CN108880671A - The signal loss detection circuit and device of four-way optical module - Google Patents
The signal loss detection circuit and device of four-way optical module Download PDFInfo
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- CN108880671A CN108880671A CN201810640981.4A CN201810640981A CN108880671A CN 108880671 A CN108880671 A CN 108880671A CN 201810640981 A CN201810640981 A CN 201810640981A CN 108880671 A CN108880671 A CN 108880671A
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- signal
- optical module
- way optical
- dropout
- loss detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of signal loss detection circuit of four-way optical module and device, the signal loss detection circuit of the four-way optical module includes voltage conversion circuit, MCU and dropout state output device；Voltage conversion circuit, the current signal that the light-receiving component for acquiring four-way optical module is exported, and current signal is converted into voltage signal；MCU, for carrying out AD sampling to voltage signal, and according to the AD value and preset dropout judgment threshold sampled, judge whether four-way optical module has occurred dropout, and corresponding control signal is exported when determining four-way optical module and dropout having occurred to dropout state output device, carrying out output to the dropout state of four-way optical module to control dropout state output device shows.The present invention can greatly improve the judgment accuracy to four-way optical module dropout.
Description
Technical field
The present invention relates to optical module field more particularly to the signal loss detection circuits and dress of a kind of four-way optical module
It sets.
Background technique
In four-way optical module, in 40G QSFP+LR4 optical module, transmitting terminal and receiving end are all four-way 10G speed
Rate CWDM (CWDM, Coarse Wavelength Division Multiplexing, coarse wavelength division multiplexer device) device passes through
WDM (WDM, Wavelength Division Multiplexing, wavelength-division multiplex) by signal together with, in order to save space
And power consumption is reduced, receives link is using improve ROSA (ROSA, Receiver Optical Subassembly, light-receiving component)
Output voltage swing and the scheme of limiting amplifier is not added so that product can not provide LOS (LOS, Loss Of Signal, signal
Lose) detection function.
Since 40G QSFP+LR4 optical module has the reception of 4 tunnels, in order to avoid occupying multi-pipe pin, do not have in QSFP+ agreement
There is regulation hardware LOS output pin, defines only software LOS instruction state.In the prior art, four-way optical module or do not have
LOS is arranged to indicate function or read by DDM (DDM, Digital Diagnostic Monitoring, digital diagnosis function)
It takes received optical power to judge the los state of optical module, i.e., judges whether optical module occurs by detection received optical power DDM value
Dropout, such scheme is not since the Stability and veracity of received optical power DDM value is high, so as to cause to four-way light
The judgment accuracy of module los state is lower；Also, the prior art judges above by detection received optical power DDM value
The scheme whether optical module has occurred dropout is realized by software algorithm, and due to that can draw when software the Fitting Calculation
Enter error, to further affect the judgment accuracy to four-way optical module dropout.
Summary of the invention
The main purpose of the present invention is to provide a kind of signal loss detection circuits of four-way optical module, it is intended to raising pair
The judgment accuracy of four-way optical module dropout.
To achieve the goals above, the present invention provides a kind of signal loss detection circuit of four-way optical module, and described four
The signal loss detection circuit of channel optical module includes voltage conversion circuit, MCU and dropout state output device；Wherein：
The voltage conversion circuit, the electric current letter that the light-receiving component for acquiring the four-way optical module is exported
Number, and the current signal is converted into voltage signal；
The MCU for carrying out AD sampling to the voltage signal, and loses according to the AD value and preset signal that sample
Judgment threshold is lost, judges whether the four-way optical module has occurred dropout, and determining the four-way optical module
The corresponding control signal of output is lost to the dropout state output device with controlling the signal when dropout has occurred
Mistake state output device carries out output to the dropout state of the four-way optical module and shows；
The light-receiving component of the four-way optical module, for being converted to the optical signal for being input to the light-receiving component
The current signal.
Preferably, the signal loss detection circuit of the four-way optical module further includes：
Sampling hold circuit, the voltage signal for exporting to the voltage conversion circuit carries out signal holding, so that institute
Voltage signal is stated to keep stablizing.
Preferably, the signal loss detection circuit of the four-way optical module further includes：
Filter circuit, the voltage signal for exporting to the sampling hold circuit is filtered, so as to be input to
The voltage signal of the MCU is completely stable voltage signal.
Preferably, the letter of the light-receiving component of the signal input part of the voltage conversion circuit and the four-way optical module
The connection of number output end, the signal output end of the voltage conversion circuit are connect with the signal input part of the sampling hold circuit,
The signal output end of the sampling hold circuit is connect through the filter circuit with the ADC interface of the MCU, the dropout
State output device is connect with the I/O port of the MCU.
Preferably, the dropout state output device is indicator light, and the MCU is determining the four-way optical mode
The corresponding control signal of output is lighted to the indicator light with controlling the indicator light when dropout has occurred in block.
Preferably, the dropout state output device is buzzer, and the MCU is determining the four-way optical mode
The corresponding control signal of output is to the buzzer when dropout has occurred in block, to control the buzzer sounding.
In addition, to achieve the above object, the present invention also provides a kind of signal loss detection device of four-way optical module, institutes
The signal loss detection device for stating four-way optical module includes the signal loss detection circuit of four-way optical module as described above.
The signal loss detection circuit of four-way optical module of the present invention passes through voltage conversion circuit for four-way optical module
The current signal that light-receiving component is exported is converted to voltage signal, then carries out AD sampling to the voltage signal by MCU,
The AD value and preset dropout judgment threshold that MCU and basis sample, judge whether the four-way optical module has occurred
Dropout, and corresponding control signal is exported to the letter when determining the four-way optical module and dropout having occurred
Number lost condition output device, to control the dropout state output device to the dropout of the four-way optical module
State carries out output and shows, i.e., the present invention is that the signal acquisition to the four-way optical module, place are realized by hardware circuit
Reason and analysis judgement, greatly improve the judgment accuracy to four-way optical module dropout；Also, the present invention also has
The advantages of structure is simple and easily realizes.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the functional block diagram of one embodiment of signal loss detection circuit of four-way optical module of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of signal loss detection circuit of four-way optical module, believes for improving four-way optical module
Number lose judgment accuracy.
Fig. 1 is the functional block diagram of one embodiment of signal loss detection circuit of four-way optical module of the present invention, ginseng
According to Fig. 1, in the present embodiment, the signal loss detection circuit 100 of the four-way optical module includes voltage conversion circuit 101, MCU
102 and dropout state output device 103.
Wherein, the voltage conversion circuit 101, what the light-receiving component 200 for acquiring four-way optical module was exported
Current signal, and the current signal is converted into voltage signal；
The MCU 102, the voltage signal for exporting to the voltage conversion circuit 101 carry out AD sampling, and
According to the AD value and preset dropout judgment threshold sampled, judge whether the four-way optical module has occurred signal and lose
It loses, and exports corresponding control signal to the dropout when determining the four-way optical module and dropout having occurred
State output device 103, to control the dropout state output device 103 to the dropout of the four-way optical module
State carries out output and shows；
In the present embodiment, the light-receiving component 200 of the four-way optical module, for the light-receiving component will to be input to
200 optical signal is converted to the current signal.
It is understood that in the present embodiment, the preset dropout judgment threshold can according to the actual situation into
Row setting judges the four-way when the AD value that the MCU 102 is sampled is less than the preset dropout judgment threshold
Dropout has occurred in road optical module, when the AD value that the MCU 102 is sampled is greater than or equal to the preset dropout
When judgment threshold, judge that dropout does not occur for the four-way optical module.The present embodiment determines described in the MCU 102
When dropout has occurred in four-way optical module, the MCU 102 exports corresponding control signal to the dropout state
Output device 103, to control the dropout state output device 103 to the dropout state of the four-way optical module
Output is carried out to show.
Further, the signal loss detection circuit 100 of the present embodiment four-way optical module further includes sampling hold circuit
104, the sampling hold circuit 104, the voltage signal for exporting to the voltage conversion circuit 101 carries out signal holding,
So that the voltage signal keeps stablizing.
Further, the signal loss detection circuit 100 of the present embodiment four-way optical module further includes filter circuit 105,
The voltage signal that the filter circuit 105 is used to export the sampling hold circuit 104 is filtered, so as to be input to
The voltage signal of the ADC interface of the MCU 102 is completely stable voltage signal.
In the present embodiment, the light-receiving of the signal input part of the voltage conversion circuit 101 and the four-way optical module
The signal output end of component 200 connects, the signal output end of the voltage conversion circuit 101 and the sampling hold circuit 104
Signal input part connection, the signal output end of the sampling hold circuit 104 is through the filter circuit and 105 MCU
102 ADC interface connection, the dropout state output device 103 are connect with the I/O port of the MCU 102.
In the present embodiment, the dropout state output device 103 is indicator light, and the MCU 102 is determining
When stating four-way optical module dropout has occurred, corresponding control signal is exported to the indicator light, to control the instruction
Lamp is lighted, i.e., in the present embodiment when the indicator light is illuminating state, illustrates that the four-way optical module has occurred signal and loses
It loses.It is understood that in other embodiments, the dropout state output device 103 can also be buzzer, work as institute
When to state dropout state output device 103 be buzzer, the MCU 102 is had occurred determining the four-way optical module
When dropout, corresponding control signal is exported to the buzzer, to control the buzzer sounding, i.e., when the buzzer
When sounding, illustrate that dropout has occurred in the four-way optical module.
The signal loss detection circuit of four-way optical module of the present invention, firstly, the voltage conversion circuit 101 acquire it is described
The current signal that the light-receiving component 200 of four-way optical module is exported, and the current signal is converted into voltage signal, by
It is substantially fixation in responsiveness of the same light-receiving component 200 to optical signal, the light of varying strength inputs the light and connects
Current signal is converted optical signals to by the photodiode (not shown) in the light-receiving component 200 when receiving component 200,
And the response current can follow the luminous intensity of institute's input optical signal and linear change；Then, the sampling hold circuit 104 is right
The voltage signal that the voltage conversion circuit 101 exports carries out signal holding, so that the voltage signal keeps stablizing；Then,
The voltage signal that the filter circuit 105 exports the sampling hold circuit 104 is filtered, so as to be input to described
The voltage signal of the ADC interface of MCU 102 is completely stable voltage signal；It is connect finally, 102 couples of the MCU inputs its ADC
Mouthful voltage signal carry out AD sampling, and according to the AD value and preset dropout judgment threshold sampled, described in judgement
Whether four-way optical module has occurred dropout, and the output when determining the four-way optical module and dropout having occurred
Corresponding control signal is lost to the dropout state output device 103 (indicator light or buzzer) with controlling the signal
Mistake state output device 103 carries out output to the dropout state of the four-way optical module and shows.
It is exported by the light-receiving component 200 that signal source in this present embodiment comes from the four-way optical module
Current signal (response current of the i.e. described light-receiving component 200), the current signal is most original and untreated mistake
Signal, therefore the accuracy of the signal source in the present embodiment and sensitivity are all very high；The present embodiment is again described due to being provided with
Sampling hold circuit 104, therefore the present embodiment can guarantee that the MCU 102 is adjudicating whether the four-way optical module occurs
Output level will not be caused unstable and the accuracy of influence judgement due to the variation fluctuation that do not stop of input signal when dropout,
And the present embodiment can also be by the flexible setting of the sampling retention time to the sampling hold circuit 104, with simultaneous simultaneously
The sensitivity of signal stabilization and response is cared for, and then realizes that stable alarm is sluggish；Meanwhile the filtered electrical in the present embodiment
Road 105 can guarantee that the voltage signal for being input to the ADC interface of the MCU 102 is completely stable voltage signal, so that this
Embodiment is to the setting of the preset dropout judgment threshold and the judgement of the dropout to the four-way optical module
It is all more accurate；Also, the signal loss detection circuit of the present embodiment four-way optical module, which is acted upon by temperature changes, also to be compared
It is small, to further increase the judgment accuracy to four-way optical module dropout.
In conclusion the signal loss detection circuit of the present embodiment four-way optical module is to be realized by hardware circuit pair
Signal acquisition, processing and the analysis judgement of the four-way optical module, greatly improve to four-way optical module dropout
Judgment accuracy；Also, the signal loss detection circuit of the present embodiment four-way optical module also has structure simple and easily real
Existing advantage.
The present invention also provides a kind of signal loss detection device of four-way optical module, the signal of the four-way optical module is lost
Lose the signal loss detection circuit that detection device includes four-way optical module, the signal loss detection circuit of the four-way optical module
Structure can refer to above-described embodiment, details are not described herein.Naturally, due to the letter of the four-way optical module of the present embodiment
Number loss detection device uses the technical solution of the signal loss detection circuit of above-mentioned four-way optical module, therefore the four-way
The beneficial effect that the signal loss detection device of optical module has the signal loss detection circuit of above-mentioned four-way optical module all.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (7)
1. a kind of signal loss detection circuit of four-way optical module, which is characterized in that the signal of the four-way optical module is lost
Slowdown monitoring circuit of lapsing includes voltage conversion circuit, MCU and dropout state output device；Wherein：
The voltage conversion circuit, the current signal that the light-receiving component for acquiring the four-way optical module is exported, and
The current signal is converted into voltage signal；
The MCU for carrying out AD sampling to the voltage signal, and sentences according to the AD value and preset dropout that sample
Disconnected threshold value, judges whether the four-way optical module has occurred dropout, and occurs determining the four-way optical module
The corresponding control signal of output is to the dropout state output device when dropout, to control the dropout shape
State output device carries out output to the dropout state of the four-way optical module and shows；
The light-receiving component of the four-way optical module, it is described for being converted to the optical signal for being input to the light-receiving component
Current signal.
2. the signal loss detection circuit of four-way optical module as described in claim 1, which is characterized in that the four-way light
The signal loss detection circuit of module further includes：
Sampling hold circuit, the voltage signal for exporting to the voltage conversion circuit carries out signal holding, so that the electricity
Signal is pressed to keep stablizing.
3. the signal loss detection circuit of four-way optical module as claimed in claim 2, which is characterized in that the four-way light
The signal loss detection circuit of module further includes：
Filter circuit, the voltage signal for exporting to the sampling hold circuit are filtered, so as to be input to described
The voltage signal of MCU is completely stable voltage signal.
4. the signal loss detection circuit of four-way optical module as claimed in claim 3, which is characterized in that the voltage conversion
The signal input part of circuit is connect with the signal output end of the light-receiving component of the four-way optical module, the voltage conversion electricity
The signal output end on road is connect with the signal input part of the sampling hold circuit, the signal output end of the sampling hold circuit
It is connect through the filter circuit with the ADC interface of the MCU, the I/O port of the dropout state output device and the MCU
Connection.
5. the signal loss detection circuit of four-way optical module according to any one of claims 1 to 4, which is characterized in that
The dropout state output device is indicator light, and the MCU loses determining the four-way optical module signal has occurred
Corresponding control signal is exported when mistake to the indicator light, is lighted with controlling the indicator light.
6. the signal loss detection circuit of four-way optical module according to any one of claims 1 to 4, which is characterized in that
The dropout state output device is buzzer, and the MCU loses determining the four-way optical module signal has occurred
Corresponding control signal is exported when mistake to the buzzer, to control the buzzer sounding.
7. a kind of signal loss detection device of four-way optical module, which is characterized in that the signal of the four-way optical module is lost
Lose the signal loss detection circuit that detection device includes four-way optical module described in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810640981.4A CN108880671A (en) | 2018-06-20 | 2018-06-20 | The signal loss detection circuit and device of four-way optical module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810640981.4A CN108880671A (en) | 2018-06-20 | 2018-06-20 | The signal loss detection circuit and device of four-way optical module |
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| CN108880671A true CN108880671A (en) | 2018-11-23 |
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| CN201810640981.4A Pending CN108880671A (en) | 2018-06-20 | 2018-06-20 | The signal loss detection circuit and device of four-way optical module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824505A (en) * | 2020-06-19 | 2021-12-21 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114257301A (en) * | 2021-12-20 | 2022-03-29 | 四川华拓光通信股份有限公司 | Method for improving optical module optical signal loss debugging precision |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594184A (en) * | 2009-06-11 | 2009-12-02 | 青岛海信宽带多媒体技术有限公司 | A kind of optical line terminal |
| US20100086315A1 (en) * | 2008-10-03 | 2010-04-08 | Sumitomo Electric Industries, Ltd. | Optical receiver able to prevent los alarm from malfunctioning |
| CN102394694A (en) * | 2011-11-02 | 2012-03-28 | 成都优博创技术有限公司 | RSSI (received signal strength indicator) monitoring circuit with high sampling accuracy |
| CN102427388A (en) * | 2011-12-08 | 2012-04-25 | 深圳市共进电子股份有限公司 | Reset current compensation type sudden receiving optical power monitor |
| CN102752045A (en) * | 2012-07-20 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module for optical network unit |
| CN102768389A (en) * | 2012-07-31 | 2012-11-07 | 青岛海信宽带多媒体技术有限公司 | Light active coupling system and method of optical module |
| CN203554449U (en) * | 2013-11-07 | 2014-04-16 | 青岛海信宽带多媒体技术有限公司 | SFP+LRM optical module capable of warning about loss of signal |
| CN106301584A (en) * | 2015-05-22 | 2017-01-04 | 青岛海信宽带多媒体技术有限公司 | Optical module and differential electric signal output circuit |
| CN106375058A (en) * | 2016-09-09 | 2017-02-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN106452575A (en) * | 2016-11-01 | 2017-02-22 | 武汉恒泰通技术有限公司 | SFP+ optical module having signal loss alarm function |
-
2018
- 2018-06-20 CN CN201810640981.4A patent/CN108880671A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100086315A1 (en) * | 2008-10-03 | 2010-04-08 | Sumitomo Electric Industries, Ltd. | Optical receiver able to prevent los alarm from malfunctioning |
| CN101594184A (en) * | 2009-06-11 | 2009-12-02 | 青岛海信宽带多媒体技术有限公司 | A kind of optical line terminal |
| CN102394694A (en) * | 2011-11-02 | 2012-03-28 | 成都优博创技术有限公司 | RSSI (received signal strength indicator) monitoring circuit with high sampling accuracy |
| CN102427388A (en) * | 2011-12-08 | 2012-04-25 | 深圳市共进电子股份有限公司 | Reset current compensation type sudden receiving optical power monitor |
| CN102752045A (en) * | 2012-07-20 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module for optical network unit |
| CN102768389A (en) * | 2012-07-31 | 2012-11-07 | 青岛海信宽带多媒体技术有限公司 | Light active coupling system and method of optical module |
| CN203554449U (en) * | 2013-11-07 | 2014-04-16 | 青岛海信宽带多媒体技术有限公司 | SFP+LRM optical module capable of warning about loss of signal |
| CN106301584A (en) * | 2015-05-22 | 2017-01-04 | 青岛海信宽带多媒体技术有限公司 | Optical module and differential electric signal output circuit |
| CN106375058A (en) * | 2016-09-09 | 2017-02-01 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN106452575A (en) * | 2016-11-01 | 2017-02-22 | 武汉恒泰通技术有限公司 | SFP+ optical module having signal loss alarm function |
Non-Patent Citations (1)
| Title |
|---|
| 李永忠: "《现代微机原理与接口技术》", 30 October 2013 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824505A (en) * | 2020-06-19 | 2021-12-21 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN114257301A (en) * | 2021-12-20 | 2022-03-29 | 四川华拓光通信股份有限公司 | Method for improving optical module optical signal loss debugging precision |
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