CN203313192U - An electric field chromatic dispersion compensation optical module - Google Patents
An electric field chromatic dispersion compensation optical module Download PDFInfo
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- CN203313192U CN203313192U CN2013202757479U CN201320275747U CN203313192U CN 203313192 U CN203313192 U CN 203313192U CN 2013202757479 U CN2013202757479 U CN 2013202757479U CN 201320275747 U CN201320275747 U CN 201320275747U CN 203313192 U CN203313192 U CN 203313192U
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Abstract
The utility model discloses an electric field chromatic dispersion compensation optical module comprising an optical path assembly, a laser receiving unit, and an electric field chromatic dispersion compensation EDC chip, wherein a common COM terminal of the optical path assembly is connected with a fiber. An optical output terminal of the optical path assembly is connected with an optical input terminal of the laser receiving unit. The optical path assembly outputs descending optical signals transmitted from the fiber to the laser receiving unit. An electric signal output of the laser receiving unit is connected with an electric signal input terminal of the EDC chip, and the laser receiving unit transforms the descending optical signals output by the optical path assembly into electric signals and output the electric signals to the EDC chip After the EDC chip carries out electric field chromatic dispersion compensation on the electric signals output by the laser optical receiving unit, the EDC chip outputs the electric signals to the dispersion compensation optical module. Since the EDC chip is arranged inside the electric field chromatic dispersion compensation optical module, and the signals after the photovoltaic conversion is subjected to an electric field chromatic dispersion compensation in the EDC chip inside the electric field chromatic dispersion compensation optical module, so that the dispersion compensation effects of the electric signals after the photoelectric conversion are better.
Description
Technical field
The utility model relates to technical field of optical fiber communication, relates in particular to a kind of electric territory dispersion compensation optical module.
Background technology
In fiber optic transmission system, light signal even after the Optical Fiber Transmission of up to a hundred kilometers, can produce chromatic dispersion and polarization mode dispersion through tens kilometers, and the existence of these dispersion phenomenons has caused pulse stretching and the intersymbol interference of light signal.Like this, after the light signal after Optical Fiber Transmission is converted to the signal of telecommunication, can produce larger time delay and distortion, make signal produce the larger error rate, limit transmission capacity and the transmission bandwidth of optical fiber.
At present, for the dispersion phenomenon of the light signal in Optical Fiber Transmission, mainly by light territory dispersion compensation technology and electric territory dispersion compensation technology, carry out dispersion compensation, to weaken long-distance optical fiber, transmit time delay and the distortion of the signal 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. the light signal after Optical Fiber Transmission is carried out to light territory dispersion compensation.But, the production technology more complicated of the optical devices such as dispersion compensating fiber or fiber grating, cost is higher, and loss is larger.
Therefore, in the fiber optic transmission system of prior art, generally adopt electric territory dispersion compensation (EDC, Electronic Dispersion Compensation) technology, the signal of telecommunication that light signal after Optical Fiber Transmission is changed carries out dispersion compensation, time delay and the distortion of the signal that correction causes due to chromatic dispersion, polarization mode dispersion, thus reach the effect of dispersion compensation.Electricity territory dispersion compensation technology has been avoided the optical device that use cost is higher, has better reduced time delay and the distortion of signal.
With the electric territory dispersion compensation method in optical line terminal (OLT, Optical Line Terminator), be that example describes: as shown in Figure 1, can comprise in OLT: 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, be provided with an EDC chip 103 on OLT system equipment 102.
OLT optical module 101 receives the light signal that Optical Fiber Transmission is come, and after light signal is converted to the signal of telecommunication, the signal of telecommunication is amplified to output; After the signal of telecommunication was exported by OLT optical module 101, transmission arrived the EDC chip 103 on OLT system equipment 102; After 103 pairs of signals of telecommunication of EDC chip carry out electric territory dispersion compensation, the signal of telecommunication after dispersion compensation is outputed to the MAC(Media Access Control on the OLT system equipment, medium access controller) or SerDes(Serializer/Deserializer, serializer/de-serializers, or switch).
Yet, inventor's discovery of the present utility model, the electric territory dispersion compensation method of prior art is not good to the compensation effect of the signal of telecommunication; Find afterwards by analysis, before due to the EDC chip in the OLT system equipment, the signal of telecommunication being carried out to electric territory dispersion compensation, 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 larger time delay and distortion, thereby make the EDC chip not good to the compensation effect of the signal of telecommunication.
In sum, the dispersion compensation poor effect of the electric territory of the prior art dispersion compensation method signal of telecommunication that the light signal after Optical Fiber Transmission is changed.
The utility model content
Embodiment of the present utility model provides a kind of electric territory dispersion compensation optical module, and the signal of telecommunication that makes the light signal after Optical Fiber Transmission change has better dispersion compensation effect.
The utility model provides a kind of electric territory dispersion compensation optical module, comprising: optical path component, ,Dian territory, laser pick-off unit dispersion compensation EDC chip; Wherein,
Described optical path component, its public COM end is connected with optical fiber, and its light output end is connected with the light input end of described laser pick-off unit, and it will output to from the downlink optical signal that described Optical Fiber Transmission is come described laser pick-off unit;
The electrical signal of described laser pick-off unit is connected with the electric signal input end of described EDC chip, and described laser pick-off unit outputs to described EDC chip after the downlink optical signal of described optical path component output is converted to the signal of telecommunication;
Described EDC chip carries out exporting described electric territory dispersion compensation optical module after the dispersion compensation of electric territory to the signal of telecommunication of described laser pick-off unit output.
Preferably, described laser pick-off unit specifically comprises: photodiode detector, trans-impedance amplifier, automatic gain control circuit, amplitude limiting amplifier circuit; Wherein,
Described photodiode detector, its light input end is connected with the light output end of described optical path component as the light input end of described laser pick-off unit, and its electrical signal is connected with the electric signal input end of described trans-impedance amplifier; Described photodiode detector outputs to described trans-impedance amplifier after the downlink optical signal of described optical path component output is converted to the signal of telecommunication;
The electrical signal of described trans-impedance amplifier is connected with the electric signal input end of described automatic gain control circuit; Described trans-impedance amplifier carries out outputing to described automatic gain control circuit after difference, amplification to the signal of telecommunication of described photodiode detector output;
The electrical signal of described automatic gain control circuit is connected with the electric signal input end of described amplitude limiting amplifier circuit; Described automatic gain control circuit makes adjusting with the intensity of the signal of telecommunication of described trans-impedance amplifier Gain Automaticly, and the signal of telecommunication after adjusting outputs to described amplitude limiting amplifier circuit;
The electrical signal of described amplitude limiting amplifier circuit is connected with the electric signal input end of described EDC chip as the electrical signal of described laser pick-off unit; Described amplitude limiting amplifier circuit outputs to described EDC chip after the signal of telecommunication of described automatic gain control circuit output is amplified.
Preferably, described EDC chip specifically comprises feed-forward equalizer and/or DFF.
Preferably, described electric territory dispersion compensation optical module also comprises: generating laser, laser driver;
Described laser driver, its electric signal input end is as the electric signal input end of described electric territory dispersion compensation optical module, its electrical signal is connected with the electric signal input end of described generating laser, in order to will be from the signal of telecommunication load-modulate of the electric signal input end of described electric territory dispersion compensation optical module input to described generating laser;
The light output end of described generating laser is connected with the light input end of described optical path component; Described generating laser is converted to uplink optical signal by the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres.
Preferably, described optical path component specifically comprises: filter F1, filter F2, filter F3; Wherein,
Filter F1, filter F3 are arranged on the line of optical axis of light input end of the optical axis of COM end of described optical path component and described photodiode detector; And filter F1De center overlaps with the intersection point along the line of the optical axis of the COM end of the along the line and described optical path component of the optical axis of described generating laser, and the angle between the optical axis of the COM end of filter F1 and described optical path component is 45 degree; The downlink optical signal of coming from described Optical Fiber Transmission, from after the COM end input of described optical path component, through the transmission effect of filter F1 and filter F3, outputs to the photodiode detector in described laser pick-off unit; Wherein, filter F3 intercepts the light signal of other wavelength outside described downlink optical signal;
Filter F2 is on the optical axis of the described generating laser between the light output end of described filter F1 and described generating laser along the line; 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, from the COM end of described optical path component, outputs to described optical fiber and transmit; Wherein, filter F2 intercepts to the light signal of described generating laser reflection or diffuse reflection.
Preferably, the first micro-control unit MCU of described electric territory dispersion compensation optical module is connected with described EDC chip by bus; And
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and the time delay that will determine and distortion information send to a MCU by described bus;
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 by described bus;
Described EDC chip is according to the described dispersion compensation value received, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting described electric territory dispersion compensation optical module after the dispersion compensation of electric territory.
Preferably, the second micro-control unit MCU of described electric territory dispersion compensation optical module is connected with described generating laser, described laser driver, described laser pick-off unit by bus; The 2nd MCU has been used for state-detection and the control of described electric territory dispersion compensation optical module, and completes the protocol function that described electric territory dispersion compensation optical module will meet.
Preferably, described electric territory dispersion compensation optical module is specially the optical line terminal optical module in optical line terminal; Wherein, described optical line terminal specifically comprises: OLT system equipment, at least one optical line terminal optical module;
Perhaps, described electric territory dispersion compensation optical module is specially the optical network unit optical module in optical network unit; Wherein, described optical network unit specifically comprises: optical network unit system equipment, described optical network unit optical module.
Preferably, the output pin of described electric territory dispersion compensation optical module comprises:
Pin TD+ and pin TD-: the signal of telecommunication sent in order to receive OLT system equipment or optical network unit system equipment;
Pin RD-and pin RD+: in order to the signal of telecommunication after OLT system equipment or the electric territory of optical network unit system equipment output dispersion compensation; And
Described electric territory dispersion compensation optical module specifically adopts the hot-swappable SFP optical module structure of miniaturization to encapsulate.
Preferably, described electric territory dispersion compensation optical module is applied in the ethernet passive optical network or gigabit passive optical network of optical access network.
The utility model embodiment is owing to being placed in the EDC chip inside of electric territory dispersion compensation optical module, and the signal of telecommunication after opto-electronic conversion completes electric territory dispersion compensation at the EDC chip of dispersion compensation optical module inside, electric territory; Thus, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, from the OLT optical module, 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, reduce time delay and the distortion of the signal of telecommunication, thereby made the dispersion compensation effect of the signal of telecommunication better.
Further, when the EDC chip breaks down, only need change, detect pluggable OLT optical module on the OLT system equipment, and need not change, detect whole OLT system equipment, reduce maintenance cost.
The EDC chip is placed in the hardware of electric territory dispersion compensation optical module, avoids the EDC chip to be subject to outside electromagnetic interference, has further improved the dispersion compensation effect; And in dispersion compensation optical module inside, electric territory, carry out debugging and the algorithm of electric territory chromatic dispersion compensating function, make debugging and test more flexibly, conveniently.
The accompanying drawing explanation
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 utility model embodiment;
Fig. 2 b is the internal structure block diagram of the optical line terminal optical module of the utility model embodiment;
Fig. 3 is the internal circuit schematic diagram of the laser pick-off unit of the utility model embodiment;
Fig. 4 is the light path schematic diagram of the optical path component of the utility model embodiment;
Fig. 5 is the internal structure block diagram of the optical network unit of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the utility model is further described.Yet, it should be noted that, many details of listing in specification are only in order to make the reader, to one or more aspects of the present utility model, a thorough understanding be arranged, even if do not have these specific details also can realize these aspects of the present utility model.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant to 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 processor, processor, object, executable program, execution, program and/or computer.For instance, the application program of moving on 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 a computer and/or be distributed between two or more computers.
Inventor of the present utility model, based on the analysis to the prior art scheme, consider and will be placed in optical module inside for the EDC chip of electric territory dispersion compensation, the electric territory dispersion compensation of the signal of telecommunication after the inside of optical module completes opto-electronic conversion, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, from the OLT optical module, be transferred to the OLT system equipment and the further decay and the loss that cause, reduced time delay and the distortion of the signal of telecommunication, reached better dispersion compensation effect.
Below in conjunction with accompanying drawing, describe the technical scheme of the utility model embodiment in detail.The utility model embodiment provides a kind of electric territory dispersion compensation optical module with electric territory chromatic dispersion compensating function, this electricity territory dispersion compensation can be applied in OLT as shown in Figure 2 a, and this OLT specifically comprises: at least one OLT optical module 200, OLT system equipment 210;
Wherein, as shown in Figure 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, its COM end (public port) is connected with optical fiber, and its light output end is connected with the light input end of laser pick-off unit 202.The downlink optical signal that optical path component 201 is just come from Optical Fiber Transmission outputs to laser pick-off unit 202.
Laser pick-off unit 202 is by the downlink optical signal of its light input end receiving light path assembly 201 outputs; The downlink optical signal of optical path component 201 output is converted to the signal of telecommunication, and after the signal of telecommunication is amplified, outputs to EDC chip 205 by the electrical signal of laser pick-off unit 202;
EDC chip 205 receives the signal of telecommunication of laser pick-off unit 202 outputs by its electric signal input end; After the signal of telecommunication received is carried out to electric territory dispersion compensation, by the output of the signal of telecommunication after dispersion compensation OLT optical module 200, specifically can output to MAC or SerDes on the OLT system equipment.
Particularly, after EDC chip 205 receives the signal of telecommunication of laser pick-off unit 202 outputs by its electric signal input end, the signal of telecommunication received is carried out to sampling analysis, judge time delay and the distortion of the signal of telecommunication, and the time delay of the signal of telecommunication and distortion information are sent to a MCU207 by bus;
After the one MCU207 receives the time delay and distortion information of the signal of telecommunication that EDC chip 205 sends by bus, 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 will calculate outputs to EDC chip 205 by bus; Wherein, a MCU207 and EDC chip specifically can be by I2C(Inter-Integrated Circuit) bus or SPI(Setial Peripheralinterface) bus is connected; And a MCU207 can be specifically single-chip microcomputer, controller, processor of various models etc.;
EDC chip 205, according to the dispersion compensation value of the signal of telecommunication of a MCU207 output, after the signal of telecommunication received is carried out to electric territory dispersion compensation, outputs to MAC or the SerDes on the OLT system equipment by the signal of telecommunication after dispersion compensation.
Above-mentioned laser pick-off unit 202 specifically comprises: photodiode detector, TIA(Transimpedance amplify, trans-impedance amplifier), AGC(Automatic Gain Control, automatic gain is controlled) 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, APD(Avalanche Photo Diode in laser pick-off unit 202, avalanche photodide) light input end of detector is as the light input end of laser pick-off unit 202, and be connected with the light output end of optical path component 201, by the wavelength of optical path component 201 output, be that 1577nm, bit rate are after the downlink optical signal of 10.3125Gbps is converted to the signal of telecommunication, by the electrical signal of APD detector, outputed to the electric signal input end of TIA; After the signal of telecommunication that TIA exports the APD detector carries out difference, amplification, by the electrical signal of TIA, outputed to the electric signal input end of agc circuit; Agc circuit makes adjusting with the intensity of the signal of telecommunication of TIA Gain Automaticly, and the signal of telecommunication after adjusting is outputed to the electric signal input end of amplitude limiting amplifier circuit by the electrical signal of AGC; After the signal of telecommunication that amplitude limiting amplifier circuit is exported AGC further amplifies, by the electrical signal of amplitude limiting amplifier circuit, outputed to the electric signal input end of EDC chip 205.The internal circuit schematic diagram of laser pick-off unit 202 as shown in Figure 3, due to the circuit that the internal circuit of this laser pick-off unit 202 is well known to those skilled in the art, is introduced herein no longer in detail.In addition, be applied to the OLT optical module 200 in the gigabit passive optical network of optical access network, the photodiode detector in laser pick-off unit 202 is specially PIN photodiode (PIN Photoelectric Diode) detector.
Above-mentioned EDC chip 205 specifically can be by the feed-forward equalizer (FFE in EDC chip 205, Feed Forward Equalizer) and/or DFF (DFE, Decision Feedback Equalizer) signal of telecommunication of the amplitude limiting amplifier circuit in laser pick-off unit 202 output is carried out to electric territory dispersion compensation.Because internal structure and the circuit of EDC chip 205 and FFE and DFE is well known to the skilled person, introduce no longer in detail herein.
Further, the electric territory dispersion compensation optical module be applied in OLT of the present utility model, namely the OLT optical module 200, also comprise: generating laser 203, laser driver 204, the 2nd MCU206.
The electric signal input end of laser driver 204 is as the electric signal input end of OLT optical module 200; Laser driver 204 receives by its electric signal input end the signal of telecommunication that MAC on the OLT system equipment or SerDes send, and the signal of telecommunication that the MAC on the OLT system equipment or SerDes are sent by the electrical signal load-modulate of laser driver 204 to generating laser 203.
Generating laser 203 receives laser driver 204 load-modulate after the signal of telecommunication of generating laser 203 by its electric signal input end, through electric light, change, the signal of telecommunication received is converted to uplink optical signal, and uplink optical signal is outputed to the light input end of optical path component 201 by the light output end of generating laser 203, by optical path component 201 coupled into optical fibres, transmit.
The 2nd MCU206 is connected with generating laser 203, laser driver 204, laser pick-off unit 202 by bus, be used to state-detection and the control that completes OLT optical module 200, and completes the protocol function that OLT optical module 200 will meet; Particularly, the 2nd MCU206 can detect, control laser driver 204, controls the utilizing emitted light 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 can be specifically single-chip microcomputer, controller, processor of various models etc.Described bus can be specifically I2C bus or spi bus.
Above-mentioned optical path component 201 specifically can comprise: filter F1, filter F2, filter F3.Wherein, filter F1, filter F3 are arranged on the line of optical axis of light input end of the optical axis of COM end of optical path component 201 and photodiode detector; And filter F1De center overlaps with the intersection point along the line of the optical axis of the COM end of the along the line and optical path component 201 of the optical axis of generating laser 203, and the angle between the optical axis of the COM end of filter F1 and optical path component 201 is 45 degree; Filter F2 is on the optical axis of the generating laser 203 between the light output end of filter F1 and generating laser 203 along the line.The angle along the line of the optical axis of filter F2 and generating laser 203 can be that 45 degree are to 90 degree; The informer's of the optical axis of the light input end of filter F3 and photodiode detector angle can be that 45 degree are to 90 degree.For example, be applied in the OLT optical module 200 in the ethernet passive optical network of optical access network, wavelength after Optical Fiber Transmission is 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), after the transmission effect of filter F1 and filter F3, output to laser pick-off unit 202; Wherein, filter F3 intercepts the light signal of other wavelength outside downlink optical signal.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, from the COM end, outputs to optical fiber 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 is well known to those skilled in the art, 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.The bit rate that generating laser 203 will receive 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.
Further, the 2nd MCU206 can also be connected with MAC or SerDes on the OLT system equipment by bus; MAC on the OLT system equipment or SerDes can control and realize by bus command the power saving function of 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 be connected (Pin) is defined as follows shown in table 1:
Table 1
As can be seen from Table 1, the output pin of OLT optical module 200 after encapsulating is 20.Wherein, the pin relevant to the communication function of OLT optical module 200 comprises:
Pin one 8 and pin one 9, be pin TD+ and pin TD-: the signal of telecommunication sent in order to receive MAC on the OLT system equipment or SerDes, 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+: in order to the signal of telecommunication after the MAC on the OLT system equipment or the electric territory of SerDes output dispersion compensation, namely the MAC on the OLT system equipment or SerDes receive by pin one 2 and pin one 3 signal of telecommunication of exporting after the EDC of OLT optical module 200 chip completes electric territory dispersion compensation.
The relevant pins of controlling OLT optical module 200 comprises:
Pin 4 and pin 5, namely the MAC on pin SDA and 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 by pin 4 and pin 5 data that the 2nd MCU returns.
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 electric territory dispersion compensation optical module that the utility model provides also can be applied to, in optical network unit (ONU, Optical Net Unit), be specially the ONU optical module.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 pin be connected (Pin) states shown in table 1 as defined above.
Further, when electricity territory dispersion compensation optical module encapsulates, can adopt SFP(Small Form-factor Pluggable, miniaturization is hot-swappable) optical module structure, can effectively reduce the volume of electric territory dispersion compensation optical module, thereby save the inner space of OLT or ONU.
In embodiment of the present utility model, the EDC chip is placed in to the inside of electric territory dispersion compensation optical module, the signal of telecommunication after opto-electronic conversion completes electric territory dispersion compensation at the EDC chip of dispersion compensation optical module inside, electric territory; Thus, avoided the signal of telecommunication before carrying out electric territory dispersion compensation, from the OLT optical module, 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, reduce time delay and the distortion of the signal of telecommunication, thereby made the dispersion compensation effect of the signal of telecommunication better.
Further, when the EDC chip breaks down, only need change, detect pluggable OLT optical module on the OLT system equipment, and need not change, detect whole OLT system equipment, reduce maintenance cost.
The EDC chip is placed in the hardware of electric territory dispersion compensation optical module, avoids the EDC chip to be subject to outside electromagnetic interference, has further improved the dispersion compensation effect; And in dispersion compensation optical module inside, electric territory, carry out debugging and the algorithm of electric territory chromatic dispersion compensating function, make debugging and test more flexibly, conveniently.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. an electric territory dispersion compensation optical module, is characterized in that, comprising: optical path component, ,Dian territory, laser pick-off unit dispersion compensation EDC chip; Wherein,
Described optical path component, its public COM end is connected with optical fiber, and its light output end is connected with the light input end of described laser pick-off unit, and it will output to from the downlink optical signal that described Optical Fiber Transmission is come described laser pick-off unit;
The electrical signal of described laser pick-off unit is connected with the electric signal input end of described EDC chip, and described laser pick-off unit outputs to described EDC chip after the downlink optical signal of described optical path component output is converted to the signal of telecommunication;
Described EDC chip carries out exporting described electric territory dispersion compensation optical module after the dispersion compensation of electric territory to the signal of telecommunication of described laser pick-off unit output.
2. electric territory as claimed in claim 1 dispersion compensation optical module, is characterized in that, described laser pick-off unit specifically comprises: photodiode detector, trans-impedance amplifier, automatic gain control circuit, amplitude limiting amplifier circuit; Wherein,
Described photodiode detector, its light input end is connected with the light output end of described optical path component as the light input end of described laser pick-off unit, and its electrical signal is connected with the electric signal input end of described trans-impedance amplifier; Described photodiode detector outputs to described trans-impedance amplifier after the downlink optical signal of described optical path component output is converted to the signal of telecommunication;
The electrical signal of described trans-impedance amplifier is connected with the electric signal input end of described automatic gain control circuit; Described trans-impedance amplifier carries out outputing to described automatic gain control circuit after difference, amplification to the signal of telecommunication of described photodiode detector output;
The electrical signal of described automatic gain control circuit is connected with the electric signal input end of described amplitude limiting amplifier circuit; Described automatic gain control circuit makes adjusting with the intensity of the signal of telecommunication of described trans-impedance amplifier Gain Automaticly, and the signal of telecommunication after adjusting outputs to described amplitude limiting amplifier circuit;
The electrical signal of described amplitude limiting amplifier circuit is connected with the electric signal input end of described EDC chip as the electrical signal of described laser pick-off unit; Described amplitude limiting amplifier circuit outputs to described EDC chip after the signal of telecommunication of described automatic gain control circuit output is amplified.
3. electric territory as claimed in claim 2 dispersion compensation optical module, is characterized in that,
Described EDC chip specifically comprises feed-forward equalizer and/or DFF.
4. electric territory as claimed in claim 3 dispersion compensation optical module, is characterized in that, also comprises: generating laser, laser driver;
Described laser driver, its electric signal input end is as the electric signal input end of described electric territory dispersion compensation optical module, its electrical signal is connected with the electric signal input end of described generating laser, in order to will be from the signal of telecommunication load-modulate of the electric signal input end of described electric territory dispersion compensation optical module input to described generating laser;
The light output end of described generating laser is connected with the light input end of described optical path component; Described generating laser is converted to uplink optical signal by the signal of telecommunication of load-modulate and transmits by described optical path component coupled into optical fibres.
5. electric territory as claimed in claim 4 dispersion compensation optical module, is characterized in that, described optical path component specifically comprises: filter F1, filter F2, filter F3; Wherein,
Filter F1, filter F3 are arranged on the line of optical axis of light input end of the optical axis of COM end of described optical path component and described photodiode detector; And filter F1De center overlaps with the intersection point along the line of the optical axis of the COM end of the along the line and described optical path component of the optical axis of described generating laser, and the angle between the optical axis of the COM end of filter F1 and described optical path component is 45 degree; The downlink optical signal of coming from described Optical Fiber Transmission, from after the COM end input of described optical path component, through the transmission effect of filter F1 and filter F3, outputs to the photodiode detector in described laser pick-off unit; Wherein, filter F3 intercepts the light signal of other wavelength outside described downlink optical signal;
Filter F2 is on the optical axis of the described generating laser between the light output end of described filter F1 and described generating laser along the line; 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, from the COM end of described optical path component, outputs to described optical fiber and transmit; Wherein, filter F2 intercepts to the light signal of described generating laser reflection or diffuse reflection.
6. electric territory as claimed in claim 5 dispersion compensation optical module, is characterized in that, the first micro-control unit MCU is connected with described EDC chip by bus; And
Described EDC chip is judged time delay and distortion to the signal of telecommunication of described laser pick-off unit output, and the time delay that will determine and distortion information send to a MCU by described bus;
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 by described bus;
Described EDC chip is according to the described dispersion compensation value received, and the signal of telecommunication that described laser pick-off unit is exported carries out exporting described electric territory dispersion compensation optical module after the dispersion compensation of electric territory.
7. electric territory as claimed in claim 5 dispersion compensation optical module, is characterized in that, the second micro-control unit MCU is connected with described generating laser, described laser driver, described laser pick-off unit by bus; The 2nd MCU has been used for state-detection and the control of described electric territory dispersion compensation optical module, and completes the protocol function that described electric territory dispersion compensation optical module will meet.
8. described electric territory as arbitrary as claim 1-7 dispersion compensation optical module, is characterized in that, described electric territory dispersion compensation optical module is specially the optical line terminal optical module in optical line terminal; Wherein, described optical line terminal specifically comprises: OLT system equipment, at least one optical line terminal optical module;
Perhaps, described electric territory dispersion compensation optical module is specially the optical network unit optical module in optical network unit; Wherein, described optical network unit specifically comprises: optical network unit system equipment, described optical network unit optical module.
9. electric territory as claimed in claim 8 dispersion compensation optical module, is characterized in that, its output pin comprises:
Pin TD+ and pin TD-: the signal of telecommunication sent in order to receive OLT system equipment or optical network unit system equipment;
Pin RD-and pin RD+: in order to the signal of telecommunication after OLT system equipment or the electric territory of optical network unit system equipment output dispersion compensation; And
Described electric territory dispersion compensation optical module specifically adopts the hot-swappable SFP optical module structure of miniaturization to encapsulate.
10. electric territory as claimed in claim 9 dispersion compensation optical module, is characterized in that, described electric territory dispersion compensation optical module is applied in the ethernet passive optical network or gigabit passive optical network of optical access network.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202757479U CN203313192U (en) | 2013-05-20 | 2013-05-20 | An electric field chromatic dispersion compensation optical module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202757479U CN203313192U (en) | 2013-05-20 | 2013-05-20 | An electric field chromatic dispersion compensation optical module |
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| CN203313192U true CN203313192U (en) | 2013-11-27 |
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| CN2013202757479U Expired - Fee Related CN203313192U (en) | 2013-05-20 | 2013-05-20 | An electric field chromatic dispersion compensation optical module |
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| Country | Link |
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- 2013-05-20 CN CN2013202757479U patent/CN203313192U/en not_active Expired - Fee Related
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