CN108521299B - Optical fiber wireless fusion communication system for multi-scene application and signal processing method - Google Patents
Optical fiber wireless fusion communication system for multi-scene application and signal processing method Download PDFInfo
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- CN108521299B CN108521299B CN201810601401.0A CN201810601401A CN108521299B CN 108521299 B CN108521299 B CN 108521299B CN 201810601401 A CN201810601401 A CN 201810601401A CN 108521299 B CN108521299 B CN 108521299B
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an optical fiber wireless fusion communication system for multi-scene application, which comprises an OLT plate, an optical fiber, a second wavelength-division multiplexing unit and a plurality of ONU plates, wherein the OLT plate is connected with the plurality of ONU plates through the optical fiber and the second wavelength-division multiplexing unit in sequence. In the invention, the OLT plate is linked with the ONU plate through the standard single-mode fiber and the wave-splitting multiplexing unit, and the high-speed signal is transmitted to the remote ONU plate from the OLT plate, so as to implement multi-scene multi-system signal coverage.
Description
[ technical field ]
The invention belongs to the technical field of information and communication, and particularly relates to an optical fiber wireless fusion communication system and a signal processing method for multi-scene application.
Background art
With the rapid development of Information Communication Technology (ICT), ultra-large broadband optical fiber communication and high-speed mobile access are increasingly receiving attention from the industry, and the convergence of optical fiber technology and wireless technology is the development direction of future communication. However, for the scheme of high-speed microwave optical fiber interconnection and intercommunication among future indoor and outdoor distribution systems, ultra-high-speed optical fiber metropolitan area networks, ultra-high-speed wireless local area networks and novel adjacent base stations, real deep fusion is difficult to achieve based on the current technical platform, and certain limitations exist for application scenes among the systems, so that the system is difficult to achieve the real application to multi-scene optical fiber wireless fusion communication.
Summary of the invention
The first aspect of the present invention is to provide a system in which an OLT block is linked to an ONU block through a standard single-mode optical fiber and a wavelength-division multiplexing unit, a high-speed signal is transmitted from the OLT block to a remote ONU block, and then multi-scene multi-system signal coverage is implemented.
The technical scheme adopted by the invention is as follows: an optical fiber wireless fusion communication system for multi-scene application comprises an OLT plate, an optical fiber, a second wavelength-division-demultiplexing unit and a plurality of ONU plates, wherein the OLT plate is connected with the plurality of ONU plates through the optical fiber and the second wavelength-division-demultiplexing unit in sequence,
the OLT plate comprises a tunable radio frequency generator, a primary frequency-up processing unit, a secondary frequency-up processing unit, an optical modulator MZM 01, an optical fiber amplifier EDFA, a first wavelength division multiplexing unit and a first wavelength division multiplexing unit, wherein the tunable radio frequency generator is sequentially connected with the primary frequency-up processing unit, the secondary frequency-up processing unit, the optical fiber modulator MZM 01, the optical fiber amplifier EDFA, the first wavelength division multiplexing unit and the first wavelength division multiplexing unit; the OLT plate further comprises a laser light source, a first polarization control unit and a channel power detection unit, wherein the laser light source is sequentially connected with the first polarization control unit and the photoelectric modulator MZM 01, and the channel power detection unit is respectively connected with the laser light source, the photoelectric modulator MZM 01, the optical fiber amplifier EDFA and the first wave-division multiplexing unit;
the OLT plate comprises a photoelectric direct detection unit, a band-pass filter unit, a high-frequency amplification module, a low-pass filter unit, a high-pass filter unit and a microwave amplification module, wherein the photoelectric direct detection unit is sequentially connected with the band-pass filter unit and the high-frequency amplification module; the photoelectric direct detection unit is connected with the low-pass filtering unit; the photoelectric direct detection unit is sequentially connected with the high-pass filtering unit and the microwave amplifying module.
Further, the ONU plates are distinguished by ONU-1, ONU-2, ONU-15; 31 paths of laser harmonic signals are arranged in the first wavelength division multiplexing unit, one path of laser harmonic signals is connected with the channel power detection unit, and the other 30 paths of laser harmonic signals are connected with the first wavelength division multiplexing unit in a channel mode; the 30 paths of laser harmonic signals are respectively in one-to-one correspondence with the channel 1 and the channel 2.
Further, every two adjacent channels form a pair, and 15 pairs of channels are formed; each pair of channels corresponds to ONU-1, ONU-2, & ONU-15 one by one.
Further, the OLT block further includes a first baseband data unit, an optical-electrical modulator MZM 02, a high-frequency data unit, and an optical-electrical modulator MZM03, where the optical-electrical modulator MZM 02 and the optical-electrical modulator MZM03 are disposed in the channel 1, the optical-electrical modulator MZM 02 is connected with the first baseband data unit, and the optical-electrical modulator MZM03 is connected with the high-frequency data unit.
Further, the ONU patch further includes a photoelectric modulator MZM 04, a second baseband data unit, and a second polarization control unit, where the photoelectric modulator MZM 04 is connected to the second baseband data unit and the second polarization control unit, and the ONU patch returns data to the OLT patch through the photoelectric modulator MZM 04 and the second polarization control unit; the second wave-division multiplexing unit is respectively connected with the photoelectric direct detection unit and the photoelectric modulator MZM 04.
Further, the symmetry factor default configuration of the MZM 01 of the photoelectric modulator is 0.88, and the extinction ratio is 30dB; the amplification factor of the EDFA of the optical fiber amplifier is configured to be 30dB by default, and the noise coefficient is 4dB; the laser source outputs default configuration of 0dBm, the line width is 5MHz, and the initial phase is 0 degree; the 31 paths of laser harmonic signals are 20GHz; each channel is output at 10±1dBm power.
A second object of the present invention is to provide a signal processing method of an optical fiber wireless fusion communication system, the signal processing method including a near-end output and a far-end output, the near-end output including the steps of:
(1) outputting a single-tone signal by a tunable radio frequency generator, performing frequency-up processing twice, and outputting a 20GHz radio frequency signal, wherein the radio frequency signal performs electro-optic modulation on a 194.1THz laser wave output by a laser light source and controlled by bias through a photoelectric modulator MZM 01, and the modulated carrier signal performs amplification processing through an optical fiber amplifier EDFA, and then performs wave processing on 31 paths of laser harmonic signals with adjacent channel intervals of 20GHz through a first wave-division multiplexing unit;
(2) the method comprises the steps that one path of laser harmonic signals split by a first wave division multiplexing unit are subjected to power detection on the channel optical power through a channel power detection unit, then feedback control is respectively carried out on an optical fiber amplifier EDFA, a photoelectric modulator MZM 01 and a laser light source as control signals, dynamic approximation type automatic fine adjustment is respectively carried out on the power output of the laser light source, the symmetry factor of the photoelectric modulator MZM 01 and the amplification multiple of the optical fiber amplifier EDFA, and further power balance of each path of optical wave signals split by the first wave division multiplexing unit and 10+/-1 dBm power output of each channel are ensured;
(3) the other 30 paths of laser harmonics decomposed by the first wave decomposition multiplexing unit are divided into 15 pairs of channels according to adjacent channels, wherein the first pair is channel 1 and channel 2 and is used for corresponding to the ONU-1 at the far end, the second pair is channel 3 and channel 4 and is used for corresponding to the ONU-2 at the far end, and the like;
(4) the channel 1 sequentially passes through the photoelectric modulator MZM 02 and the photoelectric modulator MZM03 to be modulated by a first baseband data unit and a high frequency data unit respectively, and modulated light carrier signals and unmodulated adjacent laser harmonics are coupled into a standard single mode fiber through a first wavelength division multiplexing unit to carry out signal transmission, so that the modulated light carrier signals and unmodulated adjacent laser harmonics reach a second wavelength division multiplexing unit;
further, the remote output comprises the steps of:
(1) after receiving modulated optical carriers and laser harmonics transmitted from an OLT plate, a second wave demultiplexing unit respectively distributes 15 pairs of channels to 15 ONU plates according to the adjacent channel pairing principle in the OLT plate;
(2) taking ONU-1 as an example, a channel 1 of a modulated light carrier and a pure laser harmonic channel 2 are subjected to combination and photoelectric conversion treatment in a photoelectric direct detection unit, then power is equally divided into three paths, the first path is sequentially processed by a band-pass filter unit and a high-frequency amplification module to obtain a 2.4GHz high-frequency carrier signal, and then the signal is transmitted by an antenna to realize downlink wireless access;
(3) the second path recovers the original baseband data through the low-pass filtering unit, and realizes downlink wired access;
(4) the third path is processed by a high-pass filter unit and a microwave amplifying module in sequence to obtain a 20GHz microwave signal, and then the microwave signal is transmitted by an antenna to realize downlink microwave access.
Furthermore, a part of laser harmonic waves are separated from the channel 1 in the ONU plate before the channel 1 is combined with the channel 2 for photoelectric detection, uplink baseband data are modulated by the photoelectric modulator MZM 04, and then the uplink baseband data are transmitted back to the OLT plate through the uplink optical fiber after passing through the second polarization control unit, so that uplink communication is realized.
Further, the modulation format in channel 1 is OFDM, n-QAM, QPSK or Nyquist-DP-16QAM, and then after mixing, the frequency is increased to a high frequency signal of 2.4 GHz.
The invention has the beneficial effects that: through the modulation of the OLT plate, complex signal mixing and signal modulation processing are not needed in the ONU plate, the generation of a baseband signal source, a high-frequency signal source and a microwave signal source is directly realized, the original data modulation format of the transmitting end of the OLT plate is reserved, and a low-complexity signal source solution is provided for multi-scene communication access.
Description of the drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
fig. 1 is a block diagram of an optical fiber wireless convergence communication system according to the present invention.
Best mode for carrying out the invention
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
As shown in fig. 1, an optical fiber wireless fusion communication system for multi-scenario application comprises an OLT plate, an optical fiber, a second wavelength division multiplexing unit and a plurality of ONU plates, wherein the OLT plate is connected with the plurality of ONU plates sequentially through the optical fiber and the second wavelength division multiplexing unit, and comprises a tunable radio frequency generator, a primary frequency-up processing unit, a secondary frequency-up processing unit, a photoelectric modulator MZM 01, an optical fiber amplifier EDFA, a first wavelength division multiplexing unit and a first wavelength division multiplexing unit, and the tunable radio frequency generator is connected with the primary frequency-up processing unit, the secondary frequency-up processing unit, the photoelectric modulator MZM 01, the optical fiber amplifier EDFA, the first wavelength division multiplexing unit and the first wavelength division multiplexing unit sequentially; the OLT plate further comprises a laser light source, a first polarization control unit and a channel power detection unit, wherein the laser light source is sequentially connected with the first polarization control unit and the photoelectric modulator MZM 01, and the channel power detection unit is respectively connected with the laser light source, the photoelectric modulator MZM 01, the optical fiber amplifier EDFA and the first wave-division multiplexing unit;
the OLT plate comprises a photoelectric direct detection unit, a band-pass filter unit, a high-frequency amplification module, a low-pass filter unit, a high-pass filter unit and a microwave amplification module, wherein the photoelectric direct detection unit is sequentially connected with the band-pass filter unit and the high-frequency amplification module; the photoelectric direct detection unit is connected with the low-pass filtering unit; the photoelectric direct detection unit is sequentially connected with the high-pass filtering unit and the microwave amplifying module.
The ONU plates are distinguished by ONU-1, ONU-2, ONU-15; 31 paths of laser harmonic signals are arranged in the first wavelength division multiplexing unit, one path of laser harmonic signals is connected with the channel power detection unit, and the other 30 paths of laser harmonic signals are connected with the first wavelength division multiplexing unit in a channel mode; the 30 paths of laser harmonic signals are respectively in one-to-one correspondence with the channel 1 and the channel 2.
Every two adjacent channels form a pair, 15 pairs of channels are all arranged; each pair of channels corresponds to ONU-1, ONU-2, & ONU-15 one by one.
The OLT plate further comprises a first baseband data unit, an optoelectronic modulator MZM 02, a high-frequency data unit and an optoelectronic modulator MZM03, wherein the optoelectronic modulator MZM 02 and the optoelectronic modulator MZM03 are arranged in the channel 1, the optoelectronic modulator MZM 02 is connected with the first baseband data unit, and the optoelectronic modulator MZM03 is connected with the high-frequency data unit.
The ONU plate further comprises a photoelectric modulator MZM 04, a second baseband data unit and a second polarization control unit, wherein the photoelectric modulator MZM 04 is respectively connected with the second baseband data unit and the second polarization control unit, and the ONU plate returns data to the OLT plate through the photoelectric modulator MZM 04 and the second polarization control unit; the second wave-division multiplexing unit is respectively connected with the photoelectric direct detection unit and the photoelectric modulator MZM 04.
The symmetry factor default configuration of the MZM 01 of the photoelectric modulator is 0.88, and the extinction ratio is 30dB; the amplification factor of the EDFA of the optical fiber amplifier is configured to be 30dB by default, and the noise coefficient is 4dB; the laser source outputs default configuration of 0dBm, the line width is 5MHz, and the initial phase is 0 degree; the 31 paths of laser harmonic signals are 20GHz; each channel is output at 10±1dBm power.
A signal processing method of an optical fiber wireless fusion communication system comprises a near-end output and a far-end output.
As shown in fig. 1, the OLT blocks establish link high-speed information transmission with the N ONU blocks at the far end through a 10 km standard single-mode fiber and a second wavelength division multiplexing unit, and pure laser harmonics transmitted to the ONU blocks are used for uplink laser sources of the ONU blocks.
The proximal output comprises the steps of:
(1) the tunable radio frequency generator outputs single-tone signals (taking 5GHz as an example) with different frequency bands, and outputs 20GHz radio frequency signals after two frequency-up processing, the radio frequency signals carry out electro-optic modulation on 194.1THz laser light waves which are output by a laser light source and are subjected to bias control through a photoelectric modulator MZM 01, the modulated carrier signals carry out amplification processing through an optical fiber amplifier EDFA, and then carry out wave processing on 31 paths of laser harmonic signals with 20GHz adjacent channel spacing through a first wave decomposition multiplexing unit;
(2) the split laser harmonic signals are subjected to power detection on the channel optical power through a channel power detection unit, then are used as control signals to respectively perform feedback control on an optical fiber amplifier EDFA, a photoelectric modulator MZM 01 and a laser light source, and respectively perform dynamic approximation type automatic fine adjustment on the power output of the laser light source, the symmetry factor of the photoelectric modulator MZM 01 and the amplification multiple of the optical fiber amplifier EDFA, so that the power balance of each optical wave signal decomposed by a wave first wave decomposition multiplexing unit is ensured, and each channel is subjected to 10+/-1 dBm power output; wherein, the symmetry factor of the MZM 01 of the photoelectric modulator is default configured to be 0.88, and the extinction ratio is 30dB; the amplification factor of the EDFA of the optical fiber amplifier is configured to be 30dB by default, and the noise coefficient is 4dB; the laser source outputs default configuration of 0dBm, the line width is 5MHz, and the initial phase is 0 degree;
(3) the other 30 laser harmonics decomposed by the first wave-division multiplexing unit are divided into 15 pairs of channels according to adjacent channels, wherein the first pair (i.e. the channel 1 and the channel 2) is used for corresponding to the ONU-1 at the far end, the second pair (i.e. the channel 3 and the channel 4) is used for corresponding to the ONU-2 at the far end, and the like. Taking the first pair as an illustration, the following (the other fourteen pairs of channels processing methods are the same): channel 1 sequentially passes through the photoelectric modulator MZM 02 and the photoelectric modulator MZM03 to be modulated by a first baseband data unit and a high frequency data unit respectively (the modulation format can be OFDM, n-QAM, QPSK or Nyquist-DP-16QAM, and then the modulation format is a high frequency signal with the frequency up to 2.4GHz after mixing), and the modulated optical carrier signal and the unmodulated adjacent laser harmonic (namely channel 2) are coupled into a standard single mode fiber through a first wavelength division multiplexing unit to carry out signal transmission, and then reach a second wavelength division multiplexing unit at a far end;
the remote output comprises the steps of:
(1) after receiving the modulated optical carrier and the laser harmonic transmitted from the OLT blocks, the second wavelength division multiplexing unit distributes 15 pairs of channels to 15 ONU blocks according to the adjacent channel pairing principle in the OLT.
(2) The following is described by taking ONU-1 as an example (the other fourteen pairs of channels are processed in the same way): the channel 1 of the modulated light carrier wave and the pure laser harmonic channel 2 are subjected to combination and photoelectric conversion treatment in a photoelectric direct detection unit, then power is equally divided into three paths, the first path is sequentially processed by a band-pass filtering unit and a high-frequency amplifying module to obtain a 2.4GHz high-frequency carrier wave signal (only carrying high-frequency data modulation signal information in an OLT plate), and then the carrier wave signal is transmitted by an antenna to realize downlink wireless access;
(3) the second path recovers the original baseband data (the baseband data is the baseband data modulation signal information in the OLT plate) through the low-pass filtering unit, and realizes the downlink wired access;
(4) the third path is processed by a high-pass filtering single-opening and microwave amplifying module in sequence to obtain a 20GHz microwave signal (only carrying the baseband data modulation signal information in the OLT plate), and then the microwave signal is transmitted by an antenna to realize downlink microwave access.
As shown in fig. 1, a part of laser harmonic wave is separated before the channel 2 in the ONU plate is combined with the channel 1 for photoelectric detection, uplink baseband data is modulated by the photoelectric modulator MZM 04, and then the uplink baseband data is transmitted back to the OLT plate through the uplink optical fiber after passing through the second polarization control unit, so that uplink communication is realized. According to the scheme, one uplink optical module is saved in each ONU plate, so that the overall cost of a plurality of ONU plates is greatly reduced, meanwhile, the complexity of the ONU plates is simplified, and the maintenance cost of the later active optical module in the ONU plates is further reduced.
It should be noted that:
(1) The modulated light carrier wave and adjacent channel pure laser harmonic wave are combined in an ONU plate, and the photoelectric conversion treatment can generate a 20GHz carrier wave signal; the modulated carrier wave can also be combined with the pure laser harmonic wave of the non-adjacent channel in the ONU plate, and the photoelectric conversion processing generates a 20 x N (GHz) carrier wave signal for microwave wireless communication (N refers to the absolute value of the difference between the channel of the modulated carrier wave and the channel of the combined non-adjacent laser harmonic wave); the output frequency of the tunable radio frequency generator is adjusted, so that the laser harmonic interval is changed, namely, 20GHz is adjusted to other needed frequency bands, the corresponding channel interval of wavelength division multiplexing and wavelength division multiplexing is adjusted, and then the frequency band of microwave access of an ONU end is changed, so that the microwave frequency band wanted by us is obtained.
(2) In an OLT plate, by improving the structure of two 3dB couplers in an MZM 01 device of the photoelectric modulator, the symmetry factor of the photoelectric modulator is fixed on a value of 0.88, and a laser light source generates a series of laser harmonics with balanced power and synchronous phase after being modulated by radio frequency signals through the MZM 04 of the photoelectric modulator. The first wave-division multiplexing unit is used for carrying out power detection on one of the separated channel laser harmonic waves, and then the power detection is fed to the optical fiber amplifier EDFA and the photoelectric modulator MZM 01 for carrying out parameter dynamic monitoring.
(3) In the ONU plate, complex signal mixing and signal modulation processing are not needed, the generation of a baseband signal source, a high-frequency signal source and a microwave signal source is directly realized, the original data modulation format of the sending end of the OLT plate is reserved, and a low-complexity signal source solution is provided for multi-scene communication access.
The above embodiments are merely for fully disclosing the present invention, but not limiting the present invention, and should be considered as the scope of the disclosure of the present application based on the substitution of equivalent technical features of the inventive subject matter without creative work.
Claims (8)
1. An optical fiber wireless fusion communication system for multi-scene application comprises an OLT plate, an optical fiber, a second wavelength-division-decomposition multiplexing unit and a plurality of ONU plates, wherein the OLT plate is connected with the plurality of ONU plates through the optical fiber and the second wavelength-division-decomposition multiplexing unit in sequence,
the OLT plate comprises a tunable radio frequency generator, a primary frequency-up processing unit, a secondary frequency-up processing unit, an optical modulator MZM 01, an optical fiber amplifier EDFA, a first wavelength division multiplexing unit and a first wavelength division multiplexing unit, wherein the tunable radio frequency generator is sequentially connected with the primary frequency-up processing unit, the secondary frequency-up processing unit, the optical fiber modulator MZM 01, the optical fiber amplifier EDFA, the first wavelength division multiplexing unit and the first wavelength division multiplexing unit; the OLT plate further comprises a laser light source, a first polarization control unit and a channel power detection unit, wherein the laser light source is sequentially connected with the first polarization control unit and the photoelectric modulator MZM 01, and the channel power detection unit is respectively connected with the laser light source, the photoelectric modulator MZM 01, the optical fiber amplifier EDFA and the first wave-division multiplexing unit;
the ONU plate comprises a photoelectric direct detection unit, a band-pass filter unit, a high-frequency amplification module, a low-pass filter unit, a high-pass filter unit and a microwave amplification module, wherein the photoelectric direct detection unit is sequentially connected with the band-pass filter unit and the high-frequency amplification module; the photoelectric direct detection unit is connected with the low-pass filtering unit; the photoelectric direct detection unit is sequentially connected with the high-pass filtering unit and the microwave amplifying module;
the OLT plate further comprises a first baseband data unit, an optoelectronic modulator MZM 02, a high-frequency data unit and an optoelectronic modulator MZM03, wherein the optoelectronic modulator MZM 02 and the optoelectronic modulator MZM03 are arranged in the channel 1, the optoelectronic modulator MZM 02 is connected with the first baseband data unit, and the optoelectronic modulator MZM03 is connected with the high-frequency data unit; the ONU plate further comprises a photoelectric modulator MZM 04, a second baseband data unit and a second polarization control unit, wherein the photoelectric modulator MZM 04 is respectively connected with the second baseband data unit and the second polarization control unit, and the ONU plate returns data to the OLT plate through the photoelectric modulator MZM 04 and the second polarization control unit; the second wave-division multiplexing unit is respectively connected with the photoelectric direct detection unit and the photoelectric modulator MZM 04.
2. The wireless convergence of fiber communication system as recited in claim 1, wherein said plurality of ONU-blocks are differentiated by ONU-1, ONU-2, & ONU-15; 31 paths of laser harmonic signals are arranged in the first wavelength division multiplexing unit, one path of laser harmonic signals is connected with the channel power detection unit, and the other 30 paths of laser harmonic signals are connected with the first wavelength division multiplexing unit in a channel mode; the 30 paths of laser harmonic signals are respectively in one-to-one correspondence with the channel 1 and the channel 2.
3. The wireless convergence of fiber communication system as set forth in claim 2, wherein each two adjacent channels form a pair of 15 pairs of channels; each pair of channels corresponds to ONU-1, ONU-2, & ONU-15 one by one.
4. The wireless convergence of fiber communication system as set forth in claim 2, wherein the symmetry factor of the opto-electric modulator MZM 01 is default configured to 0.88 with a extinction ratio of 30dB; the amplification factor of the EDFA of the optical fiber amplifier is configured to be 30dB by default, and the noise coefficient is 4dB; the laser source outputs default configuration of 0dBm, the line width is 5MHz, and the initial phase is 0 degree; the 31 paths of laser harmonic signals are 20GHz; each channel is output at 10±1dBm power.
5. A signal processing method of a wireless converged communication system of any one of claims 1 to 4, wherein the signal processing method includes a near-end output and a far-end output, the near-end output including the steps of:
(1) outputting a single-tone signal by a tunable radio frequency generator, performing frequency-up processing twice, and outputting a 20GHz radio frequency signal, wherein the radio frequency signal performs electro-optic modulation on a 194.1THz laser wave output by a laser light source and controlled by bias through a photoelectric modulator MZM 01, and the modulated carrier signal performs amplification processing through an optical fiber amplifier EDFA, and then performs wave processing on 31 paths of laser harmonic signals with adjacent channel intervals of 20GHz through a first wave-division multiplexing unit;
(2) the method comprises the steps that one path of laser harmonic signals split by a first wave division multiplexing unit are subjected to power detection on the channel optical power through a channel power detection unit, then feedback control is respectively carried out on an optical fiber amplifier EDFA, a photoelectric modulator MZM 01 and a laser light source as control signals, dynamic approximation type automatic fine adjustment is respectively carried out on the power output of the laser light source, the symmetry factor of the photoelectric modulator MZM 01 and the amplification multiple of the optical fiber amplifier EDFA, and further power balance of each path of optical wave signals split by the first wave division multiplexing unit and 10+/-1 dBm power output of each channel are ensured;
(3) the other 30 paths of laser harmonics decomposed by the first wave decomposition multiplexing unit are divided into 15 pairs of channels according to adjacent channels, wherein the first pair is channel 1 and channel 2 and is used for corresponding to the ONU-1 at the far end, the second pair is channel 3 and channel 4 and is used for corresponding to the ONU-2 at the far end, and the like;
(4) the channel 1 sequentially passes through the photoelectric modulator MZM 02 and the photoelectric modulator MZM03 to be modulated by a first baseband data unit and a high frequency data unit respectively, and the modulated optical carrier signal and unmodulated adjacent laser harmonic waves are coupled into a standard single mode fiber through a first wavelength division multiplexing unit to be transmitted, so that the modulated optical carrier signal and the unmodulated adjacent laser harmonic waves reach a second wavelength division multiplexing unit.
6. The signal processing method of claim 5, wherein the remote output comprises the steps of:
(1) after receiving modulated optical carriers and laser harmonics transmitted from an OLT plate, a second wave demultiplexing unit respectively distributes 15 pairs of channels to 15 ONU plates according to the adjacent channel pairing principle in the OLT plate;
(2) taking ONU-1 as an example, a channel 1 of a modulated light carrier and a pure laser harmonic channel 2 are subjected to combination and photoelectric conversion treatment in a photoelectric direct detection unit, then power is equally divided into three paths, the first path is sequentially processed by a band-pass filter unit and a high-frequency amplification module to obtain a 2.4GHz high-frequency carrier signal, and then the signal is transmitted by an antenna to realize downlink wireless access;
(3) the second path recovers the original baseband data through the low-pass filtering unit, and realizes downlink wired access;
(4) the third path is processed by a high-pass filter unit and a microwave amplifying module in sequence to obtain a 20GHz microwave signal, and then the microwave signal is transmitted by an antenna to realize downlink microwave access.
7. The signal processing method of claim 6, wherein a part of laser harmonics are separated from the channel 1 in the ONU block before combining with the channel 2 for photoelectric detection, and uplink baseband data is modulated by the photoelectric modulator MZM 04, and then returned to the OLT block through an uplink optical fiber after passing through the second polarization control unit, so as to realize uplink communication.
8. The signal processing method of claim 7, wherein the modulation format in the channel 1 is OFDM, nQAM, QPSK or Nyquist-DP-16QAM, and then after mixing, the high frequency signal is up-converted to 2.4 GHz.
Priority Applications (1)
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