CN104821478A - Integratable automatic debugging circuit for optical eye pattern transmitted by optical module - Google Patents
Integratable automatic debugging circuit for optical eye pattern transmitted by optical module Download PDFInfo
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Abstract
An integratable automatic debugging circuit for an optical eye pattern transmitted by an optical module relates to optical modules. The integratable automatic debugging circuit comprises the components of an algorithm module, an Ibias current DAC module, an Imod current DAC module, an Ibias current monitoring module and an Imod current monitoring module. The output end of the algorithm module is connected with the input end of the Ibias current DAC module and the input end of the Imod current DAC module. The output end of the Imod current DAC module is connected with the input end of the Ibias current monitoring module. The output end of the Imod current DAC module is connected with the input end of the Imod current monitoring module. The Ibias current output end of the Ibias current monitoring module and the Imod current output end of the Imod current monitoring module are connected with a driver chip input end of a laser. The Ibias current monitoring module and the Imod current monitoring module are connected with the algorithm module.
Description
Technical field
The present invention relates to optical module, the optical module especially relating to a kind of accessible site sends the automatic Debugging circuit of light eye pattern.
Background technology
Networks of Fiber Communications is connected to the Access Network of user terminal, and the technology of Access Network to be deduced the tide of " light entering and copper back " due to the development of network broadband demand.EPON because of easy maintenance, be convenient to install and expansion and be used widely, GPON (Gigabit-capable Passive Optical Network, gigabit passive optical network) becomes the best solution of intelligent acess.GPON is a kind of point-to-multipoint structure, the topological structures such as tree-shaped, star-like, bus-type can be formed flexibly, GPON is by OLT (the Optical Line Termination being arranged on console for centralized control, optical line terminal), be installed on EPON ODN (Optical Distribution Network) between the optical network unit ONU (Optical Network Unit, optical network unit) of customer site and OLT and ONU.GPON system adopts WDM (Wavelength DivisionMultiplexing) wavelength-division multiplex technique, realizes single fiber bi-directional transmission, realizes broadcast mode at OLT to ONU down direction, and the up direction of ONU to OLT adopts burst mode.
Optical module is the core component of ONU, mainly comprise laser driving chip, laser assembly, realize light/electricity, the conversion of electrical/optical signal, BOSA (Bi-direction Optical Sub Assembly, light transmit-receive integrated assembly) be the core devices of ONU optical module, comprise transmitting terminal and receiving terminal, transmitting terminal speed is 1.25Gbps, and receiving terminal assembly speed is 2.488Gbps.At transmitting terminal, the 1310nm laser that laser sends is through fiber waveguide, arrive the front end face of filter plate at an angle, all reflected into into optical fiber by end face at this, and the light signal of the 1310nm come in from optical fiber can whole wave plates after filtration, be converted into the signal of telecommunication, realize the function of single fiber bi-directional.In order to the operating state of monitoring laser, realize automated power adjustment, a part about 10% for the light that laser sends enters branch-waveguide, and monitored diode absorption, changes pilot signal into.Send the index that light eye pattern is ONU transmitting terminal most critical, eye pattern comprises abundant information, embodies the global feature of digital signal, can the quality of Efficient Evaluation digital signal.If it is bad to send light eye diagram quality, have a strong impact on the professional ability between ONU and OLT.
Laser diode is current control device, and it is then luminous that its forward current exceedes threshold current Ith, ordinary circumstance, in order to realize opening fast and turn off, can add DC bias current Ibias slightly larger than threshold current to laser diode; Laser export depend on its drive current amplitudes and Slop efficiency, its threshold current Ith and Slop efficiency all with temperature correlation, discrete type is larger.
The China Patent Publication No. threshold current that to be " a kind of automatically debug method of optical module light eye pattern " of CN201010519598.7 be by obtaining laser, then be threshold current and coefficient of balance sum by the bias current of computer installation optical module, realize automatic Debugging light eye pattern, without the need to by manually debugging.
China Patent Publication No. is only have the temperature-compensating look-up table of the core temperature of initiator block to take module temperature as index in " a kind of stable EML TOSA stablizes the method exporting light eye pattern " of CN 201110177788.X, the temperature-compensating look-up table in Ibias electric current, Imod electric current, bias voltage, crosspoint then with the core temperature of initiator block for index, light eye pattern module being exported by the method is more stable.
Tradition optical module eye pattern debud mode is: use ophthalmograp and light power meter, adopt pointwise to regulate, test, debug again, until meet the demands, efficiency is very low, each modular debugging completes and needs about 5min, and strong dependence ophthalmograp and light power meter in debug process, if do not have ophthalmograp, just how eye diagram quality is not known, too strong to the dependence of instrument.At present conventional ophthalmograp is mainly Tyke and Agilent, but the computational methods of instrument internal are different, so judge also can affect to some extent on the result of eye pattern debugging.And instrument in use needs major temperature compensation, dark current calibration etc., if forgotten, can cause test crash, also can affect the testing efficiency of light eye pattern.At present in order to prevent the change of eye diagram quality under high and low temperature environment, temperature compensation table can be set up to the extinction ratio of eye pattern, and transmitting optical power changes under high/low temperature not quite.
Summary of the invention
The object of this invention is to provide accessible site inner in laser driving chip, adjustable goes out suitable transmitting optical power and extinction ratio, can realize manpower-free's debugging of light eye pattern, the optical module of the debugging efficiency of lifting light eye pattern, a kind of accessible site of reduction debugging cost sends the automatic Debugging circuit of light eye pattern.
The present invention is provided with algoritic module, Ibias current digital analog conversion module, Imod current digital analog conversion module, Ibias current monitoring module, Imod current monitoring module; Described Ibias electric current represents DC bias current, Imod electric current representative debugging electric current;
Algoritic module output connects Ibias current digital analog conversion module input and Imod current digital analog conversion module input respectively, the input of the output termination Ibias current monitoring module of Ibias current digital analog conversion module, the input of the output termination Imod current monitoring module of Imod current digital analog conversion module, the Ibias current output terminal of Ibias current monitoring module and the Imod current output terminal of Imod current monitoring module connect the driver chip input of laser respectively; Ibias current monitoring module is connected back algoritic module again with Imod current monitoring module.
Operation principle of the present invention is as follows:
Utilize Ibias current digital analog-converted (Digital to Analog Converter, DAC) module, Ibias current monitoring module, Imod current digital analog conversion module, Imod current monitoring module realize the inner detection automatically of laser driving chip, then Ibias electric current and DA value (in register hexadecimal number) corresponding to Imod electric current is automatically regulated, until debug out suitable transmitting optical power and extinction ratio according to the algoritic module of feedback data in inside according to the computing formula of transmitting optical power Power and Extinction ratio.Thus realize manpower-free's debugging of light eye pattern.Promote the debugging efficiency of light eye pattern, reduce debugging cost.
(S is the Slop efficiency of laser to computing formula according to transmitting optical power: Pwr=(Imod/2+Ibias-Ith) * S, Ith is the threshold current of laser, by optical module, producer provides), and the optimal value of transmitting optical power that specifies of ONU and scope.The computing formula of extinction ratio according to sending light eye pattern: ER=10lg [(Imod+Ibias-Ith)/(Ibias-Ith)], and the optimal value of transmission light eye pattern extinction ratio that specifies of ONU and scope.
The present invention is in the integrated automatic functional module regulating Ibias electric current and the corresponding DA value of Imod electric current of original laser driver chip internal, according to the relation computing formula of Pwr and ER and Ibias electric current and Imod electric current and set normal value, the method of approaching gradually is adopted automatically to regulate chip internal register, automatic Debugging goes out suitable Ibias electric current and DA value corresponding to Imod electric current, and exports Ibias electric current and Imod current drives laser normally works.
The adjustment method that the automatic Debugging being sent light eye pattern by this accessible site circuit realiration optical module sends light eye pattern compared to traditional optical module eliminates the loaded down with trivial details of manual debugging, save manpower and equipment cost, and avoid subjective factor and the judgement of instrument error impact to light eye diagram quality of people.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention structure composition frame chart.
Fig. 2 is the laser transmitting terminal match circuit schematic diagram being integrated with the embodiment of the present invention.
Fig. 3 is the drive circuit for laser specificity analysis figure being integrated with the embodiment of the present invention.
Fig. 4 is that the embodiment of the present invention uses time eye pattern automatic Debugging flow chart.
Fig. 5 is that traditional light eye pattern manually debugs flow chart.
Embodiment
See Fig. 1, the embodiment of the present invention is provided with algoritic module 1, Ibias current digital analog conversion module 2, Imod current digital analog conversion module 3, Ibias current monitoring module 4, Imod current monitoring module 5; Described Ibias electric current represents DC bias current, Imod electric current representative debugging electric current.Algoritic module 1 output connects Ibias current digital analog conversion module 2 input and Imod current digital analog conversion module 3 input respectively, the input of the output termination Ibias current monitoring module 4 of Ibias current digital analog conversion module 2, the input of the output termination Imod current monitoring module 5 of Imod current digital analog conversion module 3, the Ibias current output terminal of Ibias current monitoring module 4 and the Imod current output terminal of Imod current monitoring module 5 connect the driver chip input of laser 6 respectively; Ibias current monitoring module 4 is connected back algoritic module 1 again with Imod current monitoring module 5.In FIG, mark 100 and represent the present invention.
During use, the driver chip that the present invention can be integrated in laser is inner, and wherein algoritic module carries out calculating according to the computing formula of Pwr and ER and adjusts the DA value of Ibias electric current and Imod electric current; The DA value of Ibias electric current is input to Ibias current digital analog conversion module circuit, the digital-to-analogue conversion of Ibias can be realized, the Ibias current value exported, be input to Ibias current monitoring module, Ibias electric current one tunnel feeds back to algoritic module circuit, and a road exports as chip of laser and is supplied to the bias current of laser as laser diode.The DA value of Imod electric current is input to Imod current digital analog conversion module circuit, the digital-to-analogue conversion of Imod can be realized, the Imod current value exported, be input to Imod current monitoring module, Imod electric current one tunnel feeds back to algoritic module circuit, and a road exports as chip of laser and is supplied to the modulated current of laser as laser diode.Through the normal work of the corresponding bias current Ibias drive laser together with modulated current Imod exported of suitable DA value that algoritic module is finally debugged out.
Participate in Fig. 2, the normal work of Ibias electric current drive laser together with Imod electric current that the suitable DA value correspondence of finally being debugged out by the present invention 100 of driver chip 61 inside being integrated in laser is exported, and need to coordinate with the quality of suitable laser transmitting terminal match circuit guarantee transmitting terminal light eye pattern.
Fig. 3 provides drive circuit for laser characteristic, obtain the Slop efficiency S of transmitting optical power and average value P wr and laser, threshold current Ith, DC bias current Ibias, modulated current Imod relational expression be:
Pwr＝(Imod/2+Ibias-Ith)*S (1)
Extinction ratio finger print block exports the ratio of the average light power P1 of " 1 " and the average light power P0 of output " 0 ".Namely threshold current Ith, the DC bias current Ibias of Extinction ratio and laser, the relational expression of modulated current Imod are:
ER＝10lg(P1/P0) (2)
ER＝10lg[(Imod+Ibias-Ith)/(Ibias-Ith)] (3)
See Fig. 4, when adopting embodiment of the present invention work, comprise the following steps:
1, whether configuration opens the register of automatic Debugging, and 0 for not open automatic Debugging, can manually debug;
2, configure the step length register of DA0 and DA1, select the step-length of DA0 and DA1;
3, the threshold current Ith of laser and the value (BOSA producer provides) of Slop efficiency is configured;
4, the desired value of transmitting optical power Pwr and Extinction ratio is configured;
5, the initial value of DA0 and DA1 is configured;
6, enable automatic compute switch;
7, draw the value of last DA0 and DA1, and enable for automatic compute switch closedown, calculate next time open again enable.
Tradition light eye pattern manually debugs flow chart see Fig. 5.
Claims (1)
1. the optical module of accessible site sends an automatic Debugging circuit for light eye pattern, it is characterized in that being provided with algoritic module, Ibias current digital analog conversion module, Imod current digital analog conversion module, Ibias current monitoring module, Imod current monitoring module;
Algoritic module output connects Ibias current digital analog conversion module input and Imod current digital analog conversion module input respectively, the input of the output termination Ibias current monitoring module of Ibias current digital analog conversion module, the input of the output termination Imod current monitoring module of Imod current digital analog conversion module, the Ibias current output terminal of Ibias current monitoring module and the Imod current output terminal of Imod current monitoring module connect the driver chip input of laser respectively; Ibias current monitoring module is connected back algoritic module again with Imod current monitoring module.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107493131A (en) * | 2017-07-17 | 2017-12-19 | 武汉电信器件有限公司 | The chip-scale eye diagram testing method and test device of a kind of semiconductor laser chip |
| CN108170109A (en) * | 2017-12-19 | 2018-06-15 | 武汉恒泰通技术有限公司 | A kind of optical transmitting set debugging apparatus and its adjustment method |
| CN112104424A (en) * | 2020-09-03 | 2020-12-18 | 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 |
| CN112346242A (en) * | 2020-12-03 | 2021-02-09 | 长飞光纤光缆股份有限公司 | Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module |
| CN117233457A (en) * | 2023-11-16 | 2023-12-15 | 成都明夷电子科技有限公司 | Method and equipment for testing high-speed modulation current of laser |
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| CN102013624A (en) * | 2010-10-26 | 2011-04-13 | 江苏奥雷光电有限公司 | Automatic debugging method for optical eye diagram of optical module |
| CN102347584A (en) * | 2011-06-29 | 2012-02-08 | 索尔思光电（成都）有限公司 | Method for stabilizing light eye diagram output by EML (equal matrix language) TOSA (transmitter optical subassembly) |
| WO2015041609A1 (en) * | 2013-09-19 | 2015-03-26 | Agency For Science, Technology And Research | Method and system for determining an optical eye diagram of a modulated optical beam of an interferometer device |
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| US20050152413A1 (en) * | 2004-01-14 | 2005-07-14 | Yi-Yang Chang | Laser driver circuit for burst mode transmission and manufacturing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493131A (en) * | 2017-07-17 | 2017-12-19 | 武汉电信器件有限公司 | The chip-scale eye diagram testing method and test device of a kind of semiconductor laser chip |
| CN108170109A (en) * | 2017-12-19 | 2018-06-15 | 武汉恒泰通技术有限公司 | A kind of optical transmitting set debugging apparatus and its adjustment method |
| CN112104424A (en) * | 2020-09-03 | 2020-12-18 | 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 |
| 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 |
| CN112346242A (en) * | 2020-12-03 | 2021-02-09 | 长飞光纤光缆股份有限公司 | Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module |
| CN112346242B (en) * | 2020-12-03 | 2021-05-28 | 长飞光纤光缆股份有限公司 | Method and device for quickly and automatically adjusting transmission eye pattern parameters of optical module |
| CN117233457A (en) * | 2023-11-16 | 2023-12-15 | 成都明夷电子科技有限公司 | Method and equipment for testing high-speed modulation current of laser |
| CN117233457B (en) * | 2023-11-16 | 2024-03-12 | 成都明夷电子科技有限公司 | Method and equipment for testing high-speed modulation current of laser |
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