CN105406912B - The RSSI of optical line terminal with APD reports compensation circuit structure - Google Patents

The RSSI of optical line terminal with APD reports compensation circuit structure Download PDF

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Publication number
CN105406912B
CN105406912B CN201510980171.XA CN201510980171A CN105406912B CN 105406912 B CN105406912 B CN 105406912B CN 201510980171 A CN201510980171 A CN 201510980171A CN 105406912 B CN105406912 B CN 105406912B
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China
Prior art keywords
apd
resistance
circuit
rssi
triode
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CN201510980171.XA
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CN105406912A (en
Inventor
仵允贤
居健
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Shanghai Gongjin Communication Technology Co Ltd
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Shanghai Gongjin Communication Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

Abstract

The present invention relates to a kind of RSSI of optical line terminal with APD to report compensation circuit structure, wherein circuit structure includes booster circuit and the image current source circuit being connected with the voltage source, the input terminal of image current source circuit is connected with the output end of APD, the output end of the image current source circuit is connected with RSSI sample circuit, and thermistor and resistance R3 are also connected between the booster circuit and image current source circuit.Compensation circuit structure is reported using the RSSI of the optical line terminal with APD of this kind of structure, the dark current below high low normal temp is compensated by way of increasing a normal resistance and thermistor, error is reported to be modified as caused by high/low temperature dark current difference APD, it can be used and precision is reported to meet normal use standard, there is wider application range.

Description

The RSSI of optical line terminal with APD reports compensation circuit structure
Technical field
The present invention relates to technical field of photo communication, more particularly to improve RSSI in receiving end and the technology of accuracy is reported to lead Domain, in particular to a kind of RSSI of the optical line terminal with APD report compensation circuit structure.
Background technique
Passive optical network technique PON (Passive Optical Network: passive optical-fiber network) is a kind of point-to-multipoint Soft exchange technology, be realize " unification of three nets " and solve information superhighway " last one kilometer " best transmission medium, have There is the Integrated services access function of data, voice and video.Passive optical network refers to ODN (Optical Distribution Network: optical distribution) in do not contain any electronic device and electronic power supply, ODN is all by optical splitter (Splitter) etc. Passive device composition, does not need valuable active electronic devices.One passive optical network includes one and is installed on console for centralized control Optical line terminal (OLT), and the matched optical network unit (ONUs) for being installed on customer site of a batch.OLT and ONU it Between optical distribution (ODN) contain optical fiber and passive optical splitters or coupler.
For current passive optical network, the either OLT of local side or the 0NU of user side, require to use light Electric conversion equipment has the receiving end that optical signal is received for connecting optical fiber, i.e. light-receiving group inside photoelectric conversion device Part.In the case where most current cost constantly reduces, a kind of novel silicon base CMOS avalanche photodide (APD) device meet the tendency of and Raw, this New-type CMOS APD has the advantages such as breakdown voltage consistency is good, price is low, but is lacked due to more technical at present It falls into and is compared with the APD that present batch uses, dark current differs greatly in high/low temperature, to the mirror of optical module mirror low current source Image current impacts, to influence whether the received RSSI of optical module (Received Signal Strength Indication, the instruction of received signal intensity) optical power reports.
The booster circuit generallyd use at present has several ways, is broadly divided into DC-DC booster circuit chip and separate type liter Volt circuit, the main distinction is that the former is integrated into mirror image power circuit inside chip, and the latter needs an additional mirror image electricity Circuit in a steady stream, common mirror current source examples of circuits such as Fig. 1, configures according to resistance value in figure, and Iapd and Irssi are that 1:1 is closed System, after excluding triode temperature characterisitic difference, it is believed that Iapd=Irssi.
Wherein Iapd includes the dark current Iapd_dark of the practical photoelectric current Iapd_real that APD is generated and APD generation, i.e., Iapd=Iapd_real+Iapd_dark, it is assumed that Iapd_real=10uA immobilizes, and surveys from one group of CMOS APD high/low temperature Try data such as table 1, it can be seen that since the dark current in the face at high temperature APD is larger, RSSI monitoring deviation is caused to reach 5.59dB, The standard that GPON RSSI reports +/- 2dB is not met.
Table 1
Temperature -40C 25C 85C Unit
Iapd_dark 0.45 4.45 26.23 uA
Iapd 10.45 14.45 36.23 uA
Erro_Irssi 0.19 1.6 5.59 Erro_Irssi=10 × log (Iapd/10)
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, providing one kind can be realized increase by one normally The mode of resistance and thermistor is inclined come the precision for compensating to the dark current below high low normal temp, realizing that modified R/S SI is reported The RSSI of optical line terminal poor, with broader applications range with APD reports compensation circuit structure.
To achieve the goals above, the RSSI of the optical line terminal with APD of the invention reports compensation circuit structure to have There is following composition:
The RSSI of the optical line terminal with APD reports compensation circuit structure, is mainly characterized by, the structure packet The image current source circuit for including booster circuit and being connected with the voltage source, the input terminal of the image current source circuit It is connected with the output end of APD, the output end of the image current source circuit is connected with RSSI sample circuit, the liter Thermistor and resistance R3 are also connected between volt circuit and image current source circuit.
Preferably, the image current source circuit includes resistance R1, resistance R2, triode T1 and triode T2, it is described Triode T1 be connected with the base stage of triode T2, the triode T1 is connected to first end and the institute of the resistance R1 Between the APD stated, the triode T2 is connected between the first end and the RSSI sample circuit of the resistance R2, The second end of the resistance R1 and the second end of resistance R2 are connected to the booster circuit, the base of the triode T1 Pole is connected with the APD.
More preferably, the resistance value of the resistance R1 is equal to the resistance value of resistance R2.
More preferably, the resistance R3 and thermistor are connected between the triode T1 and booster circuit.
Compensation circuit structure is reported using the RSSI of the optical line terminal with APD in the invention, by increasing by one A normal resistance and the mode of thermistor compensate the dark current below high low normal temp, to APD since high/low temperature is dark It reports error to be modified caused by current difference, can be used and precision is reported to meet normal use standard, have wider Application range.
Detailed description of the invention
Fig. 1 is the circuit diagram of the light-receiving component with APD.
Fig. 2 is that the RSSI of the optical line terminal with APD of the invention reports the structural schematic diagram of compensation circuit structure.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention Description.
The purpose of the present invention is to provide a kind of novel compensation circuit, by increasing a normal resistance and thermistor Mode compensates the dark current below high low normal temp, to realize the accuracy error that modified R/S SI is reported, provides one kind Compensate practice weekly notes such as Fig. 2.
Test data such as table 2 after compensation,
Table 2
From the above test data can, using thermistor power-up resistance by the way of report electric current correctly to be mended RSSI It repays, greatly improves and report precision, so as to reach standard requirements.
To achieve the goals above, the RSSI of the optical line terminal with APD of the invention reports compensation circuit structure packet The image current source circuit for including booster circuit and being connected with the voltage source, the input terminal of the image current source circuit It is connected with the output end of APD, the output end of the image current source circuit is connected with RSSI sample circuit, the liter Thermistor and resistance R3 are also connected between volt circuit and image current source circuit.
In a kind of preferable embodiment, the image current source circuit includes resistance R1, resistance R2, triode T1 It is connected with triode T2, the triode T1 with the base stage of triode T2, the triode T1 is connected to the electricity Between the first end and the APD for hindering R1, the triode T2 is connected to the first end of the resistance R2 and described Between RSSI sample circuit, the second end of the resistance R1 and the second end of resistance R2 are connected to the booster circuit, The base stage of the triode T1 is connected with the APD.
In a kind of more preferably embodiment, the resistance value of the resistance R1 is equal to the resistance value of resistance R2.
In a kind of more preferably embodiment, the resistance R3 and thermistor are connected to the triode T1 and rise Between volt circuit.
Compensation circuit structure is reported using the RSSI of the optical line terminal with APD in the invention, by increasing by one A normal resistance and the mode of thermistor compensate the dark current below high low normal temp, to APD since high/low temperature is dark It reports error to be modified caused by current difference, can be used and precision is reported to meet normal use standard, have wider Application range.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative And not restrictive.

Claims (4)

1. a kind of RSSI of the optical line terminal with APD reports compensation circuit structure, which is characterized in that the circuit structure Including booster circuit and the image current source circuit being connected with voltage source, the input terminal of the image current source circuit with The output end of APD is connected, and the output end of the image current source circuit is connected with RSSI sample circuit, the boosting Thermistor and resistance R3 are also connected between circuit and image current source circuit, by increase thermistor and resistance R3 come pair Dark current below high low normal temp compensates, and reports error to be modified as caused by high/low temperature dark current difference APD, It can be used and precision is reported to meet normal use standard.
2. the RSSI of the optical line terminal according to claim 1 with APD reports compensation circuit structure, feature exists In, the image current source circuit include resistance R1, resistance R2, triode T1 and triode T2, the triode T1 and The base stage of triode T2 is connected, and the triode T1 is connected between the first end and the APD of the resistance R1, The triode T2 is connected between the first end and the RSSI sample circuit of the resistance R2, the resistance R1 Second end and the second end of resistance R2 be connected to the booster circuit, the base stage of the triode T1 and described APD is connected.
3. the RSSI of the optical line terminal according to claim 2 with APD reports compensation circuit structure, feature exists In the resistance value of the resistance R1 is equal to the resistance value of resistance R2.
4. the RSSI of the optical line terminal according to claim 2 with APD reports compensation circuit structure, feature exists In the resistance R3 and thermistor are connected between the triode T1 and booster circuit.
CN201510980171.XA 2015-12-23 2015-12-23 The RSSI of optical line terminal with APD reports compensation circuit structure Active CN105406912B (en)

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Publication number Priority date Publication date Assignee Title
CN106504513B (en) * 2017-01-09 2023-08-18 上海胤祺集成电路有限公司 Infrared receiving circuit
WO2019080036A1 (en) * 2017-10-26 2019-05-02 Shenzhen Xpectvision Technology Co., Ltd. A radiation detector capable of noise handling
CN108469868A (en) * 2018-06-07 2018-08-31 博为科技有限公司 Temperature self-adaptation current source and optical module
CN111800190A (en) * 2020-06-03 2020-10-20 武汉电信器件有限公司 Signal intensity calibration method and device of optical module based on avalanche photodiode

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CN1516362A (en) * 2003-01-02 2004-07-28 三星电子株式会社 Temperature compensating equipment for avalanche photodiode optical receiver
CN201429467Y (en) * 2009-06-26 2010-03-24 深圳新飞通光电子技术有限公司 Detection circuit for APD burst incident light strength
CN103067076A (en) * 2012-12-27 2013-04-24 武汉华工正源光子技术有限公司 Detection circuit of optical module burst luminous power
CN104753590A (en) * 2013-12-26 2015-07-01 青岛海信宽带多媒体技术有限公司 Optical module

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Publication number Priority date Publication date Assignee Title
CN1516362A (en) * 2003-01-02 2004-07-28 三星电子株式会社 Temperature compensating equipment for avalanche photodiode optical receiver
CN201429467Y (en) * 2009-06-26 2010-03-24 深圳新飞通光电子技术有限公司 Detection circuit for APD burst incident light strength
CN103067076A (en) * 2012-12-27 2013-04-24 武汉华工正源光子技术有限公司 Detection circuit of optical module burst luminous power
CN104753590A (en) * 2013-12-26 2015-07-01 青岛海信宽带多媒体技术有限公司 Optical module

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