CN105827318B - A kind of WDM passive optical network system and method generating mixing transmission signal - Google Patents
A kind of WDM passive optical network system and method generating mixing transmission signal Download PDFInfo
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- CN105827318B CN105827318B CN201610313446.9A CN201610313446A CN105827318B CN 105827318 B CN105827318 B CN 105827318B CN 201610313446 A CN201610313446 A CN 201610313446A CN 105827318 B CN105827318 B CN 105827318B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
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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
-
- 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
- H04B10/27—Arrangements for networking
-
- 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
-
- 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
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
-
- 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
- H04B10/564—Power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
- H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
-
- 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
Abstract
The invention discloses a kind of WDM passive optical network systems for generating mixing transmission signal, including Base Band Unit, optical line terminal, optical fiber branch device, several optical network units and several remote radio unit (RRU)s；The center baseband unit and optical line terminal connection, the optical fiber branch device is connected between the optical line terminal and the optical network unit, the optical network unit is connect with the remote radio unit (RRU)；The optical line terminal includes the laser source for generating continuous light carrier；For generating 4 road 10-Gb/s and 1 road 100-Gb/s signal and the independent sideband signals generation module for carrying out independent sideband modulation；For carrying out the bandwidth power amplifier of power amplification to signal；Light I/Q modulator for mixing electric signal to be modulated on the light carrier that the light source generates and is transmitted in coupled into optical fibres link.The independent sideband modulation energy 100% of this system improves bandwidth availability ratio using the effective bandwidth of system transmission end photoelectric device.
Description
Technical field
The present invention relates to technical field of optical fiber communication, more particularly to it is a kind of applied to the mobile forward pass of mixed type, can
The wavelength division multiplexing type passive optical network of mixed type 10-Gb/s and 100-Gb/s channel is provided simultaneously and generates mixed transport letter
Number method.
Background technique
As Intemet data traffic, digital TV in high resolution and the explosive growth of cloud computing, mobile communication volume are rapid
Increase, therefore improve message capacity problem to become very urgent.The currently used scheme based on mobile retransmission starts to show
The weak phenomenon of rate not enough fast, bandwidth capacity deficiency etc., this makes mobile forward pass scheme show research and practical value.It is existing
The common approach that some improves mobile communication system capacity has: (1) mobile retransmission scheme: such as increase interface bandwidth and base station number
Amount, but a large amount of base station investment leads to high energy consumption, and additional investment cost of operators and operation cost increase year by year；(2) mobile forward pass side
Case.The Radio Access Network of the mobile forward pass of mixed type is considered as the side that another effectively improves mobile communication system capacity
Case, but with existing mobile demand growth speed from the point of view of, the single-channel rate requirement of passive optical network will be more than 10-Gb/s, very
It is up to the 100-Gb/s of newest commercial standard (CS) in more situations, or even 10-Gb/s and 100-Gb/s channel will occur while mix
Applicable cases.In recent years, light Nyquist (Nyquist) technology is considered as realizing the most effective way of system high-frequency spectrum efficiency
Diameter.Its principle is the method that sub-channel carries out light spectrum reshaping or electrical domain digital filtering, does not overlap the frequency spectrum of adjacent channel,
And approach channel width, reach (signal spectrum is square) and be even more than the Nyquist limit, realize the noiseless biography of interchannel
It is defeated.In order to further increase bandwidth availability ratio, by wavelength division multiplexing type passive optical network in conjunction with multiple subcarrier multiplexings, example
Such as in conjunction with orthogonal frequency division multiplexi (OFDM) and Nyquist wavelength-division multiplex (Nyquist-WDM) technology.However, present
Light carrier modulation technique mostly uses greatly double sideband modulation, and (modulated signal includes the signal message of upper frequency band and the information mirror of lower frequency band
Picture) or single sideband modulation, this modulation technique can not make full use of effective band of system transmission end device and continuous light carrier
Width, band efficiency only have 50%, and the raising of its bandwidth availability ratio is caused to be limited.And utilize upper and lower band modulation independent
The independent sideband modulation technology that signal, band efficiency reach 100% then shows huge advantage.Especially with relevant detection
Mixed type 10G/100G multichannel, only need a light source, a light I/Q modulator and an optical line terminal, can be simultaneously
4 road 10-Gb/s and 1 road 100-Gb/s channel are generated, band efficiency improves bandwidth availability ratio, reduced system up to 100%
Cost.
Summary of the invention
In order to overcome the shortcomings of that the cost of existing bandwidth efficiency modulation mode and the problem of bandwidth availability ratio, the present invention are public
Opened it is a kind of applied to the mobile forward pass of mixed type and meanwhile the wavelength-division multiplex of mixed type 10-Gb/s and 100-Gb/s channel is provided
Type passive optical network carries out high efficiency bandwidth modulation to light carrier, and system is whole by using nyquist frequency multiplexing technology
It closes independent sideband modulation format and high efficiency bandwidth modulation is carried out to light carrier.Using an optical transmitter, while generating 4 tunnels of mixing
The downstream transmission signals of 10-Gb/s and 1 road 100-Gb/s.This technology only need an arbitrary source, a light I/Q modulator and
One optical line terminal can generate the upper side band for carrying individual transmission information and lower sideband to improve bandwidth availability ratio.
Mobile forward pass concept is the hair of the formulation and base station radio-frequency equipment of new generation with general common radio-frequency interface CPRI
Spread is proposed at distributed base station.The function of original base station is divided into a centrally located Base Band Unit by this base station
BBU and several remote radio unit (RRU)s RRH.Such a Base Band Unit corresponds to multiple remote radio unit (RRU)s, can solve very well
The covering of large stadium；It is also beneficial to reduce the quantity of base station, can be effectively reduced cost and improves message capacity.
The technical solution adopted by the present invention to solve the technical problems is:
It is a kind of generate mixing transmission signal WDM passive optical network system, including Base Band Unit, optical line terminal,
Optical fiber branch device, several optical network units and several remote radio unit (RRU)s；The center baseband unit and the optical link
Terminal connects, the optical fiber branch device is connected between the optical line terminal and the optical network unit, the optical-fiber network list
It is first to be connect with the remote radio unit (RRU), specifically, the optical line terminal includes:
One light source, for generating continuous light carrier；
Independent sideband signals generation module, for generating 4 road 10-Gb/s and 1 road 100-Gb/s signal；To the 4 road 10-
Gb/s and 1 road 100-Gb/s signal carry out independent sideband modulation and generate the road I and the road Q signal；
First bandwidth power amplifier, for receiving the road the I signal of independent sideband signals generation module output and carrying out function
Rate amplification；
Second bandwidth power amplifier, for receiving the road the Q signal of independent sideband signals generation module output and carrying out function
Rate amplification；
One smooth I/Q modulator, it is defeated for receiving the first bandwidth power amplifier and the second bandwidth power amplifier
Signal out, electric signal will be mixed by, which realizing, is modulated on the light carrier that the light source generates and transmits in coupled into optical fibres link.
Further, the independent sideband signals generation module includes:
Digital signal generation module generates 4 road 10- using Field Programmable Logic Array control high-speed A/D converter
Gb/s digital signal and 1 road 100-Gb/s digital signal；
Independent sideband modulation module, the 4 road 10-Gb/s digital signals generated for receiving the digital signal generation module
With 1 road 100-Gb/s digital signal；To the 4 road 10-Gb/s digital signal carry out respectively the mapping of independent PM-QPSK data, how
Qwest filters and downconverts to lower sideband；The mapping of 16-QAM data, Nai Kuisi are carried out to the 1 road 100-Gb/s digital signal
Spy's filtering and up-conversion to upper side band；Realize the upper side band and the road lower sideband 4+1 plural number mixed signal for carrying individual transmission information；
Pre-equalization process module, the road the 4+1 plural number mixed signal generated for receiving the independent sideband modulation module, and
The distortion of high frequency section before transmission is pre-compensated for.
Specifically, including Optical Distribution Network, the optical distribution network between the optical line terminal and the optical network unit
Network includes:
Fiber amplifier, for receiving the signal of the smooth I/Q modulator output transmitted in optical fiber link, and to institute
It states signal and realizes amplification；
Standard single-mode fiber for receiving the signal of the fiber amplifier output, and carries out certain distance biography to signal
It is defeated, transmission signal output is realized in terminal；
Optical fiber branch device for receiving the transmission signal of the standard single-mode fiber output, and arrives transmission signal branch
Several optical network units.
Specifically, the optical network unit includes:
Tunable optical filter for receiving the signal light of the optical fiber branch device output, and carries out wave to the signal light
Long selection and demultiplexing process；
Integrated coherent optical heterodyne communicatio, for receiving the signal light of the tunable optical filter, and by local oscillator light and it is described can
The signal light of light modulation filter is mixed using frequency mixer, and signal is down-converted to micro- carrier frequency from light carrier frequency；It is examined using photoelectric detector
Measured center frequency carries out demodulation backoff algorithm to micro- carrier frequency, exports baseband signal；
Analog-to-digital conversion and signal processing module, for receiving the baseband signal of the integrated coherent optical heterodyne communicatio output, and
Analog-to-digital conversion is carried out to the baseband signal；The baseband signal is carried out at sampling and dispersion compensation using digital processing method
Reason；It is multiplexed using constant modulus algorithm depolarization；Phase recovery is carried out using least mean square algorithm.
A method of mixing transmission signal being generated, based on above-mentioned optical line terminal, method includes:
One light source generates continuous light carrier；
Independent sideband signals generation module generates 4 road 10-Gb/s and 1 road 100-Gb/s signal, to the 4 road 10-Gb/s
Independent sideband modulation is carried out with 1 road 100-Gb/s signal and generates the road I and the road Q signal；
First bandwidth power amplifier receives the road the I signal of independent sideband signals generation module output and carries out power and puts
Greatly；
Second bandwidth power amplifier receives the road the Q signal of independent sideband signals generation module output and carries out power and puts
Greatly；
Light I/Q modulator receives the letter of the first bandwidth power amplifier and the second bandwidth power amplifier output
Number, electric signal will be mixed by, which realizing, is modulated on the light carrier that the light source generates and transmits in coupled into optical fibres link.
Further, the independent sideband signals generation module generates 4 road 10-Gb/s and 1 road 100-Gb/s signal, to institute
It states 4 road 10-Gb/s and 1 road 100-Gb/s signal carries out independent sideband modulation and generates the road I and the road Q signal, comprising:
Field Programmable Logic Array and high-speed A/D converter form signal source, using field alterable at logic array control
High-speed A/D converter processed generates 4 road 10-Gb/s digital signals and 1 road 100-Gb/s digital signal；
To 4 road 10-Gb/s digital signals of generation carry out respectively the mapping of independent PM-QPSK data, nyquist filtering and
Downconvert to lower sideband；To 1 road 100-Gb/s digital signal of generation carry out the mapping of 16-QAM data, nyquist filtering and on
It is converted to upper side band；Realize the upper side band and the road lower sideband 4+1 plural number mixed signal for carrying individual transmission information；
For the frequency response unevenness phenomenon of photoelectric device, the road the 4+1 plural number mixed signal of generation is carried out pre- equal
Weighing apparatus processing, pre-compensates for for its distortion of high frequency section before transmission.
Further, the spectral shape of the 4+1 plural number mixed signal subchannel is rectangular.
Further, the protection interval between the subchannel is set as 0.1GHz.
The beneficial effects of the present invention are: cost can be effectively reduced and improve bandwidth availability ratio.
Invention is further described in detail with reference to the accompanying drawings and embodiments, but a kind of generation of the invention is mixed and passed
The WDM passive optical network system and method for defeated signal are not limited to the embodiment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the mobile forward pass passive optical network of wavelength-division multiplex provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of optical line terminal provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of independent sideband signals generation module on optical line terminal provided in an embodiment of the present invention；
Fig. 4 is the spectrogram of modulated signal provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of Optical Distribution Network provided in an embodiment of the present invention；
Fig. 6 is the structural schematic diagram of optical network unit provided in an embodiment of the present invention；
Fig. 7 is the connection schematic diagram of optical line terminal provided in an embodiment of the present invention, Optical Distribution Network and optical network unit.
In figure:
1, Base Band Unit, 2, optical line terminal, 3, optical fiber branch device, 4, optical network unit, 5, remote radio unit (RRU), 6, swash
Light source, 7, I/Q modulator, 8, independent sideband signals generation module, the 91, first bandwidth power amplifier, the 92, second bandwidth power
Amplifier, 10, the plural number road I signal, 1010, the plural number road Q signal, 11, mixed signal output, 12, digital signal generation module,
13, PM-QPSK data map, 14, the mapping of 16-QAM data, 15, fiber amplifier, 16, standard single-mode fiber, 17, propagation letter
Number output, 18, Optical Distribution Network, 19, tunable optical filter, 20, integrated coherent optical heterodyne communicatio, at 21, analog-to-digital conversion and signal
Manage module, 22, Nyquist filtering and down-converted, 23, Nyquist filtering and upconversion process, 24, pre-equalization process mould
Block.
Specific embodiment
Fig. 1 is the structural schematic diagram of the mobile forward pass passive optical network of wavelength-division multiplex based on mobile forward pass, the system
Be made of a centrally located Base Band Unit 1 and several remote radio unit (RRU)s 5, using an optical fiber branch device 3 by
For the signal branch that Base Band Unit 1 and optical line terminal 2 transmit to several optical network units 4, remote radio unit (RRU) 5 can be to letter
It number amplifies or Up/Down Conversion.
Fig. 2 is the mixing 4 for integrating independent sideband modulation format on optical line terminal based on nyquist frequency multiplexing technology
The signal modulation schematic diagram of road 10-Gb/s and 1 road 100-Gb/s, including laser source 6, light I/Q modulator 7, independent sideband signals are raw
At module 8 and the first bandwidth power amplifier 91, the second bandwidth power amplifier 92 is specific:
Laser source 6, main function are for generating continuous light carrier.
Light I/Q modulator 7, main function are will to mix electric signal to be modulated on light carrier, so as to realize mixing electricity
Signal transmits in optical fiber link.
Independent sideband signals generation module 8, the structural schematic diagram of independent sideband signals generation module is as shown in figure 3, include
Digital signal generation module 12, independent sideband modulation module and pre-equalization process module 24, specific:
Digital signal generation module 12, by field alterable at logic array (FPGA) and high-speed A/D converter (DAC) group
At signal source, realize that 5 railway digital signals generate (i.e. 4 road 10-Gb/s and 1 road 100-Gb/s letter respectively using FPGA control DAC
Number).
Independent sideband modulation module carries out independent sideband modulation, 4 road 10- to 4 road 10-Gb/s and 1 road 100-Gb/s signal
Gb/s digital signal carries out independent PM-QPSK data mapping 13, Nyquist (Nyquist) filtering and down coversion 22 under respectively
Sideband (the N as shown in Fig. 4 (a)1-N4Position)；1 road 100-Gb/s digital signal carries out 16-QAM data and maps 14, Nai Kuisi
Special (Nyquist) filtering and up-conversion 23 to the upper side band (P in such as Fig. 4 (b)1).Individual transmission information is carried to realize
Upper side band and plural (IQ) mixed signal of lower sideband 4+1.The spectral shape of 4+1 independent sideband subchannel is rectangular, is signal
The maximum way of realization of the availability of frequency spectrum, the protection interval between subchannel are set as 0.1GHz.Wherein, Fig. 4 (a) is independent 4
Road 10-Gb/s PM-QPSK spectrogram；Fig. 4 (b) is independent 1 road 100-Gb/s 16QAM spectrogram；Fig. 4 (c) is that mixing is independent
Sideband (mixing 4 road 10-Gb/s and 1 road 100-Gb/s) spectrogram.
Pre-equalization process module 24 carries out at preequalization signal for the frequency response unevenness phenomenon of photoelectric device
Reason pre-compensates for for its distortion of high frequency section before transmission, obtains the plural road I, Q signal (10&1010), and 10 indicate I
Road signal, 1010 indicate the road Q signal.
First bandwidth power amplifier 91, main function are to realize power amplification to the obtained road I signal.
Second bandwidth power amplifier 92, main function are to realize power amplification to the obtained road Q signal.
The 11 coupled into optical fibres link transmission of mixed signal that light I/Q modulator 7 exports.
Fig. 5 is the structural schematic diagram of Optical Distribution Network 18, including fiber amplifier 15, standard single-mode fiber 16 and optical fiber point
Prop 3, specific:
Fiber amplifier 15, for realizing amplification to the signal in propagation.
Standard single-mode fiber 16 realizes transmission signal output 17 in terminal for carrying out certain distance transmission to signal.
Optical fiber branch device for receiving the transmission signal of the standard single-mode fiber output, and arrives transmission signal branch
Several optical network units 4.
Fig. 6 is the structural schematic diagram of optical network unit, including tunable optical filter 19, integrated coherent optical heterodyne communicatio 20 and mould
Number conversion and signal processing module 21, specific:
Tunable optical filter 19, for carrying out wavelength selection, demultiplexing process to signal light.
Integrated coherent optical heterodyne communicatio 20, for local oscillator light to be mixed with the signal light received by optical mixer unit, signal
It is down-converted to micro- carrier frequency from light carrier frequency, then passes through photoelectric detector inspection center frequency, then carries out demodulation compensation to it and calculates
Method, so that it may obtain baseband signal output.
Analog-to-digital conversion and signal processing 21 recycle at number for the signal after relevant detection to be carried out analog-to-digital conversion
Reason method to signal carry out sampling and dispersion compensation handle, using constant modulus algorithm depolarization be multiplexed, using least mean square algorithm into
Row phase recovery.
Further, as shown in fig. 7, the Optical Distribution Network 18 is connected to the optical line terminal 2 and the optical-fiber network
Between unit 4.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of WDM passive optical network system for generating mixing transmission signal, including Base Band Unit, optical line terminal, light
Fiber branching device, several optical network units and several remote radio unit (RRU)s；The Base Band Unit and the optical line terminal connect
It connects, the optical fiber branch device is connected between the optical line terminal and the optical network unit, the optical network unit and institute
State remote radio unit (RRU) connection, which is characterized in that the optical line terminal includes:
One light source, for generating continuous light carrier；
Independent sideband signals generation module, for generating 4 road 10-Gb/s and 1 road 100-Gb/s signal；To the 4 road 10-Gb/s
Independent sideband modulation is carried out with 1 road 100-Gb/s signal and generates the road I and the road Q signal；
First bandwidth power amplifier is put for receiving the road the I signal of independent sideband signals generation module output and carrying out power
Greatly；
Second bandwidth power amplifier is put for receiving the road the Q signal of independent sideband signals generation module output and carrying out power
Greatly；
One smooth I/Q modulator, for receive the first bandwidth power amplifier and the second bandwidth power amplifier output
Signal, electric signal will be mixed by, which realizing, is modulated on the light carrier that the light source generates and transmits in coupled into optical fibres link；
The optical network unit includes:
Tunable optical filter for receiving the signal light of the optical fiber branch device output, and carries out wavelength choosing to the signal light
It selects and demultiplexing process；
Integrated coherent optical heterodyne communicatio, for receiving the signal light of the tunable optical filter, and by local oscillator light and the tunable optical
The signal light of filter is mixed using frequency mixer, and signal is down-converted to micro- carrier frequency from light carrier frequency；In being detected using photoelectric detector
Frequency of heart carries out demodulation backoff algorithm to micro- carrier frequency, exports baseband signal；
Analog-to-digital conversion and signal processing module, for receiving the baseband signal of the integrated coherent optical heterodyne communicatio output, and to institute
It states baseband signal and carries out analog-to-digital conversion；Sampling is carried out to the baseband signal using digital processing method and dispersion compensation is handled；
It is multiplexed using constant modulus algorithm depolarization；Phase recovery is carried out using least mean square algorithm；
It include Optical Distribution Network between the optical line terminal and the optical network unit, the Optical Distribution Network includes:
Fiber amplifier, for receiving the signal of the smooth I/Q modulator output transmitted in optical fiber link, and to the letter
Number realize amplification；
Standard single-mode fiber for receiving the signal of the fiber amplifier output, and carries out certain distance transmission to signal,
Terminal realizes transmission signal output；
Optical fiber branch device, for receiving the transmission signal of standard single-mode fiber output, and transmission signal branch to several
A optical network unit.
2. the WDM passive optical network system according to claim 1 for generating mixing transmission signal, which is characterized in that
The independent sideband signals generation module includes:
Digital signal generation module generates 4 road 10-Gb/s numbers using Field Programmable Logic Array control high-speed A/D converter
Word signal and 1 road 100-Gb/s digital signal；
Independent sideband modulation module, the 4 road 10-Gb/s digital signals and 1 generated for receiving the digital signal generation module
Road 100-Gb/s digital signal；Independent PM-QPSK data mapping, Nai Kuisi are carried out respectively to the 4 road 10-Gb/s digital signal
Spy filters and downconverts to lower sideband；The mapping of 16-QAM data, Nyquist filter are carried out to the 1 road 100-Gb/s digital signal
Wave and up-conversion are to upper side band；Realize the upper side band and the road lower sideband 4+1 plural number mixed signal for carrying individual transmission information；
Pre-equalization process module, the road the 4+1 plural number mixed signal generated for receiving the independent sideband modulation module, and to letter
The distortion of high frequency section pre-compensates for before road transmits.
3. a kind of generation based on the WDM passive optical network system described in claim 1 for generating mixing transmission signal is mixed
The method for closing transmission signal, which is characterized in that method includes:
Light source generates continuous light carrier；
Independent sideband signals generation module generates 4 road 10-Gb/s and 1 road 100-Gb/s signal, to the 4 road 10-Gb/s and 1 tunnel
100-Gb/s signal carries out independent sideband modulation and generates the road I and the road Q signal；
First bandwidth power amplifier receives the road the I signal of independent sideband signals generation module output and carries out power amplification；
Second bandwidth power amplifier receives the road the Q signal of independent sideband signals generation module output and carries out power amplification；
Light I/Q modulator receives the signal of the first bandwidth power amplifier and the second bandwidth power amplifier output, real
Electric signal will be now mixed to be modulated on the light carrier that the light source generates and transmit in coupled into optical fibres link.
4. the method according to claim 3 for generating mixing transmission signal, which is characterized in that the independent sideband signals are raw
4 road 10-Gb/s and 1 road 100-Gb/s signal are generated at module, the 4 road 10-Gb/s and 1 road 100-Gb/s signal are carried out solely
Vertical sideband modulation simultaneously generates the road I and the road Q signal, comprising:
Field Programmable Logic Array and high-speed A/D converter form signal source, control height at logic array using field alterable
Fast digital analog converter generates 4 road 10-Gb/s digital signals and 1 road 100-Gb/s digital signal；
Independent PM-QPSK data mapping, nyquist filtering and lower change are carried out respectively to 4 road 10-Gb/s digital signals of generation
Frequently to lower sideband；The mapping of 16-QAM data, nyquist filtering and up-conversion are carried out to 1 road 100-Gb/s digital signal of generation
To upper side band；Realize the upper side band and the road lower sideband 4+1 plural number mixed signal for carrying individual transmission information；
For the frequency response unevenness phenomenon of photoelectric device, pre-equalization process is carried out to the road the 4+1 plural number mixed signal of generation,
For it, the distortion of high frequency section is pre-compensated for before transmission.
5. the method according to claim 4 for generating mixing transmission signal, it is characterised in that:
The spectral shape of the road the 4+1 plural number mixed signal subchannel is rectangular.
6. the method according to claim 5 for generating mixing transmission signal, it is characterised in that:
Protection interval between the subchannel is set as 0.1GHz.
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| CN102820945A (en) * | 2012-08-24 | 2012-12-12 | 武汉邮电科学研究院 | Passive optical network system based on Nyquist wavelength division multiplexing and realization method |
| US8983297B2 (en) * | 2011-06-10 | 2015-03-17 | Zte (Usa) Inc. | Multi-stage optical interleaving |
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| US8983297B2 (en) * | 2011-06-10 | 2015-03-17 | Zte (Usa) Inc. | Multi-stage optical interleaving |
| CN102820945A (en) * | 2012-08-24 | 2012-12-12 | 武汉邮电科学研究院 | Passive optical network system based on Nyquist wavelength division multiplexing and realization method |
| CN104604161A (en) * | 2012-08-24 | 2015-05-06 | 中兴通讯(美国)公司 | System and method for 400G signal generation and coherent detection |
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