CN104779995B - A kind of luminous power overload protecting circuit and method - Google Patents
A kind of luminous power overload protecting circuit and method Download PDFInfo
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- CN104779995B CN104779995B CN201510168976.4A CN201510168976A CN104779995B CN 104779995 B CN104779995 B CN 104779995B CN 201510168976 A CN201510168976 A CN 201510168976A CN 104779995 B CN104779995 B CN 104779995B
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Abstract
The present invention relates to optical communication field; disclose a kind of luminous power overload protecting circuit and method; by solve the problems, such as in the prior art by the series resistor between APD and relevant work voltage in a manner of solve luminous power overload when; due to the accurate and complexity of resistance selection; and it is difficult to obtain optimum reception sensitivity, or even the technical problem that APD can not be worked normally.The circuit includes：Photocurrent detection device, for detecting the size of received optical power and being converted to current signal；Luminous power stage circuit, the first pad value of optical signal is determined for the first current value based on current signal, and the control signal being controlled to the power of optical signal is produced based on the first pad value；Optical signal input, for receiving optical signal；Optical power attenuation device, is less than predetermined power value for the power based on control signal control optical signal；Light signal output end, optical signal and output for the input of received optical power attenuator.The technique effect for ensureing the sensitivity that signal receives is reached.
Description
Technical field
The present invention relates to optical communication field, more particularly to a kind of luminous power overload protecting circuit and method.
Background technology
In the prior art, optical receiving device, which frequently occurs received optical power overload, influences the skill of photodetector service life
Art problem, causes its sensitivity decrease, receives bit error rate increase, influences normal communication, or even causes permanent damage, to user
Cause significant impact.
At present industry eliminate luminous power overload solution, mainly by APD (Avalanche Photo Diode,
Avalanche photodide) series resistor between relevant work voltage, overload luminous power produce high current produced by the resistance
Pressure drop, so as to reduce APD voltages to protect circuit.
At least there are following technical problem for the scheme of the prior art：
1. the program while APD voltages are reduced, since APD can not be operated in best reception state, thus introduces
The noise of bigger, will also influence the sensitivity received, and may cause error code；
2. the selection of the resistance is needed by experiment and debugging repeatedly, and since resistance selects complexity,
And be difficult to obtain optimum reception sensitivity, or even APD can not be worked normally；
3. the program also can be used only in containing APD it is this need enough reverse bias voltages and can just be operated in most preferably connect
In the photodetector of receipts state, mainly by the way of reverse bias voltage is reduced, and for EPON (Ethernet
Passive Optical Network：Ethernet passive optical network) unit etc. do not contain APD equipment, will be unable to solve to receive light
The problem of power overload；
4. the resistance will also produce extra power attenuation.
The content of the invention
The present invention provides a kind of luminous power overload protecting circuit and method, to solve in the prior art by reducing APD's
When the mode of resistance solves the problems, such as luminous power overload, technical problem that caused receiving sensitivity is lower.
In a first aspect, the embodiment of the present invention provides a kind of luminous power overload protecting circuit, including：
Photocurrent detection device, for receiving optical signal and the size of the luminous power of the optical signal being converted to electric current letter
Number；
Luminous power stage circuit, is connected to the photocurrent detection device, for the first electric current based on the current signal
Value determines the first pad value of the optical signal, and the control being controlled to the luminous power is produced based on first pad value
Signal processed；
Optical signal input, for receiving the optical signal；
Optical power attenuation device, is connected to the luminous power stage circuit and the optical signal input, for receiving
To after the optical signal of optical signal input input, the power of the optical signal is controlled to be less than based on the control signal pre-
If performance number；
Light signal output end, is connected to the optical power attenuation device, for receiving the light of the optical power attenuation device input
Signal simultaneously exports.
Optionally, further include：
Pad value sets pin, the luminous power stage circuit is connected to, for setting the minimal attenuation of the optical signal
Value.
Optionally, the luminous power stage circuit, is specifically used for：
Based on the correspondence between current value and pad value, determine and described first corresponding to first current value
Pad value.
Optionally, the luminous power stage circuit, is specifically used for：
Determine the first current range corresponding to first current value；
It is determined at first pad value corresponding to first current range.
Optionally, the luminous power stage circuit, is specifically used for：
Determine the first performance number corresponding to first current value；
Determine first pad value corresponding to first performance number.
Optionally, the luminous power stage circuit, is specifically used for:Produced based on first pad value to the luminous power
The current controling signal that attenuator is controlled；Or produced based on first pad value and the optical power attenuation device is controlled
The voltage control signal of system.
Second aspect, the embodiment of the present invention provide a kind of luminous power overload protection method, including：
Optical signal is received by first line and the luminous power size of the optical signal is converted into current signal；
The first pad value of the luminous power is determined by the first current value of the current signal；
The control signal being controlled to the power of the optical signal is produced by first pad value；
The power of the optical signal of the second circuit is controlled to be less than predetermined power value by the control signal；
After being adjusted to the power of the optical signal, the optical signal is exported.
Optionally, first current value by the current signal determines the first pad value of the optical signal, tool
Body is：
Based on the correspondence between current value and pad value, determine and described first corresponding to first current value
Pad value.
Optionally, first current value by the current signal determines the first pad value of the optical signal, tool
Body includes：
Determine the first current range corresponding to first current value；
It is determined at first pad value corresponding to first current range.
Optionally, first current value by the current signal determines the first pad value of the optical signal, tool
Body includes：
Determine the first performance number corresponding to first current value；
Determine first pad value corresponding to first performance number.
The present invention has the beneficial effect that：
Due in embodiments of the present invention, there is provided a kind of luminous power overload protecting circuit, including：Photocurrent detection device,
For detecting reception optical signal and the size of the luminous power of optical signal being converted to current signal；Luminous power stage circuit, connection
In the photocurrent detection device, the first decay of the optical signal is determined for the first current value based on the current signal
Value, and the control signal being controlled to the luminous power is produced based on first pad value；Optical signal input, for connecing
Receive the optical signal；Optical power attenuation device, is connected to the luminous power stage circuit and the optical signal input, for
After the optical signal for receiving the optical signal input input, control the power of the optical signal small based on the control signal
In predetermined power value；Light signal output end, is connected to the optical power attenuation device, for receiving the optical power attenuation device input
Optical signal and output.By the Power Control of optical signal suitable namely by way of directly adjusting received optical power size
Within the scope of, without reducing APD reverse bias voltages, solving cannot be operated in and most preferably connect because APD voltages reduce
Receipts state, causes noise to increase, and the technical problem for causing sensitivity decrease and the bit error rate to increase, and having reached is preventing luminous power
While overload, the technique effect for the sensitivity that signal receives ensure that, while also ensure that the bit error rate will not increase；
Also, since resistance need not be increased, so extra power attenuation will not be caused；
Also, since the program is that the Power Control of optical signal is existed by way of directly adjusting received optical power size
Within the scope of suitable, without, to adjust the supply voltage for making APD work, not including to APD series resistances so being directed to
The photodetector of APD is also suitable；
Also, due to luminous power stage circuit in the program, it is first determined the first electric current model corresponding to the first current value
Enclose；It is then determined that in the first pad value corresponding to the first current range, that is to say, that match somebody with somebody for optical power attenuation size fractionation
Put, it is not necessary to which accurate adjust can reach rational decay with testing element value repeatedly, so that fast response time, user
Just；
And it is possible to the minimal attenuation value of pin configuration optical signal is set by pad value, so reality can be flexibly met
Border circuit needs.
Brief description of the drawings
Fig. 1 is the structure chart of luminous power overload protecting circuit in the embodiment of the present invention；
Fig. 2 is the flow chart of luminous power overload protection method in the embodiment of the present invention.
Embodiment
The present invention provides a kind of luminous power overload protecting circuit and method, to solve in the prior art by reducing APD's
When the mode of resistance solves the problems, such as luminous power overload, technical problem that caused receiving sensitivity is lower.
For technical solution in the embodiment of the present application to solve above-mentioned technical problem, general thought is as follows：
A kind of luminous power overload protecting circuit is provided, including：Photocurrent detection device, for detecting reception optical signal and inciting somebody to action
The size of the luminous power of optical signal is simultaneously converted to current signal；Luminous power stage circuit, is connected to the photocurrent detection device, uses
The first pad value of the optical signal is determined in the first current value based on the current signal, and is based on first pad value
Produce the control signal being controlled to the luminous power；Optical signal input, for receiving the optical signal；Optical power attenuation
Device, is connected to the luminous power stage circuit and the optical signal input, for receiving the optical signal input
After the optical signal of input, the power for controlling the optical signal based on the control signal is less than predetermined power value；Optical signal is defeated
Outlet, is connected to the optical power attenuation device, for receiving optical signal and the output of the optical power attenuation device input.Namely
By way of directly adjusting received optical power size by the Power Control of optical signal within the scope of suitable, without dropping
Low APD reverse bias voltages, best reception state cannot be operated in because APD voltages reduce by solving, and cause noise to increase, and
The technical problem for causing sensitivity decrease and the bit error rate to increase, has reached while preventing luminous power from overloading, ensure that signal
The technique effect of the sensitivity of reception, while also ensure that the bit error rate will not increase；
Also, since resistance need not be increased, so extra power attenuation will not be caused；
Also, since the program is that the Power Control of optical signal is existed by way of directly adjusting received optical power size
Within the scope of suitable, without, to adjust the supply voltage for making APD work, not including to APD series resistances so being directed to
The photodetector of APD is also suitable；
Also, due to luminous power stage circuit in the program, it is first determined the first electric current model corresponding to the first current value
Enclose；It is then determined that in the first pad value corresponding to the first current range, that is to say, that match somebody with somebody for optical power attenuation size fractionation
Put, it is not necessary to which accurate adjust can reach rational decay with testing element value repeatedly, so that fast response time, user
Just；
And it is possible to the minimal attenuation value of pin configuration optical signal is set by pad value, so reality can be flexibly met
Border circuit needs.
In order to better understand the above technical scheme, below by attached drawing and specific embodiment to technical solution of the present invention
It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention
Thin explanation, rather than the restriction to technical solution of the present invention, in the case where there is no conflict, the embodiment of the present invention and embodiment
In technical characteristic can be mutually combined.
In a first aspect, the embodiment of the present invention provides a kind of luminous power overload protecting circuit, please refer to Fig.1, including：
Photocurrent detection device 2, for detection reception optical signal and by the size of the luminous power of optical signal and is converted to electric current
Signal；
Luminous power stage circuit 4, is connected to photocurrent detection device 2, is determined for the first current value based on current signal
First pad value of optical signal, and the control signal being controlled to luminous power is produced based on the first pad value；
Optical signal input 1, for receiving optical signal；
Optical power attenuation device 3, is connected to luminous power stage circuit 4 and optical signal input 1, for receiving light letter
After the optical signal that number input terminal 1 inputs, the power based on control signal control optical signal is less than predetermined power value；
Light signal output end 8, is connected to optical power attenuation device 3, and the optical signal for the input of received optical power attenuator 3 is simultaneously
Output.
For example, the luminous power overload protecting circuit is for example applied to GPON ONU (Gigabit Passive
Optical Network Optical Network Unit：Gigabit Passive Optical Network optical network unit), GPON (Gigabit
Passive Optical Network：Gigabit Passive Optical Network) optical module, EPON ONU (Ethernet Passive
Optical Network Optical Network Unit：Ethernet passive optical network optical network unit) or EPON optical modules
Etc., wherein GPON ONU, GPON optical modules include APD, and EPON ONU or EPON optical module do not include APD.
Above-mentioned all parts will be introduced respectively below.
Wherein, optical signal is divided into two lines road, the light letter of first line after the luminous power overload protecting circuit is entered
Number then enter photocurrent detection device 2, and current signal is converted to by photocurrent detection device 2.
Luminous power stage circuit 4 then mainly determines whether optical signal overloads by the first current value of current signal
(because there are certain relation for the current value that is detected with it by photocurrent detection device of luminous power), and then based on optical signal
The degree whether power overloads and overload determines the first pad value of optical signal, is set forth below three kinds of determination modes therein
It is introduced, certainly in specific implementation process, is not limited to following three kinds of situations.
The first, luminous power stage circuit 4, is specifically used for：Based on the correspondence between current value and pad value, determine
With the first pad value corresponding to the first current value.
For example, each current value can be directed in the starting stage, determines that it can keep the power of optical signal respectively
Value is less than the pad value corresponding to predetermined power value, and stores the correspondence between current value and pad value, and then passes through this
Correspondence can obtain the first pad value corresponding to the first current value, so as to fulfill the control of the power to optical signal,
Due to having its corresponding pad value for each current value, so with the more accurate technique effect of control.
Second, luminous power stage circuit 4, is specifically used for：Determine the first current range corresponding to the first current value；Really
Due to the first pad value corresponding to the first current range.
For example, luminous power stage circuit 4 first can carry out received optical power used in everyday segmentation division scope,
For the corresponding probe current value of maximum luminous power of each scope, such as：Can between the power and probe current value of optical signal
With there are following correspondence：
Power * responsivenesses ... ... ... ... ... [1] Conversion of measurement unit relation of probe current value=optical signal：
DBm=10*log10(luminous power/1mW) ... ... ... ... ... [2]
Wherein, response efficiency is according to the material difference of photocurrent detection device 2 difference, be generally equivalent to 0.85A/w or
0.8A/w。
Under normal conditions, when optical signal is a certain scope, it can correspond to identical pad value, such as shown in table 1
Correspondence：
Table 1
| The power (dBm) of optical signal | <-8 | - 8~-4 | - 4~0 | 0~3 |
| Pad value (dB) | 0 | 5 | 10 | 15 |
The correspondence that above-mentioned table 1 can be then converted between current value and pad value, such as shown in table 2, herein
Responsiveness takes 0.85A/w：
Table 2
| Current value (uA) | <135 | 135~338 | 338~850 | 850~1696 |
| Pad value (dB) | 0 | 5 | 10 | 15 |
And then luminous power stage circuit 4 is after the first current value of current signal is obtained, it is possible to passes through above-mentioned table 2
Determine the first pad value of optical signals.
The third, luminous power stage circuit 4, is specifically used for：Determine the first performance number corresponding to the first current value；Determine
The first pad value corresponding to first performance number.
For example, that is, the first performance number can be calculated by above-mentioned formula [1], is calculating the first performance number
Afterwards, and the first pad value can be determined in several ways, be set forth below two kinds therein and be introduced, certainly, having
In body implementation process, following two situations are not limited to.
1. the correspondence based on performance number and pad value determines the first pad value.
For example, the performance number of each optical signal can be directed in the starting stage, determine that it can keep optical signal respectively
Performance number is less than the pad value corresponding to predetermined power value, and stores the corresponding pass between the performance number of optical signal and pad value
It is, and then the first pad value corresponding to the first performance number is directly acquired by correspondence.
2. determining the first performance number scope corresponding to the first performance number, first corresponding to the first performance number scope is determined
Pad value.
Exemplified by correspondence between the performance number scope shown in table 1 and pad value, it is assumed that the first performance number is 2dBm,
It is 0~3dBm that can then determine the first performance number scope, so that it is determined that it is 15dB to go out the first pad value.
Optical signal is then directly entered light after the luminous power overload protecting circuit is entered by the optical signal of the second circuit
Signal input part 1, then by optical power attenuation device 3；
Optical power attenuation device 3 is after optical signal is received, it is possible to passes through the control transmitted by luminous power stage circuit 4
Signal, which is realized, is controlled the watt level of optical signal.Wherein predetermined power value is, for example, that -8dBm (can certainly be other
Value, such as：0dBm, -4dBm etc.), if wherein the power of optical signal is not more than -8dBm, corresponding to control signal
One pad value is 0, namely will not change the size of the power of optical signal；If the power of optical signal is more than -8dBm, control letter
The first pad value corresponding to number can be according to the different and different of the size of the power of optical signal.By optical power attenuation device 3
Control, thereby may be ensured that the power of optical signal is less than predetermined power value, and then realize the overload protection of the power of optical signal.Light
Power attenuator 3 is, for example,：Automatically controlled optical power attenuation device 3.
In specific implementation process, when luminous power stage circuit 4 produces control signal, the control of diversified forms can be produced
Signal, is set forth below two kinds therein and is introduced, and certainly, in specific implementation process, is not limited to following two situations.
The first, luminous power stage circuit 4, is specifically used for:Produced based on pad value and optical power attenuation device 3 is controlled
Current controling signal.
Second, luminous power stage circuit 4, is specifically used for:Produced based on pad value and optical power attenuation device 3 is controlled
Voltage control signal.
As further preferred embodiment, please continue to refer to Fig. 1, which further includes：
Pad value sets pin 5, is connected to luminous power stage circuit 4, for setting the minimal attenuation value of optical signal, wherein
Minimal attenuation value is, for example,：5dB, 3dB etc., can set different minimal attenuation values according to the actual requirements, furthermore it is also possible to
The step value of pad value is set, such as：5dB, 10dB etc..The configured attenuation steps in inside of luminous power stage circuit 4 decline
Subtract stepping, but adjustable intraware, flexibly realize stepping for 3dB or 5dB etc..
As further preferred embodiment, please continue to refer to Fig. 1, which further includes：
Grounding pin 7, grounding pin one end are connected to luminous power stage circuit 4, other end ground connection；
VCC (power input pins：Voltage Current Condenser) 5, luminous power stage circuit 4 is connected to, is used
Power in circuit.
Second aspect, based on same inventive concept, the embodiment of the present invention provides a kind of luminous power overload protection method, please join
Fig. 2 is examined, including：
Step S201：Optical signal is received by first line and luminous power is converted into current signal；
Step S202：The first pad value of luminous power is determined by the first current value of current signal；
Step S203：The control signal being controlled to the power of optical signal is produced by the first pad value；
Step S204：The power of the optical signal of the second circuit is controlled to be less than predetermined power value by control signal；
Step S205：After being adjusted to the power of optical signal, optical signal is exported.
Optionally, the first pad value of optical signal is determined by the first current value of current signal, is specially：
Based on the correspondence between current value and pad value, determine and the first pad value corresponding to the first current value.
Optionally, the first pad value of optical signal is determined by the first current value of current signal, is specifically included：
Determine the first current range corresponding to the first current value；
It is determined at the first pad value corresponding to the first current range.
Optionally, the first pad value of optical signal is determined by the first current value of current signal, is specifically included：
Determine the first performance number corresponding to the first current value；
Determine the first pad value corresponding to the first performance number.
One or more embodiment of the invention, at least has the advantages that：
Due in embodiments of the present invention, there is provided a kind of luminous power overload protecting circuit, including：Photocurrent detection device,
For detecting the size of received optical power and being converted to current signal；Luminous power stage circuit, is connected to the photocurrent detection
Device, the first pad value of the optical signal is determined for the first current value based on the current signal, and based on described first
Pad value produces the control signal being controlled to the luminous power；Optical signal input, for receiving the optical signal；Light work(
Rate attenuator, is connected to the luminous power stage circuit and the optical signal input, for receiving the optical signal
After the optical signal of input terminal input, the power for controlling the optical signal based on the control signal is less than predetermined power value；Light
Signal output part, is connected to the optical power attenuation device, for receiving optical signal and the output of the optical power attenuation device input.
Namely by way of directly adjusting received optical power size by the Power Control of optical signal within the scope of suitable, without
Need to reduce APD reverse bias voltages, best reception state cannot be operated in because APD voltages reduce by solving, and cause noise
Increase, and the technical problem for causing sensitivity decrease and the bit error rate to increase, have reached while preventing luminous power from overloading, have ensured
The technique effect for the sensitivity that signal receives, while also ensure that the bit error rate will not increase；
Also, since resistance need not be increased, so extra power attenuation will not be caused；
Also, since the program is that the Power Control of optical signal is existed by way of directly adjusting received optical power size
Within the scope of suitable, without, to adjust the supply voltage for making APD work, not including to APD series resistances so being directed to
The photodetector of APD is also suitable；
Also, due to luminous power stage circuit in the program, it is first determined the first electric current model corresponding to the first current value
Enclose；It is then determined that in the first pad value corresponding to the first current range, that is to say, that match somebody with somebody for optical power attenuation size fractionation
Put, it is not necessary to which accurate adjust can reach rational decay with testing element value repeatedly, so that fast response time, user
Just；
And it is possible to the minimal attenuation value of pin configuration optical signal is set by pad value, so reality can be flexibly met
Border circuit needs.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and scope.In this way, if these modifications and changes of the present invention belongs to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these modification and variations.
Claims (10)
- A kind of 1. luminous power overload protecting circuit, it is characterised in that including：Photocurrent detection device, for receiving optical signal by first line and being converted to the size of the luminous power of the optical signal Current signal；Luminous power stage circuit, is connected to the photocurrent detection device, the decay stepping of inside configuration attenuation steps, for based on First current value of the current signal and the step value of pad value determine the first pad value of the optical signal, and based on described First pad value produces the control signal being controlled to the luminous power；Optical signal input, for passing through optical signal described in the second line receiver；Optical power attenuation device, is connected to the luminous power stage circuit and the optical signal input, for receiving After the optical signal for stating optical signal input input, the power of the optical signal is controlled to be less than default work(based on the control signal Rate value；Light signal output end, is connected to the optical power attenuation device, for receiving the optical signal of the optical power attenuation device input And export.
- 2. luminous power overload protecting circuit as claimed in claim 1, it is characterised in that further include：Pad value sets pin, the luminous power stage circuit is connected to, for setting the minimal attenuation value of the optical signal.
- 3. luminous power overload protecting circuit as claimed in claim 1, it is characterised in that the luminous power stage circuit, specifically For：Based on the correspondence between current value and pad value, determine and first decay corresponding to first current value Value.
- 4. luminous power overload protecting circuit as claimed in claim 1, it is characterised in that the luminous power stage circuit, specifically For：Determine the first current range corresponding to first current value；Determine and first pad value corresponding to first current range.
- 5. luminous power overload protecting circuit as claimed in claim 1, it is characterised in that the luminous power stage circuit, specifically For：Determine the first performance number corresponding to first current value；Determine first pad value corresponding to first performance number.
- 6. the luminous power overload protecting circuit as described in claim 1-5 is any, it is characterised in that the luminous power classification electricity Road, is specifically used for：The current controling signal being controlled to the optical power attenuation device is produced based on first pad value；Or The voltage control signal being controlled to the optical power attenuation device is produced based on first pad value.
- A kind of 7. luminous power overload protection method, it is characterised in that including：Optical signal is received by first line and the luminous power size of the optical signal is converted into current signal；The decay stepping of attenuation steps is configured, institute is determined by the first current value of the current signal and the step value of pad value State the first pad value of luminous power；The control signal being controlled to the power of the optical signal is produced by first pad value；The power of the optical signal of the second circuit is controlled to be less than predetermined power value by the control signal；After being adjusted to the power of the optical signal, the optical signal is exported.
- 8. the method for claim 7, it is characterised in that described to pass through the first current value of the current signal and decay The step value of value determines the first pad value of the optical signal, is specially：Based on the correspondence between current value and pad value, determine and first decay corresponding to first current value Value.
- 9. the method for claim 7, it is characterised in that described to pass through the first current value of the current signal and decay The step value of value determines the first pad value of the optical signal, specifically includes：Determine the first current range corresponding to first current value；Determine and first pad value corresponding to first current range.
- 10. the method for claim 7, it is characterised in that first current value by the current signal and decline The step value of depreciation determines the first pad value of the optical signal, specifically includes：Determine the first performance number corresponding to first current value；Determine first pad value corresponding to first performance number.
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| CN106817164B (en) * | 2015-11-27 | 2019-06-25 | 青岛海信宽带多媒体技术有限公司 | The guard method of avalanche photodide APD and device in a kind of optical module |
| CN109525312A (en) * | 2019-01-15 | 2019-03-26 | 哈尔滨工业大学（深圳） | A kind of photodetector protective device and method |
| CN111555820A (en) * | 2020-04-10 | 2020-08-18 | 南京光通光电技术有限公司 | Overload protection method for optical module receiving end |
| CN116782062A (en) * | 2022-03-07 | 2023-09-19 | 华为技术有限公司 | Optical power control method and device |
| CN115865185B (en) * | 2023-02-02 | 2023-12-22 | 中天通信技术有限公司 | Big light protection device, optical module and big light protection method |
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| US6987922B2 (en) * | 2002-12-05 | 2006-01-17 | Tropic Networks Inc. | Method and apparatus for controlling a variable optical attenuator in an optical network |
| CN102289197B (en) * | 2011-03-25 | 2012-12-19 | 武汉光迅科技股份有限公司 | Integrated control system and control method for variable optical attenuator |
| CN203504574U (en) * | 2013-10-23 | 2014-03-26 | 中国电子科技集团公司第三十四研究所 | Optical fiber communication system with function of self-adaptive receiving optical power adjustment |
| CN103532634A (en) * | 2013-10-23 | 2014-01-22 | 中国电子科技集团公司第三十四研究所 | Optical fiber communication system capable of regulating received optical power adaptively and running method thereof |
| CN204517815U (en) * | 2015-04-10 | 2015-07-29 | 博为科技有限公司 | A kind of luminous power overload protecting circuit |
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