CN103281129A - Optical module and electric domain dispersion compensation method thereof - Google Patents
Optical module and electric domain dispersion compensation method thereof Download PDFInfo
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- CN103281129A CN103281129A CN2013101881346A CN201310188134A CN103281129A CN 103281129 A CN103281129 A CN 103281129A CN 2013101881346 A CN2013101881346 A CN 2013101881346A CN 201310188134 A CN201310188134 A CN 201310188134A CN 103281129 A CN103281129 A CN 103281129A
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Abstract
The invention discloses an optical module and an electric domain dispersion compensation method thereof. The optical module comprises an optical path assembly, a laser receiving unit, an EDC chip and a first MCU (microprogrammed control unit); the laser receiving unit receives a downlink optical signal sent from an optical fiber by the optical path assembly, converts the optical signal into an electrical signal and amplifies and outputs the electrical signal to the EDC chip; the EDC chip judges the time delay and distortion of the electrical signal outputted from the laser receiving unit and sends the judged time delay and distortion information to the first MCU; the first MCU computes a dispersion compensation value according to the received time delay and distortion information and outputs the value to the EDC chip; and the EDC chip performs electric domain dispersion compensation on the electrical signal outputted from the laser receiving unit according to the dispersion compensation value and outputs the electrical signal. The EDC chip is arranged in the optical module, and the electrical signal after the photoelectrical conversion is subjected to the electric domain dispersion compensation at the EDC chip in the optical module, so the dispersion compensation effect of the electrical signal is better.
Description
Technical field
The present invention relates to technical field of optical fiber communication, relate in particular to a kind of optical module and electric territory dispersion compensation method thereof.
Background technology
In fiber optic transmission system, after the Optical Fiber Transmission of light signal through tens kilometers even up to a hundred kilometers, can produce chromatic dispersion and polarization mode dispersion, the existence of these dispersion phenomenons has caused pulse stretching and the intersymbol interference of light signal.Like this, after the light signal after the process Optical Fiber Transmission is converted to the signal of telecommunication, can produce bigger time delay and distortion, make signal produce the bigger error rate, limit transmission capacity and the transmission bandwidth of optical fiber.
At present, at the dispersion phenomenon of the light signal in the Optical Fiber Transmission, mainly carry out dispersion compensation by light territory dispersion compensation technology and electric territory dispersion compensation technology, to weaken time delay and the distortion that long-distance optical fiber transmits the signal that is caused.
Light territory dispersion compensation technology mainly adopts dispersion compensating fiber (DCF, Dispersion Compensating Fiber) or chirped fiber grating (CFG, Chirped Fiber Gratin) compensation etc. to carrying out light territory dispersion compensation through the light signal after the Optical Fiber Transmission.But, the production technology more complicated of optical devices such as dispersion compensating fiber or fiber grating, cost is higher, and loss is bigger.
Therefore, generally adopt electric territory dispersion compensation (EDC in the fiber optic transmission system of prior art, Electronic Dispersion Compensation) technology, to carrying out dispersion compensation through the light signal institute electrical signal converted after the Optical Fiber Transmission, correct time delay and the distortion of the signal that causes owing to chromatic dispersion, polarization mode dispersion, thereby reach the effect of dispersion compensation.Electricity territory dispersion compensation technology has been avoided the higher optical device of use cost, has better reduced time delay and the distortion of signal.
Be that example describes with the electric territory dispersion compensation method in the optical line terminal (OLT, Optical Line Terminator): as shown in Figure 1, in OLT, can comprise: OLT system equipment 102 and at least one OLT optical module 101.Usually, an OLT system equipment 102 a plurality of OLT optical modules 101 of can pegging graft; Corresponding each OLT optical module 101, OLT system equipment 102 is provided with an EDC chip 103.
OLT optical module 101 receives the light signal that Optical Fiber Transmission are come, and after light signal is converted to the signal of telecommunication, the signal of telecommunication is amplified output; After the signal of telecommunication was exported by OLT optical module 101, transmission arrived the EDC chip 103 on the OLT system equipment 102; After 103 pairs of signals of telecommunication of EDC chip carry out electric territory dispersion compensation, the signal of telecommunication behind the dispersion compensation is outputed to MAC(Media Access Control on the OLT system equipment, medium access controller) or SerDes(Serializer/Deserializer, serializer/de-serializers, or switch).
Yet the present inventor finds that the electric territory dispersion compensation method of prior art is not good to the compensation effect of the signal of telecommunication; The back is found by analysis, because the EDC chip in the OLT system equipment carries out before the dispersion compensation of electric territory to the signal of telecommunication, the signal of telecommunication will be transferred to the OLT system equipment from the OLT optical module, transmission range is longer, further loss and the decay of the signal of telecommunication have been caused, make the signal of telecommunication produce bigger time delay and distortion, thereby make the EDC chip not good to the compensation effect of the signal of telecommunication.
Therefore, be necessary to provide a kind of electric territory dispersion compensation method to having better dispersion compensation effect through the light signal institute electrical signal converted after the Optical Fiber Transmission.
Summary of the invention
Embodiments of the invention provide a kind of optical module and electric territory dispersion compensation method thereof, make to have better dispersion compensation effect through the light signal institute electrical signal converted after the Optical Fiber Transmission.
According to an aspect of the present invention, provide a kind of optical module, having comprised: optical path component, laser pick-off unit, EDC chip, a MCU; Wherein,
Described laser pick-off unit is converted to the signal of telecommunication with described downlink optical signal after receiving the downlink optical signal of coming from Optical Fiber Transmission by described optical path component, and the described signal of telecommunication amplified outputs to described EDC chip;
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and time delay and the distortion information that determines sent to a MCU;
The one MCU calculates the dispersion compensation value according to the time delay and the distortion information that receive, and described dispersion compensation value is exported to described EDC chip;
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting behind the dispersion compensation of electric territory.
Preferably, described optical module is specially the optical line terminal optical module in the optical line terminal; Wherein, described optical line terminal specifically comprises: OLT system equipment, at least one optical line terminal optical module; And
Described optical line terminal optical module also comprises: generating laser, laser driver, the 2nd MCU;
Described laser driver receives the signal of telecommunication that MAC in the described OLT system equipment or SerDes send, and with the signal of telecommunication load-modulate that receives to described generating laser;
Described generating laser is converted to uplink optical signal with the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres;
The 2nd MCU is used for finishing state-detection and the control of described optical module, and finishes the protocol function that described optical module will satisfy.
Preferably, described optical module is specially the optical network unit optical module in the optical network unit; Wherein, described optical network unit specifically comprises: optical network unit system equipment, described optical network unit optical module; And
Described optical network unit optical module also comprises: generating laser, laser driver, the 2nd MCU;
Described laser driver receives the signal of telecommunication that MAC in the described optical network unit system equipment or SerDes send, and with the signal of telecommunication load-modulate that receives to described generating laser;
Described generating laser is converted to uplink optical signal with the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres;
The 2nd MCU is used for finishing state-detection and the control of described optical module, and finishes the protocol function that described optical module will satisfy.
Preferably, described optical path component specifically comprises: filter F1, filter F2, filter F3; Wherein,
The downlink optical signal of coming from described Optical Fiber Transmission through the transmission effect of filter F1 and filter F3, outputs to described laser pick-off unit after the COM end input of described optical path component; Wherein, filter F3 intercepts the light signal of other wavelength outside the described downlink optical signal;
After the uplink optical signal of described generating laser emission is input to described optical path component, through the transmission of filter F2 and the reflex of filter F1, outputs to described optical fiber from the COM end of described optical path component and transmit; Wherein, filter F2 intercepts to the light signal of described generating laser reflection or diffuse reflection.
Preferably, described laser pick-off unit specifically comprises: photodiode detector, trans-impedance amplifier, automatic gain control circuit, amplitude limiting amplifier circuit.
Preferably, described EDC chip specifically comprises feed-forward equalizer and/or DFF.
Preferably, described optical module output pin comprises:
Pin TD+ and pin TD-: in order to receive the signal of telecommunication that OLT system equipment or optical network unit system equipment send;
Pin RD-and pin RD+: in order to export the signal of telecommunication behind the dispersion compensation of electric territory to OLT system equipment or optical network unit system equipment; And
Described optical module specifically adopts SFP optical module structure to encapsulate.
According to another aspect of the present invention, also provide a kind of electric territory dispersion compensation method of optical module, having comprised:
The optical path component of the laser pick-off unit of described optical module by described optical module is converted to the signal of telecommunication with described downlink optical signal after receiving the downlink optical signal of coming from Optical Fiber Transmission, and the described signal of telecommunication is amplified the EDC chip that outputs to described optical module;
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and the MCU that the time delay that determines and distortion information are sent to described optical module;
The one MCU calculates the dispersion compensation value according to the time delay and the distortion information that receive, and described dispersion compensation value is exported to described EDC chip;
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting behind the dispersion compensation of electric territory.
Preferably, described optical module is specially the optical line terminal optical module in the optical line terminal; And
Described EDC chip is according to the dispersion compensation value that receives, and the signal of telecommunication of described laser pick-off unit output carried out exporting behind the dispersion compensation of electric territory be specially:
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication of laser pick-off unit output is carried out MAC or the SerDes on the OLT system equipment in the described optical line terminal of output behind the dispersion compensation of electric territory.
Preferably, described optical module is specially the optical network unit optical module in the optical network unit; And
Described EDC chip is according to the dispersion compensation value that receives, and the signal of telecommunication of described laser pick-off unit output carried out exporting behind the dispersion compensation of electric territory be specially:
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication of laser pick-off unit output is carried out MAC or the SerDes on the optical network unit system equipment in the described optical network unit of output behind the dispersion compensation of electric territory.
The embodiment of the invention is owing to place the EDC chip inside of optical module, the signal of telecommunication after the opto-electronic conversion carries out electric territory dispersion compensation at the EDC of optical module inside chip, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, be transferred to the OLT system equipment or be transferred to the ONU system equipment and the further decay and the loss that cause from the ONU optical module from the OLT optical module, reduced time delay and the distortion of the signal of telecommunication, thereby made that the dispersion compensation effect of the signal of telecommunication is better.
Further, when the EDC chip breaks down, only need pluggable OLT optical module on the OLT system equipment is changed, detected, and need not whole OLT system equipment be changed, detect, reduced maintenance cost.
The EDC chip places in the hardware of optical module, has avoided the EDC chip to be subjected to outside electromagnetic interference, has further improved the dispersion compensation effect; And carry out debugging and the algorithm of electric territory chromatic dispersion compensating function in optical module inside, make debugging and test more flexibly, conveniently.
Description of drawings
Fig. 1 is the internal structure block diagram of optical line terminal of the prior art;
Fig. 2 a is the internal structure block diagram of the optical line terminal of the embodiment of the invention;
Fig. 2 b is the internal structure block diagram of the optical line terminal optical module of the embodiment of the invention;
Fig. 3 is the internal circuit schematic diagram of the laser pick-off unit of the embodiment of the invention;
Fig. 4 is the light path schematic diagram of the optical path component of the embodiment of the invention;
Fig. 5 is the internal structure block diagram of the optical network unit of the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, need to prove that many details of listing in the specification only are in order to make the reader to one or more aspects of the present invention a thorough understanding be arranged, even if there are not these specific details also can realize these aspects of the present invention.
Terms such as " module " used in this application, " system " are intended to comprise the entity relevant with computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on the processor, processor, object, executable program, execution, program and/or computer.For instance, the application program of moving on the computing equipment and this computing equipment can be modules.One or more modules can be positioned at an executory process and/or thread, and module also can be on the computer and/or be distributed between two or more the computers.
The present inventor, based on the analysis to the prior art scheme, consider and to place optical module inside for the EDC chip of electric territory dispersion compensation, the electric territory dispersion compensation of the signal of telecommunication after opto-electronic conversion is finished in the inside of optical module, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, be transferred to the OLT system equipment and the further decay and the loss that cause from the OLT optical module, reduced time delay and the distortion of the signal of telecommunication, reached better dispersion compensation effect.
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.The embodiment of the invention provides a kind of optical module with electric territory chromatic dispersion compensating function, and this optical module can be applied among the OLT shown in Fig. 2 a, and this OLT specifically comprises: at least one OLT optical module 200, OLT system equipment 210;
Wherein, shown in Fig. 2 b, OLT optical module 200 comprises: optical path component 201, laser pick-off unit 202, EDC chip 205, a MCU(Micro Control Unit, micro-control unit) 207.
Wherein, optical path component 201 links to each other with optical fiber;
Laser pick-off unit 202 receives the downlink optical signal of coming from Optical Fiber Transmission by optical path component 201; The downlink optical signal that receives is converted to the signal of telecommunication, and outputs to EDC chip 205 after the signal of telecommunication amplified;
Particularly, EDC chip 205 carries out sampling analysis to the signal of telecommunication that receives after receiving the signal of telecommunication of laser pick-off unit 202 outputs, judges time delay and the distortion of the signal of telecommunication, and time delay and the distortion information of the signal of telecommunication sent to a MCU207;
After the one MCU207 receives the time delay and distortion information of the signal of telecommunication that EDC chip 205 sends, the dispersion compensation value that calculates the signal of telecommunication according to time delay and the distortion information of the signal of telecommunication, and the dispersion compensation value of the signal of telecommunication that calculates outputed to EDC chip 205; Wherein, a MCU207 and EDC chip specifically can be by (Inter-Integrated Circuit) bus or SPI(Setial Peripheralinterface) bus links to each other; And a MCU207 specifically can be single-chip microcomputer, controller, processor of various models etc.;
Above-mentioned laser pick-off unit 202 specifically comprises: photodiode detector, TIA(Transimpedance amplify, trans-impedance amplifier), AGC(Automatic Gain Control, automatic gain control) circuit, amplitude limiting amplifier circuit.For example, be applied to the OLT optical module 200 in the ethernet passive optical network of optical access network, the photodiode detector in the laser pick-off unit 202 is specially APD(Avalanche Photo Diode, avalanche photodide) detector; The APD detector is that 1577nm, bit rate are that the downlink optical signal of 10.3125Gbps is converted to the signal of telecommunication with the wavelength of optical path component 201 output; The APD detector of TIA electrical signal converted is carried out difference, is amplified back output; Agc circuit makes adjusting with the intensity of the signal of telecommunication of TIA Gain Automaticly; Amplitude limiting amplifier circuit further outputs to EDC chip 205 after the amplification to the signal of telecommunication of AGC output.The internal circuit schematic diagram of laser pick-off unit 202 as shown in Figure 3 because the circuit that the internal circuit of this laser pick-off unit 202 is well known to those skilled in the art is introduced no longer in detail herein.In addition, OLT optical module 200 also can be applicable in the gigabit passive optical network of optical access network, and then the photodiode detector of laser pick-off unit 202 wherein can be PIN photodiode (PIN Photoelectric Diode) detector.
Above-mentioned EDC chip 205 specifically can be by the feed-forward equalizer (FFE in the EDC chip 205, Feed Forward Equalizer) and/or DFF (DFE, Decision Feedback Equalizer) signal of telecommunication of the amplitude limiting amplifier circuit in the laser pick-off unit 202 output is carried out electric territory dispersion compensation.Because internal structure and the circuit of EDC chip 205 and FFE and DFE all are well known to those skilled in the art, introduce no longer in detail herein.
Further, the optical module with chromatic dispersion compensating function among the OLT of being applied to of the present invention, just the OLT optical module 200, also comprise: generating laser 203, laser driver 204, the 2nd MCU206.
Generating laser 203 is receiving laser driver 204 load-modulate behind the signal of telecommunication of generating laser 203, change through electric light, the signal of telecommunication that receives is converted to uplink optical signal, and uplink optical signal is outputed to optical path component 201, transmit by optical path component 201 coupled into optical fibres.
The 2nd MCU206 is used for finishing state-detection and the control of OLT optical module 200, and finishes the protocol function that OLT optical module 200 will satisfy; Particularly, the 2nd MCU206 can detect, control laser driver 204, controls the emission luminous power of generating laser 203; The 2nd MCU206 can detect, control the received optical power of laser pick-off unit 202; In addition, the 2nd MCU206 can also detect, control supply power voltage, temperature of OLT optical module 200 etc.Wherein, the 2nd MCU206 specifically can be single-chip microcomputer, controller, processor of various models etc.
Above-mentioned optical path component 201 specifically can comprise: filter F1, filter F2, filter F3.For example, be applied in the OLT optical module 200 in the ethernet passive optical network of optical access network, be that 1577nm, bit rate are that the downlink optical signal of 10.3125Gbps is input to optical path component 201 by COM end (public port) through the wavelength after the Optical Fiber Transmission, after the transmission effect of filter F1 and filter F3, output to laser pick-off unit 202; Wherein, the light signal of other wavelength outside the downlink optical signal of filter F3 intercepts.The wavelength of generating laser 203 emission is that 1310nm, bit rate are that the uplink optical signal of 1.25Gbps is input to optical path component 201, after the reflex of the transmission of filter F2 and filter F1, outputs to optical fiber from the COM end and transmits.Wherein, filter F2 intercepts to the light signal of generating laser 203 reflection or diffuse reflection.Wherein, filter F1, filter F2, filter F3 can be film WBF(Wavelength Block Filter, and wavelength intercepts filter plate).The light path schematic diagram of optical path component 201 as shown in Figure 4; Because the light path of optical path component 201 and the position of each filter plate relation are well known to those skilled in the art, and introduce no longer in detail herein.
In addition, be applied to the laser driver 204 of the OLT optical module 200 in the ethernet passive optical network of optical access network, the bit rate that the MAC on the OLT system equipment or SerDes are sent is that the signal of telecommunication load-modulate of 1.25Gpbs is to generating laser 203.Generating laser 203 with the bit rate that receives be the signal of telecommunication of 1.25Gpbs after electric light conversion, being converted to wavelength is that 1310nm, bit rate are the uplink optical signal of 1.25Gpbs, transmits by optical path component 201 coupled into optical fibres.The circuit that the internal circuit of laser driver 204 and generating laser 203 is well known to those skilled in the art is introduced herein no longer in detail.
The 2nd MCU206 realizes state-detection and the control of OLT optical module 200 by bus, and finishes the protocol function that OLT optical module 200 will satisfy.Described bus specifically can be I2C bus or spi bus.
Further, the 2nd MCU206 can also link to each other with MAC or SerDes on the OLT system equipment by bus; MAC on the OLT system equipment or SerDes can be by the power saving functions of bus command control and realization OLT optical module 200.
After the OLT optical module 200 that is applied to the ethernet passive optical network of fiber optic transmission system receiving terminal encapsulates, itself and external equipment, such as the MAC on the OLT system equipment or SerDes, the pin that is connected (Pin) is defined as follows shown in the table 1:
Table 1
As can be seen from Table 1, the output pin after OLT optical module 200 encapsulates is 20.Wherein, relevant with the communication function of OLT optical module 200 pin comprises:
Pin one 8 and pin one 9, be pin TD+ and pin TD-: in order to receive the signal of telecommunication that MAC on the OLT system equipment or SerDes send, namely the MAC on the OLT system equipment or SerDes are the signal of telecommunication of 1.25Gpbs to the laser driver Transmit Bit Rate by pin one 8 and pin one 9;
Pin one 2 and pin one 3, be pin RD-and pin RD+: export the signal of telecommunication behind the dispersion compensation of electric territory in order to the MAC on the OLT system equipment or SerDes, namely the MAC on the OLT system equipment or SerDes receive by pin one 2 and pin one 3 and finish the signal of telecommunication of exporting behind the dispersion compensation of electric territory through the EDC of OLT optical module 200 chip.
The relevant pins of control OLT optical module 200 comprises:
Pin 4 and pin 5, namely the MAC on pin SDA and the pin SCL:OLT system equipment or SerDes realize and the communicating by letter of the 2nd MCU by pin 4 and pin 5.Particularly, the MAC on the OLT system equipment or SerDes send instruction by pin 4 and pin 5 to the 2nd MCU, and receive the data that the 2nd MCU returns by pin 4 and pin 5.
Other pin of OLT optical module 200 is well known to those skilled in the art, and introduces no longer in detail herein.
In addition, as shown in Figure 5, the optical module with chromatic dispersion compensating function provided by the invention also can be applied to be specially the ONU optical module in the optical network unit (ONU, Optical Net Unit).ONU comprises ONU optical module and ONU system equipment; Wherein, the ONU optical module comprises above-mentioned optical path component 201, laser pick-off unit 202, EDC chip 205, a MCU207, and generating laser 203, laser driver 204, the 2nd MCU(Micro Control Unit, micro-control unit) 206.After the ONU optical module that is applied to the ethernet passive optical network of fiber optic transmission system receiving terminal encapsulates, itself and external equipment, such as the MAC on the ONU system equipment or SerDes, the definition of the pin that is connected (Pin) is shown in above-mentioned table 1.
Further, when the optical module with electric territory chromatic dispersion compensating function encapsulates, can adopt SFP(Small Form-factor Pluggable, miniaturization is hot-swappable) the optical module structure, can effectively reduce to have the volume of the optical module of electric territory chromatic dispersion compensating function, thereby save the inner space of OLT or ONU.
In the embodiments of the invention, the EDC chip is placed the inside of optical module, the signal of telecommunication after the opto-electronic conversion is finished electric territory dispersion compensation at the EDC of optical module inside chip; Thus, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, be transferred to the OLT system equipment or be transferred to the ONU system equipment and the further decay and the loss that cause from the ONU optical module from the OLT optical module, reduced time delay and the distortion of the signal of telecommunication, thereby made that the dispersion compensation effect of the signal of telecommunication is better.
Further, when the EDC chip breaks down, only need pluggable OLT optical module on the OLT system equipment is changed, detected, and need not whole OLT system equipment be changed, detect, reduced maintenance cost.
The EDC chip places in the hardware of optical module, avoids the EDC chip to be subjected to outside electromagnetic interference, has further improved the dispersion compensation effect; And carry out debugging and the algorithm of electric territory chromatic dispersion compensating function in optical module inside, make debugging and test more flexibly, conveniently.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an optical module is characterized in that, comprising: optical path component, laser pick-off unit, EDC chip, a MCU; Wherein,
Described laser pick-off unit is converted to the signal of telecommunication with described downlink optical signal after receiving the downlink optical signal of coming from Optical Fiber Transmission by described optical path component, and the described signal of telecommunication amplified outputs to described EDC chip;
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and time delay and the distortion information that determines sent to a MCU;
The one MCU calculates the dispersion compensation value according to the time delay and the distortion information that receive, and described dispersion compensation value is exported to described EDC chip;
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting behind the dispersion compensation of electric territory.
2. optical module as claimed in claim 1 is characterized in that, described optical module is specially the optical line terminal optical module in the optical line terminal; Wherein, described optical line terminal specifically comprises: OLT system equipment, at least one optical line terminal optical module; And
Described optical line terminal optical module also comprises: generating laser, laser driver, the 2nd MCU;
Described laser driver receives the signal of telecommunication that MAC in the described OLT system equipment or SerDes send, and with the signal of telecommunication load-modulate that receives to described generating laser;
Described generating laser is converted to uplink optical signal with the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres;
The 2nd MCU is used for finishing state-detection and the control of described optical module, and finishes the protocol function that described optical module will satisfy.
3. optical module as claimed in claim 1 is characterized in that, described optical module is specially the optical network unit optical module in the optical network unit; Wherein, described optical network unit specifically comprises: optical network unit system equipment, described optical network unit optical module; And
Described optical network unit optical module also comprises: generating laser, laser driver, the 2nd MCU;
Described laser driver receives the signal of telecommunication that MAC in the described optical network unit system equipment or SerDes send, and with the signal of telecommunication load-modulate that receives to described generating laser;
Described generating laser is converted to uplink optical signal with the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres;
The 2nd MCU is used for finishing state-detection and the control of described optical module, and finishes the protocol function that described optical module will satisfy.
4. as the arbitrary described optical module of claim 1-3, it is characterized in that described optical path component specifically comprises: filter F1, filter F2, filter F3; Wherein,
The downlink optical signal of coming from described Optical Fiber Transmission through the transmission effect of filter F1 and filter F3, outputs to described laser pick-off unit after the COM end input of described optical path component; Wherein, filter F3 intercepts the light signal of other wavelength outside the described downlink optical signal;
After the uplink optical signal of described generating laser emission is input to described optical path component, through the transmission of filter F2 and the reflex of filter F1, outputs to described optical fiber from the COM end of described optical path component and transmit; Wherein, filter F2 intercepts to the light signal of described generating laser reflection or diffuse reflection.
5. as the arbitrary described optical module of claim 1-3, it is characterized in that described laser pick-off unit specifically comprises: photodiode detector, trans-impedance amplifier, automatic gain control circuit, amplitude limiting amplifier circuit.
6. as the arbitrary described optical module of claim 1-3, it is characterized in that,
Described EDC chip specifically comprises feed-forward equalizer and/or DFF.
7. as claim 2 or 3 described optical modules, it is characterized in that its output pin comprises:
Pin TD+ and pin TD-: in order to receive the signal of telecommunication that OLT system equipment or optical network unit system equipment send;
Pin RD-and pin RD+: in order to export the signal of telecommunication behind the dispersion compensation of electric territory to OLT system equipment or optical network unit system equipment; And
Described optical module specifically adopts SFP optical module structure to encapsulate.
8. the electric territory dispersion compensation method of an optical module is characterized in that, comprising:
The optical path component of the laser pick-off unit of described optical module by described optical module is converted to the signal of telecommunication with described downlink optical signal after receiving the downlink optical signal of coming from Optical Fiber Transmission, and the described signal of telecommunication is amplified the EDC chip that outputs to described optical module;
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and the MCU that the time delay that determines and distortion information are sent to described optical module;
The one MCU calculates the dispersion compensation value according to the time delay and the distortion information that receive, and described dispersion compensation value is exported to described EDC chip;
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting behind the dispersion compensation of electric territory.
9. the electric territory dispersion compensation method of optical module as claimed in claim 8 is characterized in that, described optical module is specially the optical line terminal optical module in the optical line terminal; And
Described EDC chip is according to the dispersion compensation value that receives, and the signal of telecommunication of described laser pick-off unit output carried out exporting behind the dispersion compensation of electric territory be specially:
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication of laser pick-off unit output is carried out MAC or the SerDes on the OLT system equipment in the described optical line terminal of output behind the dispersion compensation of electric territory.
10. the electric territory dispersion compensation method of optical module as claimed in claim 8 is characterized in that, described optical module is specially the optical network unit optical module in the optical network unit; And
Described EDC chip is according to the dispersion compensation value that receives, and the signal of telecommunication of described laser pick-off unit output carried out exporting behind the dispersion compensation of electric territory be specially:
Described EDC chip is according to the described dispersion compensation value that receives, and the signal of telecommunication of laser pick-off unit output is carried out MAC or the SerDes on the optical network unit system equipment in the described optical network unit of output behind the dispersion compensation of electric territory.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114650096A (en) * | 2022-03-24 | 2022-06-21 | 中国电信股份有限公司 | Optical path self-adaptive dispersion compensation method, optical module and wavelength division multiplexing system |
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