperature variation, wherein the temperature variation is the temperature variation of the filter;
determining a temperature adjustment value according to the temperature variation to adjust the temperature of the laser;
adjusting the temperature of the laser according to the temperature adjusting value;
the method for determining the temperature adjustment value comprises the following steps:
the temperature drift coefficient of the filter is A nm/DEG C, the temperature drift coefficient of the laser is B nm/DEG C, and when the temperature variation of the filter is Z degree, the temperature adjustment value required to be adjusted by the laser is (A multiplied by Z)/B ℃.
4. The method of claim 3, wherein the method further comprises: and receiving the fed back temperature value to judge whether the temperature adjusting process according to the temperature adjusting value is finished or not.
5. The method for spectral alignment of claim 3, wherein prior to said obtaining the amount of temperature change, said method further comprises: an initial lock value is determined based on the extinction ratio and the eye pattern template.
6. The method for spectral alignment of claim 5, wherein said determining an initial lock value from the extinction ratio and the eye pattern template comprises:
setting a bias current, a radio frequency amplitude current and a die temperature of the laser;
determining that the extinction ratio of the output optical signal of the filter is greater than a first target value;
determining that the optical power of the optical signal output by the filter is greater than a second target value;
and if the output eye pattern is determined to meet the condition according to the eye pattern template, storing the bias current, the radio frequency amplitude current, the tube core temperature of the laser and the driving current of the laser.
7. A transmitter, characterized in that the transmitter comprises: a laser, a filter, and the spectrally aligned arrangement of any one of claims 1-2.
8. A transceiver, characterized in that the transceiver comprises: a laser, a detector, a filter, and the spectrally aligned arrangement of any one of claims 1-2.
9. An optical network system, characterized in that the optical network system comprises an optical line terminal and an optical network unit, wherein the optical line terminal and/or the optical network unit comprises at least a transmitter according to claim 7.
10. An optical network system, characterized in that the optical network system comprises an optical line terminal and an optical network unit, wherein the optical line terminal and/or the optical network unit comprises at least a transceiver according to claim 8.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1371539A (en) * | 1999-08-31 | 2002-09-25 | 康宁股份有限公司 | Wavelength-locked external cavity lasers with integrated modulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4505403B2 (en) * | 2005-11-15 | 2010-07-21 | 富士通株式会社 | Optical transmitter |
| CN101465515B (en) * | 2008-12-26 | 2010-12-01 | 中兴通讯股份有限公司 | Debugging apparatus and method based on chirp management laser |
| US8559821B2 (en) * | 2009-12-02 | 2013-10-15 | Futurewei Technologies, Inc. | Wavelength stabilization and locking for colorless dense wavelength division multiplexing transmitters |
| CN103311802A (en) * | 2013-05-31 | 2013-09-18 | 华为技术有限公司 | Wavelength-tunable laser output method and tunable laser device |
| CN103703700B (en) * | 2013-07-15 | 2016-09-28 | 华为技术有限公司 | Method, device and the optical network system of a kind of wavelength alignment |
| CN105634614B (en) * | 2014-10-30 | 2018-06-05 | 华为技术有限公司 | Optical sender, wavelength alignment methods and passive optical network |
| CN106785882B (en) * | 2016-11-30 | 2020-07-28 | 武汉光迅科技股份有限公司 | High-power double-port output silicon-based tunable external cavity laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1371539A (en) * | 1999-08-31 | 2002-09-25 | 康宁股份有限公司 | Wavelength-locked external cavity lasers with integrated modulator |
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