CN101944705B - Working method for DFB laser-based XFP optical module for transmission - Google Patents
Working method for DFB laser-based XFP optical module for transmission Download PDFInfo
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Abstract
The invention discloses a method and optimization for adjusting an XFP optical module which adopts a distributed feedback (DFB) semiconductor laser by the gradual change of a digital potentiometer DAC and making the XFP optical module work at the best working point. The method and the optimization are suitable for a high-speed low-power consumption long-distance transmission optical fiber communication system; a microcontroller adjusts an APC control circuit through lookup tables (LUTs) to compensate bias current Ibias so as to make the set output light power of the DFB laser component the set output light power value which corresponds to the temperature range, and stabilizes the temperature of the DFB laser within the set output light power range through the APC control circuit; and the invention discloses a method for testing through two LUTs and three temperature points, and makes the XFP optical module which adopts the distributed feedback (DFB) semiconductor laser work under the best condition.
Description
Technical field
The present invention relates to the electrooptical device field in fiber data communication and the telecom communication, particularly the long Distance Transmission XFP optical module of high-speed low-power-consumption.
Background technology
As the core devices of fiber optic communication network, optical module has promoted the main line optical transmission system to low cost, large capacity, and the future development of low-power consumption, rationally volume is more and more less so that the configuration of optical-fiber network is more complete, and the interface density that interface board comprises is more and more higher.Optical module is by opto-electronic device, the structural member such as functional circuit and optic electric interface forms, opto-electronic device comprises and transmits and receives two parts: for different application, radiating portion comprises LED, VCSEL, FP, DFB, with several light sources such as EML, receiving unit comprises PIN and two types of photo-detectors of APD.For the high-speed optical module that is used for the long haul optical transmission systems of large capacity and uses, light source need to be taked the EML laser assembly that freezes and the EML laser driver of high power consumption, and like this, the power consumption of whole high-speed optical module is difficult to reduce.In addition, because the power consumption of temperature controller in the market is also very high, especially its efficient is very low under low refrigeration electric current, causes the power consumption of whole optical module further to increase.
So the Distributed Feedback Laser without the refrigeration heating is used for long haul optical transmission systems high-speed optical module, can significantly reduce power consumption.But the laser optical power and the extinction ratio that need to solve under the variations in temperature are stable, and optimization Distributed Feedback Laser operating state (eye pattern mask has maximum allowance).Owing to cancelled refrigeration heating component (TEC circuit), greatly reduce the manufacturing cost of optical module simultaneously.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, provide a kind of and can effectively reduce power consumption, the long Distance Transmission XFP optical module of the high-speed low-power-consumption that while guaranteed performance technical indicator does not reduce.
The long Distance Transmission of high-speed low-power-consumption of the present invention is achieved by following technical proposals with the XFP optical module:
The long Distance Transmission XFP optical module of high-speed low-power-consumption, comprise Distributed Feedback Laser assembly and optical detector component in electrical interface, optical fiber input/output interface, the XFP optical module, also comprise microcontroller and be connected in XFP optical module electrical interface and the Distributed Feedback Laser assembly between low-power consumption DML laser driver module, be used for Driven DF B laser assembly; Adopt EML laser driver module to drive the EML laser assembly in the existing XFP optical module, EML laser driver module produces larger power consumption, adopt low-power consumption DML laser driver module+Distributed Feedback Laser to replace EML laser driver module to drive the EML laser assembly among the present invention, in the hope of reaching the effect that reduces power consumption; Modulate in maximum efficiency the electroabsorption modulator of Distributed Feedback Laser assembly with suitable impedance matching circuit; In the present invention, there is auto light power stabilization control circuit APC described low-power consumption DML laser driver module inside, it is digital-analog convertor that there is DAC(Digital-to-Analog Converter microcontroller inside), there is LUT (Look-Up Table) microcontroller inside.
As a kind of improvement of the present invention, must overcome the inherent shortcoming that the Distributed Feedback Laser device is used for long haul optical transmission systems, also need make following improvement: Distributed Feedback Laser assembly Output optical power is by auto light power stabilization control circuit (APC) control, the Output optical power scope of Distributed Feedback Laser assembly is divided into two and above control interval, setting power value in the corresponding interval of each temperature range, microcontroller is by the linear relationship of the temperature of the corresponding laser of the temperature sampling inside of self, thereby the temperature of detecting laser inside, judge and belong to which temperature range, microcontroller is adjusted the APC control circuit by LUT bias current (Ibias) is compensated, make the Output optical power of setting the Distributed Feedback Laser assembly be setting Output optical power value corresponding to this temperature range, and by the APC control circuit with the Distributed Feedback Laser temperature stabilization in the Output optical power scope that sets.The optimum Working of Distributed Feedback Laser is at normal temperature, use for commerce, want to be operated in-5 degrees centigrade to 70 degrees centigrade, so must be when low temperature corresponding increasing luminous power to optimize eye pattern, the corresponding luminous power that reduces is to guarantee that extinction ratio is stable and to satisfy ITU standard (ITU:INTERNATIONAL TELECOMMUNICATION UNION, i.e. International Telecommunications Union during high temperature; Present patent application relates generally to standard No.: G.691).Original way is under the full temperature condition Output optical power of Distributed Feedback Laser to be set under the value, realizes that by the APC control mode the lower optical output power of laser of full temperature is constant, needs only by extinction ratio is compensated like this.The present invention is set in several temperature such as P1 with optical output power of laser by APC, P2, P3 and three power points all need satisfy ITU standard (ITU is International Telecommunications Union's telecommunication standards group), P2 is the normal temperature Output optical power, P1 is the low temperature Output optical power, P3 is the high temperature Output optical power, and the linking of full temperature realizes by LUT.For 3 power points, need microprocessor that the DAC microcontroller is set extinction ratio is carried out temperature-compensating, the linking of full temperature realizes by LUT; LUT(Look-Up-Table) be exactly in essence a RAM; After data are write RAM in advance, table look-up whenever signal of input just equals to input an address, find out content corresponding to address, then output; LUT (Look-Up Table) in fact is exactly the mapping table of a grey scale pixel value, the conversion that the grey scale pixel value process that it arrives actual samples is certain such as threshold value, counter-rotating, binaryzation, contrast adjustment, linear transformation etc., become the with it gray value of correspondence of another one, can play like this useful information of outstanding image, strengthen the effect of the optical contrast ratio of image.
The long Distance Transmission of high-speed low-power-consumption of the present invention with the XFP optical module compared with prior art has following good effect:
The long Distance Transmission XFP optical module of high-speed low-power-consumption of the present invention is made improvement from many aspects, reduced optical module power consumption, improved the yield of Distributed Feedback Laser for the production of manufacturing, improved to greatest extent laser switching rate (bandwidth).Make without the refrigeration Distributed Feedback Laser to be achieved for the long Distance Transmission of high-speed low-power-consumption, simultaneously through as above optimizing, be fit to very much optical module and make on a large scale production.
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Fig. 1 is structural representation of the present invention.
Embodiment
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
The long Distance Transmission XFP optical module of the high-speed low-power-consumption of present embodiment, as shown in Figure 1, comprise Distributed Feedback Laser assembly and optical detector component in electrical interface, optical fiber input/output interface, the XFP optical module, also comprise the DML laser driver module that is connected between XFP optical module electrical interface and the Distributed Feedback Laser assembly, be used for Driven DF B laser assembly; Also comprise for the microcontroller of realizing the module various functions.
Distributed Feedback Laser assembly Output optical power is by auto light power stabilization control circuit (APC) control, the Output optical power scope of Distributed Feedback Laser assembly is divided into two and above control interval, setting power value in the corresponding interval of each temperature range, microcontroller is by the linear relationship of the temperature of the corresponding laser of the temperature sampling inside of self, thereby the temperature of detecting laser inside, judge and belong to which temperature range, microcontroller is adjusted the APC control circuit by LUT bias current is compensated, make the Output optical power of setting the Distributed Feedback Laser assembly be setting Output optical power value corresponding to this temperature range, and by the APC control circuit with the Distributed Feedback Laser temperature stabilization in the Output optical power scope that sets.
Important enforcement is: according to temperature spot high temperature, and low temperature, normal temperature, 3 points are adjusted average light power and extinction ratio (average light power and extinction ratio interact), make its Distributed Feedback Laser be operated in optimum state, to obtain maximum eye pattern mask allowance.For guaranteeing the full temperature work of Distributed Feedback Laser assembly in the best condition, adopt the present normal temperature of software algorithm place to fix the P2 value, this P2 value is set need to be near ITU standard (ITU:INTERNATIONAL TELECOMMUNICATION UNION, i.e. International Telecommunications Union; Present patent application relates generally to standard No.: the upper limit that G.691) requires writes among the LUT as initial value.Use simultaneously the given normal temperature of software algorithm place's delustring ratio.Again in high temperature place debugging P3 value, take the P2 value as the basis, the compensation extinction ratio, whether if extinction ratio reaches the ITU standard, it is up to standard then to test eye pattern mask, up to standard with regard to P3=P2, if eye pattern mask can not be up to standard, then the upper software algorithm in P2 value basis is whenever successively decreased a step by certain stepping luminous power of successively decreasing, need again to test in order extinction ratio and eye pattern mask, be limited to the desired luminous power lower limit of ITU standard under successively decreasing.Last gained P3 is the high temperature optimal value, writes LUT, gets the P2 linear fit with the normal temperature place again, and software algorithm is given P3 place's delustring ratio simultaneously, with normal temperature extinction ratio linear fit.At last in low temperature place debugging P1 value, take the P2 value as the basis, the compensation extinction ratio, whether up to standard, up to standard with regard to P1=P2 if then testing eye pattern mask, if eye pattern mask can not be up to standard, then the upper software algorithm in P2 value basis is by certain step increments luminous power, whenever increase progressively a step, need again to test in order extinction ratio and eye pattern mask, be limited to the desired luminous power higher limit of ITU standard on increasing progressively.Last gained P1 is the low temperature optimal value, gets the P2 linear fit with the normal temperature place again, and software algorithm is given P1 place's delustring ratio simultaneously, with normal temperature extinction ratio linear fit.Finish above step, the long haul optical transmission systems high-speed optical module take DFB as main devices just is operated in optimum state.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a high-speed low-power-consumption is grown Distance Transmission XFP optical module, comprise Distributed Feedback Laser assembly and optical detector component in electrical interface, optical fiber input/output interface, the XFP optical module, it is characterized in that: also comprise microcontroller and be connected in the aforementioned electric interface of described XFP optical module and the low-power consumption DML laser driver module between the described Distributed Feedback Laser assembly;
Described low-power consumption DML laser driver module is controlled the Output optical power of aforementioned Distributed Feedback Laser assembly by its inner auto light power stabilization control circuit APC, and described microcontroller is adjusted described microcontroller inside by its inner LUT DAC carries out temperature-compensating to modulation electric current I mod;
The Output optical power scope of described Distributed Feedback Laser assembly is divided into two and above control interval, setting power value in the corresponding interval of each temperature range, described microcontroller is by the linear relationship of the temperature of the corresponding described laser of the temperature sampling inside of self, thereby survey the temperature of described laser inside, judge and belong to which temperature range, described microcontroller is adjusted aforementioned APC control circuit by aforementioned LUT bias current Ibias is compensated, make the Output optical power of setting described Distributed Feedback Laser assembly be setting Output optical power value corresponding to this temperature range, and by aforementioned APC control circuit with aforementioned Distributed Feedback Laser temperature stabilization in the Output optical power scope that sets;
Microcontroller arranges DAC by aforementioned LUT extinction ratio is carried out temperature-compensating.
2. high-speed low-power-consumption claimed in claim 1 is grown the method for work that Distance Transmission is used the XFP optical module, it is characterized in that: in the whole course of work, adopt software algorithm to fix the P2 value at the normal temperature place first, this P2 value is set need to be near the upper limit of ITU standard-required, and writes among the described LUT as initial value; Simultaneously by the given normal temperature of software algorithm place's delustring ratio; Again in high temperature place debugging P3 value, take the P2 value as the basis, the compensation extinction ratio, whether if extinction ratio reaches the ITU standard, it is up to standard then to test eye pattern mask, up to standard with regard to P3=P2, if eye pattern mask can not be up to standard, then the upper software algorithm in P2 value basis is whenever successively decreased a step by certain stepping luminous power of successively decreasing, need again to test in order extinction ratio and eye pattern mask, be limited to the desired luminous power lower limit of ITU standard under successively decreasing; Then gained P3 is the high temperature optimal value, and it is write described LUT, gets the P2 linear fit with the normal temperature place again, and software algorithm is given P3 place's delustring ratio simultaneously, again with normal temperature extinction ratio linear fit; Then in low temperature place debugging P1 value, take the P2 value as the basis, the compensation extinction ratio, whether up to standard, up to standard with regard to P1=P2 if then testing this eye pattern mask, if this eye pattern mask can not be up to standard, then the upper software algorithm in P2 value basis is by certain step increments luminous power, whenever increase progressively a step, need again to test in order extinction ratio and this eye pattern mask, be limited to the desired luminous power higher limit of this ITU standard on increasing progressively; Last gained P1 is the low temperature optimal value, gets the P2 linear fit with the normal temperature place, and software algorithm is given P1 place's delustring ratio simultaneously, again with normal temperature extinction ratio linear fit.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102215063B (en) * | 2011-05-31 | 2014-03-12 | 索尔思光电（成都）有限公司 | Core parameter debugging method of long distance XFP module based on electro-absorption modulated laser (EML) |
| WO2013143055A1 (en) * | 2012-03-26 | 2013-10-03 | 武汉华工正源光子技术有限公司 | Laser transceiver device, manufacturing method therefor, and method for enlarging temperature operating range thereof |
| CN102843191B (en) * | 2012-09-29 | 2015-03-25 | 青岛海信宽带多媒体技术有限公司 | Method and device for adjusting emitted light power of optical module |
| CN104682192B (en) * | 2013-01-06 | 2017-07-11 | 青岛海信宽带多媒体技术有限公司 | Generate the method and device of temperature lookup table of optical module |
| CN103078249B (en) * | 2013-01-06 | 2015-04-22 | 青岛海信宽带多媒体技术有限公司 | Method and device for generating temperature lookup table of optical module |
| CN104269737A (en) * | 2014-10-24 | 2015-01-07 | 成都新易盛通信技术股份有限公司 | Optical module as well as debugging system and debugging method thereof |
| CN105656562B (en) * | 2016-03-18 | 2018-02-16 | 江苏奥雷光电有限公司 | A kind of photoelectric conversion module extinction ratio autocontrol method |
| CN108631874B (en) * | 2017-03-20 | 2021-07-06 | 日照市艾锐光电科技有限公司 | Optical Line Terminal (OLT) optical assembly and optical module without refrigerator for 10G-PON application |
| CN109449727B (en) * | 2018-12-26 | 2020-11-10 | 东莞铭普光磁股份有限公司 | Optical module parameter configuration method, device, equipment and storage medium |
| CN112104424B (en) * | 2020-09-03 | 2022-04-01 | 南京捷澳德信息科技有限公司 | High-temperature extinction ratio optimization method for 5G forward-transmission industrial-grade optical module |
| CN113092867A (en) * | 2021-03-29 | 2021-07-09 | 上海橙科微电子科技有限公司 | Method, system and medium for testing continuity of impedance of light module transmission system through square wave |
| CN113258997B (en) * | 2021-06-28 | 2021-10-01 | 深圳博升光电科技有限公司 | Optical module and optical module control method |
| CN114284860B (en) * | 2021-12-16 | 2023-06-13 | 厦门亿芯源半导体科技有限公司 | Differential pressure adjustable DFB laser DC coupling output power supply configuration method |
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