CN104579497A - Burst light receiving circuit - Google Patents
Burst light receiving circuit Download PDFInfo
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- CN104579497A CN104579497A CN201310482306.0A CN201310482306A CN104579497A CN 104579497 A CN104579497 A CN 104579497A CN 201310482306 A CN201310482306 A CN 201310482306A CN 104579497 A CN104579497 A CN 104579497A
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Abstract
The invention provides a burst light receiving circuit. The burst light receiving circuit comprises a photodiode biasing circuit, a photodiode, a first-rate TIA (trans-impedance amplifier), a second-rate LA (line amplifier) and a low-pass filter circuit, wherein the first rate is higher than the second rate; the low-pass filter circuit is located between an output end of the first-rate TIA and an input end of the second-rate LA; the first rate is 2.5 G, and the second rate is 1.25 G to be matched with the first rate, so that a 1.25 G burst light receiving circuit with the low frequency spectrum loss is formed; the first rate can also be 4 G, and the second rate is 2.5 G to be matched with the first rate, so that a 2.5 G burst light receiving circuit with the low frequency spectrum loss is formed. The rate of the TIA is higher than that of the LA, and the output end of the high-rate TIA is connected with the low-pass filter circuit, so that the burst receiving bandwidth of an OLT (optical line terminal) optical transceiver module is guaranteed, and the saturation index of a burst light receiving module is improved finally.
Description
Technical field
The present invention relates to a kind of passive optical network optical line terminal OLT optical transceiver module, particularly relate to a kind of burst optical receiving circuit of OLT optical transceiver module.
Background technology
Along with the development of economic society and the communication technology, the requirement of people to information communication increases day by day.FTTX intelligent acess technology be promote access speed with expand the specific direction of network capacity, passive optical network PON (Passive Optical Network is called for short PON) ripe gradually is in recent years a realistic plan.PON is by the optical line terminal OLT (Optical Line Terminal is called for short OLT) of local side, the optical network unit ONU (Optical Network Unit is called for short ONU) of user side and the ODN formation connecting these nodes.The main feature of PON is to multiple spot (conventional optical network is point-to-point), and its advantage is N family user sharing fiber, and only needs N+1 optical module (traditional point to point network is 2N optical module), and network and equipment cost can significantly reduce.Downlink data adopts broadcast mode to issue multiple ONU from OLT, the letter head that each bag carries is the identification data specific ONU that will arrive uniquely, data flow is divided into N road independent signal through beam splitter, every road signal is all containing the packet issuing all specific ONU, when ONU receives data flow, only extract the packet issuing oneself, will the data packet discarding of other ONU be issued.Upstream data is transmitted by Time Division Multiplexing mode shared channel, each ONU distributes a transmission time slot, time slot is synchronous, interference can not be produced between the packet ensureing different ONU, ONU in user side receives the continuous signal that OLT launches, so its reception is continuously-running duty, and the treatment technology of continuously-running duty is comparative maturity relative to burst reception working method.But for the OLT of local side, adopt burst reception working method, the light signal that burst reception performance sends for ONU/ONT is more responsive, if there is deterioration in the light signal that ONU/ONT sends in production or use procedure, to directly cause the burst reception hydraulic performance decline of OLT optical transceiver module, so the requirement that OLT burst reception adaptability exists lifting and improves.In prior art, as shown in Figure 1, the 1.25G burst optical receiving circuit 100 of OLT optical transceiver module, speed is normally selected to be that the TIA of 1.25Gb/s mates the LA scheme of 1.25Gb/s, comprise: an APD biasing circuit 110, one APD120, one 1.25G TIA amplifier 130 and one second speed LA amplifier 140, APD biasing circuit 110 is reverse-biased high-tension circuits of APD, be added on after APD protective circuit on APD120, APD converts light signal to current signal, amplify through 1.25G TIA amplifier 130 and convert voltage to output, again through receiving amplitude limit second speed LA amplifier 140, export after amplifying.This burst mode receiver, when ONU/ONT optical signal spectrum deficiency or the disappearance of up input, will directly cause the burst reception output duty cycle distortion of OLT optical transceiver module, OLT receives saturated hydraulic performance decline.
Summary of the invention
For overcoming above shortcoming, the invention provides a kind of frequency spectrum and losing little burst optical receiving circuit.
For reaching above goal of the invention, the invention provides a kind of burst optical receiving circuit, comprise: a photodiode biasing circuits, a photodiode, a first rate TIA amplifier and one second speed LA amplifier, described first rate is greater than the second speed, between described first rate TIA amplifier out and the second speed LA amplifier in, also comprise a low-pass filter circuit.
Described first rate is 2.5G, and the second speed is 1.25G.
Described first rate is 4G, and the second speed is 2.5G.
Described low-pass filter circuit is a RC resistance capacitance filter circuit.
Described low-pass filter circuit is a LC inductance capacitor filtering circuit.
Described low-pass filter circuit is an active filter circuit.
Due in the burst optical receiving circuit of said structure, the speed that have employed TIA amplifier is greater than LA amplifier speed, and the output of large speed TIA amplifier connects a low-pass filter circuit, to ensure the burst reception bandwidth of OLT optical transceiver module, finally reach and improve burst Optical Receivers saturation index.
Accompanying drawing explanation
Fig. 1 represents prior art 1.25G burst optical receiving circuit schematic diagram;
Fig. 2 represents 1.25G of the present invention burst optical receiving circuit schematic diagram.
Embodiment
Preferred embodiment is described in detail below in conjunction with accompanying drawing.
Burst optical receiving circuit 200 as shown in Figure 2, comprise: photodiode biasing circuits 210, photodiode PD220, first rate TIA amplifier 230 and an one second speed LA amplifier 240, described first rate is greater than the second speed, between described first rate TIA amplifier 230 output and the second speed LA amplifier 240 input, also comprise a low-pass filter circuit 250.Wherein, photodiode PD220 can be PIN or APD photodiode.First rate is 2.5G, and the second speed is that 1.25G matches, and forms frequency spectrum and loses little 1.25G burst optical receiving circuit; Also can be first rate be 4G, the second speed be that 2.5G matches, and forms frequency spectrum and loses little 2.5G and to happen suddenly optical receiving circuit.Low-pass filter circuit 250 is a RC resistance capacitance filter circuit, a LC inductance capacitor filtering circuit or an active filter circuit.Photodiode biasing circuits 210 provides bias current for photodiode PD220, photodiode PD220 will receive light signal and be converted to photoelectric current, by first rate TIA amplifier 230 by this current conversion amplification voltage signal, it exports amplification voltage signal through low-pass filter circuit 250, signal is amplified buffering, output voltage signal through the second speed LA amplifier 240 by its filtered output signals more further.
The burst optical receiving circuit 200 of said structure, by increasing front end receiver bandwidth, exporting in rear class simultaneously and increasing low pass filter, to ensure light delivery module bandwidth, finally reaches improvement burst Optical Receivers saturated.
Proposition one is improved a saturated method of OLT burst Optical Receivers by the present invention.But except OLT burst Optical Receivers, its application also extends to other non-burst mode optical modules, such as: continuous mode optical module, or other acyclic optical modules receive application products.
Claims (6)
1. burst optical receiving circuit (200), comprise: a photodiode biasing circuits (210), a photodiode PD(220), a first rate TIA amplifier (230) and one second speed LA amplifier (240), it is characterized in that, described first rate is greater than the second speed, be positioned between described first rate TIA amplifier (230) output and the second speed LA amplifier (240) input, also comprise a low-pass filter circuit (250).
2. burst optical receiving circuit (200) according to claim 1, is characterized in that, described first rate is 2.5G, and the second speed is 1.25G.
3. burst optical receiving circuit (200) according to claim 1, is characterized in that, described first rate is 4G, and the second speed is 2.5G.
4. the burst optical receiving circuit (200) according to Claims 2 or 3, is characterized in that, described low-pass filter circuit (250) is a RC resistance capacitance filter circuit.
5. the burst optical receiving circuit (200) according to Claims 2 or 3, is characterized in that, described low-pass filter circuit (250) is a LC inductance capacitor filtering circuit.
6. the burst optical receiving circuit (200) according to Claims 2 or 3, is characterized in that, described low-pass filter circuit (250) is an active filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482306.0A CN104579497A (en) | 2013-10-16 | 2013-10-16 | Burst light receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482306.0A CN104579497A (en) | 2013-10-16 | 2013-10-16 | Burst light receiving circuit |
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| Publication Number | Publication Date |
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| CN104579497A true CN104579497A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310482306.0A Pending CN104579497A (en) | 2013-10-16 | 2013-10-16 | Burst light receiving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276673A (en) * | 2017-07-14 | 2017-10-20 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN108847897A (en) * | 2018-08-03 | 2018-11-20 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN112117743A (en) * | 2020-10-12 | 2020-12-22 | 武汉海达数云技术有限公司 | APD protection circuit and laser scanner |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552647A (en) * | 2008-04-03 | 2009-10-07 | 华为技术有限公司 | Method and device for receiving optical signals |
| CN101854212A (en) * | 2010-05-13 | 2010-10-06 | 成都优博创技术有限公司 | Dual-rate optical signal receiving device |
-
2013
- 2013-10-16 CN CN201310482306.0A patent/CN104579497A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552647A (en) * | 2008-04-03 | 2009-10-07 | 华为技术有限公司 | Method and device for receiving optical signals |
| CN101854212A (en) * | 2010-05-13 | 2010-10-06 | 成都优博创技术有限公司 | Dual-rate optical signal receiving device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276673A (en) * | 2017-07-14 | 2017-10-20 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN108847897A (en) * | 2018-08-03 | 2018-11-20 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN108847897B (en) * | 2018-08-03 | 2021-05-28 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| CN112117743A (en) * | 2020-10-12 | 2020-12-22 | 武汉海达数云技术有限公司 | APD protection circuit and laser scanner |
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Legal Events
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170526 Address after: 518101, Guangdong, Shenzhen Baoan District Xian two road COFCO Business Park 2, 1503 Applicant after: Shenzhen Apat Optoelectronics Components Co., Ltd. Address before: South South technology 12 road 518057 in Guangdong province Shenzhen city Nanshan District high tech Industrial Park, No. 8 Frestech. Applicant before: Shenzhen Neo Photonic Technology Co., Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |