CN104821478B - A kind of optical module integrated sends the automatic debug circuit of light eye figure - Google Patents
A kind of optical module integrated sends the automatic debug circuit of light eye figure Download PDFInfo
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Abstract
A kind of optical module integrated sends the automatic debug circuit of light eye figure, is related to optical module.Equipped with algoritic module, Ibias current DAC module, Imod current DAC module, Ibias current monitoring module, Imod current monitoring module；Algoritic module output end connects Ibias current DAC module input and Imod current DAC module input respectively, Ibias current DAC module output termination Ibias current monitoring module input, Imod current DAC module output termination Imod current monitoring module input, 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 terminal of laser respectively；Ibias current monitoring module and Imod current monitoring module take back algoritic module.
Description
Technical field
The present invention relates to optical modules, and the automatic debugging electricity of light eye figure is sent more particularly, to the optical module that one kind can integrate
Road.
Background technique
Networks of Fiber Communications is connected to the access net of user terminal, accesses development of the technology due to network broadband demand of net
It is deducing the tide of " light entering and copper back ".Passive optical network because of easy maintenance, be easily installed and be used widely due to extension,
GPON (Gigabit-capable Passive Optical Network, gigabit passive optical network) becomes intelligent acess
Best solution.GPON is a kind of point-to-multipoint structure, can flexibly form the topology knot such as tree-shaped, star-like, bus-type
Structure, GPON is by being mounted on the OLT (Optical Line Termination, optical line terminal) of console for centralized control, being installed on use
Passive light between the optical network unit ONU (Optical Network Unit, optical network unit) and OLT and ONU in family place
Network ODN (Optical Distribution Network).GPON system uses WDM (Wavelength Division
Multiplexing) wavelength-division multiplex technique realizes single fiber bi-directional transmission, realizes broadcast mode, ONU in OLT to ONU down direction
Up direction to OLT uses burst mode.
Optical module is the core component of ONU, mainly include laser driving chip, laser assembly, realize optical electrical, electricity/
Optical signal conversion, BOSA (Bi-direction Optical Sub Assembly, light transmit-receive integrated component) is ONU optical module
Core devices, including transmitting terminal and receiving end, transmitting terminal rate is 1.25Gbps, and receiving end component rate is 2.488Gbps.
In transmitting terminal, the 1310nm laser that laser issues passes through optical waveguide, reaches the front end face of filter plate at an angle, herein by
End face is all reflected into optical fiber, and the optical signal of the 1310nm to come in from optical fiber can be converted all by filter plate
At electric signal, the function of single fiber bi-directional is realized.For the working condition of monitoring laser, automated power adjustment, laser are realized
A part of the light of sending about 10% enters branch-waveguide, and be monitored diode absorption, is changed into monitoring signal.Send light eye figure
It is the index of ONU transmitting terminal most critical, eye figure includes information abundant, embodies the global feature of digital signal, can effectively comment
Estimate the quality of digital signal.If it is bad to send light eye diagram quality, the professional ability between ONU and OLT is seriously affected.
Laser diode is current control device, and forward current is more than that threshold current Ith then shines, and ordinary circumstance is
It realizes and is quickly switched on and off, it can be to laser diode plus the DC bias current Ibias for being slightly larger than threshold current；Laser
Device output depends on its drive current amplitudes and Slop efficiency, and threshold current Ith and Slop efficiency are all related to temperature, discrete type
It is larger.
China Patent Publication No. is that a kind of " the automatic adjustment method of optical module light eye figure " of CN201010519598.7 is
It is then threshold current and balance system by the bias current of computer installation optical module by obtaining the threshold current of laser
The sum of number realizes automatic debugging light eye figure, without by manually being debugged.
" a kind of stable output light eye figure of stable EML TOSA that China Patent Publication No. is CN 201110177788.X
Only have the temperature-compensating look-up table of the DIE Temperature of initiator block with module temperature for index in method ", and Ibias electric current,
Imod electric current, bias, crosspoint temperature-compensating look-up table then with the DIE Temperature of initiator block be index, pass through the method
The light eye figure for exporting module is more stable.
Traditional optical module eye figure debud mode are as follows: use ophthalmograp and light power meter, adjust, test, again adjust using point-by-point
Examination, until meeting the requirements, efficiency is very low, and each modular debugging completion needs 5min or so, relies on ophthalmograp by force in debugging process
And light power meter, it is too strong to the dependence of instrument if just how not knowing eye diagram quality without ophthalmograp.It is currently used
Ophthalmograp is mainly Tyke and Agilent, but the calculation method of instrument internal is different, so to the result of eye figure debugging
Judgement can also be influenced.And instrument needs major temperature compensation, dark current calibration etc. in use, if forgotten,
It will lead to test crash, also will affect the testing efficiency of light eye figure.Currently in order to preventing the change of eye diagram quality under high and low temperature environment
Change, temperature compensation table can be established to the extinction ratio of eye figure, and transmitting optical power changes less under high/low temperature.
Summary of the invention
It is adjustable to try out suitable transmitting optical power the object of the present invention is to provide can be integrated in inside laser driving chip
With extinction ratio, it can be achieved that the manpower-free of light eye figure debugs, one kind of the debugging efficiency, reduction debugging cost that promote light eye figure can collect
At optical module send light eye figure automatic debug circuit.
The present invention is equipped with algoritic module, Ibias current digital analog conversion module, Imod current digital analog-converted mould
Block, Ibias current monitoring module, Imod current monitoring module；The Ibias electric current represents DC bias current, Imod electric current
Represent debugging electric current；
Algoritic module output end connects Ibias current digital analog conversion module input terminal and the simulation of Imod current digital respectively
Conversion module input terminal, the input terminal of the output termination Ibias current monitoring module of Ibias current digital analog conversion module,
The input terminal of the output termination Imod current monitoring module of Imod current digital analog conversion module, Ibias current monitoring module
Ibias current output terminal and Imod current monitoring module Imod current output terminal connect respectively laser driver chip it is defeated
Enter end；Ibias current monitoring module and Imod current monitoring module reconnect back algoritic module.
Working 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 are realized inside laser driving chip
Automatic detection, then according to feedback data in internal algoritic module according to the calculating of transmitting optical power Power and Extinction ratio
Formula automatically adjusts Ibias electric current and the corresponding DA value of Imod electric current (hexadecimal number in register), closes until debugging out
Suitable transmitting optical power and extinction ratio.To realize manpower-free's debugging of light eye figure.The debugging efficiency of light eye figure is promoted, reduces and adjusts
Try cost.
According to the calculation formula of transmitting optical power: Pwr=(Imod/2+Ibias-Ith) * S (S is the Slop efficiency of laser,
Ith be laser threshold current, by optical module producer provide) and ONU as defined in transmitting optical power optimal value and model
It encloses.According to the calculation formula for the extinction ratio for sending light eye figure: ER=10lg [(Imod+Ibias-Ith)/(Ibias-Ith)], and
The optimal value and range of light eye figure extinction ratio are sent as defined in ONU.
The present invention integrates an automatic adjustment Ibias electric current and Imod electric current in original laser driver chip interior
The functional module of corresponding DA value is standardized according to the relationship calculation formula and its setting of Pwr and ER and Ibias electric current and Imod electric current
Value automatically adjusts chip internal register using the method gradually approached, and debugs out suitable Ibias electric current and Imod electricity automatically
Corresponding DA value is flowed, and exports Ibias electric current and Imod electric current driving laser normal work.
By it is this can integrated circuit realize optical module send light eye figure it is automatic debugging compared to traditional optical module transmission
The adjustment method of light eye figure eliminates the cumbersome of manual debugging, saves manpower and equipment cost, and avoids the subjectivity of people
Factor and instrument error influence the judgement to light eye diagram quality.
Detailed description of the invention
Fig. 1 is structure composition block diagram of the embodiment of the present invention.
Fig. 2 is the laser transmitting terminal match circuit schematic diagram for being integrated with the embodiment of the present invention.
Fig. 3 is the laser driving circuit specificity analysis figure for being integrated with the embodiment of the present invention.
Fig. 4 is that the embodiment of the present invention uses the time automatic debugging flow chart of eye figure.
Fig. 5 is that traditional light eye figure debugs flow chart manually.
Specific embodiment
Referring to Fig. 1, the embodiment of the present invention is equipped with algoritic module 1, Ibias current digital analog conversion module 2, Imod electric current
Digital-to-analogue conversion module 3, Ibias current monitoring module 4, Imod current monitoring module 5；The Ibias electric current represents direct current
Bias current, Imod electric current represent debugging electric current.1 output end of algoritic module connects Ibias current digital analog conversion module 2 respectively
3 input terminal of input terminal and Imod current digital analog conversion module, the output termination of Ibias current digital analog conversion module 2
The output of the input terminal of Ibias current monitoring module 4, Imod current digital analog conversion module 3 terminates Imod current monitoring mould
The input terminal of block 5, the Ibias current output terminal of Ibias current monitoring module 4 and the Imod electric current of Imod current monitoring module 5
Output end connects the driver chip input terminal of laser 6 respectively；Ibias current monitoring module 4 and Imod current monitoring module 5 are again
Connect back to algoritic module 1.In Fig. 1, label 100 indicates the present invention.
In use, the present invention can integrate inside the driver chip of laser, wherein algoritic module is according to Pwr and ER
Calculation formula calculated and adjusted the DA value of Ibias electric current and Imod electric current；The DA value of Ibias electric current is input to
The digital-to-analogue conversion of Ibias, the Ibias current value of output, input may be implemented in Ibias current digital analog conversion module circuit
To Ibias current monitoring module, Ibias electric current is fed back all the way to algoritic module circuit, is mentioned all the way as chip of laser output
Supply bias current of the laser as laser diode.The DA value of Imod electric current is input to Imod current digital analog-converted mould
Block circuit, may be implemented the digital-to-analogue conversion of Imod, and the Imod current value of output is input to Imod current monitoring module, Imod electricity
Feedback arrives algoritic module circuit to stream all the way, is supplied to tune of the laser as laser diode as chip of laser output all the way
Electric current processed.By the bias current Ibias and modulation electric current of the corresponding output of suitable DA value that algoritic module is finally debugged out
Imod drives the normal work of laser together.
Participate in Fig. 2, by be integrated in the present invention 100 driver chip 61 of laser inside it is final debug out it is suitable
The Ibias electric current of the corresponding output of DA value the normal work of laser is driven together with Imod electric current, and need to cooperate to close
Suitable laser transmitting terminal match circuit just can guarantee the quality of transmitting terminal light eye figure.
Fig. 3 provides laser driving circuit characteristic, obtain transmitting optical power i.e. average value P wr and laser Slop efficiency S,
Threshold current Ith, DC bias current Ibias, the relational expression for modulating electric current Imod are as follows:
Pwr=(Imod/2+Ibias-Ith) * S (1)
Extinction ratio refers to the ratio of the average light power P1 of module output " 1 " and the average light power P0 of output " 0 ".That is delustring
Than the threshold current Ith of ER and laser, DC bias current Ibias, the relational expression for modulating electric current Imod are as follows:
ER=10lg (P1/P0) (2)
ER=10lg [(Imod+Ibias-Ith)/(Ibias-Ith)] (3)
Referring to fig. 4, when being worked using the embodiment of the present invention, comprising the following steps:
1, whether configuration opens the register debugged automatically, and 0, to be not turned on automatic debugging, can be debugged manually；
2, the step length register of DA0 and DA1 is configured, the step-length of DA0 and DA1 is selected；
3, the threshold current Ith of laser and the value (offer of BOSA producer) of Slop efficiency are provided；
4, the target value of transmitting optical power Pwr and Extinction ratio are configured；
5, the initial value of DA0 and DA1 is configured；
6, automatic calculate is enabled to switch；
7, obtain the value of last DA0 and DA1, and calculate that switch is enabled to close automatic, calculate next time open again it is enabled.
Traditional light eye figure debugs flow chart referring to Fig. 5 manually.
Claims (1)
1. the automatic debug circuit that the optical module that one kind can integrate sends light eye figure, it is characterised in that be equipped 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 end connects Ibias current digital analog conversion module input terminal and Imod current digital analog-converted respectively
Module input, the input terminal of the output termination Ibias current monitoring module of Ibias current digital analog conversion module, Imod
The input terminal of the output termination Imod current monitoring module of current digital analog conversion module, Ibias current monitoring module
Ibias current output terminal and the Imod current output terminal of Imod current monitoring module connect the driver chip input of laser respectively
End；Ibias current monitoring module and Imod current monitoring module reconnect back algoritic module；
In use, be integrated in inside the driver chip of laser, wherein algoritic module is according to average value P wr and Extinction ratio
Calculation formula is calculated and is adjusted 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, realizes the digital-to-analogue conversion of Ibias, and the Ibias current value of output is input to Ibias electric current
Monitoring module, Ibias electric current is fed back all the way arrives algoritic module circuit, and Ibias electric current another way is mentioned as chip of laser output
Supply bias current of the laser as laser diode；The DA value of Imod electric current is input to Imod current digital analog-converted mould
Block circuit realizes the digital-to-analogue conversion of Imod, and the Imod current value of output is input to Imod current monitoring module, and Imod electric current is all the way
Algoritic module circuit is fed back, Imod electric current another way is supplied to laser as laser diode as chip of laser output
Modulation electric current；
The Slop efficiency S of the average value P wr and laser, threshold current Ith, DC bias current Ibias, modulation electric current Imod
Relational expression are as follows:
Pwr=(Imod/2+Ibias-Ith) * S
The threshold current Ith of the Extinction ratio and laser, DC bias current Ibias, the relation table for modulating electric current Imod
Up to formula are as follows:
ER=10lg (P1/P0)
ER=10lg [(Imod+Ibias-Ith)/(Ibias-Ith)]
Wherein, extinction ratio refers to the ratio of the average light power P1 of module output " 1 " and the average light power P0 of output " 0 "；
By the Ibias electric current and Imod that are integrated in the corresponding output of the DA value finally debugged out inside the driver chip of laser
Electric current drives the normal work of laser together, and cooperates the matter of laser transmitting terminal match circuit guarantee transmitting terminal light eye figure
Amount.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107493131B (en) * | 2017-07-17 | 2020-06-30 | 武汉电信器件有限公司 | Chip-level eye pattern testing method and device for 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 |
| 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 |
| 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 |
| 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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| TWI228849B (en) * | 2004-01-14 | 2005-03-01 | Asia Optical Co Inc | Laser driver circuit for burst mode and making method thereof |
| TWI228850B (en) * | 2004-01-14 | 2005-03-01 | Asia Optical Co Inc | Laser driver circuit for burst mode and making method thereof |
| US8005133B2 (en) * | 2006-04-27 | 2011-08-23 | Jds Uniphase Corporation | Displaying eye-diagram and digital diagnostic data using network analyzers |
| 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 |
| CN102347584B (en) * | 2011-06-29 | 2012-10-31 | 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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