CN105516831A - Microwave-photonic-filter-based raman suppression system of optical access network - Google Patents
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- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
Abstract
Disclosed in the invention is a microwave-photonic-filter-based raman suppression system of an optical access network. The system is composed of an optical line terminal, a feeder type fiber, an optical remote node, a plurality of distributed fibers, and a plurality of optical network units. The optical line terminal is connected to the optical remote node by the feeder type fiber; the optical remote node is connected with the optical network units by the distributed fibers. According to the invention, with a cascaded semiconductor optical amplifier, on the one hand, the power of the downlink signal is amplifier; and on the other hand, pretreatment on the low-frequency component of the signal is realized by using the high-pass attribute, namely, microwave photonic filer, at the deep saturation area, so that the raman scattered noise influence on the existing optical transmission system by the next-generation optical access network system is reduced. No extra high-speed electric processing module is required and multiple purposes of one signal device is realized, so that the system cost is reduced to the certain extent.
Description
Technical field
The present invention relates to the communication technology neck of Optical Access Network, the Raman relating to a kind of optical access network based on microwave photon filtering particularly suppresses system.
Background technology
Along with improving constantly of social informatization degree, continuing to bring out of the emerging services such as the passback of IPTV, HD video, mobile multimedia, wireless data and forward pass, the demand of terminal use to access bandwidth is more and more higher.User access networks (wire/wireless) as " last one kilometer " then develop slower, directly affects the development and utilization of volume of business, quality, speed and the Internet resources that communication network can provide, become the bottleneck of restriction the whole network development.Meanwhile, wireless access network (RAN, Radioaccessnetwork) as the critical asset that mobile operator depends on for existence, along with the rise of mobile Internet, Internet of Things, being faced with unprecedented challenge: the mode 1) promoting RAN access capability by strengthening air interface capability, bringing high energy consumption; 2) high RAN capital expenditures (CAPEX, CapitalExpenditure) and operation cost (OPEX, OperatingExpense); 3) tidal effect of customer service, causes low base station utilance; 4) access flow of user and the income amplification of operator seriously disproportionate.
Wave stack PON technology adopts hybrid multiplex technology (WDM and TDM or WDM and OrthogonalOFDM), user realizes cost maximum revenue target to bandwidth upgrading and Virtual network operator can be met, elected as PON major technique direction of future generation by IEEE-USA of International Organization for standardization (IEEE) and standardization department of international telecommunication union telecommunication/FSAN forum (ITU-T/FSAN).Wave stack PON system is the same with existing PON system, and the throughput of different PON subsystem internal greatly changes along with the characteristic variations of user, and presents " tidal phenomena " along with the characteristic of customer group, and this reduces network resource utilization to a certain extent.Meanwhile, according to NTT statistics, from whole trend of network development, PON system user approach to saturation, and future development needs more new business and based on wave stack mode integrated system.Therefore, on the framework of wave stack PON system, realize family, enterprise, the Full-Services access such as wireless be one of main flow direction of its development.
But, in systems in practice, merge the downlink transfer of Access Network based on the wireless forward pass of wave stack PON and light, with traditional PON business as CATV coexist time, system descending signal brings Raman scattering will have an impact to CATV signal.Simultaneously, in order to not affect the transmission performance of traditional passive optical-fiber network, keep and the compatibility feature of laying EPON in the past, the most of wavelength resource in wavelength O wave band (O-band), S-wave band (S-band), C-band (C-band) and L-band (L-band) before PON of future generation can not reuse in EPON all dispenses.For the signal in light of future generation and wireless hybrid access networks, its up-downgoing wavelength is arranged in C-band and L-band also not by the wavelength used.When incident optical power is larger, the nonlinear effect of optical fiber will cause influencing each other between the wavelength in light and wireless mixed transport network, stimulated raman scattering (SRS particularly in optical fiber, StimulatedRamanScattering), it can cause ill effect to the power and signal in respective wavelength.
Premenstruum (premenstrua), literature survey was known, researcher's international optical fiber letter meeting (OpticalFiberCommunicationConference of limited company of Huawei, OFC) delivered on " the delayed modulation technology in TWDM-PON system " (DelayModulationforTWDMPONs), encoded the Raman effect that lowers and exist in stacking TDM-PON system to the impact of RF-Video signal wavelength by electrical domain.Though the program effectively can solve Raman effect, need electric device at a high speed to carry out encoding and decoding, increase the cost of system to a certain extent; And this delay modulation changes the upturned position of bit in data flow " 1 ", thus carry out needing in demodulating process modifying to demodulator circuit the characteristics of signals that adapts to postpone modulation to it at receiving terminal.
Known through literature survey again, the researcher that U.S. NEC tests delivers on OFC " the 10Gb/s system that the generation that faces down PON and CATV coexists based on PSD control more than 5dB Raman scattering noise suppressed " (" Beyond5dBNonlinearRamanCrosstalkReductionviaPSDControlof 10Gb/sOOKinRF-VideoCoexistenceScenariosforNext-Generatio nPON), this paper mainly utilizes simple electrical domain filtering method to solve between TWDM-PON and RF-video due to impact that excited Raman brings, although the program can suppress Raman scattering effect to a certain extent, but the program with the receiving sensitivity of sacrificial system for cost.
Summary of the invention
The object of patent of the present invention is the problem for the Raman scattering noise suppression proposal in existing access net system, provides a kind of Raman of the optical access network based on microwave photon filtering of full light to suppress system.Before downlink light signal injection fibre of the present invention, first realize the predistortion of light signal through a microwave photon filter, thus realize reducing stacking PON system unit to the Raman scattering effect of existed system unit.Structure of the present invention is implemented simple, only need add a cascaded semiconductor image intensifer (SOA) or reflective semiconductor optical amplifier (RSOA) at optical line terminal (OLT), amplification and the preliminary treatment of downstream signal can be realized; And do not need to do any process in the electrical domain of system configuration.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Raman based on the optical access network of microwave photon filtering suppresses system, comprises optical line terminal, branched system optical fiber, light distant-end node, multiple distribution type fiber-optic and multiple optical network unit.Wherein, optical line terminal is by branched system Fiber connection to light distant-end node, and light distant-end node connects each optical network unit by distribution type fiber-optic.
Optical line terminal comprises some multiple descending data signal transmission modules, some multiple upstream data. signals data reception modules, wave multiplexer, channel-splitting filter and the cascaded semiconductor image intensifer based on SOA/RSOA, wherein: the input that multiple downlink data signal transmitter module is all connected to wave multiplexer with downlink data transmitter module is connected, the output of wave multiplexer is connected to the 1st port of the first optical circulator, and the 2nd port of the first optical circulator connects cascaded semiconductor image intensifer to realize predistortion and the amplification of downlink data; The multiple upstream data. signals receiver module of upstream data receiver module connects with the output of channel-splitting filter, the input of channel-splitting filter is connected to the 3rd port of the first optical circulator, and the 2nd port of the first optical circulator connects the reception that cascaded semiconductor image intensifer realizes upstream data;
Optical network unit comprises optic tunable filter, the second optical circulator, photodetector and upstream data. signals transmitter, one end of optic tunable filter connects the 2nd port that second connects optical circulator, connect photodetector after 3rd port output of the second optical circulator, thus complete the demodulation of downstream signal; Upstream data. signals transmitter realizes the transmitting of upstream data by the 1st port of optical circulator.
Preferably, downlink data signal transmitter module is divided into external modulation and directly modulation two kinds of forms according to modulation format:
1) external modulation transmitter module comprises: descending continuous light source CW, external modulator and downlink data signal.Descending continuous light source CW is connected to external modulator as descending light carrier, and downlink data signal, for driving external modulator, by bias voltage, makes external modulator be operated in the linear zone of its transmission curve, and then realizes the transmitting of downlink data.
Wherein, descending continuous light source CW is the CW light sources such as the vertical cavity surface emitting laser of distribution bragg reaction type Distributed Feedback Laser or Single wavelength; External modulator is the external modulator that Mach increases the two-forties such as Dare modulation or electroluminescent Absorption modulation device;
2) directly modulation transmitter module comprises: directly modulation laser, row data-signal and biasing circuit, directly modulation laser is connected with biasing circuit and row data-signal respectively, downstream signal is realized to be modulated on light carrier, wherein: pass through biasing circuit, make directly modulation laser works in the linear zone of its transmission curve, and then realize the transmitting of the descending multi-carrier modulation data based on bank of filters.
Wherein, directly modulation laser is the directly modulation laser (CML) of chirp management, or Distributed Feedback Laser, or VCSEL laser, or directly modulation lasers such as distributed Bragg reflection laser (DistributedBraggReflectorlaser, DBR) etc.;
Preferably, the wave multiplexer in optical line terminal and channel-splitting filter, for array waveguide grating or other passive/active wavelength division multiplexing conciliate multiplexing device;
Preferably, optical line terminal cascade semiconductor optical amplifier is SOA or RSOA;
Preferably, based on the cascaded semiconductor image intensifer of SOA/RSOA, be made up of amplifier and corresponding biasing circuit, biasing circuit is for the operating state of control SOA/RSOA cascade image intensifer, make it be operated in degree of depth saturation condition, thus realize predistortion and the amplification of downstream signal simultaneously;
Preferably, optic tunable filter is selected for the wavestrip of downstream signal;
Preferably, distant-end node can be the light shunt/mixer of 1:N, or light wave multiplexer, and it is mainly used in downstream signal to be distributed to each optical network unit be attached thereto by distribution type fiber-optic; Meanwhile, the upstream data of the different wave length of different optical network unit is coupled by mixer by distribution type fiber-optic, and the upstream data after coupling uploads to optical line terminal by branched system optical fiber and processes.
Preferably, above-mentioned N gets 64,128,256 or 512.
Preferably, downlink data signal transmitter module is M, and M gets 4,8 or 10.
Preferably, row photodetectors can be PIN or APD.
Compared with prior art, the present invention has following beneficial effect:
The design of based semiconductor image intensifer cascode device is held at OLT by the present invention, and regulate this cascode device to make it be operated in degree of depth saturation condition by biasing circuit, the self character of image intensifer can be utilized on the one hand to amplify downstream signal thus improve the incident optical power of downstream signal; On the other hand, make full use of when cascade SOA/RSOA is operated in degree of depth saturation condition and there is high pass characteristic, namely the function of microwave photon filter is realized, thus realize the process downlink data signal of its full light, filter its part low frequency cost, thus effectively realize the Raman scattering that stacking PON of future generation brings in real net system.This system configuration is simple, is easy to realize, and employing cascade SOA/RSOA realizes amplification simultaneously and namely microwave photon filter action realizes a kind of multiple use of device and then reduce system cost; Meanwhile, only process and electrical domain do not need to do any High-speed Electric process and just can realize Raman scattering noise that stacking PON system brings to having or the impact of Future Access Network system on light requirement.
Accompanying drawing explanation
Fig. 1 is the Raman suppression system construction drawing of the optical access network based on microwave photon filtering in patent of the present invention;
Fig. 2 is the structure principle chart of the downlink module in patent of the present invention, the transmitter module of (a) external modulation, (b) directly modulation module;
Fig. 3 is operated in the principle schematic under degree of depth saturation condition based on cascade SOA/RSOA.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
The present invention is directed to based in existing optical access network system, implement Next Generation Access system and the Raman scattering problem brought, design the system configuration of the suppression of the Raman scattering noise of the microwave photon filter based on cascade SOA/RSOA.
As shown in Figure 1, the present embodiment comprises: optical line terminal, branched system optical fiber, light distant-end node, multiple distribution type fiber-optic and multiple optical network unit.Wherein, optical line terminal passes through branched system Fiber connection to light distant-end node, light distant-end node connects each optical network unit by distribution type fiber-optic, concrete: optical line terminal is connected with one end of branched system optical fiber, the other end of branched system optical fiber connects light distant-end node, light distant-end node is that (N gets 64 to 1:N light shunt/mixer, 128, 256 or 512) or for the wavelength division multiplex device of N port (N gets 64, 128, 256 or 512, its this wavelength division multiplex device can be array waveguide grating or cyclic array waveguide raster), light shunt/mixer (Splitter) or wavelength division multiplexer are by distribution type fiber-optic connecting optical network unit 1, optical network unit 2, optical network unit N.Particularly, N value depends on the splitting ratio of light shunt mixer, N desirable 64,128,256 or 512.
Optical line terminal comprises M descending data signal transmission module, a M upstream data. signals data reception module, wave multiplexer, channel-splitting filter and cascaded semiconductor image intensifer, wherein: the input that M downlink data signal transmitter module is all connected to wave multiplexer with downlink data transmitter module is connected, the output of wave multiplexer is connected to the 1st port of the first optical circulator, and the 2nd port of the first optical circulator connects cascaded semiconductor image intensifer to realize predistortion and the amplification of downlink data; The multiple upstream data. signals receiver module of upstream data receiver module connects with the output of channel-splitting filter, the input of channel-splitting filter is connected to the 3rd port of the first optical circulator, and the 2nd port of the first optical circulator connects the reception that cascaded semiconductor image intensifer realizes upstream data; Concrete M value depends on the downstream rate in the PON system of upgrading, M desirable 4,8 or 10 etc.
Downlink data signal transmitter module generation M road (M=4 or 8 or 10) is modulated at the downstream signal on different wave length, after wave multiplexer, is input to branched system optical fiber transmits by the first optical circulator by cascaded semiconductor image intensifer after being amplified.
Further, the structure of downlink data signal transmitter module is as shown in Fig. 2 (a) He (b), and wherein Fig. 2 (a), downlink data signal transmitter module comprises descending continuous light source CW, external modulator and downlink data signal.Descending continuous light source CW is connected to external modulator as descending light carrier, and downlink data signal, for driving external modulator, by bias voltage, makes external modulator be operated in the linear zone of its transmission curve, and then realizes the transmitting of downlink data.In Fig. 2 (b), downlink data signal transmitter module comprises directly modulation laser, row data-signal and biasing circuit, directly modulation laser is connected with biasing circuit and row data-signal respectively, downstream signal is realized to be modulated on light carrier, wherein: pass through biasing circuit, make directly modulation laser works in the linear zone of its transmission curve, and then realize the transmitting of the descending multi-carrier modulation data based on bank of filters.
Light shunt/the mixer of distant-end node or wavelength division multiplexer are in order to be distributed to each optical network unit be attached thereto by distribution type fiber-optic by downlink data signal; Meanwhile, the upstream data of the different wave length of different optical network unit is coupled by mixer or wavelength division multiplexer by distribution type fiber-optic, and the upstream data after coupling uploads to optical line terminal by branched system optical fiber and processes.
Again as shown in Figure 1, optical network unit comprises optic tunable filter, the second optical circulator, photodetector and upstream data. signals transmitter, one end of optic tunable filter connects the 2nd port that second connects optical circulator, connect photodetector after 3rd port output of the second optical circulator, thus complete the demodulation of downstream signal; The output of upstream data. signals transmitter is connected to optical circulator the 1st port, is realized the transmitting of upstream data by the 1st port of optical circulator, is entered optic tunable filter by the 2nd port of optical circulator and then is realized the output of upstream data.
Wherein, in PON system, tunable filter is exist to stacking PON or WDM-PON system, is non-existent to TDM-PON.
Downlink data signal receiver module is made up of PD and tunable optical filter; Tunable optical filter is used for the selection of the multi-carrier modulation data-signal of down going wave device group.Downlink data signal is realized the selection of downstream signal, arrives downlink data receiver module, and then realize the detection of downstream signal via the second optical circulator after arriving optical network unit by distribution type fiber-optic by tunable optical filter.
Based on the cascaded semiconductor image intensifer of SOA/RSOA, mainly be made up of amplifier and corresponding biasing circuit, biasing circuit is mainly used in the operating state of control SOA/RSOA cascade image intensifer, makes it be operated in degree of depth saturation condition, thus realizes predistortion and the amplification of downstream signal simultaneously; The structure of its cascade SOA/RSOA image intensifer and operating state signal are as shown in Figure 3.
The present embodiment adopts based on photon microwave filtering technology in the transmission system of wave stack EPON of future generation, has following advantage:
1) system configuration should be suppressed based on the Raman of the Access Network of photon microwave filtering, utilize the self character of image intensifer to amplify downstream signal thus improve the incident optical power of downstream signal, not changing the transmitting power reponse (projector power response) utilizing amplifier raising downstream signal that existing wave stack PON system proposes;
2) make full use of when cascade SOA/RSOA is operated in degree of depth saturation condition and there is high pass characteristic, namely the function of microwave photon filter is realized, thus realize the process downlink data signal of its full light, filter its part low frequency cost, thus effectively realize the Raman scattering that stacking PON of future generation brings in real net system.
3) this system configuration is simple, is easy to realize, and employing cascade SOA/RSOA realizes amplification simultaneously and namely microwave photon filter action realizes a kind of multiple use of device and then reduce system cost; Meanwhile, only process and electrical domain do not need to do any High-speed Electric process and just can realize Raman scattering noise that stacking PON system brings to having or the impact of Future Access Network system on light requirement.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. the Raman based on the optical access network of microwave photon filtering suppresses system, it is characterized in that comprising optical line terminal, branched system optical fiber, light distant-end node, multiple distribution type fiber-optic and multiple optical network unit; Optical line terminal is by branched system Fiber connection to light distant-end node, and light distant-end node is by distribution type fiber-optic connecting optical network unit.
2. the Raman of the optical access network based on microwave photon filtering according to claim 1 suppresses system, it is characterized in that optical line terminal comprises multiple descending data signal transmission module, multiple upstream data. signals receiver module, wave multiplexer, channel-splitting filter and cascaded semiconductor image intensifer, wherein: the input that multiple downlink data signal transmitter module is all connected to wave multiplexer with downlink data transmitter module is connected, the output of wave multiplexer is connected to the 1st port of the first optical circulator, 2nd port of the first optical circulator connects cascaded semiconductor image intensifer to realize predistortion and the amplification of downlink data, the multiple upstream data. signals receiver module of upstream data receiver module connects with the output of channel-splitting filter, the input of channel-splitting filter is connected to the 3rd port of the first optical circulator, and the 2nd port of the first optical circulator connects the reception that cascaded semiconductor image intensifer realizes upstream data.
3. the Raman of the optical access network based on microwave photon filtering according to claim 2 suppresses system, it is characterized in that optical network unit comprises optic tunable filter, the second optical circulator, photodetector and upstream data. signals transmitter, one end of optic tunable filter connects the 2nd port that second connects optical circulator, connect photodetector after 3rd port output of the second optical circulator, thus complete the demodulation of downstream signal; Upstream data. signals transmitter realizes the transmitting of upstream data by the 1st port of optical circulator.
4. the Raman of the optical access network based on microwave photon filtering according to claim 3 suppresses system, it is characterized in that downlink data signal transmitter module is divided into external modulation and directly modulation two kinds of forms according to modulation format.
5. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, it is characterized in that downlink data signal transmitter module is external modulation transmitter module, specifically comprises descending continuous light source CW, external modulator and downlink data signal; Descending continuous light source CW is connected to external modulator as descending light carrier, and downlink data signal, for driving external modulator, by bias voltage, makes external modulator be operated in the linear zone of its transmission curve, and then realizes the transmitting of downlink data; Wherein, descending continuous light source CW is the vertical cavity surface emitting laser of distribution bragg reaction type Distributed Feedback Laser or Single wavelength; External modulator is that Mach increases Dare modulator or electroluminescent Absorption modulation device.
6. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, it is characterized in that downlink data signal transmitter module is directly modulation transmitter module, specifically comprise directly modulation laser, row data-signal and biasing circuit, directly modulation laser is connected with biasing circuit and row data-signal respectively, downstream signal is realized to be modulated on light carrier, wherein: pass through biasing circuit, make directly modulation laser works in the linear zone of its transmission curve, and then realize the transmitting of the descending multi-carrier modulation data based on bank of filters; Wherein, directly modulation laser is the directly modulation laser of chirp management or Distributed Feedback Laser or VCSEL laser or distributed Bragg reflection laser.
7. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, it is characterized in that the wave multiplexer in optical line terminal and channel-splitting filter, for array waveguide grating or other passive/active wavelength division multiplexing conciliate multiplexing device.
8. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, and its feature is SOA or RSOA at optical line terminal cascade semiconductor optical amplifier.
9. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, it is characterized in that light distant-end node is light shunt/mixer or the light wave multiplexer of 1:N, and N gets 64,128,256 or 512.
10. the Raman of the optical access network based on microwave photon filtering according to claim 4 suppresses system, and it is characterized in that downlink data signal transmitter module is M, M gets 4,8 or 10.
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| CN106153089A (en) * | 2016-06-22 | 2016-11-23 | 燕山大学 | A kind of distributed optical fiber sensing system |
| CN109982171A (en) * | 2019-03-20 | 2019-07-05 | 东南大学 | One kind can zoom out multi-hop optical access network and intelligent management system |
| CN114173226A (en) * | 2021-11-09 | 2022-03-11 | 武汉邮电科学研究院有限公司 | Novel passive optical network system based on distributed Raman optical amplifier |
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