CN111262631B - Management information processing method, optical module, ONU and application system thereof - Google Patents
Management information processing method, optical module, ONU and application system thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
Abstract
A management information processing method, an optical module, an ONU and an application system thereof belong to the technical field of WDM-PON access, and comprise the following steps: the modulation and demodulation unit is used for modulating the digital signal to obtain a low-frequency signal; a coupler that loads a bias voltage that couples the low frequency signal to the MZM; the optical transmitting unit is internally provided with an MZM to load a low-frequency signal onto an optical signal for transmission; the optical path driving unit drives the light emitting unit and controls the modulation of the MZM on the optical signal; the optical receiving unit receives the optical signal loaded with the low-frequency signal to perform photoelectric conversion, and strips the low-frequency signal from the high-speed signal by using the RSSI low-frequency characteristic; the modulation and demodulation unit demodulates the stripped low-frequency signal to obtain a digital signal, and the control processing unit processes the digital signal to obtain a processing result. The invention has the beneficial effects that: the WDM-PON system is compatible with high-speed signals and does not interfere with each other, meanwhile, the low-frequency signals are loaded on the high-speed signals to be sent, the low-frequency signals are stripped from the high-speed signals to be received and processed, and the optical module is effectively managed and maintained.
Description
Technical Field
The invention relates to the technical field of WDM-PON access, in particular to a management information processing method, an optical module, an ONU and an application system thereof.
Background
At present, the research on the 5G network forms the first wave and enters the key stage of the research and development of the technical standard. Compared with the 4G technology, the performance of the 5G network is remarkably improved in the aspects of throughput rate, time delay, connection quantity and the like, and meanwhile, new challenges are provided for the forward transmission network, such as a large number of new requirements for dense optical fiber deployment, higher transmission broadband, lower time delay and the like. The WR-WDM-PON (Wavelength-Division Multiplexing-Passive Optical Network) combines the characteristics of WR (Wavelength-routing), WDM (Wavelength-Division Multiplexing) and PON (Passive Optical Network) topological structures, has the advantages of high bandwidth, low time delay, fiber saving, simple operation and maintenance, low cost and the like, has unique advantages in the aspect of 5G fronthaul application, and is a preferred access technology of a 5G Network.
The WR-WDM-PON comprises an OLT (Optical Line Terminal), an ODN (Optical Distribution Network) and an ONU (Optical Network Unit), wherein the small-sized removable module inserted into a card slot of an AAU (Active Antenna Unit) is a module-type ONU, and the module-type ONU is one of Optical modules.
Currently, in the development of a 25G WR-WDM-PON system module type ONU, a ROSA (Receiver Optical Subassembly, Optical receiving module) is used to receive an Optical signal and a TOSA (Transmitter Optical Subassembly, Optical transmitting module) is used to transmit an Optical signal, so as to receive and transmit high-speed data, and a carrier for data transmission is a high-speed signal. The carrier for receiving and sending the management information by the control processing module is a low-frequency signal, and the frequency does not exceed 20MHz at most. How to load the low-frequency signal on the high-speed signal for transmission, the compatibility with the high-speed signal is realized during transmission, the mutual interference is avoided, and the low-frequency signal is stripped from the high-speed signal for receiving and processing, which is a technical problem to be solved. If the problem can not be effectively solved, the management and maintenance of the WR-WDM-PON system can be influenced.
Disclosure of Invention
In view of the defects in the prior art, an object of the present invention is to provide a method for processing management information, an optical module, an ONU, and an application system thereof, which are compatible with a high-speed signal in a WDM-PON system and do not interfere with each other, and simultaneously, load a low-frequency signal onto the high-speed signal for transmission, strip the low-frequency signal from the high-speed signal for reception and processing of management information, and can effectively manage and maintain the optical module.
The invention provides a management information processing method, which comprises the following steps:
an optical signal transmitting direction, in which an optical signal carrying data information is received through an MZM, a low-frequency signal obtained by modulating a digital signal carrying management information is coupled to a bias voltage, the bias voltage is loaded to the MZM, the MZM is controlled by an optical path driving unit to modulate the optical signal, the low-frequency signal is loaded to the optical signal, and the MZM transmits the modulated optical signal loaded with the low-frequency signal;
and in the optical signal receiving direction, receiving the modulated optical signal loaded with the low-frequency signal and converting the optical signal into an electrical signal, wherein the electrical signal comprises a high-speed signal carrying the data information and a low-frequency signal carrying the management information, the low-frequency signal is stripped from the high-speed signal by using the low-frequency characteristic of a preset RSSI and is respectively output, the low-frequency signal is demodulated to obtain the digital signal, and the management information contained in the digital signal is processed to obtain a processing result.
Preferably, in the optical signal transmitting direction, after receiving the high-speed signal carrying the data information and converting the high-speed signal into the optical signal, the optical signal is transmitted to the MZM.
Preferably, in the optical signal receiving direction, after the digital signal is decoded to obtain the carried management information, the management information is processed to obtain the processing result.
A light module, comprising:
the control processing unit is used for encoding the management information into a digital signal and outputting the digital signal; the modem unit is further configured to receive the digital signal output by the modem unit, and process the management information included in the digital signal to obtain a processing result;
the modulation and demodulation unit is used for receiving the digital signal output by the control processing unit, modulating the digital signal to obtain a low-frequency signal and outputting the low-frequency signal; the optical receiver is further configured to receive the low-frequency signal output by the optical receiving unit, demodulate the low-frequency signal to obtain the digital signal, and output the digital signal;
the coupler is used for receiving the low-frequency signal output by the modulation and demodulation unit, coupling the low-frequency signal to a bias voltage and loading the bias voltage to the MZM;
the optical transmitting unit is used for receiving the optical signal carrying data information and the bias voltage through the MZM arranged in the optical transmitting unit, the MZM loads the low-frequency signal onto the optical signal, and the MZM transmits the modulated optical signal loaded with the low-frequency signal;
an optical path driving unit for driving and controlling the light emitting unit, the optical path driving unit controlling the modulation of the received optical signal by the MZM;
and the optical receiving unit is used for receiving the modulated optical signal loaded with the low-frequency signal and transmitted by the light emitting unit at the opposite end and converting the modulated optical signal into an electric signal, wherein the electric signal comprises a high-speed signal carrying the data information and a low-frequency signal carrying the management information, and the low-frequency signal is stripped from the high-speed signal and respectively output by utilizing the low-frequency characteristic of a preset RSSI (received signal strength indicator).
Preferably, the optical transmission unit is configured to receive the high-speed signal carrying the data information through an electrical-to-optical converter built in the optical transmission unit, convert the high-speed signal into the optical signal, and send the optical signal to the MZM built in the optical transmission unit.
Preferably, in the optical signal receiving direction, the control processing unit is further configured to decode the digital signal to obtain the carried management information, and then process the management information to obtain the processing result.
Preferably, the control processing unit receives the management information through a communication interface, and outputs a processing result of the management information through the communication interface.
Preferably, the modem unit is composed of a multiplexer, a transmitting modulator, a digital-to-analog converter, a buffer, a receiving demodulator, a carrier detector, a band-pass filter, a communication interface, an MOD _ IN interface, and an MOD _ OUT interface;
in the optical signal transmitting direction, the digital signal is input to the modulation and demodulation unit through a communication interface, and is modulated into the low-frequency signal after sequentially passing through the multiplexer, the sending modulator, the digital-to-analog converter and the buffer, and the low-frequency signal is output through the MOD _ OUT interface;
and IN the optical signal receiving direction, the low-frequency signal is input into the modulation and demodulation unit through an MOD _ IN interface, sequentially passes through the band-pass filter, the carrier detector, the receiving demodulator and the multiplexer and then is demodulated into the digital signal, and the digital signal is output through a communication interface.
An ONU comprising the optical module.
An application system of an ONU, the application system comprising: the optical line terminal, the optical distribution network and the at least one ONU are connected in sequence.
The invention has the beneficial effects that: the WDM-PON system is compatible with high-speed signals and does not interfere with each other, meanwhile, low-frequency signals are loaded on the high-speed optical signals to be sent, the low-frequency signals are stripped from the high-speed signals to be received and managed, the optical module can be effectively managed and maintained, and the convenience and the high efficiency of operation and maintenance of the WDM-PON in 5G fronthaul business are greatly improved.
Drawings
Fig. 1 is a schematic diagram of an optical module according to an embodiment of the present invention.
Fig. 2 is a schematic processing diagram of an optical module in a light emitting direction according to an embodiment of the invention.
Fig. 3 is a flowchart of a light module in a light emitting direction according to an embodiment of the invention.
Fig. 4 is a schematic view illustrating a process of an optical module in a light receiving direction according to an embodiment of the present invention.
Fig. 5 is a flowchart of an optical module in the light receiving direction according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of the internal processing of the modem unit according to the embodiment of the present invention.
Fig. 7 is a schematic diagram of functional modules of an application system of an ONU according to an embodiment of the present invention.
In the figure: 1-a control processing unit; 2-a modem unit; 3-an optical path driving unit; 4-a light emitting unit; 5-a light receiving unit; a 6-coupler; 7-an optical line terminal; 8-an optical distribution network; 9-module type ONU; 21-a multiplexer; 22-a transmit modulator; 23-a receive demodulator; 24-a digital-to-analog converter; 25-a carrier detector; 26-a buffer; 27-a band-pass filter; 41-an electro-optical converter; 42-MZM; 71-a master control unit; 72-submodule; 73-wavelength multiplexer; 81-athermal arrayed waveguide grating.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
In the conventional WR-WDM-PON system, the module type ONU9 includes modules such as an MCU (micro controller Unit), a ROSA, a TOSA, and a Driver, and cannot realize that a low-frequency signal is loaded on a high-speed signal to be transmitted and a low-frequency signal is stripped from the high-speed signal to be received and processed when the high-speed signal is compatible and does not interfere with each other.
The invention provides a management information processing method, an optical module, an ONU and an application system thereof, and a modulation and demodulation function is added on the basis of the existing optical module. When light emission is carried out, a digital signal carrying management information is modulated into a low-frequency signal and then coupled to a bias voltage, the bias voltage is loaded to a MZM (Mach-Zehnder modulator) 42, a high-speed optical signal is modulated by the MZM42, so that the low-frequency signal coupled to the bias voltage is loaded to the high-speed optical signal for emission, the optical signal is obtained by electro-optical conversion of the high-speed signal, and the low-frequency signal is loaded to the high-speed signal for emission while the compatibility with the high-speed signal is realized.
In the prior art, a Received Signal Strength Indication (RSSI) pin is preset on an optical module, and a Received light power value can be obtained by sampling and calculating the RSSI pin in real time through analog-to-digital conversion (ADC), so as to determine the Strength of a Received light Signal, that is, the Received light Signal Strength Indication is obtained by processing the RSSI pin by the existing optical module. In the invention, when light is received, the low-frequency signal is stripped from the high-speed signal by using the low-frequency characteristic of the RSSI preset on the optical module, the low-frequency signal is demodulated to obtain a digital signal, the management information contained in the digital signal is processed, so that the low-frequency signal and the high-speed signal are respectively received, the management information is processed and fed back, and the processing result can be sent to the specified equipment according to the preset later.
Example one
The present embodiment provides a method for processing a management signal, including performing optical signal transmission in a transmitting direction, and performing optical signal reception in a receiving direction.
In the step of transmitting the optical signal in the transmitting direction, the MZM42 is used for receiving the optical signal carrying the data information, the digital signal carrying the management information is modulated to obtain a low-frequency signal, the low-frequency signal is coupled to the bias voltage through the coupler, the bias voltage is loaded to the MZM42, the MZM42 loads the low-frequency signal to the optical signal, and the MZM42 transmits the modulated optical signal loaded with the low-frequency signal. When the optical module transmits management information, the modulation function is added, so that the low-frequency signal can be loaded on the high-speed signal to be transmitted while the high-speed signal is compatible with the high-speed signal and is not interfered with the high-speed signal.
And in the step of receiving the optical signal in the receiving direction, the modulated optical signal loaded with the low-frequency signal is received and converted into an electric signal, the electric signal comprises a high-speed signal carrying data information and a low-frequency signal carrying management information, the low-frequency signal is stripped from the high-speed signal by utilizing the low-frequency characteristic of the preset RSSI and is respectively output, the low-frequency signal is demodulated to obtain a digital signal, and the management information contained in the digital signal is processed to obtain a processing result. When the optical module transmits the management information, the demodulation function is added, so that the low-frequency signal can be stripped from the high-speed signal for receiving processing, the processing result of the management information contained in the low-frequency signal is obtained, and the processing and feedback of the management information are realized.
Example two
The present embodiment provides an optical module, as shown in fig. 1-2 and 4, including:
and a control processing unit 1 for encoding the management information into a digital signal output in the transmission direction. The modem is further configured to receive the digital signal output by the modem unit 2, and process the management information included in the digital signal to obtain a processing result;
and the modulation and demodulation unit 2 is used for receiving the digital signal output by the control processing unit 1 in the transmitting direction, modulating the digital signal to obtain a low-frequency signal and outputting the low-frequency signal to the coupler 6. In the receiving direction, the receiving unit is configured to receive the low-frequency signal output by the light receiving unit 5, demodulate the low-frequency signal to obtain a digital signal, and output the digital signal to the control processing unit 1.
And the coupler 6 is used for receiving the low-frequency signal output by the modulation and demodulation unit 2 in the transmitting direction, coupling the low-frequency signal to the bias voltage, and then loading the bias voltage to the MZM 42.
The optical transmitting unit 4 is configured to convert a high-speed signal carrying data information into an optical signal through an electro-optical converter 41 built in the optical transmitting unit in a transmitting direction, where the electro-optical converter 41 sends the optical signal to the MZM42, the MZM42 receives the optical signal carrying the data information and a bias voltage, the MZM42 loads a low-frequency signal to the optical signal when modulating the optical signal by using the bias voltage, and the MZM42 transmits the modulated optical signal loaded with the low-frequency signal. The electro-optical converter 41 may employ a Laser Diode (LD). The high-speed signal is loaded on the electro-optical converter 41 in the form of a high-speed differential signal, and the signal intensity and amplitude of the high-speed differential signal are adjustable. The quality of the high-speed signal can be improved by changing the amplitude of the output high-speed data differential signal.
The optical path driving unit 3 is used for driving and controlling the light emitting unit 4, can be arranged inside the light emitting unit 4 in a matching way with the MZM42, and can also be arranged outside the light emitting unit 4, the optical path driving unit 3 provides current voltage for the light emitting unit 4, and controls the MZM42 to modulate received optical signals by changing the current and the voltage, so that the emission power intensity and the signal amplitude of the optical signals output by the MZM42 are changed.
And the optical receiving unit 5 is used for receiving the modulated optical signal loaded with the low-frequency signal and transmitted by the light transmitting unit 4 at the opposite end in the receiving direction, converting the modulated optical signal into an electric signal, wherein the electric signal comprises a high-speed signal carrying data information and a low-frequency signal carrying management information, and stripping the low-frequency signal from the high-speed signal by using the low-frequency characteristic of the preset RSSI and respectively outputting the low-frequency signal. The square box in fig. 4 where the low frequency signal and the optical monitoring signal are collected is used to indicate that the RSSI signal is divided into two paths (one path is used as the low frequency signal to the modem unit 2, and the other path is used as the optical signal to be monitored to the control processing unit 1).
The modulation and demodulation unit 2 is added to the existing optical module, has the functions of sending code selection, sending level setting and the like, and is used for modulating the management information into a low-frequency signal in the transmitting direction and demodulating the low-frequency signal into the management information in the receiving direction.
The control processing unit 1 decodes the digital signal from the modem unit 2 to obtain corresponding management information, encapsulates the management information according to a specific management protocol (such as OMCI), processes the management information to obtain a processing result, and feeds back the processing result to a user through an output port for processing.
The power supply of the optical module is connected with an external power supply so as to adjust the voltage, the current and the like of the input optical module, so as to meet the power-on specification of the optical module and supply power to the optical module.
EXAMPLE III
Based on the first to second embodiments, as shown in fig. 2 to 3, the optical signal transmitting step includes:
step S101, the control processing unit 1 encodes the management information into a digital signal and sends the digital signal to the modulation and demodulation unit 2;
step S102, modulating the digital signal into a low-frequency signal by the modulation and demodulation unit 2 and sending the low-frequency signal to the coupler 6;
step S103, after the coupler 6 couples the low-frequency signal to a bias voltage, the bias voltage is loaded to the MZM42 arranged in the optical emission unit 4;
step S104, an electro-optical converter 41 arranged in the light emitting unit 4 converts the high-speed signal carrying the data information into an optical signal, and the electro-optical converter 41 sends the optical signal to the MZM 42;
step S105, when the MZM42 modulates the optical signal with the bias voltage, loading the low frequency signal to the high speed optical signal, and the MZM42 transmits the modulated optical signal loaded with the low frequency signal.
Wherein steps S101-S103 and step S104 may be performed simultaneously. The modulation of the optical signal by the MZM42 comprises modulation of the intensity and amplitude of the optical signal.
As shown in fig. 4-5, the optical signal receiving step includes:
step S201, the light receiving unit 5 receives the modulated optical signal loaded with the low frequency signal sent by the light emitting unit 4 of the optical module at the opposite end;
step S202, the light receiving unit 5 performs photoelectric conversion on the optical signal to obtain an electric signal, wherein the electric signal comprises a high-speed signal carrying data information and a low-frequency signal carrying management information;
step S203, the light receiving unit 5 strips the low frequency signal from the high speed signal by using the low frequency characteristic of the preset RSSI and outputs the low frequency signal respectively;
step S204, after receiving the low-frequency signal sent by the light receiving unit 5, the modulation and demodulation unit 2 demodulates the low-frequency signal to obtain a digital signal, and the modulation and demodulation unit 2 sends the digital signal to the control processing unit 1;
step S205, the control processing unit 1 decodes the digital signal to obtain management information;
step S206, the control processing unit 1 processes the management information to obtain a processing result.
In this embodiment, the management signal processing method includes transmitting an optical signal in a transmitting direction and receiving an optical signal in a receiving direction.
The management information is modulated to obtain a low-frequency signal in the optical signal transmitting direction, the low-frequency signal passes through a coupler 6 and is then transmitted to the MZM42 through being coupled to the bias voltage, the MZM42 modulates the optical signal by using the bias voltage and loads the low-frequency signal to the high-speed optical signal, and the low-frequency signal is loaded to the high-speed optical signal and is transmitted while the high-speed signal is compatible and not interfered with each other.
In the optical signal transmitting direction, after the low-frequency signal is stripped from the high-speed signal by using the low-frequency characteristic of the RSSI, the high-speed signal is directly output, the low-frequency signal is demodulated to obtain management information, and the control processing unit 1 processes the management information, so that the control processing unit 1 can process and feed back the management information, the optical module can be effectively managed and maintained, and the operation and maintenance convenience and high efficiency of the WDM-PON in the 5G fronthaul service are greatly improved.
Example four
Based on the first to third embodiments, as shown in fig. 2, the digital signal carrying the management information is modulated by the modulation and demodulation unit 2 to obtain the low frequency signal in the optical signal transmitting direction.
As shown in fig. 4, in the optical signal receiving direction, the low frequency signal is demodulated by the modem unit 2 to obtain a digital signal.
As shown in fig. 6, the modem unit 2 includes: MUX (multiplexer, multiplexer 21), Transmit Modulator (Transmit Modulator 22), DAC (D/a converter, digital-to-analog converter 24), Buffer (Buffer 26), Receive Demodulator (Receive Demodulator 23), Carrier detector (Carrier detector 25), Bandpass Filter (band pass Filter 27), communication interface (SPI interface, IIC interface, ADC interface, DAC interface, GPIO interface, MDIO interface, UART interface, and/or USB interface may be used), MOD _ IN interface, and MOD _ OUT interface. The modem module 2 has functions of transmitting code selection, transmitting level setting, etc., and has the capability of modulating a digital signal into a low-frequency pulse signal and demodulating the digital signal from the low-frequency pulse signal.
In the optical signal transmitting direction, a digital signal is input to the modem unit 2 through the communication interface, and is modulated into a low-frequency signal after sequentially passing through the multiplexer 21, the transmission modulator 22, the digital-to-analog converter 24 and the buffer 26, and the low-frequency signal is output through the MOD _ OUT interface.
IN the optical signal reception direction, the low-frequency signal is input to the modem unit 2 through the MOD _ IN interface, demodulated into a digital signal through the bandpass filter 27, the carrier detector 25, the reception demodulator 23, and the multiplexer 21 IN this order, and the digital signal is output through the communication interface.
EXAMPLE five
Based on the first to fourth embodiments, the control processing unit 1 is also provided with a communication interface (may adopt an SPI interface, an IIC interface, an ADC interface, a DAC interface, a GPIO interface, an MDIO interface, a UART interface, and/or a USB interface), and the control processing unit 1 establishes communication connection with the external device and the modem unit 2 through different communication interfaces. In addition, since the control processing unit 1 is also used for performing unified management control on other devices and operation units in the optical module, the control processing unit 1 is further provided with a communication interface for connecting with other devices and operation units in the optical module, including the communication interface connected with the modem unit 2.
In the present embodiment, as shown in fig. 2, the optical signal emission direction: the control processing unit 1 receives management information sent by an external device through a communication interface, the control processing unit 1 receives the management information and encodes the management information into a digital signal, the control processing unit 1 sends the digital signal to the modulation and demodulation unit 2 through the communication interface, the modulation and demodulation unit 2 receives the digital signal and modulates the digital signal into a low-frequency signal, the low-frequency signal passes through the coupler 6 and then is sent to the MZM42 in the light emitting unit 4 through bias voltage, the MZM42 loads the low-frequency signal onto a high-speed optical signal, and the light emitting unit 4 sends the modulated optical signal carrying the data information and the management information.
As shown in fig. 3, the optical signal receiving direction: the optical receiving unit 5 receives an optical signal carrying data information and management information, the optical receiving unit 5 completes photoelectric conversion of the optical signal to obtain an electric signal, the optical receiving unit 5 strips a low-frequency signal from a high-speed signal by using RSSI characteristics and sends the low-frequency signal to the modulation and demodulation unit 2, the modulation and demodulation unit 2 receives the low-frequency signal and demodulates the low-frequency signal into a digital signal, the modulation and demodulation unit 2 sends the digital signal to the control processing unit 1 through a communication interface, the control processing unit 1 receives the digital signal and decodes the digital signal into the management information, and after processing the management information to obtain a processing result, the control processing unit 1 outputs the processing result of the management information through the communication interface.
EXAMPLE six
Based on the first to fifth embodiments, the ONU includes the optical module, and the ONU is one of the optical modules. The module type ONU9 is employed in the WDM-PON system. The module type ONU9 transmits the modulated optical signal carrying the low frequency signal to the module type ONU9 at the opposite end through the light emitting unit 4, and the module type ONU9 receives the modulated optical signal carrying the low frequency signal transmitted from the module type ONU9 at the opposite end through the light receiving unit 5, and processes the modulated optical signal carrying the low frequency signal to obtain a processing result of the management information.
EXAMPLE seven
Based on the first to sixth embodiments, this embodiment provides an application system for managing signals, as shown in fig. 7, the application system includes: the optical line terminal 7, the optical distribution network 8 and the module type ONU9, which are connected in sequence, can be applied to 5G forward traffic.
The optical line terminal 7 includes: a main control unit 71, a sub-module 72 and a wavelength multiplexer 73 (WM). The submodule 72 here can also use optical modules.
The sub-modules 72 are wavelength tunable and controllable optical modules, a plurality of sub-modules 72 are inserted into card slots of the optical line terminal 7, and the sub-modules 72 are connected with the wavelength multiplexer 73 by branches through optical fibers (λ un/λ dn).
The wavelength multiplexer 73 is a bidirectional functional unit for providing a multiplexing/demultiplexing function between a WDM-PON wavelength channel pair and a channel group.
The optical distribution network 8 is formed by an Athermal Arrayed Waveguide Grating (AAWG) 81, and the optical distribution network 8 is connected to the optical line terminal 7 by optical fibers (λ u1/λ d1, λ u2/λ d2,. λ un/λ dn).
The modular ONU9 is a mobile fronthaul small pluggable module, which is inserted into a card slot of an active antenna processing unit (not shown in the figure), and the modular ONU9 is connected to the athermal arrayed waveguide grating branch of the optical distribution network 8 through an optical fiber (λ un/λ dn).
The management information is input or output from the control processing unit 1 of the module-type ONU9 and processed.
Specifically, the control processing unit 1 receives and processes external management information through the communication interface, and transmits a management information processing result to the outside through the communication interface output port.
The control processing unit 1 receives the management information and encodes the management information into a digital signal, the control processing unit 1 sends the digital signal to the modulation and demodulation unit 2 through a communication interface channel, the modulation and demodulation unit 2 receives the digital signal and modulates the digital signal into a low-frequency signal, the low-frequency signal passes through the coupler 6 and then is sent to the MZM42 in the light emission unit 4 by using bias voltage, the light emission unit 4 of the module type ONU9 completes the emission of the optical signal, the built-in MZM42 loads the low-frequency signal to a high-speed optical signal, and the light emission unit 4 sends the optical signal carrying the data information and the management information.
The optical receiving unit 5 of the module type ONU9 completes the receiving of the optical signal by the module type ONU9 and has the capability of converting the optical signal into the electrical signal, the optical receiving unit 5 completes the photoelectric conversion of the optical signal to obtain the electrical signal, the optical receiving unit 5 strips the low-frequency signal from the high-speed signal by using the RSSI characteristic and sends the low-frequency signal to the modulation and demodulation unit 2, the modulation and demodulation unit 2 receives the low-frequency signal and demodulates the low-frequency signal into the digital signal, the modulation and demodulation unit 2 sends the digital signal to the control processing unit 1 through the SPI channel, the control processing unit 1 receives the digital signal and decodes the digital signal into the management information, and after the management information is processed to obtain the processing result, the processing result is output from the management channel of the control processing unit 1.
The WDM-PON system is compatible with high-speed signals and does not interfere with each other, and meanwhile, low-frequency signals are loaded on the high-speed optical signals to be sent, and the low-frequency signals are stripped from the high-speed signals to be received.
The optical line terminal 7 sends the management information to realize remote real-time management and maintenance of the module ONU9 without manual field management and maintenance of each base station, which is beneficial to effective management and maintenance of the module ONU9 and greatly improves the convenience and high efficiency of operation and maintenance of the WDM-PON system in the 5G fronthaul service.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A method for processing management information, comprising the steps of:
an optical signal transmitting direction, in which an optical signal carrying data information is received through an MZM, a low-frequency signal obtained by modulating a digital signal carrying management information is coupled to a bias voltage, the bias voltage is loaded to the MZM, the MZM is controlled by an optical path driving unit to modulate the optical signal, the low-frequency signal is loaded to the optical signal, and the MZM transmits the modulated optical signal loaded with the low-frequency signal;
and in the optical signal receiving direction, receiving the modulated optical signal loaded with the low-frequency signal and converting the optical signal into an electrical signal, wherein the electrical signal comprises a high-speed signal carrying the data information and a low-frequency signal carrying the management information, the low-frequency signal is stripped from the high-speed signal by using the low-frequency characteristic of a preset RSSI and is respectively output, the low-frequency signal is demodulated to obtain the digital signal, and the management information contained in the digital signal is processed to obtain a processing result.
2. The processing method of claim 1, wherein an optical signal is transmitted in a direction to receive the high-speed signal carrying the data information and converted into the optical signal, and then the optical signal is transmitted to the MZM.
3. The processing method of claim 1, wherein in the optical signal receiving direction, after decoding the digital signal to obtain the carried management information, the management information is processed to obtain the processing result.
4. A light module, comprising:
the control processing unit is used for encoding the management information into a digital signal and outputting the digital signal; the modem is further configured to receive the digital signal output by the modem unit, and process the management information included in the digital signal to obtain a processing result;
the modulation and demodulation unit is used for receiving the digital signal output by the control processing unit, modulating the digital signal to obtain a low-frequency signal and outputting the low-frequency signal; the digital signal processing unit is also used for receiving the low-frequency signal output by the optical receiving unit, demodulating the low-frequency signal to obtain the digital signal and outputting the digital signal;
the coupler is used for receiving the low-frequency signal output by the modulation and demodulation unit, coupling the low-frequency signal to a bias voltage and loading the bias voltage to the MZM;
the optical transmitting unit is used for receiving an optical signal carrying data information and the bias voltage through the MZM arranged in the optical transmitting unit, the MZM loads the low-frequency signal on the optical signal, and the MZM transmits the modulated optical signal loaded with the low-frequency signal;
an optical path driving unit for driving and controlling the light emitting unit, the optical path driving unit controlling the modulation of the received optical signal by the MZM;
and the optical receiving unit is used for receiving the modulated optical signal loaded with the low-frequency signal and transmitted by the light emitting unit at the opposite end and converting the modulated optical signal into an electric signal, wherein the electric signal comprises a high-speed signal carrying the data information and a low-frequency signal carrying the management information, and the low-frequency signal is stripped from the high-speed signal and respectively output by utilizing the low-frequency characteristic of a preset RSSI (received signal strength indicator).
5. The optical module as claimed in claim 4, wherein the optical transmitting unit is configured to receive the high-speed signal carrying the data information through an electro-optical converter built therein, convert the high-speed signal into the optical signal, and send the optical signal to the MZM built therein.
6. The optical module according to claim 4, wherein in the optical signal receiving direction, the control processing unit is further configured to decode the digital signal to obtain the carried management information, and then process the management information to obtain the processing result.
7. The optical module according to claim 4, wherein the control processing unit receives the management information through a communication interface and outputs a processing result of the management information through the communication interface.
8. The optical module according to claim 4, wherein the modem unit is constituted by a multiplexer, a transmission modulator, a digital-to-analog converter, a buffer, a reception demodulator, a carrier detector, a band-pass filter, a communication interface, a MOD _ IN interface, and a MOD _ OUT interface;
in the optical signal transmitting direction, the digital signal is input to the modulation and demodulation unit through a communication interface, and is modulated into the low-frequency signal after sequentially passing through the multiplexer, the sending modulator, the digital-to-analog converter and the buffer, and the low-frequency signal is output through the MOD _ OUT interface;
and IN the optical signal receiving direction, the low-frequency signal is input into the modulation and demodulation unit through an MOD _ IN interface, sequentially passes through the band-pass filter, the carrier detector, the receiving demodulator and the multiplexer and then is demodulated into the digital signal, and the digital signal is output through a communication interface.
9. An ONU comprising the optical module of any of claims 4-8.
10. An application system of an ONU, comprising: an optical line terminal, an optical distribution network and at least one of the ONUs according to claim 9 connected in sequence.
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| CN112260750B (en) * | 2020-09-25 | 2021-09-03 | 烽火通信科技股份有限公司 | Optical module and method capable of improving accuracy of optical modulation communication |
| CN115133998B (en) * | 2021-03-24 | 2024-01-23 | 青岛海信宽带多媒体技术有限公司 | Optical module and wavelength self-adaption method based on message channel |
| CN113114376B (en) * | 2021-03-26 | 2022-07-01 | 广东九联科技股份有限公司 | Optical module of top-modulated signal based on phase modulation and communication method |
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