CN201750416U - Receiving light power monitoring circuit of light transmit-receive module - Google Patents
Receiving light power monitoring circuit of light transmit-receive module Download PDFInfo
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- CN201750416U CN201750416U CN2010205324983U CN201020532498U CN201750416U CN 201750416 U CN201750416 U CN 201750416U CN 2010205324983 U CN2010205324983 U CN 2010205324983U CN 201020532498 U CN201020532498 U CN 201020532498U CN 201750416 U CN201750416 U CN 201750416U
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Abstract
The utility model provides a receiving light power monitoring circuit of light transmit-receive module comprising a photoelectric diode PD, a first, second PNP-type triode, and a first sampling resistance. The base electrodes of the first, second PNP-type triode are connected together, beside, two emitter electrodes and a power supply VCC are in a parallel connection to form a current mirror circuit. The negative pole of the photoelectric diode PD is connected with the collector of the first PNP-type triode, and the positive pole is grounded. One end of the first sampling resistance as the first sampling point 1 is connected with the collector of the second PNP-type triode, and the other end is grounded. The utility model also comprises an operational amplifier, an isolation resistance, an input resistance and a feedback resistance. One end of the isolation resistance is connected with the positive input end of the operational amplifier, the other end is connected with the collector of the second PNP-type triode. One end of the input resistance is connected with the negative input end of the operational amplifier, and the other end is grounded. The feedback resistance is connected between the negative input end and the output end of the operational amplifier, and the output end of the operational amplifier is the second sampling point 2. The utility model can be used for increasing the dynamic range of the light power.
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 connects the first positive-negative-positive transistor collector, its plus earth; 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 an operational amplifier, an isolation resistance, an input resistance and a feedback resistance, the positive input terminal of an end concatenation operation amplifier of described isolation resistance, the other end connects the collector electrode of the second positive-negative-positive triode; The negative input end of one end concatenation operation amplifier of described input resistance, other end ground connection; Described feedback resistance is connected between the negative input end and output of operational amplifier, and the output of operational amplifier (30) is second sampled point 2.
The span 0.1K Ω～10K Ω of described first sampling resistor.
Described Vcc gets 3.3V or 5V.
In the technique scheme because two sampled points are arranged, when receiving small-signal, use the output of operational amplifier like this, when receiving large-signal, then use the output of first sampling resistor, 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 positive-negative-positive triode can also adopt integrated circuit (IC) chip to realize, whole monitoring circuit is 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, the base stage and the collector electrode of the first positive-negative-positive triode 10 link together, and form current mirror circuit, and Vcc gets 3.3V or 5V.The negative electrode of photodiode PD60 connects the first positive-negative-positive triode, 10 collector electrodes, its plus earth.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 an operational amplifier 30, an isolation resistance 50, an input resistance 70 and a feedback resistance 80, the positive input terminal of one end concatenation operation amplifier 30 of isolation resistance 50, the other end connects the collector electrode of the second positive-negative-positive triode 20; The negative input end of one end concatenation operation amplifier 30 of input resistance 70, other end ground connection; Feedback resistance 80 is connected between the negative input end and output of operational amplifier 30, and the output of operational amplifier 30 is second sampled point 2, its sampled voltage V
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 both base stages of first, second positive-negative- positive triode 10,20 and the collector electrode of the first positive-negative-positive triode 10 link together, and have formed circuit mirror current, therefore the collector current of two 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 output voltage V of operational amplifier 30
2=V
1.R4/R3 (R4 represents the resistance of feedback resistance 80, and R3 represents the resistance of input resistance 70).R4 is set greater than R3, multiplication factor is determined according to the dynamic range of received power.Use the output voltage V of operational amplifier 30 like this during small-signal
2Come output, just improved the precision that monitors as DDM.And when the electric current I of photodiode PD
PDVery big, when promptly received optical power is very big, 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 input voltage range that has exceeded analog to digital converter.
Wherein the span of first sampling resistor 40 is 0.1K Ω～10K Ω, the multiplication factor of operational amplifier is R4/R3, suppose to monitor the received optical power scope for-29dBm to-4dBm, (29dBm=0.00125mW ,-4dBm=0.158mW) R4 and the value of R3 be than just being about: 0.158/0.00125=126.According to the resistance size that just can determine R3 and R4 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 positive-negative- positive triode 10,20 wherein both can also adopt integrated circuit (IC) chip to realize, method is simple more.
Claims (3)
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) connects first positive-negative-positive triode (10) collector electrode, its plus earth; 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 an operational amplifier (30), an isolation resistance (50), an input resistance (70) and a feedback resistance (80), the positive input terminal of one end concatenation operation amplifier (30) of described isolation resistance (50), the other end connects the collector electrode of the second positive-negative-positive triode (20); The negative input end of one end concatenation operation amplifier (30) of described input resistance (70), other end ground connection; Described feedback resistance (80) is connected between the negative input end and output of operational amplifier (30), and the output of operational amplifier (30) is second sampled point 2.
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).
3. the received optical power monitoring circuit of optical transceiver module according to claim 2 is characterized in that, described Vcc gets 3.3V or 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205324983U CN201750416U (en) | 2010-09-15 | 2010-09-15 | Receiving light power monitoring circuit of light transmit-receive module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205324983U CN201750416U (en) | 2010-09-15 | 2010-09-15 | Receiving light power monitoring circuit of light transmit-receive module |
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| CN201750416U true CN201750416U (en) | 2011-02-16 |
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| CN2010205324983U Expired - Lifetime CN201750416U (en) | 2010-09-15 | 2010-09-15 | Receiving light power monitoring circuit of light transmit-receive module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437876A (en) * | 2012-01-04 | 2012-05-02 | 武汉华工正源光子技术有限公司 | RSSI circuit for OLT optical module in passive optical network |
| 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 |
| CN102857298A (en) * | 2012-04-25 | 2013-01-02 | 索尔思光电（成都）有限公司 | Circuit and method for monitoring power parameter in optical module |
| CN103259391A (en) * | 2012-02-21 | 2013-08-21 | 凹凸电子（武汉）有限公司 | Load driving circuit, power converter and controller |
| CN103647606A (en) * | 2013-11-26 | 2014-03-19 | 上海斐讯数据通信技术有限公司 | GPON terminal transmitting-receiving-integrated optical assembly with RSSI function |
-
2010
- 2010-09-15 CN CN2010205324983U patent/CN201750416U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437876A (en) * | 2012-01-04 | 2012-05-02 | 武汉华工正源光子技术有限公司 | RSSI circuit for OLT optical module in passive optical network |
| CN102437876B (en) * | 2012-01-04 | 2014-08-13 | 武汉华工正源光子技术有限公司 | RSSI (Received Signal Strength Indicator) circuit used for OLT (Optical Line Terminal) optical module in passive optical network |
| CN103259391A (en) * | 2012-02-21 | 2013-08-21 | 凹凸电子（武汉）有限公司 | Load driving circuit, power converter and controller |
| CN102857298A (en) * | 2012-04-25 | 2013-01-02 | 索尔思光电（成都）有限公司 | Circuit and method for monitoring power parameter in optical module |
| CN102857298B (en) * | 2012-04-25 | 2015-10-21 | 索尔思光电（成都）有限公司 | The circuit of monitor power parameter and method in optical module |
| 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 |
| CN103647606A (en) * | 2013-11-26 | 2014-03-19 | 上海斐讯数据通信技术有限公司 | GPON terminal transmitting-receiving-integrated optical assembly with RSSI function |
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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 |
Effective date of registration: 20170612 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. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110216 |
|
| CX01 | Expiry of patent term |