CN102394696B - Method for monitoring burst emitting light power of optical module and optical module - Google Patents
Method for monitoring burst emitting light power of optical module and optical module Download PDFInfo
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- CN102394696B CN102394696B CN201110360764.8A CN201110360764A CN102394696B CN 102394696 B CN102394696 B CN 102394696B CN 201110360764 A CN201110360764 A CN 201110360764A CN 102394696 B CN102394696 B CN 102394696B
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Abstract
The invention discloses a method for monitoring burst emitting light power of an optical module and an optical module, wherein the method comprises the following steps: triggering a laser of the optical module to emit initial optical power after the optical module is assembled, and reading a first power value corresponding to the initial optical power and a first offset current value corresponding to the first power value; carrying out aging with electrification on the optical module, and after the temperature of the aging environment is stable, reading a second power value after the aging is stable, and a second offset current value corresponding to the second power value; using the first power value, the first offset current value, the second power value and the second offset value to fitting a temperature characteristic curve of the laser; and calculating certain offset current and burst emitting light power corresponding to the temperature by using the temperature characteristic curve. The method provided by the invention can control the optical module emitting light power in an open-loop manner to realize monitoring on the burst emitting light power, and improves the performance of the optical module.
Description
Technical field
The present invention relates to optical communication technique field, specifically, a kind of method that relates to optical module and optical module burst transmissions luminous power is monitored.
Background technology
PON is the english abbreviation of passive optical-fiber network, compared with active smooth access technology, PON is due to the active equipment of having eliminated between local side and user side, thus make to safeguard simple, reliability is high, cost is low, and can save fiber resource, be the main solution of following FTTH.
PON technology mainly contains EPON and GPON at present.The advantage of PON network is: (1) PON structure does not need power supply in transmission way, there is no electronic unit, therefore easily lays, and substantially need not safeguard, saves long-term operation cost and management cost.(2) PON network is prefect dielectric network, has thoroughly avoided electromagnetic interference and effects of lightning, and the utmost point is adapted at the severe area of natural conditions and uses.(3) PON system is little to local side resource occupation, and the system initial stage drops into low, and easily, rate of return on investment is high in expansion.(4) bandwidth that can provide very high bandwidth: EPON that the 1.25Gb/s of up-downgoing symmetry can be provided at present, and along with the development of ether technology can be upgraded to 10Gb/s; GPON can provide the bandwidth up to 2.5Gb/s.(5) service range is large: PON is as a kind of point-to-multipoint network, and the resource of saving CO with a kind of structure of fan-out, serves a large number of users, and user shares local side apparatus and optical fiber, and which has further been saved user's investment.(6) distribution and the guarantee to bandwidth of GPON system and EPON system has a set of rounded system, and allocated bandwidth is flexible, and service is reliable.Therefore, PON has not only had certain application market in FTTB/FTTC occasion, and utilizes PON to realize FTTH and also obtained larger progress at home and abroad.Along with increasing gradually of PON network application, more and more stricter to the performance requirement of the optical module using in PON network.
Taking the optical module that is applied in optical network unit end ONU as example, in the application of a lot of PON systems, need ONU to complete fast registration function, this just needs ONU receiving after the polling message of local side OLT, and the optical module of ONU end just sends a luminous power in first registration bag and extinction ratio can be by the light signal of OLT discrimination.Optical module of the prior art generally adopts the mode control utilizing emitted light power of closed-loop control, to utilize the back facet current that in laser, the diode backlight of encapsulation produces to carry out the monitoring of burst transmissions luminous power.But the foundation of luminous power needs the regular hour under close-loop control mode, in the time that laser is luminous for the first time, not necessarily can send the light signal under normal work, be difficult to realize the function of fast registration.If adopt the mode control utilizing emitted light power of open loop control, although can be at the laser luminous light signal that sends normal work for the first time, meet the needs of fast registration, but, under open loop control mode owing to cannot obtaining back facet current signal, therefore, can not realize the monitoring of optical module burst transmissions luminous power, therefore cannot realize the luminous deixis of digital diagnosis function and the laser of optical module.
In addition, existing optical module transmitting terminal adopts Distributed Feedback Laser, receiving terminal adopts APD diode, realize that laser drives, APD boosts, the funtion part such as multiplication of voltage, image current, limited range enlargement and optical module control adopts respectively independent chip to realize, and these chips and corresponding peripheral circuit thereof divide to be located on two circuit boards and encapsulate, encapsulation volume is large, manufacture, inconvenient maintenance, and cost is higher.
Summary of the invention
One of object of the present invention is to provide a kind of method for supervising of optical module burst transmissions luminous power, utilizes the method to adopting the optical module of open loop approach control utilizing emitted light power to realize the monitoring of burst transmissions luminous power, to have improved the performance of optical module.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
A method for supervising for optical module burst transmissions luminous power, described method comprises the steps:
After optical module has been assembled, trigger an initial luminous power of laser transmitting of optical module, read the first performance number corresponding to this initial luminous power and the first bias current value corresponding to this first performance number;
Then, optical module is carried out to electrified ageing, after ageing environment temperature stabilization, read aging the second performance number and the second bias current value corresponding to this second performance number when stable;
Utilize the temperature characteristics of the first performance number, the first bias current value and the second performance number and the second bias current value matching laser;
Utilize temperature characteristics to calculate certain bias current and burst transmissions luminous power corresponding to temperature.
Method for supervising as above, described burst transmissions optical power value meets SFF 8472 standard-requireds.
Two of object of the present invention is to provide a kind of optical module, this module can realize the monitoring of burst transmissions luminous power in the situation that not needing back facet current, be applicable to adopt the optical module of open loop approach control utilizing emitted light power, in realizing optical module fast registration, improve the performance of optical module.
For achieving the above object, the present invention adopts following technical proposals to realize:
A kind of optical module, comprises housing, and is arranged on laser, photodetector and circuit board in housing, and described optical module adopts following method monitoring burst transmissions luminous power:
After optical module has been assembled, trigger an initial luminous power of laser transmitting of optical module, read the first performance number and first bias current value corresponding to this first performance number of this initial luminous power;
Then, optical module is carried out to electrified ageing, after ageing environment temperature stabilization, read aging the second stable performance number and the second bias current value corresponding to this second performance number;
Utilize the temperature characteristics of the first performance number, the first bias current value and the second performance number and the second bias current value matching laser;
Utilize bias current value and the temperature value of temperature characteristics and monitoring to calculate corresponding burst transmissions optical power value.
Optical module as above, on described circuit board, be provided with the drive circuit for laser unit that described laser is driven, the amplitude limiting amplifier circuit unit that the light signal of photodetector reception is carried out to limited range enlargement, and the module control circuit unit that optical module is controlled, drive circuit for laser unit, amplitude limiting amplifier circuit unit and module control circuit unit adopt the first integrated circuit (IC) chip to realize.
Optical module as above, described photodetector is avalanche photodide APD, the circuit mirror current unit that promising APD provides the booster circuit unit boosting, the voltage-multiplying circuit unit that multiplication of voltage is provided and obtains APD image current is also set on described circuit board, and booster circuit unit, voltage-multiplying circuit unit and circuit mirror current unit adopt the second integrated circuit (IC) chip to realize.
Optical module as above, described circuit board is one, described the first integrated circuit (IC) chip and described the second integrated circuit (IC) chip are arranged on this circuit board.
Optical module as above, is provided with heat-conducting glue in described the first integrated circuit (IC) chip and described the second integrated circuit (IC) chip, and the first integrated circuit (IC) chip and the second integrated circuit (IC) chip contact with described housing by heat-conducting glue, to improve heat dispersion.
Optical module as above, described laser, described photodetector and described circuit board adopt SFF encapsulating structure to be encapsulated in described housing.
Compared with prior art, advantage of the present invention and good effect are:
1, while utilizing the described method for supervising of invention to carry out the monitoring of optical module burst transmissions luminous power, do not need to obtain the back facet current signal of optical module, therefore, adopt the optical module of the method diode backlight to be set for laser, reduced the cost of optical module, and optical module can adopt open loop approach control utilizing emitted light power, in realizing the fast registration of optical module, do not affect the monitoring to burst transmissions luminous power under open loop mode, improved the combination property of optical module.
2, on a circuit board of optical module, adopt the integrated chip of integrated multiple functional circuit unit to realize the circuit structure of optical module, not only reduce the area of circuit board, increase the reliability of system, reduced the cost of raw material and manufacture and maintenance cost simultaneously.
Read by reference to the accompanying drawings after the specific embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Brief description of the drawings
Fig. 1 is the flow chart of an embodiment of method for supervising of optical module burst transmissions luminous power of the present invention;
Fig. 2 is the part circuit structure block diagram of an embodiment of optical module of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail.
First the starting point of brief description technical solution of the present invention: for realizing the control luminous to laser, existing optical module adopts closed-loop fashion control utilizing emitted light power mostly, and under this control method, laser encapsulates together with diode backlight.Carry out high speed energy storage and sampling maintenance by the back facet current that diode backlight is produced, then utilize special monitoring chip to realize the accurate measurement of launching luminous power under optical module burst mode, realize the monitoring to burst transmissions luminous power.This class optical module is diode backlight because needs encapsulate, and cost is higher, encapsulation is complicated.On the other hand, under close-loop control mode, the foundation of luminous power needs the regular hour, not necessarily can send the light signal under normal work in the time that laser is luminous for the first time, is difficult to realize the function of fast registration.If remove diode backlight, adopt the mode control utilizing emitted light power of open loop control, although can be at the laser luminous light signal that sends normal work for the first time, meet the needs of fast registration, but, under open loop control mode, owing to cannot obtaining back facet current signal, can not realize the monitoring of optical module burst transmissions luminous power, cannot realize the luminous deixis of digital diagnosis function and the laser of optical module, this class optical module performance is lower.If adopt the optical module of open loop approach control utilizing emitted light power can realize the monitoring of burst transmissions luminous power, can improve the performance of optical module.
Based on above-mentioned thinking, the present invention proposes a kind of method for supervising of optical module burst transmissions luminous power, a kind of optical module that adopts this method for supervising is also provided, concrete grammar and optical module please refer to accompanying drawing embodiment and the following text description to embodiment.
Figure 1 shows that the flow chart of an embodiment of method for supervising of optical module burst transmissions luminous power of the present invention.This embodiment is according to the threshold current of laser with the function that tiltedly efficiency is temperature, the comparatively stable feature of utilizing emitted light power at normal temperatures, two points of choosing laser at normal temperatures and under high temperature are as characteristic point, utilize the temperature characteristics of characteristic point matching laser, then utilize temperature characteristics to realize the monitoring to laser burst transmissions luminous power.Idiographic flow is as follows:
S11: flow process starts.
S12: after optical module has formed, trigger an initial luminous power of laser transmitting of the optical module after assembling, read corresponding the first performance number and the first bias current value corresponding to this first performance number of initial luminous power now.The first performance number and the first bias current value are respectively laser characteristic value at normal temperatures.
S13: after optical module initial adjustment, optical module is carried out to electrified ageing, read the second performance number and the second bias current value corresponding to this second performance number after ageing environment temperature stabilization.What the second performance number reading after ageing environment temperature stabilization and the second bias current value were corresponding is laser characteristic value at high temperature.
S14: utilize the temperature characteristics of the first performance number, the first bias current value and the second performance number and the second bias current value matching laser, this temperature characteristics has reflected the relation of utilizing emitted light power, bias current and the temperature of laser.
S15: obtain after temperature characteristics, if will obtain burst transmissions luminous power, only need detect bias current and temperature, then utilize temperature characteristics just can obtain corresponding burst transmissions luminous power.
S16: flow process finishes.
Utilize the numerical value of burst transmissions luminous power corresponding to certain bias current that above-mentioned temperature characteristics obtains and temperature in full warm area, to meet the relevant requirements of SFF 8472 standards, meet the monitoring demand to burst transmissions luminous power.
Fig. 2 shows the part circuit structure block diagram of an embodiment of optical module of the present invention,
The optical module of this embodiment adopts the utilizing emitted light power of its inner laser device of open-loop control method control, and adopt the method described in above-mentioned Fig. 1 to carry out the monitoring of burst transmissions luminous power, thereby realize the luminous deixis of digital diagnosis function and the laser of optical module in conjunction with the circuit part of optical module.
In conjunction with Fig. 2, the optical module of this embodiment includes housing, is provided with optical assembly 21 and a circuit board in housing, is packaged with laser and photodetector in optical assembly 21.Optical assembly 21 and circuit board adopt SFF encapsulating structure to be encapsulated in housing.On circuit board, be provided with the drive circuit for laser unit 22 that laser is driven, the amplitude limiting amplifier circuit unit 23 that the light signal of photodetector reception is carried out to limited range enlargement, and the module control circuit unit 24 that whole optical module is controlled.In this embodiment, drive circuit for laser unit 22, amplitude limiting amplifier circuit unit 23 and module control circuit unit 24 are integrated in an integrated circuit (IC) chip U1, utilize an integrated chip U1 to realize three partial function circuit, and integrated chip U1 arrange housing in circuit board on.
In the optical module of this embodiment, photodetector is selected avalanche photodide APD to realize receiving optical signals and light signal is converted to the function of the signal of telecommunication.For coordinating APD normally to work, on circuit board, need to be set to the image current unit 27 that APD provides the booster circuit unit 25 boosting, the voltage-multiplying circuit unit 26 that multiplication of voltage is provided and obtains APD image current.In this embodiment, booster circuit unit 25, voltage-multiplying circuit unit 26 and circuit mirror current unit 27 are integrated in an integrated circuit (IC) chip U2, utilize an integrated chip U2 to realize three partial function circuit, and integrated chip U2 and integrated chip U1 are arranged on the same circuit board in housing.
The optical module of this embodiment adopts the integrated chip of integrated multiple functional circuits to replace multiple independently functional circuits, can simplify circuit structure, make circuit structure compacter, reduce circuit area occupied, adopt a circuit board can realize the configuration of all circuit functions unit, thereby reduce the quantity of circuit board used, reduced the space of the shared enclosure interior of circuit board.And, because functional circuit height is integrated, improve the reliability and stability of optical module work.
After adopting integrated chip and single circuit plate structure, the heat producing when by circuit working distributes as early as possible, on integrated circuit (IC) chip U1 and U2, be respectively arranged with heat-conducting glue, U1 and U2 contact with the housing of optical module by heat-conducting glue, thereby the heat that circuit working is produced is delivered on housing by heat-conducting glue, and then dispels the heat by housing.
Above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.
Claims (8)
1. a method for supervising for optical module burst transmissions luminous power, is characterized in that, described method comprises the steps:
After optical module has been assembled, trigger an initial luminous power of laser transmitting of optical module, read the first performance number corresponding to this initial luminous power and the first bias current value corresponding to this first performance number;
Then, optical module is carried out to electrified ageing, after ageing environment temperature stabilization, read aging the second performance number and the second bias current value corresponding to this second performance number when stable;
Utilize the temperature characteristics of the first performance number, the first bias current value and the second performance number and the second bias current value matching laser;
Utilize temperature characteristics to calculate certain bias current and burst transmissions luminous power corresponding to temperature.
2. method for supervising according to claim 1, is characterized in that, described burst transmissions optical power value meets SFF 8472 standard-requireds.
3. an optical module, comprises housing, and is arranged on laser, photodetector and circuit board in housing, it is characterized in that, described optical module adopts following method monitoring burst transmissions luminous power:
After optical module has been assembled, trigger an initial luminous power of laser transmitting of optical module, read the first performance number and first bias current value corresponding to this first performance number of this initial luminous power;
Then, optical module is carried out to electrified ageing, after ageing environment temperature stabilization, read aging the second stable performance number and the second bias current value corresponding to this second performance number;
Utilize the temperature characteristics of the first performance number, the first bias current value and the second performance number and the second bias current value matching laser;
Utilize bias current value and the temperature value of temperature characteristics and monitoring to calculate corresponding burst transmissions optical power value.
4. optical module according to claim 3, it is characterized in that, on described circuit board, be provided with the drive circuit for laser unit that described laser is driven, the amplitude limiting amplifier circuit unit that the light signal of photodetector reception is carried out to limited range enlargement, and the module control circuit unit that optical module is controlled, drive circuit for laser unit, amplitude limiting amplifier circuit unit and module control circuit unit adopt the first integrated circuit (IC) chip to realize.
5. optical module according to claim 4, it is characterized in that, described photodetector is avalanche photodide APD, the circuit mirror current unit that promising APD provides the booster circuit unit boosting, the voltage-multiplying circuit unit that multiplication of voltage is provided and obtains APD image current is also set on described circuit board, and booster circuit unit, voltage-multiplying circuit unit and circuit mirror current unit adopt the second integrated circuit (IC) chip to realize.
6. optical module according to claim 5, is characterized in that, described circuit board is one, and described the first integrated circuit (IC) chip and described the second integrated circuit (IC) chip are arranged on this circuit board.
7. optical module according to claim 6, it is characterized in that, in described the first integrated circuit (IC) chip and described the second integrated circuit (IC) chip, be provided with heat-conducting glue, the first integrated circuit (IC) chip and the second integrated circuit (IC) chip contact with described housing by heat-conducting glue.
8. according to the optical module described in any one in claim 3 to 7, it is characterized in that, described laser, described photodetector and described circuit board adopt SFF encapsulating structure to be encapsulated in described housing.
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Cited By (1)
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| CN109687904A (en) * | 2019-01-14 | 2019-04-26 | 广州致远电子有限公司 | A kind of short distance laser communication transmitting optical power calibration device and calibration method |
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| CN103368640B (en) * | 2013-05-10 | 2015-11-04 | 深圳市易飞扬通信技术有限公司 | Expansion optical module digital diagnostic monitoring improved system |
| CN103811988B (en) * | 2014-02-27 | 2017-04-26 | 深圳市联赢激光股份有限公司 | Method for controlling power of optical fibre laser device |
| CN107689831B (en) * | 2017-09-30 | 2020-04-03 | 中航海信光电技术有限公司 | Method and system for calculating change of threshold current and skew efficiency of laser along with time |
| CN111596421B (en) * | 2020-05-11 | 2022-04-05 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN111970052B (en) * | 2020-08-07 | 2021-07-20 | 无锡市德科立光电子技术股份有限公司 | Optical module optical power debugging method based on calculation |
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