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 an optical fiber communication technical field especially relates to an electric domain dispersion compensation optical module.
Background
In an optical fiber transmission system, after an optical signal is transmitted through an optical fiber with a length of tens of kilometers or even hundreds of kilometers, chromatic dispersion and polarization mode dispersion are generated, and the existence of the dispersion phenomena causes pulse broadening and intersymbol interference of the optical signal. Therefore, after the optical signal transmitted by the optical fiber is converted into an electrical signal, larger time delay and distortion can be generated, so that the signal generates a larger error rate, and the transmission capacity and the transmission bandwidth of the optical fiber are limited.
At present, for the dispersion phenomenon of optical signals in optical fiber transmission, dispersion compensation is mainly performed through an optical domain dispersion compensation technology and an electrical domain dispersion compensation technology, so as to weaken time delay and distortion of signals caused by long-distance optical fiber transmission.
The optical domain Dispersion compensation technology mainly adopts Dispersion Compensation Fiber (DCF) or Chirped Fiber Grating (CFG) compensation and the like to perform optical domain Dispersion compensation on optical signals transmitted through optical fibers. However, the production process of optical devices such as dispersion compensation fibers or fiber gratings is complicated, the cost is high, and the loss is large.
Therefore, in the optical fiber transmission system of the prior art, an Electrical Dispersion Compensation (EDC) technique is generally used to perform Dispersion Compensation on an electrical signal converted from an optical signal transmitted through an optical fiber, and correct the time delay and distortion of the signal caused by chromatic Dispersion and polarization mode Dispersion, thereby achieving the effect of Dispersion Compensation. The electric domain dispersion compensation technology avoids optical devices with higher use cost, and better reduces the time delay and distortion of signals.
An electrical domain dispersion compensation method in an Optical Line Terminal (OLT) will be described as an example: as shown in fig. 1, the OLT may include: an OLT system device 102 and at least one OLT optical module 101. Generally, one OLT system device 102 can plug in a plurality of OLT optical modules 101; for each OLT optical module 101, an EDC chip 103 is provided on the OLT system device 102.
The OLT optical module 101 receives an optical signal transmitted by an optical fiber, converts the optical signal into an electrical signal, and amplifies and outputs the electrical signal; after being output by the OLT optical module 101, the electrical signal is transmitted to the EDC chip 103 on the OLT system device 102; the EDC chip 103 performs electrical domain dispersion compensation on the electrical signal, and outputs the dispersion-compensated electrical signal to a MAC (Media Access controller) or a SerDes (Serializer/Deserializer, or data switching device) on the OLT system device.
However, the inventors of the present invention found that the prior art electrical domain dispersion compensation method has poor compensation effect on electrical signals; after analysis, it is found that, before the EDC chip in the OLT system device performs electric domain dispersion compensation on the electrical signal, the electrical signal needs to be transmitted from the OLT optical module to the OLT system device, and the transmission distance is long, which causes further loss and attenuation of the electrical signal, and causes greater time delay and distortion of the electrical signal, so that the EDC chip has poor compensation effect on the electrical signal.
In summary, the chromatic dispersion compensation method in the prior art has a poor chromatic dispersion compensation effect on the electrical signal converted from the optical signal transmitted through the optical fiber.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an electric domain dispersion compensation optical module for the signal of telecommunication that the light signal after the optical fiber transmission converted has better dispersion compensation effect.
The utility model provides an electric domain dispersion compensation optical module, include: the device comprises an optical path component, a laser receiving unit and an electric domain dispersion compensation EDC chip; wherein,
the common COM end of the optical path component is connected with an optical fiber, the optical output end of the optical path component is connected with the optical input end of the laser receiving unit, and the optical path component outputs a downlink optical signal transmitted from the optical fiber to the laser receiving unit;
the electrical signal output end of the laser receiving unit is connected with the electrical signal input end of the EDC chip, and the laser receiving unit converts the downlink optical signal output by the optical path component into an electrical signal and outputs the electrical signal to the EDC chip;
and the EDC chip outputs the electric domain dispersion compensation optical module after performing electric domain dispersion compensation on the electric signal output by the laser receiving unit.
Preferably, the laser receiving unit specifically includes: the device comprises a photodiode detector, a transimpedance amplifier, an automatic gain control circuit and an amplitude limiting amplification circuit; wherein,
the optical input end of the photodiode detector is used as the optical input end of the laser receiving unit and is connected with the optical output end of the optical path component, and the electrical signal output end of the photodiode detector is connected with the electrical signal input end of the transimpedance amplifier; the photodiode detector converts the downlink optical signal output by the optical path component into an electrical signal and outputs the electrical signal to the transimpedance amplifier;
the electric signal output end of the transimpedance amplifier is connected with the electric signal input end of the automatic gain control circuit; the transimpedance amplifier performs difference and amplification on the electric signal output by the photodiode detector and outputs the electric signal to the automatic gain control circuit;
the electric signal output end of the automatic gain control circuit is connected with the electric signal input end of the amplitude limiting amplifying circuit; the automatic gain control circuit enables the gain of the trans-impedance amplifier to be automatically adjusted along with the intensity of the electric signal and outputs the adjusted electric signal to the amplitude limiting amplifying circuit;
an electric signal output end of the amplitude limiting amplifying circuit is used as an electric signal output end of the laser receiving unit and is connected with an electric signal input end of the EDC chip; and the amplitude limiting amplifying circuit amplifies the electric signal output by the automatic gain control circuit and outputs the amplified electric signal to the EDC chip.
Preferably, the EDC chip specifically includes a feedforward equalizer and/or a decision feedback equalizer.
Preferably, the optical module for electrical domain dispersion compensation further includes: a laser emitter, a laser driver;
the electrical signal input end of the laser driver is used as the electrical signal input end of the electrical domain dispersion compensation optical module, and the electrical signal output end of the laser driver is connected with the electrical signal input end of the laser transmitter and used for loading and modulating the electrical signal input from the electrical signal input end of the electrical domain dispersion compensation optical module to the laser transmitter;
the light output end of the laser transmitter is connected with the light input end of the light path component; and the laser transmitter converts the electric signal subjected to loading modulation into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission.
Preferably, the optical path component specifically includes: a filter F1, a filter F2, and a filter F3; wherein,
the optical filter F1 and the optical filter F3 are arranged on a connecting line of an optical axis of the COM end of the optical path component and an optical axis of the optical input end of the photodiode detector; the center of the optical filter F1 coincides with the intersection point of the line of the optical axis of the laser emitter and the line of the optical axis of the COM end of the optical path component, and the included angle between the optical filter F1 and the optical axis of the COM end of the optical path component is 45 degrees; the downlink optical signal transmitted from the optical fiber is input from the COM end of the optical path component, and then is output to a photodiode detector in the laser receiving unit through the transmission action of an optical filter F1 and an optical filter F3; the optical filter F3 is used for blocking optical signals with other wavelengths except the downlink optical signal;
a filter F2 is located along the line of the optical axis of the laser emitter between the filter F1 and the optical output of the laser emitter; after an uplink optical signal emitted by the laser emitter is input into the optical path component, the uplink optical signal is output to the optical fiber from the COM end of the optical path component for transmission through the transmission of the optical filter F2 and the reflection of the optical filter F1; wherein the optical filter F2 blocks the optical signal reflected or diffusely reflected to the laser emitter.
Preferably, the first micro control unit MCU of the electrical domain dispersion compensation optical module is connected to the EDC chip through a bus; and
the EDC chip judges time delay and distortion of the electric signal output by the laser receiving unit and sends the judged time delay and distortion information to the first MCU through the bus;
the first MCU calculates a dispersion compensation value according to the received time delay and distortion information and outputs the dispersion compensation value to the EDC chip through the bus;
and the EDC chip performs electric domain dispersion compensation on the electric signal output by the laser receiving unit according to the received dispersion compensation value and outputs the electric domain dispersion compensation optical module.
Preferably, the second micro control unit MCU of the electric domain dispersion compensation optical module is connected to the laser transmitter, the laser driver, and the laser receiving unit through a bus; the second MCU is used for completing the state detection and control of the electric domain dispersion compensation optical module and completing the protocol function to be met by the electric domain dispersion compensation optical module.
Preferably, the optical module for electrical domain dispersion compensation is an optical line terminal optical module in an optical line terminal; wherein, the optical line terminal specifically includes: the optical line terminal system comprises optical line terminal system equipment and at least one optical line terminal optical module;
or, the electric domain dispersion compensation optical module is specifically an optical network unit optical module in an optical network unit; the optical network unit specifically includes: optical network unit system equipment and the optical module of the optical network unit.
Preferably, the output pin of the electrical domain dispersion compensation optical module includes:
pin TD + and pin TD-: the optical network unit system equipment is used for receiving an electric signal sent by optical line terminal system equipment or optical network unit system equipment;
pin RD-and pin RD +: the optical line terminal system equipment or the optical network unit system equipment is used for outputting an electric signal subjected to electric domain dispersion compensation; and
the electric domain dispersion compensation optical module is packaged by adopting a miniaturized hot-pluggable SFP optical module structure.
Preferably, the optical module for electrical domain dispersion compensation is applied to an ethernet passive optical network or a gigabit passive optical network of an optical access network.
The embodiment of the utility model provides a because arrange EDC chip in the inside of electric domain dispersion compensation optical module, the electric signal after photoelectric conversion accomplishes the electric domain dispersion compensation at the inside EDC chip of electric domain dispersion compensation optical module; therefore, further attenuation and loss caused by the fact that the electric signal is transmitted from the OLT optical module to the OLT system equipment or from the ONU optical module to the ONU system equipment before electric domain dispersion compensation is carried out are avoided, time delay and distortion of the electric signal are reduced, and therefore the dispersion compensation effect of the electric signal is better.
Furthermore, when the EDC chip fails, only the pluggable OLT optical module on the OLT system equipment needs to be replaced and detected, and the whole OLT system equipment does not need to be replaced and detected, so that the maintenance cost is reduced.
The EDC chip is arranged in a metal structural member of the electric domain dispersion compensation optical module, so that the EDC chip is prevented from being interfered by external electromagnetic interference, and the dispersion compensation effect is further improved; and debugging and algorithm of the electric domain dispersion compensation function are carried out in the electric domain dispersion compensation optical module, so that debugging and testing are more flexible and convenient.
Drawings
Fig. 1 is a block diagram of an internal structure of an optical line terminal in the prior art;
fig. 2a is a block diagram of an internal structure of an optical line terminal according to an embodiment of the present invention;
fig. 2b is a block diagram of an internal structure of an optical line terminal optical module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal circuit of a laser receiving unit according to an embodiment of the present invention;
fig. 4 is a schematic optical path diagram of an optical path component according to an embodiment of the present invention;
fig. 5 is a block diagram of an internal structure of an optical network unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As used in this application, the terms "module," "system," and the like are intended to include a computer-related entity, such as but not limited to hardware, firmware, a combination of hardware and software, or software in execution. For example, a module may be, but is not limited to: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. For example, an application running on a computing device and the computing device may both be a module. One or more modules may reside within a process and/or thread of execution and a module may be localized on one computer and/or distributed between two or more computers.
The utility model discloses an inventor, based on the analysis to prior art scheme, inside the optical module was arranged in to the EDC chip that will be used for electric domain dispersion compensation, the electric domain dispersion compensation of the signal of telecommunication after the inside completion photoelectric conversion of optical module, avoided the signal of telecommunication before carrying out electric domain dispersion compensation, transmitted OLT system equipment and the further attenuation and the loss that cause from the OLT optical module, reduced the time delay and the distortion of the signal of telecommunication, reached better dispersion compensation effect.
The technical solution of the embodiment of the present invention is described in detail below with reference to the accompanying drawings. The embodiment of the utility model provides an electric domain dispersion compensation optical module with electric domain dispersion compensation function, this electric domain dispersion compensation can be applied to as in the OLT that fig. 2a is shown, this OLT specifically includes: at least one OLT optical module 200, OLT system equipment 210;
as shown in fig. 2b, the OLT optical module 200 includes: an optical path component 201, a laser receiving Unit 202, an EDC chip 205, and a first MCU (Micro Control Unit) 207.
The optical path component 201 has a COM end (common port) connected to the optical fiber, and an optical output end connected to an optical input end of the laser receiving unit 202. The optical path block 201 outputs the downstream optical signal transmitted from the optical fiber to the laser receiving unit 202.
The laser receiving unit 202 receives the downlink optical signal output by the optical path component 201 through its optical input end; converting the downlink optical signal output by the optical path component 201 into an electrical signal, amplifying the electrical signal, and outputting the electrical signal to the EDC chip 205 through an electrical signal output end of the laser receiving unit 202;
the EDC chip 205 receives the electric signal output by the laser receiving unit 202 through an electric signal input terminal thereof; after performing electrical domain dispersion compensation on the received electrical signal, the dispersion-compensated electrical signal is output to the OLT optical module 200, and may be specifically output to a MAC or SerDes on the OLT system device.
Specifically, after receiving the electrical signal output by the laser receiving unit 202 through the electrical signal input end of the EDC chip 205, the EDC chip performs sampling analysis on the received electrical signal, determines the time delay and distortion of the electrical signal, and sends the time delay and distortion information of the electrical signal to the first MCU207 through the bus;
after receiving the time delay and distortion information of the electrical signal sent by the EDC chip 205 through the bus, the first MCU207 calculates a dispersion compensation value of the electrical signal according to the time delay and distortion information of the electrical signal, and outputs the calculated dispersion compensation value of the electrical signal to the EDC chip 205 through the bus; the first MCU207 and the EDC chip may be connected to each other through an I2C (Inter-Integrated Circuit) bus or an spi (local peripheral interface) bus; the first MCU207 may be a single chip microcomputer, a controller, a processor, etc. of various types;
the EDC chip 205 performs electrical domain dispersion compensation on the received electrical signal according to the dispersion compensation value of the electrical signal output by the first MCU207, and outputs the dispersion-compensated electrical signal to the MAC or SerDes on the OLT system device.
The laser receiving unit 202 specifically includes: a photodiode detector, a TIA (Transimpedance amplifier), an AGC (Automatic Gain Control) circuit, and a limiter amplifier circuit. For example, the OLT optical module 200 applied to the ethernet passive optical network in the optical access network is configured such that an optical input end of an APD (Avalanche Photo Diode) detector in the laser receiving unit 202 is used as an optical input end of the laser receiving unit 202, and is connected to an optical output end of the optical path component 201, and after a downlink optical signal with a wavelength of 1577nm and a bit rate of 10.3125Gbps output by the optical path component 201 is converted into an electrical signal, the electrical signal output end of the APD detector outputs the electrical signal to an electrical signal input end of the TIA; after the TIA differentiates and amplifies the electric signal output by the APD detector, the electric signal is output to the electric signal input end of the AGC circuit by the electric signal output end of the TIA; the AGC circuit enables the gain of the TIA to be automatically adjusted along with the intensity of the electric signal, and the adjusted electric signal is output to the electric signal input end of the amplitude limiting amplifying circuit from the electric signal output end of the AGC circuit; after the electrical signal output by the AGC is further amplified by the limiting amplifier circuit, the electrical signal is output from the electrical signal output terminal of the limiting amplifier circuit to the electrical signal input terminal of the EDC chip 205. The schematic diagram of the internal circuit of the laser receiving unit 202 is shown in fig. 3, and since the internal circuit of the laser receiving unit 202 is well known to those skilled in the art, it will not be described in detail here. In addition, the OLT optical module 200 applied to the gigabit passive optical network in the optical access network is implemented by using a photodiode detector in the laser receiving unit 202, specifically a PIN photodiode (PIN Photoelectric Diode) detector.
The EDC chip 205 may perform electrical domain dispersion compensation on the electrical signal output from the limiting amplifier circuit in the laser receiver 202 by using a Feed Forward Equalizer (FFE) and/or a Decision Feedback Equalizer (DFE) in the EDC chip 205. Since the internal structure and circuitry of the EDC chip 205 and FFE and DFE are well known to those skilled in the art, they will not be described in detail herein.
Further, the utility model discloses an be applied to electric domain dispersion compensation optical module in OLT, that is to say OLT optical module 200 still includes: laser emitter 203, laser driver 204, second MCU 206.
An electrical signal input end of the laser driver 204 serves as an electrical signal input end of the OLT optical module 200; the laser driver 204 receives the electrical signal sent by the MAC or SerDes on the OLT system device through its electrical signal input terminal, and loads and modulates the electrical signal sent by the MAC or SerDes on the OLT system device to the laser transmitter 203 through the electrical signal output terminal of the laser driver 204.
After the laser transmitter 203 receives the electrical signal loaded and modulated to the laser transmitter 203 by the laser driver 204 through the electrical signal input end of the laser transmitter, the received electrical signal is converted into an uplink optical signal through electro-optical conversion, the uplink optical signal is output to the optical input end of the optical path component 201 from the optical output end of the laser transmitter 203, and the uplink optical signal is coupled into an optical fiber through the optical path component 201 for transmission.
The second MCU206 is connected to the laser transmitter 203, the laser driver 204, and the laser receiving unit 202 through a bus, and is configured to complete status detection and control of the OLT optical module 200, and complete a protocol function that the OLT optical module 200 is to satisfy; specifically, the second MCU206 can detect and control the laser driver 204 to control the emitted light power of the laser emitter 203; the second MCU206 can detect and control the received optical power of the laser receiving unit 202; in addition, the second MCU206 can also detect and control the power supply voltage, temperature, etc. of the OLT optical module 200. The second MCU206 may be various types of single-chip microcomputers, controllers, processors, and the like. The bus may be specifically an I2C bus or an SPI bus.
The optical path component 201 may specifically include: filter F1, filter F2, and filter F3. The optical filter F1 and the optical filter F3 are disposed on a connection line between the optical axis of the COM end of the optical path component 201 and the optical axis of the optical input end of the photodiode detector; the intersection point of the center of the optical filter F1 and the line of the optical axis of the laser emitter 203 and the line of the optical axis of the COM end of the optical path component 201 is superposed, and the included angle between the optical filter F1 and the optical axis of the COM end of the optical path component 201 is 45 degrees; filter F2 is located along the line of the optical axis of laser emitter 203 between filter F1 and the optical output of laser emitter 203. The angle between the filter F2 and the line along which the optical axis of the laser transmitter 203 is located may be 45 to 90 degrees; filter F3 may be angled 45 to 90 degrees from the eye line of the optical axis of the light input end of the photodiode detector. For example, in the OLT optical module 200 applied to the ethernet passive optical network in the optical access network, a downlink optical signal with a wavelength of 1577nm and a bit rate of 10.3125Gbps transmitted by an optical fiber is input to the optical path component 201 from a COM end (common port), and is output to the laser receiving unit 202 after being transmitted by the optical filter F1 and the optical filter F3; the optical filter F3 blocks optical signals of wavelengths other than the downstream optical signal. An uplink optical signal with a wavelength of 1310nm and a bit rate of 1.25Gbps emitted by the laser transmitter 203 is input into the optical path component 201, and is output from the COM end to the optical fiber for transmission after being transmitted by the optical filter F2 and reflected by the optical filter F1. Wherein the optical filter F2 blocks the optical signal reflected or diffusely reflected to the laser transmitter 203. The Filter F1, the Filter F2, and the Filter F3 may be WBF (Wavelength blocking Filter). The optical path diagram of the optical path component 201 is shown in fig. 4; since the optical path of the optical path assembly 201 is well known to those skilled in the art, it will not be described in detail herein.
In addition, the laser driver 204 of the OLT optical module 200 applied in the ethernet passive optical network of the optical access network loads and modulates the electrical signal with the bit rate of 1.25Gpbs sent by the MAC or SerDes on the OLT system equipment to the laser transmitter 203. The laser transmitter 203 electro-optically converts the received electrical signal with the bit rate of 1.25Gpbs, converts the electrical signal into an uplink optical signal with a wavelength of 1310nm and a bit rate of 1.25Gpbs, and couples the uplink optical signal into an optical fiber through the optical path component 201 for transmission. The internal circuitry of the laser driver 204 and the laser transmitter 203 is well known to those skilled in the art and will not be described in detail herein.
Further, the second MCU206 may also be connected to the MAC or SerDes on the OLT system device through a bus; the MAC or SerDes on the OLT system device may be controlled by a bus command and implement the power saving function of the OLT optical module 200.
After the OLT optical module 200 of the ethernet passive optical network applied to the receiving end of the optical fiber transmission system is packaged, the definition of the Pin (Pin) connected to the external device, such as the MAC or SerDes on the OLT system device, is as shown in table 1 below:
TABLE 1
As can be seen from table 1 above, the number of output pins of the OLT optical module 200 after packaging is 20. The pins related to the communication function of the OLT optical module 200 include:
pin 18 and pin 19, i.e., pin TD + and pin TD-: the optical line terminal is used for receiving an electrical signal sent by the MAC or SerDes on the OLT system equipment, namely, the MAC or SerDes on the OLT system equipment sends an electrical signal with a bit rate of 1.25Gpbs to the laser driver through a pin 18 and a pin 19;
pin 12 and pin 13, i.e. pin RD-and pin RD +: the optical module is configured to output an electrical signal after electrical domain dispersion compensation to the MAC or SerDes on the OLT system device, that is, the MAC or SerDes on the OLT system device receives an electrical signal output after electrical domain dispersion compensation is completed by the EDC chip of the OLT optical module 200 through the pin 12 and the pin 13.
The relevant pins for controlling the OLT optical module 200 include:
pin 4 and pin 5, i.e., pin SDA and pin SCL: and the MAC or SerDes on the OLT system equipment realizes communication with the second MCU through a pin 4 and a pin 5. Specifically, the MAC or SerDes on the OLT system device sends an instruction to the second MCU through pin 4 and pin 5, and receives data returned by the second MCU through pin 4 and pin 5.
Other pins of the OLT optical module 200 are well known to those skilled in the art and will not be described in detail herein.
In addition, as shown in fig. 5, the present invention provides an Optical module for electrical domain dispersion compensation, which can also be applied to an Optical Network Unit (ONU), specifically an ONU Optical module. The ONU comprises an ONU optical module and ONU system equipment; the ONU optical module includes the optical path component 201, a laser receiving Unit 202, an EDC chip 205, a first MCU207, a laser transmitter 203, a laser driver 204, and a second MCU (Micro Control Unit) 206. After the ONU optical module of the ethernet passive optical network applied to the receiving end of the optical fiber transmission system is packaged, a Pin (Pin) connecting the ONU optical module with an external device, such as an MAC or a SerDes on the ONU system device, is defined as shown in table 1 above.
Further, when the electrical domain dispersion compensation optical module is packaged, an SFP (small form-factor Pluggable) optical module structure can be adopted, so that the volume of the electrical domain dispersion compensation optical module can be effectively reduced, and the internal space of the OLT or the ONU can be saved.
In the embodiment of the utility model, the EDC chip is arranged in the electric domain dispersion compensation optical module, and the electric domain dispersion compensation of the electric signal after the photoelectric conversion is completed by the EDC chip in the electric domain dispersion compensation optical module; therefore, further attenuation and loss caused by the fact that the electric signal is transmitted from the OLT optical module to the OLT system equipment or from the ONU optical module to the ONU system equipment before electric domain dispersion compensation is carried out are avoided, time delay and distortion of the electric signal are reduced, and therefore the dispersion compensation effect of the electric signal is better.
Furthermore, when the EDC chip fails, only the pluggable OLT optical module on the OLT system equipment needs to be replaced and detected, and the whole OLT system equipment does not need to be replaced and detected, so that the maintenance cost is reduced.
The EDC chip is arranged in a metal structural member of the electric domain dispersion compensation optical module, so that the EDC chip is prevented from being interfered by external electromagnetic interference, and the dispersion compensation effect is further improved; and debugging and algorithm of the electric domain dispersion compensation function are carried out in the electric domain dispersion compensation optical module, so that debugging and testing are more flexible and convenient.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer readable storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An optical module for electrical domain dispersion compensation, comprising: the device comprises an optical path component, a laser receiving unit and an electric domain dispersion compensation EDC chip; wherein,
the common COM end of the optical path component is connected with an optical fiber, the optical output end of the optical path component is connected with the optical input end of the laser receiving unit, and the optical path component outputs a downlink optical signal transmitted from the optical fiber to the laser receiving unit;
the electrical signal output end of the laser receiving unit is connected with the electrical signal input end of the EDC chip, and the laser receiving unit converts the downlink optical signal output by the optical path component into an electrical signal and outputs the electrical signal to the EDC chip;
and the EDC chip outputs the electric domain dispersion compensation optical module after performing electric domain dispersion compensation on the electric signal output by the laser receiving unit.
2. The electrical domain dispersion compensation optical module of claim 1, wherein the laser receiving unit specifically comprises: the device comprises a photodiode detector, a transimpedance amplifier, an automatic gain control circuit and an amplitude limiting amplification circuit; wherein,
the optical input end of the photodiode detector is used as the optical input end of the laser receiving unit and is connected with the optical output end of the optical path component, and the electrical signal output end of the photodiode detector is connected with the electrical signal input end of the transimpedance amplifier; the photodiode detector converts the downlink optical signal output by the optical path component into an electrical signal and outputs the electrical signal to the transimpedance amplifier;
the electric signal output end of the transimpedance amplifier is connected with the electric signal input end of the automatic gain control circuit; the transimpedance amplifier performs difference and amplification on the electric signal output by the photodiode detector and outputs the electric signal to the automatic gain control circuit;
the electric signal output end of the automatic gain control circuit is connected with the electric signal input end of the amplitude limiting amplifying circuit; the automatic gain control circuit enables the gain of the trans-impedance amplifier to be automatically adjusted along with the intensity of the electric signal and outputs the adjusted electric signal to the amplitude limiting amplifying circuit;
an electric signal output end of the amplitude limiting amplifying circuit is used as an electric signal output end of the laser receiving unit and is connected with an electric signal input end of the EDC chip; and the amplitude limiting amplifying circuit amplifies the electric signal output by the automatic gain control circuit and outputs the amplified electric signal to the EDC chip.
3. The electrical domain dispersion compensation optical module of claim 2,
the EDC chip specifically comprises a forward feedback equalizer and/or a decision feedback equalizer.
4. The electrical domain dispersion compensation optical module of claim 3, further comprising: a laser emitter, a laser driver;
the electrical signal input end of the laser driver is used as the electrical signal input end of the electrical domain dispersion compensation optical module, and the electrical signal output end of the laser driver is connected with the electrical signal input end of the laser transmitter and used for loading and modulating the electrical signal input from the electrical signal input end of the electrical domain dispersion compensation optical module to the laser transmitter;
the light output end of the laser transmitter is connected with the light input end of the light path component; and the laser transmitter converts the electric signal subjected to loading modulation into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission.
5. The electrical domain dispersion compensation optical module of claim 4, wherein the optical path component specifically comprises: a filter F1, a filter F2, and a filter F3; wherein,
the optical filter F1 and the optical filter F3 are arranged on a connecting line of an optical axis of the COM end of the optical path component and an optical axis of the optical input end of the photodiode detector; the center of the optical filter F1 coincides with the intersection point of the line of the optical axis of the laser emitter and the line of the optical axis of the COM end of the optical path component, and the included angle between the optical filter F1 and the optical axis of the COM end of the optical path component is 45 degrees; the downlink optical signal transmitted from the optical fiber is input from the COM end of the optical path component, and then is output to a photodiode detector in the laser receiving unit through the transmission action of an optical filter F1 and an optical filter F3; the optical filter F3 is used for blocking optical signals with other wavelengths except the downlink optical signal;
a filter F2 is located along the line of the optical axis of the laser emitter between the filter F1 and the optical output of the laser emitter; after an uplink optical signal emitted by the laser emitter is input into the optical path component, the uplink optical signal is output to the optical fiber from the COM end of the optical path component for transmission through the transmission of the optical filter F2 and the reflection of the optical filter F1; wherein the optical filter F2 blocks the optical signal reflected or diffusely reflected to the laser emitter.
6. The electrical domain dispersion compensation optical module of claim 5, wherein a first Micro Control Unit (MCU) is connected to the EDC chip through a bus; and
the EDC chip judges time delay and distortion of the electric signal output by the laser receiving unit and sends the judged time delay and distortion information to the first MCU through the bus;
the first MCU calculates a dispersion compensation value according to the received time delay and distortion information and outputs the dispersion compensation value to the EDC chip through the bus;
and the EDC chip performs electric domain dispersion compensation on the electric signal output by the laser receiving unit according to the received dispersion compensation value and outputs the electric domain dispersion compensation optical module.
7. The electrical domain dispersion compensation optical module of claim 5, wherein a second Micro Control Unit (MCU) is connected with the laser transmitter, the laser driver and the laser receiving unit through a bus; the second MCU is used for completing the state detection and control of the electric domain dispersion compensation optical module and completing the protocol function to be met by the electric domain dispersion compensation optical module.
8. The electrical domain dispersion compensation optical module of any one of claims 1-7, wherein the electrical domain dispersion compensation optical module is in particular an optical line termination optical module in an optical line termination; wherein, the optical line terminal specifically includes: the optical line terminal system comprises optical line terminal system equipment and at least one optical line terminal optical module;
or, the electric domain dispersion compensation optical module is specifically an optical network unit optical module in an optical network unit; the optical network unit specifically includes: optical network unit system equipment and the optical module of the optical network unit.
9. The electrical domain dispersion compensation optical module of claim 8, wherein its output pin comprises:
pin TD + and pin TD-: the optical network unit system equipment is used for receiving an electric signal sent by optical line terminal system equipment or optical network unit system equipment;
pin RD-and pin RD +: the optical line terminal system equipment or the optical network unit system equipment is used for outputting an electric signal subjected to electric domain dispersion compensation; and
the electric domain dispersion compensation optical module is packaged by adopting a miniaturized hot-pluggable SFP optical module structure.
10. The optical module for electrical domain dispersion compensation of claim 9, wherein the optical module for electrical domain dispersion compensation is applied in an ethernet passive optical network or a gigabit passive optical network of an optical access network.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN2013202757479U CN203313192U (en) | 2013-05-20 | 2013-05-20 | An electric field chromatic dispersion compensation optical module |
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