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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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 invention relates to the technical field of optical fiber communication, in particular to an optical module and an electric domain dispersion compensation method thereof.
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 inventor of the present invention found that the prior art electrical domain dispersion compensation method has poor compensation effect on the electrical signal; 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.
Therefore, it is necessary to provide an electrical domain dispersion compensation method having a better dispersion compensation effect on an electrical signal converted from an optical signal transmitted through an optical fiber.
Disclosure of Invention
The embodiment of the invention provides an optical module and an electric domain dispersion compensation method thereof, so that an electric signal converted from an optical signal transmitted by an optical fiber has a better dispersion compensation effect.
According to an aspect of the present invention, there is provided a light module including: the device comprises a light path component, a laser receiving unit, an EDC chip and a first MCU; wherein,
the laser receiving unit receives a downlink optical signal transmitted from an optical fiber through the optical path component, converts the downlink optical signal into an electrical signal, and amplifies and outputs the electrical signal to the EDC chip;
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;
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;
and the EDC chip outputs the electric signal output by the laser receiving unit after electric domain dispersion compensation according to the received dispersion compensation value.
Preferably, the optical module 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; and
the optical line terminal optical module further comprises: the laser emitter, the laser driver and the second MCU are arranged;
the laser driver receives an electric signal sent by the MAC or the SerDes in the optical line terminal system equipment and loads and modulates the received electric signal to the laser transmitter;
the laser transmitter converts the loaded and modulated electric signal into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission;
the second MCU is used for completing the state detection and control of the optical module and completing the protocol function to be met by the optical module.
Preferably, the optical module is an optical module of an optical network unit 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; and
the optical module of the optical network unit further comprises: the laser emitter, the laser driver and the second MCU are arranged;
the laser driver receives an electric signal sent by the MAC or the SerDes in the optical network unit system equipment, and loads and modulates the received electric signal to the laser transmitter;
the laser transmitter converts the loaded and modulated electric signal into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission;
the second MCU is used for completing the state detection and control of the optical module and completing the protocol function to be met by the optical module.
Preferably, the optical path component specifically includes: a filter F1, a filter F2, and a filter F3; wherein,
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 the laser receiving unit through the transmission action of the optical filter F1 and the optical filter F3; the optical filter F3 is used for blocking optical signals with other wavelengths except the downlink optical signal;
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 laser receiving unit specifically includes: the device comprises a photodiode detector, a trans-impedance amplifier, an automatic gain control circuit and an amplitude limiting amplification circuit.
Preferably, the EDC chip specifically includes a feedforward equalizer and/or a decision feedback equalizer.
Preferably, the optical module output pin 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 optical module is packaged by adopting an SFP optical module structure.
According to another aspect of the present invention, there is also provided an optical module electrical domain dispersion compensation method, including:
the laser receiving unit of the optical module receives a downlink optical signal transmitted from an optical fiber through an optical path component of the optical module, converts the downlink optical signal into an electrical signal, and amplifies and outputs the electrical signal to an EDC chip of the optical module;
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 a first MCU of the optical module;
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;
and the EDC chip outputs the electric signal output by the laser receiving unit after electric domain dispersion compensation according to the received dispersion compensation value.
Preferably, the optical module is an optical line terminal optical module in an optical line terminal; and
the EDC chip outputs the electrical signal output by the laser receiving unit after performing electrical domain dispersion compensation according to the received dispersion compensation value, specifically:
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 MAC or SerDes on the optical line terminal system equipment in the optical line terminal.
Preferably, the optical module is an optical module of an optical network unit in an optical network unit; and
the EDC chip outputs the electrical signal output by the laser receiving unit after performing electrical domain dispersion compensation according to the received dispersion compensation value, specifically:
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 MAC or SerDes on optical network unit system equipment in the optical network unit.
According to the embodiment of the invention, the EDC chip is arranged in the optical module, and the electric signal after photoelectric conversion is subjected to electric domain dispersion compensation in the EDC chip in the optical module, so that 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 the electric signal is subjected to electric domain dispersion compensation are avoided, and the time delay and distortion of the electric signal are reduced, so that 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 part of the optical module, so that the EDC chip is prevented from being subjected to 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 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 the 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 assembly 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 by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with 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.
Based on the analysis of the prior art, the inventor of the present invention considers that the EDC chip for electrical domain dispersion compensation is placed inside the optical module, and the electrical domain dispersion compensation of the electrical signal after photoelectric conversion is completed inside the optical module, thereby avoiding further attenuation and loss caused by the transmission of the electrical signal from the OLT optical module to the OLT system device before the electrical domain dispersion compensation is performed, reducing the time delay and distortion of the electrical signal, and achieving a better dispersion compensation effect.
The technical solution of the embodiments of the present invention is described in detail below with reference to the accompanying drawings. An embodiment of the present invention provides an optical module with an electric domain dispersion compensation function, where the optical module may be applied to an OLT shown in fig. 2a, and the 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.
Wherein the optical path component 201 is connected with an optical fiber;
the laser receiving unit 202 receives the downlink optical signal transmitted from the optical fiber through the optical path component 201; converting the received downlink optical signal into an electrical signal, amplifying the electrical signal, and outputting the amplified electrical signal to the EDC chip 205;
the EDC chip 205 receives the electric signal output by the laser receiving unit 202; and after carrying out electric domain dispersion compensation on the received electric signals, outputting the electric signals subjected to dispersion compensation to the MAC or SerDes on the OLT system equipment.
Specifically, after receiving the electrical signal output by the laser receiving unit 202, the EDC chip 205 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 MCU 207;
after receiving the time delay and distortion information of the electrical signal sent by the EDC chip 205, 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; the first MCU207 and the EDC chip may be connected to each other through an Inter-Integrated Circuit (Inter-Integrated Circuit) bus or a serial peripheral interface (spi) 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 is applied to an ethernet passive optical network of an optical access network, and the photodiode detector in the laser receiving unit 202 is specifically an APD (Avalanche photodiode) detector; the APD detector converts the downlink optical signal with the wavelength of 1577nm and the bit rate of 10.3125Gbps output by the optical path component 201 into an electrical signal; the TIA outputs the electrical signal converted by the APD detector after differentiating and amplifying; the AGC circuit enables the gain of the TIA to be automatically adjusted along with the intensity of the electric signal; the limiter amplifier circuit further amplifies the electric signal output from the AGC and outputs the amplified electric signal to 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 may also be applied to a gigabit passive optical network in an optical access network, and the photodiode detector of the laser receiving unit 202 may be 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 optical module with dispersion compensation function applied in the OLT of the present invention, that is, the OLT optical module 200, further includes: laser emitter 203, laser driver 204, second MCU 206.
The laser driver 204 receives the electrical signal sent by the MAC or SerDes on the OLT system equipment, and applies modulation to the laser transmitter 203.
After receiving the electrical signal loaded and modulated to the laser transmitter 203 by the laser driver 204, the laser transmitter 203 converts the received electrical signal into an uplink optical signal through electro-optical conversion, outputs the uplink optical signal to the optical path component 201, and couples the uplink optical signal into an optical fiber through the optical path component 201 for transmission.
The second MCU206 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 needs 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 optical path component 201 may specifically include: filter F1, filter F2, and filter F3. 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 component 201 and the positional relationship of the filters are well known to those skilled in the art, they will not be described in detail here.
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.
The second MCU206 implements the status detection and control of the OLT optical module 200 through the bus, and completes the protocol functions that the OLT optical module 200 needs to satisfy. The bus may be specifically an I2C bus or an SPI bus.
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 Optical module with a dispersion compensation function provided by the present invention 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 optical module with the electric domain dispersion compensation function is packaged, an SFP (Small Form-factor Pluggable) optical module structure can be adopted, so that the volume of the optical module with the electric domain dispersion compensation function can be effectively reduced, and the internal space of the OLT or the ONU is saved.
In the embodiment of the invention, the EDC chip is arranged in the optical module, and the electric signal after photoelectric conversion is subjected to electric domain dispersion compensation in the EDC chip in the 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 part of the optical module, so that the EDC chip is prevented from being subjected to 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 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 those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A light module, comprising: the device comprises a light path component, a laser receiving unit, an EDC chip and a first MCU; wherein,
the laser receiving unit receives a downlink optical signal transmitted from an optical fiber through the optical path component, converts the downlink optical signal into an electrical signal, and amplifies and outputs the electrical signal to the EDC chip;
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;
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;
and the EDC chip outputs the electric signal output by the laser receiving unit after electric domain dispersion compensation according to the received dispersion compensation value.
2. Optical module according to claim 1, characterized in that the 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; and
the optical line terminal optical module further comprises: the laser emitter, the laser driver and the second MCU are arranged;
the laser driver receives an electric signal sent by the MAC or the SerDes in the optical line terminal system equipment and loads and modulates the received electric signal to the laser transmitter;
the laser transmitter converts the loaded and modulated electric signal into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission;
the second MCU is used for completing the state detection and control of the optical module and completing the protocol function to be met by the optical module.
3. The optical module according to claim 1, wherein the optical module is 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; and
the optical module of the optical network unit further comprises: the laser emitter, the laser driver and the second MCU are arranged;
the laser driver receives an electric signal sent by the MAC or the SerDes in the optical network unit system equipment, and loads and modulates the received electric signal to the laser transmitter;
the laser transmitter converts the loaded and modulated electric signal into an uplink optical signal, and the uplink optical signal is coupled into an optical fiber through the optical path component for transmission;
the second MCU is used for completing the state detection and control of the optical module and completing the protocol function to be met by the optical module.
4. A light module according to any one of claims 1 to 3, characterized in that the light path component comprises in particular: a filter F1, a filter F2, and a filter F3; wherein,
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 the laser receiving unit through the transmission action of the optical filter F1 and the optical filter F3; the optical filter F3 is used for blocking optical signals with other wavelengths except the downlink optical signal;
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.
5. The optical module according to any one of claims 1 to 3, wherein the laser receiving unit specifically includes: the device comprises a photodiode detector, a trans-impedance amplifier, an automatic gain control circuit and an amplitude limiting amplification circuit.
6. A light module as claimed in any one of claims 1 to 3,
the EDC chip specifically comprises a forward feedback equalizer and/or a decision feedback equalizer.
7. A light module as claimed in claim 2 or 3, characterized in that its output pins comprise:
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 optical module is packaged by adopting an SFP optical module structure.
8. A method for compensating for electrical domain dispersion of an optical module, comprising:
the laser receiving unit of the optical module receives a downlink optical signal transmitted from an optical fiber through an optical path component of the optical module, converts the downlink optical signal into an electrical signal, and amplifies and outputs the electrical signal to an EDC chip of the optical module;
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 a first MCU of the optical module;
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;
and the EDC chip outputs the electric signal output by the laser receiving unit after electric domain dispersion compensation according to the received dispersion compensation value.
9. The method for compensating electrical domain dispersion of an optical module according to claim 8, wherein the optical module is an optical line termination optical module in an optical line termination; and
the EDC chip outputs the electrical signal output by the laser receiving unit after performing electrical domain dispersion compensation according to the received dispersion compensation value, specifically:
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 MAC or SerDes on the optical line terminal system equipment in the optical line terminal.
10. The method for compensating electrical domain dispersion of an optical module according to claim 8, wherein the optical module is an onu optical module in an onu; and
the EDC chip outputs the electrical signal output by the laser receiving unit after performing electrical domain dispersion compensation according to the received dispersion compensation value, specifically:
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 MAC or SerDes on optical network unit system equipment in the optical network unit.
Priority Applications (1)
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