CN205725760U - A kind of WDM passive optical network system producing mixing transmission signal - Google Patents
A kind of WDM passive optical network system producing mixing transmission signal Download PDFInfo
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- CN205725760U CN205725760U CN201620429387.7U CN201620429387U CN205725760U CN 205725760 U CN205725760 U CN 205725760U CN 201620429387 U CN201620429387 U CN 201620429387U CN 205725760 U CN205725760 U CN 205725760U
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Abstract
The utility model discloses a kind of WDM passive optical network system producing 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；Described Base Band Unit is connected with described optical line terminal, described optical fiber branch device is connected between described optical line terminal and described optical network unit, described optical network unit is connected with described remote radio unit (RRU)；Described optical line terminal includes the lasing light emitter for producing continuous light carrier wave；For producing 4 tunnel 10 Gb/s and 1 tunnel 100 Gb/s signal and carrying out the independent sideband signals generation module of independent sideband modulation；For signal being carried out the bandwidth power amplifier of power amplification；For the mixing signal of telecommunication being modulated on the light carrier that described light source produces and the light I/Q modulator of transmission in coupled into optical fibres link.The independent sideband modulation energy 100% of native system utilizes the effective bandwidth of system transmission end photoelectric device, improves bandwidth availability ratio.
Description
Technical field
This utility model relates to technical field of optical fiber communication, particularly relates to a kind of be applied to wavelength division multiplexing type passive optical network that mixed type moves forward pass, that can simultaneously provide mixed type 10-Gb/s and 100-Gb/s channel.
Background technology
Along with the explosive growth of Intemet data traffic, digital TV in high resolution and cloud computing, mobile communication volume increases rapidly, therefore improves message capacity problem and becomes very urgent.The scheme based on mobile retransmission used at present starts to demonstrate the weak phenomenons such as speed is fast not, bandwidth capacity is not enough, and this makes mobile forward pass scheme show research and practical value.The common approach of existing raising mobile communication system capacity has: (1) mobile retransmission scheme: such as increase interface bandwidth and base station number, but substantial amounts of base station puts into and causes high energy consumption, additional investment cost of operators and operation cost to increase year by year；(2) forward pass scheme is moved.It is considered as that another is effectively improved the scheme of mobile communication system capacity that mixed type moves the Radio Access Network of forward pass, but from the point of view of existing mobile demand growth speed, the single-channel rate requirement of EPON will be more than 10-Gb/s, it is up to the 100-Gb/s of up-to-date commercial standard (CS) in the case of a lot, even will appear from 10-Gb/s and 100-Gb/s channel and mix applicable cases simultaneously.In recent years, light Nyquist (Nyquist) technology is considered as the most effective approach realizing system high-frequency spectrum efficiency.Its principle is that sub-channel carries out light spectrum reshaping or the method for electrical domain digital filtering, make the frequency spectrum non-overlapping copies of adjacent channel, and make that channel width is close, reach (signal spectrum is square) the even more than Nyquist limit, it is achieved transmission that interchannel is noiseless.In order to improve bandwidth availability ratio further, wavelength division multiplexing type EPON is combined with multiple subcarrier multiplexings, such as, is combined with orthogonal frequency division multiplexi (OFDM) and Nyquist wavelength-division multiplex (Nyquist-WDM) technology.But, present light carrier modulation technique uses double sideband modulation (signal message that modulated signal comprises frequency band and the information mirror image of lower frequency band) or single sideband modulation mostly, this modulation technique can not make full use of system transmission end device and the effective bandwidth of continuous light carrier wave, its band efficiency only has 50%, and the raising causing its bandwidth availability ratio is limited.The independent sideband modulation technology utilizing upper and lower band modulation independent signal, band efficiency to reach 100% then shows huge advantage.Mixed type 10G/100G multichannel especially with relevant detection, only needing a light source, a light I/Q modulator and an optical line terminal, just can produce 4 road 10-Gb/s and 1 road 100-Gb/s channel simultaneously, band efficiency reaches 100%, improve bandwidth availability ratio, the system cost of reduction.
Utility model content
The not enough problem of cost and bandwidth availability ratio in order to overcome existing bandwidth efficiency modulation pattern, the utility model discloses a kind of be applied to mixed type move forward pass, provide the wavelength division multiplexing type passive optical network of mixed type 10-Gb/s and 100-Gb/s channel that light carrier is carried out high efficiency bandwidth modulation simultaneously, system carries out high efficiency bandwidth modulation by using nyquist frequency multiplex technique to integrate independent sideband modulation form to light carrier.Utilize an optical transmitter, produce mixing 4 road 10-Gb/s and the downstream transmission signals of 1 road 100-Gb/s simultaneously.This technology has only to an arbitrary source, a light I/Q modulator and optical line terminal and just can produce and carry the upper side band of individual transmission information and lower sideband thus improve bandwidth availability ratio.
Mobile forward pass concept is as the development with base station radio-frequency equipment of new generation of formulating of general common radio-frequency interface CPRI and forms distributed base station and propose.The function of original base station is divided into a Base Band Unit BBU being positioned at center and several remote radio unit (RRU)s RRH by this base station.The corresponding multiple remote radio unit (RRU)s of such a Base Band Unit, it is possible to solve the covering of large stadium very well；It is also beneficial to reduce the quantity of base station, it is possible to effectively reduce cost and improve message capacity.
This utility model solves its technical problem and be the technical scheme is that
A kind of WDM passive optical network system producing 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；Described Base Band Unit is connected with described optical line terminal, described optical fiber branch device is connected between described optical line terminal and described optical network unit, described optical network unit is connected with described remote radio unit (RRU), further, described optical line terminal includes: lasing light emitter, independent sideband signals generation module, the first bandwidth power amplifier, the second bandwidth power amplifier and light I/Q modulator；The I road signal of described independent sideband signals generation module output is connected with the input of described first bandwidth power amplifier；The Q road signal of described independent sideband signals generation module output is connected with the input of described second bandwidth power amplifier；Described first bandwidth power amplifier, the output input with described smooth I/Q modulator respectively of the second bandwidth power amplifier are connected；The output of described lasing light emitter is connected with the input of described smooth I/Q modulator.
Further, described independent sideband signals generation module includes: utilizes field programmable logic array to control high-speed A/D converter and produces 4 road 10-Gb/s digital signals and the digital signal generation module of 1 road 100-Gb/s digital signal, realizes carrying upper side band and the independent sideband modulation module of lower sideband 4+1 road plural number mixed signal of individual transmission information and the distortion of HFS before transmission being done the pre-equalization process module pre-compensated for；The output of described digital signal generation module is connected with the input of described independent sideband modulation module, and the output of described independent sideband modulation module is connected with the input of described pre-equalization process module.
Further, include between described optical line terminal and described optical network unit that Optical Distribution Network, described Optical Distribution Network include: fiber amplifier, standard single-mode fiber and optical fiber branch device；The input of described fiber amplifier is connected with the output of described smooth I/Q modulator；The output of described fiber amplifier is transmitted on described standard single-mode fiber；The input of described optical fiber branch device is connected with the output of described standard single-mode fiber；The output of described optical fiber branch device is connected with the input of described optical network unit.
Further, described optical network unit includes: tunable optical filter, integrated coherent optical heterodyne communicatio and analog digital conversion and signal processing module；The input of described tunable optical filter is connected with the output of described Optical Distribution Network；The output of described tunable optical filter is connected with the input of described integrated coherent optical heterodyne communicatio；The output of described integrated coherent optical heterodyne communicatio is connected with the input of described analog digital conversion and signal processing module.
The beneficial effects of the utility model are: can effectively reduce cost and improve bandwidth availability ratio.
Below in conjunction with drawings and Examples, this utility model is described in further detail, but a kind of WDM passive optical network system producing mixing transmission signal of the present utility model is not limited to embodiment.
Accompanying drawing explanation
Fig. 1 moves the structural representation of forward pass passive optical network for the wavelength-division multiplex that this utility model embodiment provides；
The structural representation of the optical line terminal that Fig. 2 provides for this utility model embodiment；
The structural representation of independent sideband signals generation module on the optical line terminal that Fig. 3 provides for this utility model embodiment；
The independent 4 road 10-Gb/s PM-QPSK spectrograms that Fig. 4 provides for this utility model embodiment；
The independent 1 road 100-Gb/s 16QAM spectrogram that Fig. 5 provides for this utility model embodiment；
The mixing independent sideband spectrogram that Fig. 6 provides for this utility model embodiment；
The structural representation of the Optical Distribution Network that Fig. 7 provides for this utility model embodiment；
The structural representation of the optical network unit that Fig. 8 provides for this utility model embodiment；
The connection diagram of optical line terminal, Optical Distribution Network and optical network unit that Fig. 9 provides for this utility model embodiment.
In figure:
null1、Base Band Unit，2、Optical line terminal，3、Optical fiber branch device，4、Optical network unit，5、Remote radio unit (RRU)，6、Lasing light emitter，7、I/Q modulator，8、Independent sideband signals generation module，91、First bandwidth power amplifier，92、Second bandwidth power amplifier，10、Plural number I road signal，1010、Plural number Q road signal，11、Mixed signal exports，12、Digital signal generation module，13、PM-QPSK data map，14、16-QAM data map，15、Fiber amplifier，16、Standard single-mode fiber，17、Transmitting signal exports，18、Optical Distribution Network，19、Tunable optical filter，20、Integrated coherent optical heterodyne communicatio，21、Analog digital conversion and signal processing module，22、Nyquist filtering and down-converted，23、Nyquist filtering and upconversion process，24、Pre-equalization process module.
Detailed description of the invention
Fig. 1 is the structural representation that wavelength-division multiplex based on mobile forward pass moves forward pass passive optical network, this system is made up of a Base Band Unit 1 being positioned at center and several remote radio unit (RRU)s 5, signal can be amplified or Up/Down Conversion by the signal branch utilizing an optical fiber branch device 3 to be transmitted by Base Band Unit 1 and optical line terminal 2 to several optical network units 4, remote radio unit (RRU) 5.
Fig. 2 is the signal modulation principle figure of the mixing 4 road 10-Gb/s and 1 road 100-Gb/s that integrate independent sideband modulation form on optical line terminal based on nyquist frequency multiplex technique, including lasing light emitter 6, light I/Q modulator 7, independent sideband signals generation module 8 and and the first bandwidth power amplifier 91, second bandwidth power amplifier 92, concrete:
Lasing light emitter 6, its Main Function is used to produce continuous light carrier wave.
Light I/Q modulator 7, its Main Function is to be modulated on light carrier by the mixing signal of telecommunication, transmits in optical fiber link such that it is able to realize the mixing signal of telecommunication.
Independent sideband signals generation module 8, the structural representation of independent sideband signals generation module is as it is shown on figure 3, include digital signal generation module 12, independent sideband modulation module and pre-equalization process module 24, concrete:
Digital signal generation module 12, become logic array (FPGA) and high-speed A/D converter (DAC) to form signal source by field alterable, utilize FPGA to control DAC and realize 5 railway digital signals generation (i.e. 4 road 10-Gb/s and 1 road 100-Gb/s signal) respectively.
Independent sideband modulation module, 4 road 10-Gb/s and 1 road 100-Gb/s signal are carried out independent sideband modulation, and 4 road 10-Gb/s digital signals carry out independent PM-QPSK data respectively and map 13, Nyquist (Nyquist) filtering and down coversion 22 to lower sideband (N as shown in Figure 41-N4Position)；1 road 100-Gb/s digital signal carries out 16-QAM data and maps 14, Nyquist (Nyquist) filtering and up-conversion 23 to upper side band (such as the P in Fig. 51).It is achieved thereby that carry upper side band and lower sideband 4+1 plural number (IQ) mixed signal of individual transmission information.The spectral shape of 4+1 independent sideband subchannel is square, is the maximum way of realization of signal spectrum utilization rate, and the protection between subchannel is set to 0.1GHz.Wherein, Fig. 4 is independent 4 road 10-Gb/s PM-QPSK spectrograms；Fig. 5 is independent 1 road 100-Gb/s 16QAM spectrogram；Fig. 6 is mixing independent sideband (mixing 4 road 10-Gb/s and 1 road 100-Gb/s) spectrogram.
Pre-equalization process module 24, for the frequency response unevenness phenomenon of photoelectric device, carries out pre-equalization process to signal, pre-compensate for for its distortion of HFS before transmission, obtaining plural number I, Q road signal (10&1010), 10 represent I road signal, and 1010 represent Q road signal.
First bandwidth power amplifier 91, its Main Function is that the I road signal obtained is realized power amplification.
Second bandwidth power amplifier 92, its Main Function is that the Q road signal obtained is realized power amplification.
The mixed signal 11 coupled into optical fibres link transmission of light I/Q modulator 7 output.
Fig. 7 is the structural representation of Optical Distribution Network 18, including fiber amplifier 15, standard single-mode fiber 16 and optical fiber branch device 3, concrete:
Fiber amplifier 15, for realizing amplification to the signal in propagating.
Standard single-mode fiber 16, for signal is carried out certain distance transmission, realizes transmission signal output 17 in terminal.
Optical fiber branch device, for receiving the transmission signal of described standard single-mode fiber output, and transmission signal branch to several optical network units 4.
Fig. 8 is the structural representation of optical network unit, including tunable optical filter 19, integrated coherent optical heterodyne communicatio 20 and analog digital conversion and signal processing module 21, concrete:
Tunable optical filter 19, for carrying out wavelength selection, demultiplexing process to flashlight.
Integrated coherent optical heterodyne communicatio 20, for being mixed through optical mixer unit with the flashlight received by local oscillator light, signal is down-converted to micro-carrier frequency from light carrier frequency, then passes through photoelectric detector inspection center frequency, again it is demodulated and backoff algorithm, so that it may obtain baseband signal output.
Analog digital conversion and signal processing 21, for the signal after relevant detection carries out analog digital conversion, signal is sampled by recycling digital processing method and dispersion compensation processes, and utilizes constant modulus algorithm depolarization multiplexing, utilizes least mean square algorithm to carry out phase recovery.
Further, as it is shown in figure 9, described Optical Distribution Network 18 is connected between described optical line terminal 2 and described optical network unit 4.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (4)
1. produce a WDM passive optical network system for 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；Described Base Band Unit is connected with described optical line terminal, described optical fiber branch device is connected between described optical line terminal and described optical network unit, described optical network unit is connected with described remote radio unit (RRU), it is characterised in that described optical line terminal includes:
Lasing light emitter, independent sideband signals generation module, the first bandwidth power amplifier, the second bandwidth power amplifier and light I/Q modulator；The I road signal of described independent sideband signals generation module output is connected with the input of described first bandwidth power amplifier；The Q road signal of described independent sideband signals generation module output is connected with the input of described second bandwidth power amplifier；Described first bandwidth power amplifier, the output input with described smooth I/Q modulator respectively of the second bandwidth power amplifier are connected；The output of described lasing light emitter is connected with the input of described smooth I/Q modulator.
The WDM passive optical network system of generation mixing transmission signal the most according to claim 1, it is characterised in that described independent sideband signals generation module includes:
Utilize field programmable logic array to control high-speed A/D converter to produce 4 road 10-Gb/s digital signals and the digital signal generation module of 1 road 100-Gb/s digital signal, realize carrying upper side band and the independent sideband modulation module of lower sideband 4+1 road plural number mixed signal of individual transmission information and the distortion of HFS before transmission being done the pre-equalization process module pre-compensated for；The output of described digital signal generation module is connected with the input of described independent sideband modulation module, and the output of described independent sideband modulation module is connected with the input of described pre-equalization process module.
The WDM passive optical network system of generation mixing transmission signal the most according to claim 2, it is characterised in that include between described optical line terminal and described optical network unit that Optical Distribution Network, described Optical Distribution Network include:
Fiber amplifier, standard single-mode fiber and optical fiber branch device；The input of described fiber amplifier is connected with the output of described smooth I/Q modulator；The output of described fiber amplifier is transmitted on described standard single-mode fiber；The output of described standard single-mode fiber is connected with the input of described optical fiber branch device；The output of described optical fiber branch device is connected with the input of described optical network unit.
The WDM passive optical network system of generation mixing transmission signal the most according to claim 3, it is characterised in that described optical network unit includes:
Tunable optical filter, integrated coherent optical heterodyne communicatio and analog digital conversion and signal processing module；The input of described tunable optical filter is connected with the output of described Optical Distribution Network；The output of described tunable optical filter is connected with the input of described integrated coherent optical heterodyne communicatio；The output of described integrated coherent optical heterodyne communicatio is connected with the input of described analog digital conversion and signal processing module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN112073927A (en) * | 2020-08-11 | 2020-12-11 | 北京华电天仁电力控制技术有限公司 | Ecological network system based on eLTE and GPON |
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2016
- 2016-05-12 CN CN201620429387.7U patent/CN205725760U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111077519A (en) * | 2020-01-15 | 2020-04-28 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN111077519B (en) * | 2020-01-15 | 2022-09-02 | 中国人民解放军空军预警学院 | Microwave photon radar implementation method and system |
| CN112073927A (en) * | 2020-08-11 | 2020-12-11 | 北京华电天仁电力控制技术有限公司 | Ecological network system based on eLTE and GPON |
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Granted publication date: 20161123 |