CN201750415U - Optical power receiving monitoring circuit for optical transceiving module - Google Patents
Optical power receiving monitoring circuit for optical transceiving module Download PDFInfo
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- CN201750415U CN201750415U CN201020532488XU CN201020532488U CN201750415U CN 201750415 U CN201750415 U CN 201750415U CN 201020532488X U CN201020532488X U CN 201020532488XU CN 201020532488 U CN201020532488 U CN 201020532488U CN 201750415 U CN201750415 U CN 201750415U
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Abstract
The utility model provides an optical power receiving monitoring circuit for an optical transceiving module, comprising a photodiode PD, a first and a second PNP type triodes, and a first sampling resistance, the base electrodes of the first and the second PNP type triodes are connected, the two emitter electrodes are in a parallel connection with a power supply VCC, forming a current mirror circuit; three ends of the negative electrode of the photodiode PD, the collector electrode of the first PNP type triode, and the base electrode of the first PNP type triode are connected, the positive electrode of the photodiode PD is connected to the ground; one end of the first sampling resistance as the first sampling point I is connected with the collector electrode of the second PNP type triode, the other end is connected to the ground; the optical power receiving monitoring circuit also comprises a third PNP type triode and a second sampling resistance, the base electrode and the emitter electrode of the third PNP type triode are respectively connected with the base electrode and the emitter electrode of the second PNP type triode, one end of the second sampling resistance as the second sampling point is connected with the collector electrode of the third PNP type triode, the other end is connected to the ground; since the first and the second sampling resistances are disposed, wide dynamic range of the optical power receiving monitoring circuit for the optical transceive module can be realized.
Description
Technical field
The utility model relates to a kind of optical receiving circuit of optical transceiver module, relates in particular to a kind of received optical power monitoring circuit of optical transceiver module.
Background technology
Along with the fast development of optical-fibre communications industry, the optical transceiver module that photoelectricity, electric light are changed is mutually used also more and more, and system manufacturer is also more and more higher to the requirement of optical transceiver module.In a large amount of optical transmission systems that use, a lot of base stations are arranged on the open air or even away from the place of the signs of human habitation, this just makes optical transmission system must possess from monitoring and reporting functions.For optical transceiver module in the system, also must possess from function for monitoring.Wherein to the requirement of optical-electric module also from the initial mutual translation function of just finishing photoelectricity, electric light to providing numerical diagnostic to monitor DDM (digital diagnostics monitoring, be called for short DDM) function, from basic DDM to high accuracy, the DDM of wide dynamic range.The DDM function of optical transceiver module need provide several systems to be concerned about, is convenient to the parameter that lost efficacy and locate.Wherein received optical power is a very important parameter in the optical transceiver module, the operating state of this parameter meeting help system location Transmission Fibers.
The monitoring circuit of the received optical power of at present the most frequently used optical transceiver module as shown in Figure 1, comprise a photodiode PD6, first, second positive-negative- positive triode 1,2 and a sampling resistor 4, two positive-negative-positive triodes form current mirror circuit, wherein two emitters and meet power supply V
CC, the negative electrode of photodiode PD6 connects the first positive-negative-positive triode, 1 collector electrode, its plus earth; One end of sampling resistor 4 connects the collector electrode of the second positive-negative-positive triode 2, other end ground connection as sampled point.This kind circuit is realized simple, but the dynamic range of received optical power narrow (＜20dB), at the edge near dynamic range, it monitors that precision can not guarantee.
Summary of the invention
In order to overcome above shortcoming, the utility model provides a kind of received optical power monitoring circuit of optical transceiver module of wide dynamic range.
For reaching above goal of the invention, the utility model provides a kind of received optical power monitoring circuit of optical transceiver module, comprise a photodiode PD, first, second positive-negative-positive triode and first sampling resistor, the base stage of first, second positive-negative-positive triode is connected, and two emitters also meet power supply V
CC, form current mirror circuit; The negative electrode of photodiode PD, the first positive-negative-positive transistor collector and base stage three ends are connected the plus earth of photodiode PD; One end of first sampling resistor is as the collector electrode of first sampled point, 1 connection, the second positive-negative-positive triode, other end ground connection; Also comprise one the 3rd positive-negative-positive triode and second sampling resistor, the base stage of described the 3rd positive-negative-positive triode, emitter are connected with emitter with the base stage of the second positive-negative-positive triode respectively, one end of described second sampling resistor connects the collector electrode of the 3rd positive-negative-positive triode, other end ground connection as second sampled point.
The span 0.1K Ω～10K Ω of described first sampling resistor, the span 10K Ω～200K Ω of second sampling resistor.
The span 10K Ω～200K Ω of described first sampling resistor, the span 0.1K Ω～10K Ω of second sampling resistor.
Described Vcc gets 3.3V or 5V.
Collector electrode owing to the second and the 3rd positive-negative-positive triode in the technique scheme is respectively equipped with first, second sampling resistor, when receiving small-signal, then use big multiplication factor like this, when receiving large-signal, then use little multiplication factor, adopt this kind method to be equivalent to widen the scope of sampled power, promptly strengthened optical transceiver module the received optical power dynamic range (＞25dB), reduced resolution requirement, improved the supervision precision analog to digital converter.And wherein first, second can also adopt integrated circuit (IC) chip to realize with the 3rd positive-negative-positive triode, and whole monitoring circuit is more simple and convenient.
Description of drawings
Fig. 1 represents the received optical power monitoring circuit of prior art optical transceiver module.
Fig. 2 represents the received optical power monitoring circuit of the utility model optical transceiver module.
Embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
The received optical power monitoring circuit of optical transceiver module as shown in Figure 2, comprise a photodiode PD60, first, second positive-negative- positive triode 10,20 and first sampling resistor 40, the base stage of first, second positive-negative- positive triode 10,20 is connected, and two emitters also meet power supply V
CC, forming current mirror circuit, Vcc gets 3.3V or 5V.The negative electrode of photodiode PD60, the first positive-negative-positive triode, 10 collector electrodes are connected the plus earth of photodiode PD60 with base stage three ends.One end of first sampling resistor 40 connects the collector electrode of the second positive-negative-positive triode 20 as first sampled point 1, other end ground connection, and set the first sampled voltage V of first sampled point 1
1In addition, the monitoring circuit of this received optical power also comprises one the 3rd positive-negative-positive triode 30 and second sampling resistor 50, the base stage of the 3rd positive-negative-positive triode 30, emitter are connected with emitter with the base stage of the second positive-negative-positive triode 20 respectively, one end of second sampling resistor 50 connects the collector electrode of the 3rd positive-negative-positive triode 30 as second sampled point 2, other end ground connection, and set the second sampled voltage V of second sampled point 2
2
During operate as normal, the flow through transmitting terminal of the first positive-negative-positive triode 10 of electric current, because the negative electrode of photodiode PD60 connects the collector electrode of the first positive-negative-positive triode 10, photodiode PD60 is anti-inclined to one side, then photodiode PD60 operate as normal and certain photoelectric current is arranged.Because first, second, third positive-negative-positive triode, 10,20,30 threes' base stage and emission collection are connected to together, therefore the collector current of three triodes equates.
Electric current I as photodiode PD
PDVery little, when promptly received optical power is very little, the first sampled voltage V of first sampling resistor 40
1=I
PD.R1 (I wherein
PDThe flow through electric current of photodiode PD of expression, R1 represents the resistance of first sampling resistor 40); The second sampled voltage V of second sampling resistor 50
2=I
PD.R2 (R2 represents the resistance of first sampling resistor 40).Suppose first sampling resistor 40 less than second sampling resistor 50, promptly R1 is littler than R2, the second sampled voltage V
2As the output of DDM value, when small-signal, use big multiplication factor just to improve the precision that monitors like this.At this moment, the first sampled voltage V
1Easier other factor affecting such as noise that are subjected to.And when the electric current I of photodiode PD
PDVery big, same, R1 is than under the little situation of R2, when promptly received optical power is very big, and the first sampled voltage V
1Export as the DDM value.Like this, large-signal has just been reduced multiplication factor, and this moment the second sampled voltage V
2The supply voltage scope that has exceeded analog to digital converter.
Wherein when the span of first sampling resistor 40 was 0.1K Ω～10K Ω, then the span of second sampling resistor 50 was 10K Ω～200K Ω; Otherwise when the span of first sampling resistor 40 was 10K Ω～200K Ω, then the span of second sampling resistor 50 was 0.1K Ω～10K Ω.Suppose to monitor the received optical power scope for-29dBm to-4dBm, (29dBm=0.00125mW ,-4dBm=0.158mW) R1 and the value of R2 be than just being about: 0.158/0.00125=126.According to the resistance size that just can determine R1 and R2 accordingly.
When small-signal, use big multiplication factor, when large-signal, use little multiplication factor, be equivalent to widen the scope of sampled power in this way, promptly strengthened the dynamic range that received optical power monitors, reduced resolution requirement, improved the supervision precision analog to digital converter.And first, second, third positive-negative-positive triode, 10,20,30 threes wherein can also adopt integrated circuit (IC) chip to realize, method is simple more.
Claims (4)
1. the received optical power monitoring circuit of an optical transceiver module, comprise a photodiode PD (60), first, second positive-negative-positive triode (10,20) and first sampling resistor (40), the base stage of first, second positive-negative-positive triode (10,20) is connected, and two emitters also meet power supply V
CC, form current mirror circuit; The negative electrode of photodiode PD (60), first positive-negative-positive triode (10) collector electrode are connected the plus earth of photodiode PD (60) with base stage three ends; One end of first sampling resistor (40) is as the collector electrode of first sampled point, 1 connection, the second positive-negative-positive triode (20), other end ground connection; It is characterized in that, also comprise one the 3rd positive-negative-positive triode (30) and second sampling resistor (50), the base stage of described the 3rd positive-negative-positive triode (30), emitter are connected with emitter with the base stage of the second positive-negative-positive triode (20) respectively, one end of described second sampling resistor (50) is as the collector electrode of second sampled point, 2 connections the 3rd positive-negative-positive triode (30), other end ground connection.
2. the received optical power monitoring circuit of optical transceiver module according to claim 1 is characterized in that, the span 0.1K Ω～10K Ω of described first sampling resistor (40), the span 10K Ω～200K Ω of second sampling resistor (50).
3. the received optical power monitoring circuit of optical transceiver module according to claim 1 is characterized in that, the span 10K Ω～200K Ω of described first sampling resistor (40), the span 0.1K Ω～10K Ω of second sampling resistor (50).
4. according to the received optical power monitoring circuit of claim 2 or 3 described optical transceiver modules, it is characterized in that described Vcc gets 3.3V or 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020532488XU CN201750415U (en) | 2010-09-15 | 2010-09-15 | Optical power receiving monitoring circuit for optical transceiving module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020532488XU CN201750415U (en) | 2010-09-15 | 2010-09-15 | Optical power receiving monitoring circuit for optical transceiving module |
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| CN201750415U true CN201750415U (en) | 2011-02-16 |
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| CN201020532488XU Expired - Lifetime CN201750415U (en) | 2010-09-15 | 2010-09-15 | Optical power receiving monitoring circuit for optical transceiving module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102752046A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit, optical power detection device and optical power detection method |
| CN105897342A (en) * | 2016-06-03 | 2016-08-24 | 广州日铨电子有限公司 | Photo-electric transmission module and photo-electric transmission system |
| CN104734777B (en) * | 2013-12-23 | 2017-12-29 | 海思光电子有限公司 | Optical signal detecting control circuit |
-
2010
- 2010-09-15 CN CN201020532488XU patent/CN201750415U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102427388B (en) * | 2011-12-08 | 2014-06-04 | 深圳市共进电子股份有限公司 | Reset current compensation type sudden receiving optical power monitor |
| CN102752046A (en) * | 2012-07-23 | 2012-10-24 | 青岛海信宽带多媒体技术有限公司 | Optical module of optical network unit, optical power detection device and optical power detection method |
| CN104734777B (en) * | 2013-12-23 | 2017-12-29 | 海思光电子有限公司 | Optical signal detecting control circuit |
| CN105897342A (en) * | 2016-06-03 | 2016-08-24 | 广州日铨电子有限公司 | Photo-electric transmission module and photo-electric transmission system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170519 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Patentee after: Shenzhen Apat Optoelectronics Components Co., Ltd. Address before: South South technology twelve road 518057 in Guangdong Province, Shenzhen high tech Industrial Park, No. 8 Frestech. Patentee before: Shenzhen Neo Photonic Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110216 |