CN102497605B - Receiver circuit for optical module and optical module - Google Patents

Receiver circuit for optical module and optical module Download PDF

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CN102497605B
CN102497605B CN201110427265.6A CN201110427265A CN102497605B CN 102497605 B CN102497605 B CN 102497605B CN 201110427265 A CN201110427265 A CN 201110427265A CN 102497605 B CN102497605 B CN 102497605B
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receiver circuit
gate
optical
controlled switch
resistance
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CN102497605A (en
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张强
赵其圣
杨思更
何鹏
薛登山
薄生伟
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Hisense Broadband Multimedia Technology Co Ltd
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Hisense Broadband Multimedia Technology Co Ltd
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Abstract

The invention discloses a receiver circuit for an optical module and an optical module. The receiver circuit comprises a clipping amplifying unit, a first selection circuit unit and a second selection circuit unit, wherein a charging capacitor of the clipping amplifying unit is connected with an optical receiving assembly for transmitting an electric signal to the receiver circuit; one end of the first selection circuit unit is connected to a connecting line between a terminal of the clipping amplifying unit and a first charging capacitor which is connected with the terminal, and the other end of the first selection circuit unit is connected with a reference voltage source terminal of the clipping amplifying unit; and one end of the second selection circuit unit is connected with a connecting line between another terminal of the clipping amplifying unit and a second charging capacitor which is connected with the terminal, and the other end of the second selection circuit unit is connected with the reference voltage source terminal. Due to the adoption of the receiver circuit disclosed by the invention, the problem that compatibility of the receiver circuit cannot be realized due to processing of signals with different receiver circuits according to the requirements of an EPON (Ethernet Passive Optical Network) and a GPON (Gigabit Passive Optical Network) in the prior art is solved.

Description

Receiver circuit and optical module for optical module
Technical field
The present invention relates to optical communication technique field, specifically, relate to receiver circuit and optical module for optical module for Optical Access Network.
Background technology
At present, having on the market the optical line terminal optical module (OLT) for EPON (PON) of two different types, is respectively according to the ethernet passive optical network of IEEE protocol definition (EPON) optical line terminal optical module with according to gigabit passive optical network (GPON) the optical line terminal optical module of International Telecommunications Union (ITU-T) definition.Both are in the difference of physical layer: it is that the laser that 1.25Gb/s, wavelength are 1490nm sends continuous broadcast singal that EPON OLT adopts speed, and the speed that reception EPON optical network unit optical module (ONU) is sent is the burst luminous signal that 1.25Gb/s, wavelength are 1310nm; It is that the laser that 2.488Gb/s, wavelength are 1490nm sends continuous broadcast singal that GPON OLT adopts speed, and the speed that reception GPON ONU sends is the burst luminous signal that 1.25Gb/s, wavelength are 1310nm.
In EPON and GPON, optical fiber receive module in OLT optical module receives uplink optical signal, after being converted to the signal of telecommunication, light signal transfers to the receiver circuit in optical module, receiver circuit carries out limited range enlargement processing to the signal of telecommunication, then export the signal after amplifying, for intrasystem other modules that are connected by electrical interface with optical module.Because the optical module of different EPONs is different to the requirement of the signal of limited range enlargement, for example different to the requirement of the consecutive identical digital immunity to interference of signal, therefore, EPON and GPON need to adopt respectively different receiver circuits to process signal, cannot realize the compatibility of receiver circuit, so, limited the normalized of general light module, in different optical-fiber network application scenarios, must adopt different optical modules just can satisfy the demands, use inconvenience.
In addition, along with the needs of continuous progress and the broadband services dilatation of photoelectric technology, as the 10G EPON(10G ethernet passive optical network of Next Generation Access pattern) and XGPON(10,000,000,000 gigabit passive optical networks) already occurred.Wherein, 10G EPON, as the upgrade mode of EPON, disposes at compatible EPON on the basis of wavelength, has increased 10G bandwidth rates.10G EPON OLT optical module is according to the complexity of disposing, be divided into 2 ripple symmetrical expressions, 3 ripple asymmetrics and the 4 ripple dual rate formula isotype that coexists, and 4 ripple dual rate coexist, formula 10G EPON OLT optical module can compatible 2 ripple symmetrical expressions and the optical module of 3 ripple asymmetrics.The 4 ripple dual rate of the take formula 10G EPON OLT optical module that coexists is example, its up-downgoing speed and wavelength are respectively: adopting EML laser and the speed that 10.3125Gb/s, wavelength are 1577nm is the Distributed Feedback Laser that 1.25Gb/s, wavelength are 1490nm, send respectively continuous broadcast singal, give corresponding 10G ONU and 1G ONU; Reception wavelength is that bursty data signal and the wavelength that 1270nm, speed are 10.3125Gb/s is the bursty data signal that 1310nm, wavelength are 1.25Gb/s, carries out respectively signal processing.10G EPON disposes by wavelength cleverly, on the basis of compatible EPON, has realized the significantly lifting of bandwidth.
XGPON as ITU-T representative, in competition, do not give the impression of weakness yet, upgrade mode of future generation as GPON, in definition optical module, also consider and the compatibility of GPON, specifically, up-downgoing speed and the wavelength of XGPON OLT are: employing speed is that the EML laser that 9.953Gb/s, wavelength are 1577nm sends continuous broadcast singal, receiving velocity is the burst luminous signal that 2.488Gb/s, wavelength are 1270nm, has equally significantly promoted the network bandwidth.
But, for these the four kinds of optical-fiber networks of EPON, GPON, 10G EPON and XGPON that existed at present, each optical-fiber network adopts different OLT optical modules, under different optical-fiber network application scenarios, need to change different optical modules, change frequent, use inconvenience.And, owing to having multiple different optical module, need to deposit respectively and manage, expend a large amount of storage resources, human resources and management resource, cost is higher.
Summary of the invention
One of object of the present invention is to provide a kind of optical module receiver circuit, to solve EPON and GPON in prior art, need to adopt respectively different receiver circuits signal to be processed, cannot be realized the problem of receiver circuit compatibility.
For achieving the above object, the present invention adopts following technical proposals to be achieved:
An optical module receiver circuit, comprises limited range enlargement unit, and limited range enlargement unit has the positive and negative input terminal of differential signal and reference voltage source terminal; Differential signal positive input terminal is connected to the differential signal positive output terminal of the optical fiber receive module of receiver circuit transmission of electric signals by the first charging capacitor, differential signal negative input terminal connects the differential signal negative output terminal of optical fiber receive module by the second charging capacitor; Also comprise the first selection circuit unit and the second selection circuit unit, first selects circuit unit one end to be connected on the line between differential signal positive input terminal and the first charging capacitor, the other end connects reference voltage source terminal, second selects circuit unit one end to be connected on the connecting line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal;
First selects circuit unit to include the first resistance and the second resistance, and first resistance one end is connected on the line between differential signal positive input terminal and the first charging capacitor, and the other end connects reference voltage source terminal by the first gate-controlled switch; The second resistance and the 3rd gate-controlled switch formation in parallel parallel branch, one end of parallel branch is connected on the line between differential signal positive input terminal and the first charging capacitor, and the other end connects reference voltage source terminal by the second gate-controlled switch;
Second selects circuit unit to include the 3rd resistance and the 4th resistance, and the 3rd resistance one end is connected on the line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal by the 4th gate-controlled switch; The 4th resistance and the 6th gate-controlled switch formation in parallel parallel branch, one end of parallel branch is connected on the line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal by the 5th gate-controlled switch;
Conducting or shutoff, the 3rd gate-controlled switch and the 6th gate-controlled switch conducting or the shutoff under the control of gigabit passive optical network reset signal under the control of optical-fiber network selection control signal of the first gate-controlled switch, the second gate-controlled switch, the 4th gate-controlled switch and the 5th gate-controlled switch.
Receiver circuit as above, described the first gate-controlled switch and described the second gate-controlled switch adopt a single-pole double-throw switch (SPDT) to realize, and described the 4th gate-controlled switch and described the 5th gate-controlled switch adopt a single-pole double-throw switch (SPDT) to realize.
Receiver circuit as above, described single-pole double-throw switch (SPDT) preferably adopts integrated chip to realize.
Receiver circuit as above, it is the signal sending from the MCU in the optical module at receiver circuit place that described optical-fiber network is selected control signal.
Receiver circuit as above, for guaranteeing the performance of different optical-fiber networks, the resistance of described the first resistance and described the 3rd resistance is less than or equal to 200 ; The resistance of described the second resistance and described four resistance is greater than 4.7 .
Preferably, the resistance of described the first resistance and described the 3rd resistance is 51 .
Two of object of the present invention is to provide a kind of optical module that can simultaneously be applicable to EPON and GPON.Specifically:
An optical module, comprises receiver circuit and transmitter circuitry, and the reception signal input part of receiver circuit connects optical fiber receive module, the output connecting laser that transmits of transmitter circuitry, and wherein, receiver circuit adopts receiver circuit described above; And described transmitter circuitry is gigabit passive optical network optical line terminal optical module transmitter circuitry, described laser is that emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s.
Optical module as above, matches, and the photodetector in described optical fiber receive module is that 1310nm, speed are the photodetectors of 1.25Gb/s for receiving wavelength.
Three of object of the present invention is to provide a kind of optical module that can simultaneously be applicable to EPON, GPON, 10G EPON and tetra-kinds of access networks of XGPON.Specifically:
A kind of optical module, comprise the first receiver circuit, the second receiver circuit, the first transmitter circuitry and the second transmitter circuitry, the first receiver circuit and the second receiver circuit are connected to respectively an optical fiber receive module, the first transmitter circuitry is connected with the first laser, and the second transmitter circuitry is connected with second laser; The first receiver circuit is the receiver circuit described in any one in the claims 1 to 4;
The second receiver circuit is 10G ethernet passive optical network optical line terminal optical module receiver circuit;
The first transmitter circuitry is 10G ethernet passive optical network optical line terminal optical module transmitter circuitry, and the first laser is that emission wavelength is the EML laser of 1577nm, compatible 9.953Gb/s and 10.3125Gb/s speed;
The second transmitter circuitry is gigabit passive optical network optical line terminal optical module transmitter circuitry, and second laser is that emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s.
Optical module as above, matches, and the photodetector in described optical fiber receive module is that 1260-1360nm, speed are the photodetectors of 1.25-10.3125Gb/s for receiving wavelength.
Compared with prior art, advantage of the present invention and good effect are:
1, the present invention arranges selection circuit unit in receiver circuit, by the gate-controlled switch in selection circuit unit is controlled, in EPON or the different application optical-fiber network of GPON, adopt the peripheral circuit of different limited range enlargement unit so that signal is limit and to be put, make the reception signal of two kinds of different optical-fiber networks all can by limit, put smoothly and transmit, meet the immunity to interference requirement of two kinds of network signals simultaneously, improved the compatibility of receiver circuit.
2, in the optical module in one of goal of the invention provided by the present invention, receiver circuit adopts can compatible EPON and the circuit structure of GPON, and transmitter circuitry adopts GPON OLT transmitter circuitry, it is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s that the laser that transmitter circuitry drives adopts emission wavelength, is also GPON OLT downstream laser.And speed and the PRBS2 of the descending 2.488Gb/s using due to GPON 23speed and the PRBS2 of the descending 1.25Gb/s that-1 pattern is all used higher than EPON 7-1 pattern, therefore, the downlink transfer of 1490nm wavelength that can backward compatible EPON.So, realized the compatibility of the first optical module to EPON and GPON, only use a kind of optical module can meet the optical fiber access of two kinds of optical-fiber networks simultaneously.
3, goal of the invention provided by the present invention three in optical module be on the basis of above-mentioned the first optical module, increased receiver circuit and 10G EPON OLT transmitter circuitry for 10G EPON OLT, and 10G EPON OLT downstream signal transmitting in can compatible XGPON with transmitter circuitry, and by selecting suitable photodetector, the upward signal transmitting of the first optical module in again can compatible XGPON, thereby make goal of the invention three in optical module unitized, can be applied to four kinds of different PON Access Networks, avoided prior art will change the loaded down with trivial details of different optical modules to different Access Networks, reduced the management cost of optical module, development cost and carrying cost, and be conducive to advance the normalization of Optical Access Network.
Read by reference to the accompanying drawings after the specific embodiment of the present invention, it is clearer that the other features and advantages of the invention will become.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of first embodiment of receiver circuit for optical module of the present invention;
Fig. 2 is the circuit theory diagrams of second embodiment of receiver circuit for optical module of the present invention;
Fig. 3 is the theory diagram of first embodiment of optical module of the present invention;
Fig. 4 is the circuit theory diagrams of part-structure in Fig. 3 embodiment;
Fig. 5 is the theory diagram of second embodiment of optical module of the present invention;
Fig. 6 is one of circuit theory diagrams of part-structure in Fig. 5 embodiment;
Fig. 7 be part-structure in Fig. 5 embodiment circuit theory diagrams two.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail.
Please refer to Fig. 1, this Fig. 1 illustrates the circuit theory diagrams of first embodiment of receiver circuit for optical module of the present invention.
As shown in Figure 1, the receiver circuit of this embodiment comprises that the signal that optical fiber receive module ROSA is received carries out the limited range enlargement unit LIA of limited range enlargement, and LIA has differential signal positive input terminal a1, differential signal negative input terminal b1 and reference voltage source terminal Ref; Differential signal positive input terminal a1 is connected to the differential signal positive output terminal c1 of the optical fiber receive module ROSA of receiver circuit transmission of electric signals by the first charging capacitor C11, differential signal negative input terminal b1 connects the differential signal negative output terminal d1 of optical fiber receive module ROSA by the second charging capacitor C12.In addition, for realizing the compatibility of receiver circuit to EPON and GPON, this embodiment is provided with the first selection circuit unit on the line between differential signal positive input terminal a1 and C11 and between reference voltage source terminal Ref, and on the line between differential signal negative input terminal b1 and C12 and between reference voltage source terminal Ref, is provided with the second selection circuit unit.
Specifically, first selects circuit unit to include the first resistance R 11 and the second resistance R 12, and resistance R 11 one end are connected on the line between terminal a1 and capacitor C 11, and the other end is by the first gate-controlled switch D11 splicing ear Ref; Resistance R 12 and the 3rd gate-controlled switch D13 formation in parallel parallel branch, one end of parallel branch is connected on the line between terminal a1 and capacitor C 11, and the other end connects Ref by the second gate-controlled switch D12.
Second selects circuit unit structure and above-mentioned first to select circuit unit similar, include the 3rd resistance R 13 and the 4th resistance R 14, resistance R 13 one end are connected on the line between terminal b1 and capacitor C 12, and the other end is by the 4th gate-controlled switch D14 splicing ear Ref; Resistance R 14 and the 6th gate-controlled switch D16 formation in parallel parallel branch, one end of parallel branch is connected on the line between terminal b1 and capacitor C 12, and the other end is by the 5th gate-controlled switch D15 splicing ear Ref.
Wherein, gate-controlled switch D11, D12, D14 and D15 conducting or shutoff under the control of optical-fiber network selection control signal, gate-controlled switch D13 and D16 be conducting or shutoff under the control of GPON reset signal Reset.And optical-fiber network selection control signal is from outside control signal, in this embodiment, be the signal sending from the MCU in the optical module at receiver circuit place.
The operation principle of foregoing circuit is as follows: the photodetector in optical module is converted to the signal of telecommunication by light signal, after transforming, through capacitor C 11 and C12 difference, inputs in limiting amplifier LIA by trans-impedance amplifier TIA.Take and be connected to first of terminal a1 place to select circuit unit be example, MCU exports high and low different level signal, can control switch D11 and the turn-on and turn-off of D12, thus receiver circuit is applied in EPON or GPON.
For example, if receiver circuit is applied in EPON optical-fiber network, by MCU, export high level signal, control switch D11 conducting and switch D12 turn-off, and now, resistance R 11 connects Ref terminal by closed switch D11.By selecting the R11 of suitable resistance and the C11 of suitable capacitance, make receiver circuit can meet the requirement of EPON optical-fiber network.In general, the resistance of R11 is not more than 200 , be preferably 51 , and the capacitance of capacitor C 11 is selected between 100-300pF.
If receiver circuit is applied in GPON optical-fiber network, by MCU output low level signal, control switch D11 turn-offs and switch D12 conducting, and now, resistance R 12 or switch D13 selectivity are connected to Ref terminal by switch D12.Because the consecutive identical digital immunity to interference of GPON network requirement (CID) will reach 72bit, and, when having the signal of reception, need level Rapid Establishment, therefore, this embodiment is parallel with switch D13 in resistance R 12, and then be connected with Ref terminal by switch D12, and switch D13 is controlled by GPON reset signal Reset.When having the signal of reception, the pulse signal of Reset output high level, control switch D13 conducting, D13 selects low-impedance switch, and now, this switch D13 is by resistance R 12 short circuits, switch D13 is connected with Ref terminal by closed switch D12, because switch D13 impedance is lower, capacitor C 11 quickly-chargeables, level is able to Rapid Establishment.Complete when charging, in signal normal transmission process, Reset output low level pulse signal, now, switch D13 disconnects, and resistance R 12 is connected on Ref terminal by closed switch D12.Capacitance by the capacitor C 11 selecting the R12 of suitable resistance and match, makes receiver circuit can meet the requirement of GPON optical-fiber network.In general, the resistance of R12 is greater than 4.7 , the capacitance of capacitor C 11 is selected between 100-300pF.
Be connected to second of terminal b1 place and select the operation principle of circuit unit and the course of work and above-mentioned first to select circuit unit similar, can be with reference to the above-mentioned description to the first selection circuit unit.
This embodiment is by controlling the gate-controlled switch in selection circuit unit, in EPON or the different application optical-fiber network of GPON, adopt the peripheral circuit of different limited range enlargement unit to limit and put control signal, make the reception signal of two kinds of different optical-fiber networks all can by limit, put smoothly and transmit, meet the immunity to interference requirement of two kinds of network signals simultaneously, improved the compatibility of receiver circuit.
Please refer to Fig. 2, this Fig. 2 illustrates the circuit theory diagrams of second embodiment of receiver circuit for optical module of the present invention.
As shown in Figure 1, the receiver circuit structure of this embodiment and the structure of above-mentioned first embodiment of Fig. 1 are basic identical, and distinctive points is, adopts single-pole double throw gate-controlled switch to replace gate-controlled switch D11 and D12 and D14 and the D15 in Fig. 1.
Particular circuit configurations is: receiver circuit comprises that the signal that optical fiber receive module ROSA is received carries out the limited range enlargement unit LIA of limited range enlargement, and LIA has differential signal positive input terminal a2, differential signal negative input terminal b2 and reference voltage source terminal Ref; Differential signal positive input terminal a2 is connected to the differential signal positive output terminal c2 of the optical fiber receive module ROSA of receiver circuit transmission of electric signals by the first charging capacitor C21, differential signal negative input terminal b2 connects the differential signal negative output terminal d2 of optical fiber receive module ROSA by the second charging capacitor C22.In addition, for realizing the compatibility of receiver circuit to EPON and GPON, this embodiment is provided with the first selection circuit unit on the line between differential signal positive input terminal a2 and C21 and between reference voltage source terminal Ref, and on the line between differential signal negative input terminal b2 and C22 and between reference voltage source terminal Ref, is provided with the second selection circuit unit.
Specifically, first selects circuit unit to include the first resistance R 21 and the second resistance R 22, and resistance R 21 one end are connected on the line between terminal a2 and capacitor C 21, and the other end is by single-pole double throw gate-controlled switch D21 splicing ear Ref; Resistance R 22 is connected on the line between terminal a2 and capacitor C 21 with gate-controlled switch D22 formation in parallel parallel branch, one end of parallel branch, and the other end connects Ref by single-pole double throw gate-controlled switch D21.
Second selects circuit unit structure and above-mentioned first to select circuit unit similar, include the 3rd resistance R 23 and the 4th resistance R 24, resistance R 23 one end are connected on the line between terminal b2 and capacitor C 22, and the other end is by single-pole double throw gate-controlled switch D23 splicing ear Ref; Resistance R 24 is connected on the line between terminal b2 and capacitor C 22 with gate-controlled switch D24 formation in parallel parallel branch, one end of parallel branch, and the other end is by single-pole double throw gate-controlled switch D23 splicing ear Ref.
Wherein, single-pole double throw gate-controlled switch D21 and D23 conducting or shutoff under the control of optical-fiber network selection control signal, gate-controlled switch D22 and D24 be conducting or shutoff under the control of GPON reset signal Reset.And optical-fiber network selection control signal is from outside control signal, in this embodiment, be the signal sending from the MCU in the optical module at receiver circuit place.
Single-pole double-throw switch (SPDT) D21, under the high and low different level controling signal of MCU output, can select to be communicated with resistance R 21 with Ref terminal or be communicated with resistance R 22 and parallel branch and the Ref terminal of switch D22 formation.Equally, single-pole double-throw switch (SPDT) D23, under the high and low different level controling signal of MCU output, can select to be communicated with resistance R 23 with Ref terminal or be communicated with resistance R 24 and parallel branch and the Ref terminal of switch D24 formation.By the resistance of choose reasonable resistance R 21, R22, R23 and R24, and the capacitance of capacitor C 21 and C22, can make receiver circuit be applied in EPON or GPON.Concrete parameter selection, circuit working principle and process and Fig. 1 embodiment are similar, can be with reference to above-mentioned description.
In this embodiment, single-pole double-throw switch (SPDT) D21 and D23 preferably adopt integrated chip to realize.
The receiver circuit with the compatible performance of optical-fiber network is applied in optical module, can obtains the optical module of compatible different optical-fiber networks.
Please refer to Fig. 3, is the theory diagram of first embodiment of optical module of the present invention shown in this Fig. 3.
As shown in Figure 3, the optical module of this embodiment includes receiver circuit 303 and transmitter circuitry 301, the reception signal input part of receiver circuit 303 connects optical fiber receive module 304, the output connecting laser 302 that transmits of transmitter circuitry 301, the light signal that the light signal of laser 302 transmitting and optical fiber receive module 304 receive is by MUX(wavelength division multiplexer) 306 be coupling in optical fiber, and carry out optical communication by optical interface 307 and outside.
In this embodiment, receiver circuit 303 adopts the circuit structure of Fig. 1 or Fig. 2 embodiment, and transmitter circuitry 301 adopts GPON OLT transmitter circuitry, and laser 302 is for emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s, is also GPON OLT downstream laser.
As described in Fig. 1 and Fig. 2 embodiment, receiver circuit 303 can compatible EPON and two kinds of different networks of GPON.And for transmitter circuitry 301, what it adopted is GPON OLT transmitter circuitry, and emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s continuously, is also GPON OLT downstream laser.So, the optical module of Fig. 3 embodiment can be used as GPON OLT and uses, by selecting the photodetector in suitable optical fiber receive module 304, the continuous transmission of the signal that to realize the desired downstream wavelength of GPON and be 1490nm, speed be 2.488Gb/s and up wavelength are that the burst of 1310nm, the speed signal that is 1.2488Gb/s receives.
And speed and the PRBS2 of the descending 2.488Gb/s using due to GPON OLT 23speed and the PRBS2 of the descending 1.25Gb/s that-1 pattern is all used higher than EPON OLT 7-1 pattern, therefore, utilizes the structure of transmitter circuitry 301 and downstream laser 302 for GPON OLT, the downlink transfer of 1490nm wavelength signals that can backward compatible EPON.So the optical module of this embodiment is compatible to EPON and GPON, only use a kind of optical module can meet the optical fiber access of two kinds of optical-fiber networks simultaneously.
In addition, because the up wavelength of GPON OLT is that 1310nm, speed are 1.2488Gb/s, and the up wavelength of EPON OLT is 1310nm, speed, be 1.25Gb/s, therefore, the optionally connected receipts wavelength of the photodetector in optical fiber receive module 304 is that 1310nm, speed are that the photodetector of 1.25Gb/s is realized.
GPON OLT transmitter circuitry is prior art, can directly adopt circuit structure of the prior art to realize.As a preferred embodiment, can adopt the circuit going out as shown in Figure 4.
Please refer to Fig. 4, this figure is the circuit theory diagrams of transmitter circuitry part in Fig. 3 embodiment.As shown in Figure 4, the signal of telecommunication that launch inputs in laser driving chip U15 with difference form by TD1+, TD1-, after chip U15 processes, modulates the signal to laser TOSA3 upper, by laser TOSA3, is converted the electrical signal to light signal and is sent.The prior art that concrete modulation principle and process can be known for those skilled in the art, this embodiment is not specifically addressed.
Please refer to Fig. 5, this Fig. 5 illustrates the theory diagram of second embodiment of optical module of the present invention.
As shown in Figure 5, the optical module of this embodiment includes and connects the first transmitter circuitry 401 of the first laser 402, the second transmitter circuitry 403, the first receiver circuit 405 and the second receiver circuit 406, the first receiver circuits 405 and second receiver circuit 406 of connection second laser 404 are connected to respectively an optical fiber receive module 407.The light signal that the light signal of the first laser 402 and/or second laser 404 transmittings and optical fiber receive module 407 receive is coupling in optical fiber by MUX408, and carries out optical communication by optical interface 409 and outside.
Wherein, the first receiver circuit 405 can adopt the circuit structure of Fig. 1 or Fig. 2 embodiment, and the second receiver circuit 406 adopts 10G EPON OLT receiver circuit.
Because EPON OLT upstream signal wavelengths is that 1310nm, speed are 1.25Gb/s, GPON OLT upstream signal wavelengths is that 1310nm, speed are 1.2488Gb/s, the upstream signal wavelengths of XGPON OLT is that 1270nm, speed are 2.488Gb/s, and 10G EPON OLT has two-way upward signal, be respectively that wavelength is that signal and the wavelength that 1310nm, speed are 1.25Gb/s is the signal that 1270nm, speed are 10.3125Gb/s.Signal for the 10.3125Gb/s of 10G EPON OLT, can directly be received and be processed by the second receiver circuit 406.For other upward signal, as shown in Figure 1 and Figure 2 above, the first receiver circuit 405 can be used for processing GPON OLT upward signal and EPON OLT upward signal, and another upward signal of 10G EPON OLT is identical with EPON OLT, therefore, also can process by the first receiver circuit 405.Although the upstream signal wavelengths of XGPON OLT is 1270nm, speed is 2.488Gb/s, but because 1270nm and 1310nm belong to 1260-1360nm wave band, and in 10G EPON, receiving wavelength does not distinguish, therefore, allow the 1270nm channel of XGPON to be exported by the 1310nm channel of 10G EPON.By selecting the limited range enlargement unit in the first suitable receiver circuit 405, for example, the limit that selection can be processed 2.488Gb/s bandwidth is put, just can backward compatible 1.25Gb/s and the speed of 1.2488Gb/s, thus make the first receiver circuit 405 can compatible EPON, GPON and XGPON.Meanwhile, then pass through to select the photodetector in suitable optical fiber receive module 407, the upward signal that just can utilize the first receiver circuit 405 and the second receiver circuit 406 simultaneously to meet EPON, GPON, 10G EPON and tetra-kinds of optical-fiber networks of XGPON receives.As a preferred embodiment, the photodetector in optical fiber receive module 407 can selective reception wavelength be that 1260-1360nm, speed are that the photodetector of 1.25-10.3125Gb/s is realized.
In this embodiment, the first transmitter circuitry 401 adopts 10G EPON OLT transmitter circuitrys, corresponding the first laser 402 for emission wavelength be that 1577nm, speed are the EML lasers of 10.3125Gb/s; And the second transmitter circuitry 403 adopts GPON OLT transmitter circuitrys, accordingly second laser 404 for emission wavelength be that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s.
As described in the embodiment of Fig. 3 optical module, utilize the structure of transmitter circuitry 403 and downstream laser 404 for GPON OLT, can backward compatible EPON wavelength be that 1490nm, speed are the downlink transfer of 1.25Gb/s signal, realize EPON and the descending compatibility of GPON.Meanwhile, owing to also there is a downstream signal with EPON OLT same rate and co-wavelength in 10G EPON OLT, therefore, the wherein road downstream signal that the second transmitter circuitry 403 and coupled second laser 404 also can compatible 10G EPON OLT.
And the speed of another downstream signal of 10G EPON OLT is 10.3125Gb/s, wavelength, be 1577nm, the downstream signal speed of XGPON OLT is that 9.953Gb/s, wavelength are 1577nm, both signal wavelengths of transmitting are identical, and difference is only that speed has fine distinction.Therefore, can adopt 10G EPON OLT to dispose as the first transmitter circuitry 401 with transmitter circuitry, and adopting emission wavelength is that the EML laser of 1577nm, compatible 9.953Gb/s and 10.3125Gb/s speed uses as the first laser, thereby can realize the descending of 10G EPON OLT 10Gb/s and compatibility that XGPON OLT is descending.
Therefore, the optical module of this embodiment can be applied in four kinds of different PON Access Networks, avoided prior art will change the loaded down with trivial details of different optical modules to different Access Networks, reduce management cost, development cost and the carrying cost of optical module, and be conducive to advance the normalization of Optical Access Network.
10G EPON for OLT receiver circuit, GPON OLT with transmitter circuitry and 10G EPON OLT, with transmitter circuitry, be prior art, can directly adopt circuit structure of the prior art to realize.For example, as preferred embodiment, GPON OLT adopts the circuit structure shown in Fig. 4 with transmitter circuitry, and 10G EPON OLT can adopt the circuit structure shown in Fig. 6 with transmitter circuitry, and 10G EPON OLT can adopt the circuit structure shown in Fig. 7 with receiver circuit.
As shown in Figure 6, the figure shows the first transmitter circuitry in Fig. 5 embodiment, be also the circuit theory diagrams of transmitter circuitry part for 10G EPON OLT.
As shown in Figure 6, the signal of telecommunication of launching inputs to clock and data recovery unit with carrying out data shaping in chip U9 by TD+, TD-with difference form, data after shaping input in laser driver chip U10, signal after chip U10 processes output again, to drive EML laser TOSA1, and finally by laser TOSA1, convert the electrical signal to light signal and send.The prior art that concrete driving and principle of luminosity and process can be known for those skilled in the art, this embodiment is not specifically addressed.
As shown in Figure 7, the figure shows the second receiver circuit in Fig. 5 embodiment, be also the circuit theory diagrams of receiver circuit part for 10G EPON OLT.
As shown in Figure 7, the signal of telecommunication of 10G ROSA output, through coupling capacitance C14 and C15, is input in 10G limited range enlargement unit U3, after U3 limited range enlargement, exports again.The prior art that concrete driving and light-receiving principle and process can be known for those skilled in the art, this embodiment is not specifically addressed.
Above embodiment is only in order to technical scheme of the present invention to be described, but not is limited; Although the present invention is had been described in detail with reference to previous embodiment, for the person of ordinary skill of the art, the technical scheme that still can record previous embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the present invention's technical scheme required for protection.

Claims (10)

1. an OLT optical module receiver circuit, comprise limited range enlargement unit, limited range enlargement unit has the positive and negative input terminal of differential signal and reference voltage source terminal, it is characterized in that, differential signal positive input terminal is connected to the differential signal positive output terminal of the optical fiber receive module of receiver circuit transmission of electric signals by the first charging capacitor, differential signal negative input terminal connects the differential signal negative output terminal of optical fiber receive module by the second charging capacitor; Also comprise the first selection circuit unit and the second selection circuit unit, first selects circuit unit one end to be connected on the line between differential signal positive input terminal and the first charging capacitor, the other end connects reference voltage source terminal, second selects circuit unit one end to be connected on the connecting line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal;
First selects circuit unit to include the first resistance and the second resistance, and first resistance one end is connected on the line between differential signal positive input terminal and the first charging capacitor, and the other end connects reference voltage source terminal by the first gate-controlled switch; The second resistance and the 3rd gate-controlled switch formation in parallel parallel branch, one end of parallel branch is connected on the line between differential signal positive input terminal and the first charging capacitor, and the other end connects reference voltage source terminal by the second gate-controlled switch;
Second selects circuit unit to include the 3rd resistance and the 4th resistance, and the 3rd resistance one end is connected on the line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal by the 4th gate-controlled switch; The 4th resistance and the 6th gate-controlled switch formation in parallel parallel branch, one end of parallel branch is connected on the line between differential signal negative input terminal and the second charging capacitor, and the other end connects reference voltage source terminal by the 5th gate-controlled switch;
Conducting or the shutoff under the control of optical-fiber network selection control signal of the first gate-controlled switch, the second gate-controlled switch, the 4th gate-controlled switch and the 5th gate-controlled switch, the 3rd gate-controlled switch and the 6th gate-controlled switch conducting or shutoff under the control of gigabit passive optical network reset signal;
If the first gate-controlled switch conducting, the second gate-controlled switch turn-offs, and receiver circuit is applied to EPON optical-fiber network; If the first gate-controlled switch turn-offs, the second gate-controlled switch conducting, the second resistance or the 3rd gate-controlled switch selectivity are connected to reference voltage source terminal Ref by the second gate-controlled switch, receiver circuit application GPON optical-fiber network; Second selects the operation principle of circuit unit and the course of work and above-mentioned first to select circuit unit similar.
2. receiver circuit according to claim 1, is characterized in that, described the first gate-controlled switch and described the second gate-controlled switch are a single-pole double-throw switch (SPDT), and described the 4th gate-controlled switch and described the 5th gate-controlled switch are a single-pole double-throw switch (SPDT).
3. receiver circuit according to claim 2, is characterized in that, described single-pole double-throw switch (SPDT) adopts integrated chip to realize.
4. receiver circuit according to claim 1, is characterized in that, it is the signal sending from the MCU in the optical module at receiver circuit place that described optical-fiber network is selected control signal.
5. according to the receiver circuit described in any one in claim 1 to 4, it is characterized in that, the resistance of described the first resistance and described the 3rd resistance is less than or equal to 200 ; The resistance of described the second resistance and described the 4th resistance is greater than 4.7 .
6. receiver circuit according to claim 5, is characterized in that, the resistance of described the first resistance and described the 3rd resistance is 51 .
7. an OLT optical module, comprise receiver circuit and transmitter circuitry, the reception signal input part of receiver circuit connects optical fiber receive module, the output connecting laser that transmits of transmitter circuitry, it is characterized in that, receiver circuit is the receiver circuit described in any one in the claims 1 to 5; Described transmitter circuitry is gigabit passive optical network optical line terminal optical module transmitter circuitry, and described laser is that emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s.
8. OLT optical module according to claim 7, is characterized in that, the photodetector in described optical fiber receive module is that 1310nm, speed are the photodetectors of 1.25Gb/s for receiving wavelength.
9. an OLT optical module, it is characterized in that, comprise the first receiver circuit, the second receiver circuit, the first transmitter circuitry and the second transmitter circuitry, the first receiver circuit and the second receiver circuit are connected to respectively an optical fiber receive module, the first transmitter circuitry is connected with the first laser, and the second transmitter circuitry is connected with second laser; The first receiver circuit is the receiver circuit described in any one in the claims 1 to 4;
The second receiver circuit is 10G ethernet passive optical network optical line terminal optical module receiver circuit;
The first transmitter circuitry is 10G ethernet passive optical network optical line terminal optical module transmitter circuitry, and the first laser is that emission wavelength is the EML laser of 1577nm, compatible 9.953Gb/s and 10.3125Gb/s speed;
The second transmitter circuitry is gigabit passive optical network optical line terminal optical module transmitter circuitry, and second laser is that emission wavelength is that 1490nm, speed are the Distributed Feedback Lasers of 2.5Gb/s.
10. OLT optical module according to claim 9, is characterized in that, the photodetector in described optical fiber receive module is that 1260-1360nm, speed are the photodetectors of 1.25-10.3125Gb/s for receiving wavelength.
CN201110427265.6A 2011-12-20 2011-12-20 Receiver circuit for optical module and optical module Active CN102497605B (en)

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CN105635860A (en) * 2014-12-01 2016-06-01 北京蓝山科技股份有限公司 Triple play optical path structure in EPON/OLT
CN107204757A (en) * 2017-06-05 2017-09-26 成都优博创通信技术股份有限公司 A kind of double limit processing units
CN109698981A (en) * 2017-10-23 2019-04-30 深圳市中兴微电子技术有限公司 Configuration method, equipment and the storage medium of passive optical network
CN108540231B (en) * 2017-12-14 2019-10-29 武汉电信器件有限公司 A kind of adaptive OLT optical module and its control method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101217826A (en) * 2007-12-27 2008-07-09 华为技术有限公司 A device and method realizing operation access of different modes
CN102026047A (en) * 2009-09-10 2011-04-20 华为技术有限公司 Method, device and system for transmitting reset signals and rate indication signals
JP2011160054A (en) * 2010-01-29 2011-08-18 Nippon Telegr & Teleph Corp <Ntt> Dual rate amplitude limiting amplifier circuit
CN102263589A (en) * 2010-05-24 2011-11-30 华为技术有限公司 Signal receiving method, apparatus thereof and optical transceiver
CN202374266U (en) * 2011-12-20 2012-08-08 青岛海信宽带多媒体技术有限公司 Receiver circuit for optical module and optical module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101217826A (en) * 2007-12-27 2008-07-09 华为技术有限公司 A device and method realizing operation access of different modes
CN102026047A (en) * 2009-09-10 2011-04-20 华为技术有限公司 Method, device and system for transmitting reset signals and rate indication signals
JP2011160054A (en) * 2010-01-29 2011-08-18 Nippon Telegr & Teleph Corp <Ntt> Dual rate amplitude limiting amplifier circuit
CN102263589A (en) * 2010-05-24 2011-11-30 华为技术有限公司 Signal receiving method, apparatus thereof and optical transceiver
CN202374266U (en) * 2011-12-20 2012-08-08 青岛海信宽带多媒体技术有限公司 Receiver circuit for optical module and optical module

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