CN103259591A - GPON OLT module RSSI fast sampling circuit - Google Patents
GPON OLT module RSSI fast sampling circuit Download PDFInfo
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- CN103259591A CN103259591A CN2013101448468A CN201310144846A CN103259591A CN 103259591 A CN103259591 A CN 103259591A CN 2013101448468 A CN2013101448468 A CN 2013101448468A CN 201310144846 A CN201310144846 A CN 201310144846A CN 103259591 A CN103259591 A CN 103259591A
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Abstract
The invention provides a GPON OLT module RSSI fast sampling circuit which comprises a DC-DC boosting circuit, an image tube U8, a sampling resistor R23, an APD biasing circuit, an optical receiver assembly, an RC compensating circuit, an operating circuit, a sampling hold circuit and a single-chip microcomputer with an ADC interface. The DC-DC boosting circuit is connected with the input end of the image tube U8. The output end of the image tube U8 is respectively connected with the input end of the APD biasing circuit, the input end of the optical receiver assembly and the input end of the RC compensating circuit. The image tube U8 is connected with the sampling resistor R23. The RC compensating circuit is connected with the sampling hold circuit through the operating circuit. The sampling hold circuit is connected with the single-chip microcomputer with the ADC interface. The fast sampling circuit has the advantages that due to the effect of the RC compensating circuit and the APD biasing circuit, the sampling speed is increased effectively, time sequences of GPON OLT can be configured more flexibly, and engineering application is more convenient.
Description
Technical field
The present invention relates to photodetection, small-signal detection, relate in particular to a kind of GPON OLT module RSSI quick sampling circuit in photodetection, the small-signal detection.
Background technology
Along with IPTV/TriplePlay, MMS (Multimedia Message Service), the P2P Video service, the demand of Video Applications such as high-resolution video monitoring and high speed Internet access etc. are from the demand of professional aspect, improving constantly of the diversification that broadband services is used and bandwidth demand, intelligent terminal generally uses professional appearance such as wifi, Access Network promotes rapidly to the requirement of bandwidth, optical fiber inserts becomes best choice, and GPON(Gigabit-capable passive optical networks, Gigabit Passive Optical Network) be most effective a kind of in all Optical Access Networks, GPON has high bandwidth, high efficiency, along separate routes than big, numerous advantages such as large coverage, user interface enrich.
GPON ONU(Optical Network Unit, optical network unit) short and GPON OLT(Optical Line Termination of the burst time of emission, optical line terminal) time weak point reception GUARD TIME(guard time), these two foundation stones that " weak point " is the GPON system advantage.Owing to will satisfy along separate routes than big, these characteristics of rich interface are so the meeting that " communications packets " in the GPON system has is very short, in order to adapt to this characteristics, OLT holds the RSSI time also will lack just can better realize these characteristics, distributes more flexible to the sequential of ONU end.
The RSSI circuit of OLT end uses conventional sampling hold circuit usually, and the routine sampling holding circuit will just can be finished sampling with the time of 2us～5us, and such time can not well be satisfied the demand of GPON system.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of GPON OLT module RSSI quick sampling circuit.
The invention provides a kind of GPON OLT module RSSI quick sampling circuit, comprise the DC-DC booster circuit, mirror image pipe U8, sampling resistor R23, the APD biasing circuit, optical fiber receive module, the RC compensating circuit, computing circuit, sampling hold circuit and the single-chip microcomputer that has the ADC interface, wherein, described DC-DC booster circuit is connected with the input of described mirror image pipe U8, the output of described mirror image pipe U8 respectively with described APD biasing circuit, optical fiber receive module, the input of RC compensating circuit connects, described mirror image pipe U8 is connected with described sampling resistor R23, described RC compensating circuit is connected with described sampling hold circuit by described computing circuit, described sampling hold circuit is connected with the single-chip microcomputer of the described ADC of having interface, after light signal enters described optical fiber receive module, change into current signal, R23 changes into sampled voltage by sampling resistor, and the voltage that the sampled voltage that sampling resistor R23 changes into and RC compensating circuit produce enters sampling hold circuit through computing circuit.
As a further improvement on the present invention, described APD biasing circuit comprises the triode Q2 that forms constant-current source circuit, operational amplifier U12, resistance R 54, resistance R 45 and resistance R 50, the collector electrode of described triode Q2 is connected with the output of described mirror image pipe U8, described triode Q2 emitter respectively with an end of described resistance R 54, the inverting input of operational amplifier U12 connects, the base stage of described triode Q2 is connected with the output of described operational amplifier U12, the other end ground connection of described resistance R 54, the in-phase input end of described operational amplifier U12 respectively with described resistance R 45, one end of resistance R 50 connects, the other end ground connection of described resistance R 50, another termination reference voltage V ref of described resistance R 45.
As a further improvement on the present invention, be in series with resistance R 34 between described RC compensating circuit, the mirror image pipe U8.
As a further improvement on the present invention, be connected with the RC filter circuit between described computing circuit and the described sampling hold circuit.
The invention has the beneficial effects as follows: pass through such scheme, after light signal enters described optical fiber receive module, change into current signal, R23 changes into sampled voltage by sampling resistor, the voltage that the sampled voltage that sampling resistor R23 changes into and RC compensating circuit produce enters sampling hold circuit through computing circuit, because the effect of RC compensating circuit and APD biasing circuit makes sample rate effectively be promoted, the sequential configuration of GPON OLT is more flexible, and engineering is used convenient.
Description of drawings
Fig. 1 is the theory diagram of a kind of GPON OLT of the present invention module RSSI quick sampling circuit;
Fig. 2 is the circuit diagram of a kind of GPON OLT of the present invention module RSSI quick sampling circuit.
Embodiment
The present invention is further described below in conjunction with description of drawings and embodiment.
Drawing reference numeral among Fig. 1 to Fig. 2 is: DC-DC booster circuit 101; APD biasing circuit 102; ROSA 103; RC compensating circuit 104; Computing circuit 105; Sampling hold circuit 106; The single-chip microcomputer 107 that has the ADC interface.
Extremely shown in Figure 2 as Fig. 1, a kind of GPON OLT module RSSI quick sampling circuit, comprise DC-DC booster circuit 101, mirror image pipe U8, sampling resistor R23, APD biasing circuit 102(APD:Avalanche Photo Diode, avalanche photodide), optical fiber receive module, RC compensating circuit 104, computing circuit 105, sampling hold circuit 106 and have ADC interface (ADC:Analog-to-Digital Converter, A/D converter) single-chip microcomputer 107, wherein, optical fiber receive module is ROSA 103(ROSA:Receiver Optical Subassembly, optical fiber receive module), described DC-DC booster circuit 101 is connected with the input of described mirror image pipe U8, the output of described mirror image pipe U8 respectively with described APD biasing circuit 102, optical fiber receive module, the input of RC compensating circuit 104 connects, described mirror image pipe U8 is connected with described sampling resistor R23, described RC compensating circuit 104 is connected with described sampling hold circuit 106 by described computing circuit 105, described sampling hold circuit 106 is connected with the single-chip microcomputer 107 of the described ADC of having interface, after light signal enters described optical fiber receive module (ROSA 103), change into current signal, R23 changes into sampled voltage by sampling resistor, and the voltage that the sampled voltage that sampling resistor R23 changes into and RC compensating circuit 104 produce enters sampling hold circuit 106 through computing circuit 105.
Extremely shown in Figure 2 as Fig. 1, described APD biasing circuit 102 comprises the triode Q2 that forms constant-current source circuit, operational amplifier U12, resistance R 54, resistance R 45 and resistance R 50, the collector electrode of described triode Q2 is connected with the output of described mirror image pipe U8, described triode Q2 emitter respectively with an end of described resistance R 54, the inverting input of operational amplifier U12 connects, the base stage of described triode Q2 is connected with the output of described operational amplifier U12, the other end ground connection of described resistance R 54, the in-phase input end of described operational amplifier U12 respectively with described resistance R 45, one end of resistance R 50 connects, the other end ground connection of described resistance R 50, another termination reference voltage V ref of described resistance R 45.
To shown in Figure 2, be in series with resistance R 34 between described RC compensating circuit 104, the mirror image pipe U8 as Fig. 1.
To shown in Figure 2, be connected with RC filter circuit between described computing circuit 105 and the described sampling hold circuit 106 as Fig. 1.
To shown in Figure 2, described sampling hold circuit 106 comprises operational amplifier U12, operational amplifier U16 and switch U6 as Fig. 1.
To shown in Figure 2, operational amplifier U12 is dual operational amplifier as Fig. 1.
A kind of GPON OLT module RSSI quick sampling circuit provided by the invention is to increase APD biasing circuit 102 and RC compensating circuit 104 at traditional sampling hold circuit 106, ROSA 103 is that photoelectricity transforms original paper, size and the electric current of the light that receives are directly proportional, so the size of light also is directly proportional with the sampling resistor R23 B of place point voltage, required drive current is provided by DC-DC booster circuit 101.
To shown in Figure 2, the constant-current source circuit that the APD biasing circuit is made up of triode Q2 and operational amplifier U12 can pass through the size of resistance R 54, resistance R 45,50 3 resistance adjustment electric currents of resistance R as Fig. 1.The main effect of APD biasing circuit, do not receive under the situation of light at ROSA 103 exactly, DC-DC booster circuit 101 also has a very little load, DC-DC booster circuit 101 operate as normal, under this state, ONU holds (Optical Network Unit, optical network unit) burst light is behind ROSA103, DC-DC booster circuit 101 can save the initialized time, response fast, the stable time of voltage at sampling resistor R23 place effectively shortens, and this circuit mainly has the burst sampling time of light time that the effect that shortens is arranged to unglazed change.
To shown in Figure 2, RC compensating circuit 104 is owing to the access of resistance R 34 as Fig. 1, and the voltage at node A place can become with the variation of sharing the same light sends out inversely proportional relation.When reception light becomes little light from big light, the A point voltage raises, the B point voltage reduces, because the existence of RC differential circuit, the C point voltage also can and then raise, and the C point is the negative pole access point of operational amplifier U16 amplifier, the anodal access point that its variation tendency and C are ordered is opposite, so at output, can accelerate trailing edge, make and export the corresponding voltage of the little light of faster arrival;
To shown in Figure 2, when reception light became big light from little light, the voltage that A is ordered reduced as Fig. 1, the voltage that B is ordered raises, and the C point voltage reduces, and the reduction of C point voltage can cause the pressure reduction of amplifier two-stage input to increase, the output rising edge is accelerated, reach the corresponding sampled voltage of big light sooner.
Extremely shown in Figure 2 as Fig. 1, effectively behind trigger signal (triggering signal) the input switch U6, sampled voltage can be by the mode to capacitor C 43 chargings, transfer to the D point, behind the switch closure, sampled voltage can effectively keep more than the 100us, allow the single-chip microcomputer 107 that has the ADC interface have adequate time to sample, the single-chip microcomputer 107 that has the ADC interface can carry out 16 samplings, averages, and can effectively increase the stability of sampling like this.
A kind of GPON OLT module RSSI quick sampling circuit provided by the invention, it is the circuit that is applied to test fast on the OLT product received optical power, can in 300ns, finish the sampling to luminous power, after light signal enters ROSA103, change into current signal, R23 changes into sampled voltage by sampling resistor, the voltage that produces with RC compensating circuit 104 then, through computing circuit 105, enter sampling hold circuit 106, because the effect of RC compensating circuit 104 and APD biasing circuit 102 makes sample rate effectively be promoted, the sequential configuration of GPON OLT is more flexible, and engineering is used convenient.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. GPON OLT module RSSI quick sampling circuit, it is characterized in that: comprise the DC-DC booster circuit, mirror image pipe U8, sampling resistor R23, the APD biasing circuit, optical fiber receive module, the RC compensating circuit, computing circuit, sampling hold circuit and the single-chip microcomputer that has the ADC interface, wherein, described DC-DC booster circuit is connected with the input of described mirror image pipe U8, the output of described mirror image pipe U8 respectively with described APD biasing circuit, optical fiber receive module, the input of RC compensating circuit connects, described mirror image pipe U8 is connected with described sampling resistor R23, described RC compensating circuit is connected with described sampling hold circuit by described computing circuit, described sampling hold circuit is connected with the single-chip microcomputer of the described ADC of having interface, after light signal enters described optical fiber receive module, change into current signal, R23 changes into sampled voltage by sampling resistor, and the voltage that the sampled voltage that sampling resistor R23 changes into and RC compensating circuit produce enters sampling hold circuit through computing circuit.
2. GPON OLT module RSSI quick sampling circuit according to claim 1, it is characterized in that: described APD biasing circuit comprises the triode Q2 that forms constant-current source circuit, operational amplifier U12, resistance R 54, resistance R 45 and resistance R 50, the collector electrode of described triode Q2 is connected with the output of described mirror image pipe U8, described triode Q2 emitter respectively with an end of described resistance R 54, the inverting input of operational amplifier U12 connects, the base stage of described triode Q2 is connected with the output of described operational amplifier U12, the other end ground connection of described resistance R 54, the in-phase input end of described operational amplifier U12 respectively with described resistance R 45, one end of resistance R 50 connects, the other end ground connection of described resistance R 50, another termination reference voltage V ref of described resistance R 45.
3. GPON OLT module RSSI quick sampling circuit according to claim 1 is characterized in that: be in series with resistance R 34 between described RC compensating circuit, the mirror image pipe U8.
4. GPON OLT module RSSI quick sampling circuit according to claim 1 is characterized in that: be connected with the RC filter circuit between described computing circuit and the described sampling hold circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310144846.8A CN103259591B (en) | 2013-04-24 | 2013-04-24 | GPON OLT module RSSI quick sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310144846.8A CN103259591B (en) | 2013-04-24 | 2013-04-24 | GPON OLT module RSSI quick sampling circuit |
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| CN103259591A true CN103259591A (en) | 2013-08-21 |
| CN103259591B CN103259591B (en) | 2016-02-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004033557A1 (en) * | 2002-10-04 | 2004-04-22 | Finisar Corporation | Method and apparatus for compensating a photo-detector |
| CN1717446A (en) * | 2002-10-04 | 2006-01-04 | 菲尼萨公司 | Method and apparatus for compensating a photo-detector |
| CN102437876A (en) * | 2012-01-04 | 2012-05-02 | 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 |
| CN202374268U (en) * | 2011-12-28 | 2012-08-08 | 深圳新飞通光电子技术有限公司 | OLT (Optical Line Terminal) module optical power detection circuit |
| CN203166918U (en) * | 2013-04-24 | 2013-08-28 | 深圳市极致兴通科技有限公司 | RSSI rapid sampling circuit of GPON OLT module |
-
2013
- 2013-04-24 CN CN201310144846.8A patent/CN103259591B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004033557A1 (en) * | 2002-10-04 | 2004-04-22 | Finisar Corporation | Method and apparatus for compensating a photo-detector |
| CN1717446A (en) * | 2002-10-04 | 2006-01-04 | 菲尼萨公司 | Method and apparatus for compensating a photo-detector |
| CN202374268U (en) * | 2011-12-28 | 2012-08-08 | 深圳新飞通光电子技术有限公司 | OLT (Optical Line Terminal) module optical power detection circuit |
| CN102437876A (en) * | 2012-01-04 | 2012-05-02 | 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 |
| CN203166918U (en) * | 2013-04-24 | 2013-08-28 | 深圳市极致兴通科技有限公司 | RSSI rapid sampling circuit of GPON OLT module |
Non-Patent Citations (1)
| Title |
|---|
| 陈辉: "仪表放大器的设计与制作", 《电子制作》, 31 July 2006 (2006-07-31), pages 58 - 59 * |
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Address after: 518000, Guangdong, Nanshan District, Taoyuan Shenzhen street, 1213 cents Xian Road, the crown Yao Ling Industrial Zone, 2 District, 7, 1-3, 1268 cents Xian Road, the crown of red ridge industrial north 4, 2 Building East Patentee after: XGIGA Communication Technology Co., Ltd. Address before: 518000, Guangdong, Nanshan District, Taoyuan province Shenzhen street, 1213 cents Xian Road, the crown Yao Ling Industrial Zone 2, 7, 1-3 Patentee before: XGIGA Communication Technology Co., Ltd. |
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Address after: 518000 room a1101201 301 401 501, building 13, Junfeng Industrial Park, Chongqing Road, Heping community, Fuhai street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: XGIGA Communication Technology Co., Ltd. Address before: 518000, Guangdong, Nanshan District, Taoyuan Shenzhen street, 1213 cents Xian Road, the crown Yao Ling Industrial Zone, 2 District, 7, 1-3, 1268 cents Xian Road, the crown of red ridge industrial north 4, 2 Building East Patentee before: XGIGA Communication Technology Co., Ltd. |