CN203896358U - Self-resetting burst-type light receiving circuit - Google Patents
Self-resetting burst-type light receiving circuit Download PDFInfo
- Publication number
- CN203896358U CN203896358U CN201420230628.6U CN201420230628U CN203896358U CN 203896358 U CN203896358 U CN 203896358U CN 201420230628 U CN201420230628 U CN 201420230628U CN 203896358 U CN203896358 U CN 203896358U
- Authority
- CN
- China
- Prior art keywords
- burst
- circuit
- network
- resetting
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model provides a self-resetting burst-type light receiving circuit. The circuit comprises a burst-type trans-impedance amplifier, an RC network, a burst-type limiting amplifier, a time-delay circuit and a switching circuit, which are connected in turn, wherein the switching circuit is connected with the RC network. According to the self-resetting burst-type light receiving circuit provided by the utility model, a signal output by the limiting amplifier is used as an enable signal of the switching circuit, and the RC network with a small time constant is controlled to rapidly discharge in a lead code period through adjustment of the time-delay circuit, to enable a burst receiver to stably establish a threshold level under the condition of a shorter lead code; a rapid charge-discharge circuit is broken off during a valid data period so as to ensure that high and low frequency signals can smoothly pass AC coupling capacitors; the burst receiving circuit is simple in structure, externally-arranged complicated resetting sequence signals are not required, and the bandwidth usage efficiency of upstream burst signals is effective raised.
Description
Technical field
The utility model relates to optical receiving circuit, and concrete is a kind of Self-resetting burst type optical receiving circuit.
Background technology
Known, PON(EPON) one preferred technique as the large bandwidth access of user has been deployed in the broadband access network of all parts of the world more and more, and it transmits means for user provides a kind of lower deployment cost large bandwidth low and that flexibility is high.Along with the quickening of " light entering and copper back " paces and the proposition of national broadband strategy, Fiber to the home for FTTH(both domestic and external) obtain large scale deployment and continued to keep the situation of blowout.
OLT(optical line terminal) optic electric interface module is the kernel component of PON system, burst-mode receiver technology is the core technology of this module, this technology is all the time by external only a few manufacturer's grasp and monopolization, cause the lower deployment cost of this optical-electric module always high, improved the construction cost of broadband access network.At present PON system mainly adopts GPON(Gigabit Passive Optical Network) and the EPON of EPON(based on Ethernet) two kinds of modes, GPON has advantages of that lead code is short, expense is few, so efficiency is high, but the external reset signal cooperating of needs.EPON has advantages of technology maturation simple in structure, but owing to there is no external reset signal, and lead code must reach the stable of certain length guarantee burst incoming level, and this also brings the shortcoming that expense is large.
In the AC coupled mode optical receiver extensively adopting now, being positioned at optical module limits the common mode electrical level of putting circuit input end to necessarily require to complete at short notice level equalization, naturally the time that discharges and recharges of the RC network of simple dependence circuit self obviously can not meet the demands, and must adopt additional reset signal to force to shorten the level equalization time.
But some EPON users require to shorten preamble length to reach the object of raising the efficiency, this just require optical module can be under shorter lead code condition level also can fast and stable, generally take to reduce the method for coupling capacitance capacitance, but this can introduce sensitivity penalty and reduce burst receptivity.
Utility model content
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of Self-resetting burst type optical receiving circuit, comprise the burst type trans-impedance amplifier, RC network, burst type limiting amplifier, delay circuit and the switching circuit that connect successively, described switching circuit is connected with RC network.
Described RC network comprises capacitor C 1, C2, resistance R 1, R2, R3 and R4, described capacitor C 1, C2 one end are connected with burst type trans-impedance amplifier, capacitor C 1 other end connects resistance R in parallel 1, R4, capacitor C 2 other ends connect resistance R in parallel 2, R3, described R1, R2 access Vref, and R3, R4 access Vref through switching circuit.
Described burst type limiting amplifier is SY88149 type burst type limiting amplifier.
The beneficial effects of the utility model are: the utility model utilizes the signal of limiting amplifier output as the enable signal of switching circuit, by the adjustment of delay circuit, control little time constant RC network and during lead code, carry out fast charging and discharging, make burst receiver also can stably set up threshold level under shorter lead code condition; During valid data, disconnect fast charging and discharging circuit, guarantee that low-and high-frequency signal can pass through ac coupling capacitor smoothly; This burst mode receiver is simple in structure, without the reset timing signal of external complexity, can effectively improve the bandwidth availability ratio of uplink burst signal.
Accompanying drawing explanation
Fig. 1. be the utility model embodiment frame structure schematic diagram;
In figure: 10-burst type trans-impedance amplifier; 20-RC network; 30-burst type limiting amplifier; 40-delay circuit; 50-switching circuit.
embodiment
Below in conjunction with further describing the technical program with reference to accompanying drawing, the example of described embodiment is shown in the drawings, wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish, but this description is only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
As Fig. 1, a kind of Self-resetting burst type optical receiving circuit, it is characterized in that: comprise the burst type trans-impedance amplifier 10, RC network 20, burst type limiting amplifier 30, delay circuit 40 and the switching circuit 50 that connect successively, described switching circuit 50 is connected with RC network 20.
Described RC network 20 comprises capacitor C 1, C2, resistance R 1, R2, R3 and R4, described capacitor C 1, C2 one end are connected with burst type trans-impedance amplifier 10, capacitor C 1 other end connects resistance R in parallel 1, R4, capacitor C 2 other ends connect resistance R in parallel 2, R3, described R1, R2 access Vref, and R3, R4 are through switching circuit 50 access Vref, and described Vref is same reference voltage source.
Choosing of described burst type limiting amplifier 30 had to certain requirement, SD semaphore request can overturn fast (such as SY88149, SD signal gets up only needs several nanoseconds, when unglazed input, can within tens nanoseconds, reset, the requirement of the satisfied EPON based on Ethernet to preamble length and guard time far away).
The operation principle of described Self-resetting burst mode receiver structure of the present utility model is:
This burst type trans-impedance amplifier 10 is a fixed span impedance amplifier, the burst luminous signal of input is carried out to linearity to be amplified, the signal of telecommunication of output is coupled into the input of burst type limiting amplifier 30 through ac coupling capacitor C1 and C2, in the guard time of burst luminous signal, SD signal level is low, shows now not detect light signal, and switching circuit 50 is in closure state, whole RC network, in low resistive state, is waited for the arrival of burst luminous signal.R3, R4 and C1, C2 form little time constant RC network, can carry out fast charging and discharging to capacitor C 1 and capacitor C 2, and this charge and discharge process is during lead code.Because lead code is 1 and 0 signal replacing, frequency is higher, and now the capacitor value of C1, C2 is less, and fast charging and discharging process can be carried out rapidly, waits for the arrival of burst luminous signal.When the lead code of burst luminous signal arrives, because SD signal does not uprise, whole RC network, in fast charging and discharging state, can make threshold level stable within a short period of time.When the SD of limiting amplifier signal uprises, SD signal makes it control switch circuit disconnect, at this moment RC network is in large time constant state, R1, R2 and C1, C2 form large time constant RC network, make the data code flow of various spectrum components can pass through coupling capacitance, circuit has more strongly continuous same code (CID) handling capacity, and fast charging and discharging process finishes.Delay circuit 40 is mainly used to regulate the fast charging and discharging time of RC network 20, and fast charging and discharging overlong time is too short is all disadvantageous to the work of burst mode receiver.Fast charging and discharging deficiency of time is set up the common mode electrical level that causes limit to put input unstable, and fast charging and discharging overlong time will cause switch also not cut off fast charging and discharging road in effective data intervals making low frequency signal cannot pass through ac coupling capacitor.
In sum, be only the preferred embodiment of the utility model, with this, do not limit protection range of the present utility model, all equivalences of doing according to the utility model the scope of the claims and description change and modify, within being all the scope that the utility model patent contains.
Claims (2)
1. a Self-resetting burst type optical receiving circuit, it is characterized in that: comprise the burst type trans-impedance amplifier (10), RC network (20), burst type limiting amplifier (30), delay circuit (40) and the switching circuit (50) that connect successively, described switching circuit (50) is connected with RC network (20); Described RC network (20) comprises capacitor C 1, C2, resistance R 1, R2, R3 and R4, described capacitor C 1, C2 one end are connected with burst type trans-impedance amplifier (10), capacitor C 1 other end connects resistance R in parallel 1, R4, capacitor C 2 other ends connect resistance R in parallel 2, R3, described R1, R2 access Vref, and R3, R4 are through switching circuit (50) access Vref.
2. a kind of Self-resetting burst type optical receiving circuit according to claim 1, is characterized in that: described burst type limiting amplifier (30) is SY88149 type burst type limiting amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420230628.6U CN203896358U (en) | 2014-05-07 | 2014-05-07 | Self-resetting burst-type light receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420230628.6U CN203896358U (en) | 2014-05-07 | 2014-05-07 | Self-resetting burst-type light receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203896358U true CN203896358U (en) | 2014-10-22 |
Family
ID=51722710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420230628.6U Expired - Fee Related CN203896358U (en) | 2014-05-07 | 2014-05-07 | Self-resetting burst-type light receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203896358U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540231A (en) * | 2017-12-14 | 2018-09-14 | 武汉电信器件有限公司 | A kind of adaptive OLT optical modules and its control method |
-
2014
- 2014-05-07 CN CN201420230628.6U patent/CN203896358U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540231A (en) * | 2017-12-14 | 2018-09-14 | 武汉电信器件有限公司 | A kind of adaptive OLT optical modules and its control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106330323B (en) | OLT optical module and OLT | |
| CN103595473B (en) | Burst reception control circuit and burst mode optical receiver | |
| CN107517087B (en) | Optical module | |
| CN102347794B (en) | Burst light signal receiving apparatus | |
| US9496826B2 (en) | Transimpedance amplifier | |
| CN104995835B (en) | Happen suddenly optical receiver, happen suddenly optical receiver avalanche photodide bias voltage control method | |
| CN103166714B (en) | Signal supervisory instrument based on burst mode optical receiver | |
| CN103023575B (en) | Optical burst receiving circuit for GPON LOTs (gigabit passive optical network optical line terminals) | |
| CN103178905B (en) | Optical module and burst luminous signal thereof receive circuit | |
| CN105432030B (en) | Current-to-voltage converting circuit, optical receiver and optical terminal device | |
| CN106100723B (en) | A kind of optical module | |
| CN203896358U (en) | Self-resetting burst-type light receiving circuit | |
| CN106330337B (en) | Burst receiver restoring circuit and optical module | |
| KR100703428B1 (en) | Burst-mode optical receiver and power level detector in an for receiving burst-mode signal therefor | |
| CN203387515U (en) | An outburst reception control circuit and an outburst mode optical receiver | |
| CN203708261U (en) | Burst-mode optical receiving circuit structure capable of adapting to different reset timing sequences | |
| CN106656323B (en) | A kind of passive optical network burst-mode receiver signal deteching circuit device and method | |
| CN103095369A (en) | Rapid signal detection circuit | |
| CN104022832B (en) | A kind of difference A-C coupled modes optical signal receiving circuit | |
| CN103281116B (en) | A kind of ONU long luminescence detection circuits and application system and its application process | |
| CN203313191U (en) | Burst receiving detection circuit of gigabit-capable PON (passive optical network) | |
| CN102325281B (en) | Device and method for processing received signal strength indicator (RSSI) Trigger time sequence of optical module of optical line terminal (OLT) by utilizing programmable logic cell | |
| CN106059669A (en) | Light receiving module | |
| CN104467381B (en) | A kind of intermediate frequency power supply IGCT Fiber isolation drive circuit | |
| CN203632673U (en) | Emergent reception detection circuit and optical line terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141022 Termination date: 20160507 |