CN102361217A - Intelligent guarantee method for optical module in high temperature environment - Google Patents
Intelligent guarantee method for optical module in high temperature environment Download PDFInfo
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- CN102361217A CN102361217A CN2011103350003A CN201110335000A CN102361217A CN 102361217 A CN102361217 A CN 102361217A CN 2011103350003 A CN2011103350003 A CN 2011103350003A CN 201110335000 A CN201110335000 A CN 201110335000A CN 102361217 A CN102361217 A CN 102361217A
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Abstract
The invention discloses an intelligent guarantee method for an optical module in a high temperature environment. The method comprises the following steps of: setting the highest set temperature for the optical module; when the optical module works in the high temperature environment, tracking and sampling the working temperature and the working current of the optical module; when the working temperature of the optical module exceeds the highest set temperature, stopping increasing the working current of a laser, so that the working temperature of the optical module does not increase any longer; setting the maximum current value for the working current of the laser; and when the working current of the laser exceeds the maximum current value, revising the working current of the laser into the maximum current value, so as to protect the optical module at high temperature.
Description
Technical field
The present invention relates to a kind of control method, particularly a kind of to the guarantee control method of optical module in hot environment.
Background technology
Existing optical module guarantees that through the control of hardware APC (auto light power control loop) circuit optical module luminous power in the total temperature scope is stable.Optical module causes luminous power to diminish because the luminous efficiency of laser reduces under hot environment, and the feedback signal that hardware APC control loop receives reduces, and it is stable that the APC control loop can increase laser works Current Control luminous power automatically.The electric current increase can cause the optical module oneself power consumption to increase; Working temperature further raises; The laser luminous efficiency of temperature rising optical module reduces; Luminous power reduces, and the feedback signal that hardware APC control loop receives further reduces, and it is stable that the APC control loop continues to increase laser works Current Control luminous power automatically.Such positive feedback control causes the optical module working temperature to raise always, and the specified safe temperature that surpasses optical module inner laser device when the working temperature of optical module just possibly cause laser unglazed, thereby causes the optical fiber communication interruption.
Seeing also shown in Figure 1ly, be the temperature variant change curve of P-I curve of laser, can see that the luminous power of laser becomes along with the increase of MOD (modulation) electric current and Bias (biasing) electric current greatly, is linear change basically; T2 is greater than under the T1 state, reduces with the variation of the rising luminous power of the temperature increase variable quantity with MOD (modulation) electric current and Bias (biasing) electric current, and the linear change curve slows down, and the oblique efficient that laser can be described raises with temperature and reduces; Under T3 overtemperature state; The oblique efficient of laser further reduces; Constant for the luminous power that guarantees laser, MOD (modulation) electric current and Bias (biasing) electric current continue to increase fast, and the power loss of laser produces heat raises the temperature continuation of laser fast; The work of laser got into the overtemperature state; Curve is on a declining curve with the increase of MOD (modulation) electric current and Bias (biasing) electric current, continues non-normal working and just might cause laser unglazed, further may damage laser.
See also shown in Figure 2; Be normal optical module MOD (modulation) current temperature compensated curve; Normal optical module MOD (modulation) electric current is the hardware circuit feedback compensation, and for the extinction ratio that guarantees module meets the standard-required of product, hardware circuit is realized compensation through various hardware algorithms.Because the oblique efficient of laser reduces with the rising of temperature, increase so just need MOD (modulation) electric current to raise with the module working temperature.Can see that the curve low-temperature space is milder; The high-temperature region is steeper, and the unrestricted increase with the rising of module working temperature, and is unfavorable to the drive circuit of laser like this; Can cause the temperature of module laser to continue to raise simultaneously, form a disadvantageous positive feedback loop.
See also shown in Figure 3; Be normal optical module Bias (biasing) current temperature compensated curve; Normal optical module Bias (biasing) electric current is the compensation of hardware APC (automated power control) loop feedback; For the luminous power that guarantees module meets the product standard requirement, hardware circuit is realized compensation through hardware algorithm.Because the oblique efficient of laser reduces with the rising of temperature, increase so just need Bias (biasing) electric current to raise with the module working temperature.Can see that the curve low-temperature space is milder; The high-temperature region is steeper, and the unrestricted increase with the rising of module working temperature, and is unfavorable to the drive circuit of laser like this; Can cause the temperature of module laser to continue to raise simultaneously, form a disadvantageous positive feedback loop.
Therefore, need a kind of new technical scheme to address the above problem.
Summary of the invention
To above-mentioned existing in prior technology problem and shortage, the purpose of this invention is to provide the intelligent support method of the optical module hot environment that at high temperature can protect optical module.
For realizing above-mentioned purpose, the intelligent support method of optical module hot environment of the present invention can adopt following technical scheme:
The intelligent support method of a kind of optical module hot environment; To the highest design temperature of optical module setting; Working temperature and operating current to optical module when optical module is operated in hot environment carry out tracking sampling; Then stop to increase the operating current of laser above the highest design temperature when the working temperature of optical module; Thereby the working temperature of optical module no longer increases, and the operating current to laser is provided with current maxima simultaneously, then the operating current of laser is revised as current maxima when the operating current of laser surpasses current maxima.
The present invention is compared with prior art: the working temperature through with optical module surpasses the operating current that the highest design temperature then stops to increase laser; And surpass the operating current that current maxima then is revised as the operating current of laser current maxima two aspects control laser when the operating current of laser, at high temperature optical module is protected.
Further; The intelligent support method of optical module hot environment of the present invention uses single-chip microcomputer through the temperature sampling module working temperature to be sampled and carries out the A/D conversion; Whenever, refresh inspection through 20 milliseconds; The temperature value that reads current conversion is through calculating the look-up table pointer of laser works bias current and laser works modulated current, tables look-up through software and calls the corresponding working current value that sets; The overcurrent threshold value of checking result and setting compares, if then be revised as the threshold current value to working current value greater than the threshold current value; Otherwise working current value is the value of tabling look-up.After over-current detection is accomplished, through the I of integrated IC
2The C port is write working current value in corresponding laser works bias current and the work modulated current control register, and this parameter of hardware circuit response of integrated IC is accomplished the security control to laser.
Description of drawings
Fig. 1 is the temperature variant change curve of P-I curve of laser.
Fig. 2 is normal optical module MOD current temperature compensated curve figure.
Fig. 3 is normal optical module Bias current temperature compensated curve figure.
Fig. 4 is for adopting intelligent optical module MOD current temperature compensated curve figure of the present invention.
Fig. 5 is for adopting intelligent optical module Bias current temperature compensated curve of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment; Further illustrate the present invention; Should understand following embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
The design selects the integrated application-specific integrated circuit scheme of technical grade MCU+ for use;
Integrated IC be a integrated laser driver and limiting amplifier in the optical module special chip of one, built-in multiple function control register has the I of standard
2C (two-wire system serial communication protocol) communication interface can be carried out total digitalization adjustment and setting through external microcontroller.
Technical grade MCU selects a function strong, the technical grade MCU (micro-control unit) that cost performance is high.Mcu resource requires: the highest 25M MIPS execution speed, 768B RAM, 16KB FLASH, the I of standard
2C (two-wire system serial communication protocol) communication interface, built-in temperature, voltage sensor, 10 A/D conversions, 10 resources such as D/A conversion.
Integrated IC chip can be selected single closed loop and two open loop mode of operation for use to Laser Drive, and we select single closed loop+two open loop mode of operation for use through the intelligent software analysis and Control.
At first, the laser characteristic that we use according to optical module is debugged and is provided with the corresponding look-up table of temperature, and look-up table carries out the processing that is provided with of threshold currents in high temperature section and low-temperature zone.Generally our value of searching set greater than 85 degree no longer increases, and promptly all values of tabling look-up greater than 85 degree are consistent with 85 degree, low temperature equally setting to be lower than the value of tabling look-up of 40 degrees below zero consistent with 40 degrees below zero.
Single-chip microcomputer is sampled to working temperature through the temperature sampling module and is carried out the A/D conversion; Whenever, refresh inspection through 20 milliseconds; The temperature value that reads current conversion is tabled look-up through software and is called the corresponding working current value that sets through calculating the look-up table pointer of Ibias (laser works bias current) electric current and Imod (laser works modulated current) electric current.The overcurrent threshold value of checking result and software setting compares, if then be revised as the threshold current value to working current value greater than the threshold current value; Otherwise working current value is the value of tabling look-up.After over-current detection is accomplished, through the I of integrated IC
2The C port is write working current value among the corresponding Ibias and Imod control register, and this parameter of hardware circuit response of integrated IC is accomplished the security control to laser.
Intellectuality control through MCU software; The persistently overheating phenomenon of positive feedback that we can avoid in the past possibly being occurred by the control of hardware APC loop fully under high temperature abnormality environment takes place, and can guarantee that optical module is worked under hot environment can infinitely not increase laser modulation current and cause not having optical phenomenon.
See also shown in Figure 4ly, for adopting intelligent optical module MOD current temperature compensated curve figure of the present invention, intelligent optical module MOD electric current compensates through intelligentized software algorithm.For the extinction ratio that guarantees module conforms to the standard-required of product, software control realizes compensation through various software algorithms.Because the oblique efficient of laser reduces with the rising of temperature, so increase with the rising of module working temperature with regard to needs MOD electric current.Can see that the curve low-temperature space is milder, the high-temperature region is steeper.Under the condition of high temperature,, under the prerequisite that satisfies the product standard requirement, the MOD electric current is carried out maximum judgement and restriction through the operating state of software monitoring optical module.The power consumption of optical module is no longer increased, and heat and ambient temperature that the optical module power consumption produces are set up heat balance, thereby make the working temperature of optical module stable, avoid getting into disadvantageous positive feedback loop and cause optical module unglazed.So, can guarantee the optical module working stability, communication is protected
See also shown in Figure 5ly, for adopting intelligent optical module Bias current temperature compensated curve of the present invention, intelligent optical module Bias electric current compensates through intelligentized software algorithm.For the luminous power that guarantees module meets the standard-required of product, under normal temperature and low-temperature working state, select quick hardware APC control through software control; Under the hot operation state, software control realizes the high temperature compensation through software algorithm.Because the oblique efficient of laser reduces with the rising of temperature, so increase with the rising of module working temperature with regard to needs Bias electric current.Can see that the curve low-temperature space is milder, the high-temperature region is steeper.Under the condition of high temperature,, under the prerequisite that satisfies the product standard requirement, the Bias electric current is carried out maximum judgement and restriction through the operating state of software monitoring optical module.The power consumption of optical module is no longer increased, and heat and ambient temperature that the optical module power consumption produces are set up heat balance, thereby make the working temperature of optical module stable, avoid getting into disadvantageous positive feedback loop and cause optical module unglazed.So, can guarantee the optical module working stability, communication is protected.
Claims (3)
1. the intelligent support method of an optical module hot environment; It is characterized in that: to the highest design temperature of optical module setting; Working temperature and operating current to optical module when optical module is operated in hot environment carry out tracking sampling; Then stop to increase the operating current of laser above the highest design temperature when the working temperature of optical module; Thereby the working temperature of optical module no longer increases, and the operating current to laser is provided with current maxima simultaneously, then the operating current of laser is revised as current maxima when the operating current of laser surpasses current maxima.
2. intelligent support method of optical module hot environment as claimed in claim 1; It is characterized in that: the use single-chip microcomputer is sampled to working temperature through the temperature sampling module and is carried out the A/D conversion; Whenever, refresh inspection through 20 milliseconds; The temperature value that reads current conversion is through calculating the look-up table pointer of laser works bias current and laser works modulated current, tables look-up through software and calls the corresponding working current value that sets; The overcurrent threshold value of checking result and setting compares, if then be revised as the threshold current value to working current value greater than the threshold current value; Otherwise working current value is the value of tabling look-up.
3. the intelligent support method of optical module hot environment as claimed in claim 2 is characterized in that: after over-current detection is accomplished, through the I of integrated IC
2The C port is write working current value in corresponding laser works bias current and the work modulated current control register, and this parameter of hardware circuit response of integrated IC is accomplished the security control to laser.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761052A (en) * | 2012-07-31 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical module working parameter adjusting method and adjusting device |
| CN107153437A (en) * | 2017-05-23 | 2017-09-12 | 青岛海信宽带多媒体技术有限公司 | Method for regulating temperature, device and the optical module of optical module |
| CN107293938A (en) * | 2017-08-15 | 2017-10-24 | 中航海信光电技术有限公司 | Method and system for prolonging service life of laser for optical module |
| CN108494496A (en) * | 2018-04-19 | 2018-09-04 | 青岛海信宽带多媒体技术有限公司 | Optical power value method of adjustment, system and optical module |
| CN110611533A (en) * | 2019-09-24 | 2019-12-24 | 四川天邑康和通信股份有限公司 | Method for filtering defective optical modules of ONU (optical network Unit) in production line |
| CN111934758A (en) * | 2020-07-28 | 2020-11-13 | 长飞光纤光缆股份有限公司 | Automatic adjusting and measuring method and device for emitted light power and eye pattern of optical module |
-
2011
- 2011-10-28 CN CN2011103350003A patent/CN102361217A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761052A (en) * | 2012-07-31 | 2012-10-31 | 青岛海信宽带多媒体技术有限公司 | Optical module working parameter adjusting method and adjusting device |
| CN107153437A (en) * | 2017-05-23 | 2017-09-12 | 青岛海信宽带多媒体技术有限公司 | Method for regulating temperature, device and the optical module of optical module |
| CN107293938A (en) * | 2017-08-15 | 2017-10-24 | 中航海信光电技术有限公司 | Method and system for prolonging service life of laser for optical module |
| CN108494496A (en) * | 2018-04-19 | 2018-09-04 | 青岛海信宽带多媒体技术有限公司 | Optical power value method of adjustment, system and optical module |
| CN110611533A (en) * | 2019-09-24 | 2019-12-24 | 四川天邑康和通信股份有限公司 | Method for filtering defective optical modules of ONU (optical network Unit) in production line |
| CN111934758A (en) * | 2020-07-28 | 2020-11-13 | 长飞光纤光缆股份有限公司 | Automatic adjusting and measuring method and device for emitted light power and eye pattern of optical module |
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Application publication date: 20120222 |