CN101827288A - Variable wavelength-based hybrid optical access system - Google Patents
Variable wavelength-based hybrid optical access system Download PDFInfo
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Abstract
The invention discloses a variable wavelength-based hybrid optical access system, which comprises an optical line terminal (OLT) part, a remote node (RN) part and an optical network unit (ONU) part connected together through an optical fiber circuit, wherein the OLT part comprises a plurality of optical transceiver modules TRX; when an injection-locked Fabry-Perot laser diode (FP-LD) or reflection semiconductor optical amplifier (RSOA) is adopted at the transmitting end Tx of each optical transceiver module TRX, the common end of a first wave multiplexer/de-multiplexer MUX/DEMUX1 is connected with a light source SL through a wavelength division multiplexed (WDM) component and the output end of the WDM component is connected with the optical fiber circuit; or when a fixed wavelength laser or adjustable wavelength laser is used at the transmitting end Tx of the optical transceiver module, the common end of the first wave multiplexer/de-multiplexer MUX/DEMUX1 is connected with the optical fiber circuit directly. The variable wavelength-based hybrid optical access system of the invention can adapt to the network deployment of each operator so as to realize smooth updating of the network structure, solve the problems of the shortage of the optical fiber resource, the inventory cost and the maintenance cost and meet the requirements on the bandwidth and speed.
Description
Technical field
The present invention relates to the optical communication technique field, especially the passive access optical-fiber network of the light of Hun Heing technical field is a kind of specifically based on wavelength variable hybrid optical access system.
Background technology
In recent years, along with the sustained and rapid development of the Internet, various new business emerge in an endless stream, and people are continued to increase the demand of network insertion bandwidth, business such as particularly online game, video conferencing, video request program make traditional access way can't satisfy the demand of bandwidth.According to the related data analysis, following 3 years user's average bandwidth demands will be above 10Mbit/s., wireless access technology wired with other compared, and optical fiber inserts has impayable advantage aspect bandwidth capacity and the coverage distance.Along with the appearance of low-cost PON (EPON) technology and the quick decline of rapid maturation and optical fiber cable cost, the idea of operator's Access Network fiberize progressively is achieved.Therefore, operator has begun to start FTTx (optical fiber to the abbreviation of x, for example FTTH, FTTC, FTTB etc.) and has built.Along with operator begins Large scale construction FTTx network, the present metropolitan area fiber resource particularly present situation of conduit resource anxiety will become more outstanding.If can directly utilize existing metropolitan area fibre circuit, will greatly reduce construction funds invested, shorten the construction period.Therefore propose to mix the EPON of access based on wavelength division multiplexing (WDM:Wavelength DivisionMultiplexed), time division multiplexing (TDM:Timing Division Multiplexed) mode, promptly hybrid passive optical network (HPON:Hybrid PassiveOptical Network) is the optimum method that solves bandwidth, speed, resource anxiety.
A typical HPON system configuration comprises optical line terminal (OLT:Optical LineTermination), circuit optical fiber (fiber), far-end node unit (RN:Remote Node), optical network unit composition (ONU:Optical Network Unit), sees Fig. 1.OLT comprises that (TRX1～TRXn), first closes ripple/channel-splitting filter (MUX/DEMUX1) to optical transceiver module, this multiplexer/demultiplexer is periodic array waveguide grating (AWG:Array Waveguide Grating), comprises the AWG that needs temperature control or do not need temperature control circuit; Fibre circuit can be different lengths such as 10km, 20km; RN comprise second close ripple/channel-splitting filter (MUX/DEMUX2) and luminous-power distributor Splitter (S1～Sn), wherein MUX/DEMUX2 can be based on periodically identical function devices such as Heatless AWG; ONU comprises the optical transceiver module part.If the light source among OLT and the ONU is by direct modulation or modulate the laser with fixed wavelength realization indirectly, the significant problem that produces is need prepare the OLT optical module of different wave length and the ONU optical module of different wave length when the HPON system installs, not only need a large amount of specific wavelength inventories, and need multi-wavelength's optical module standby, be difficult for carrying out the maintenance of OLT and ONU optical module.Because Access Network is very responsive to economy, thereby have great significance for the implementation method research of OLT, ONU among the HPON.Therefore people wish by realizing OLT among the HPON, ONU optical module someway colourlessly, so just can reduce manufacturer's inventory cost and maintenance cost, the wavelength configuration flexibility of raising network.
There is not patent to describe the concrete technical scheme of the system of the HPON that adopts the non-colored light module at present.The colourless colourless light source that tunable laser is arranged, cut apart based on wide range of realizing optical module, colourless based on catoptric arrangement, wherein based on catoptric arrangement colourless comprise the RSOA (ReflectionSemiconductor Optical Amplifier) of FP-LD (Fabry-Perot Laser Diode), the injection locking mode of injection locking mode, based on the Wavelength reuse technology of RSOA.The colourless light source of cutting apart based on wide range and based on colourless seed light source (SL:Seed Light), transmission range, the modulation rate of being subject to of catoptric arrangement is not suitable in the HPON system.Above-mentioned two kinds of schemes of injection locking based on RSOA and FP-LD, all there is certain defective in they, especially the present limited problem of optical device, make the rate-constrained of transmission signals in 1.25Gb/s, distance is subject in the 20km, and uses the problem that also needs to consider seed light in HPON.Equally, the colourless demand of cutting apart based on wide range that can not satisfy HPON colourless, that realize based on the Wavelength reuse technology of RSOA.
Summary of the invention
At the defective that exists in the prior art, the object of the present invention is to provide a kind of based on wavelength variable hybrid optical access system, the network design that can adapt to each operator, realize network architecture smooth upgrade, solution fiber resource anxiety, satisfy the requirement of bandwidth and speed, solve inventory cost and maintenance cost.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of based on wavelength variable hybrid optical access system, comprise the OLT part, RN part and the ONU part that connect by fibre circuit, it is characterized in that OLT partly comprises:
Some optical transceiver module TRX carry out separating of receiving terminal and transmitting terminal light signal in TRX inside by the WDM device, and receiving terminal and transmitting terminal wave band are same wave band, or are different-waveband, and up-downgoing light signal wave band is same wave band, or is different-waveband;
The transmitting terminal Tx of described OLT part optical transceiver module TRX adopts injection locking FP-LD or RSOA, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 connects seed light source SL by the WDM assembly, the output of WDM assembly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN (photodiode) or APD (avalanche diode) device;
Or: the transmitting terminal Tx of described OLT part optical transceiver module TRX adopts laser with fixed wavelength or wavelengthtunable laser, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 directly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN or APD device.
On the basis of technique scheme, described RN partly comprises: directly connect fibre circuit the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 and with the some one to one luminous-power distributor Sn of the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 output port, n=1,2,3,
The described second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 has periodic array waveguide grating, the multiplexing and demultiplexing of up, the downstream signal of finishing that wavelength and its respective channel meet,
Described luminous-power distributor Sn adopts and draws the mode of awl to constitute, and downstream signal is carried out luminous power cut apart, and upward signal is carried out power combination;
Each luminous-power distributor Sn connects several ONU.
On the basis of technique scheme, the transmitting terminal of ONU part adopts the wavelengthtunable laser as transmitting element, and receiving terminal PD is normally used PIN or APD,
Described ONU adopts the single fiber bi-directional structure, and the transmitting-receiving wavelength of optical signal is operated in same wave band, or is operated in different-waveband.
Of the present invention based on wavelength variable hybrid optical access system, can adapt to the network design of each operator, realize network architecture smooth upgrade, solve the fiber resource anxiety, satisfy the requirement of bandwidth and speed, solve inventory cost and maintenance cost.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1, typical WDM-PON system configuration schematic diagram;
Fig. 2, HPON system schematic one of the present invention;
Fig. 3, HPON system schematic two of the present invention;
Fig. 4, the embodiment of the invention one;
Fig. 5, the embodiment of the invention two;
Fig. 6, the embodiment of the invention three;
Fig. 7, the embodiment of the invention four.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As Fig. 2, shown in 3, of the present invention based on wavelength variable hybrid optical access system, be based on the HPON system of tunable laser, adopt the structure difference according to OLT, the HPON system that is divided into two kinds of structures, include the OLT part that connects by fibre circuit, RN part and ONU part, in the local side OLT side, non-colored light module transmitting terminal has two kinds of implementations, the injection locking mode (see figure 2) that seed light source is promptly arranged, the tunable laser mode of no seed light source or fixed laser (see figure 3), optical transceiver module TRX internal interface receiving end Rx adopts PIN or APD device.Wherein, OLT partly comprises:
Some optical transceiver module TRX carry out separating of receiving terminal and transmitting terminal light signal in TRX inside by the WDM device, and receiving terminal and transmitting terminal wave band are same wave band, or are different-waveband, and up-downgoing light signal wave band is same wave band, or is different-waveband;
As shown in Figure 2, the transmitting terminal Tx of described OLT part optical transceiver module TRX adopts injection locking FP-LD or RSOA, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 connects seed light source SL (Seed Light) by the WDM assembly, the output of WDM assembly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN (photodiode) or APD (avalanche diode) device;
Among Fig. 2, the OLT part: carry out separating of receiving terminal and transmitting terminal light signal in optical module TRX inside by the WDM device, the employed wavelength of receiving terminal and transmitting terminal can be same wave band, also can make different-waveband, and SL need be provided.
The RN part: Wavelength division multiplexer/demultiplexer can be film filter or array waveguide grating, is positioned at far-end, the multiplexing and demultiplexing of the upstream and downstream signal that permission wavelength and its respective channel meet.Luminous-power distributor generally is to adopt to draw the mode of awl to constitute, and mainly downstream signal is carried out luminous power and cuts apart, and upward signal is carried out power combination;
ONU part: carry out separating of receiving terminal and transmitting terminal light signal by the WDM device in TRX inside.Adopt laser based on wavelength-tunable as transmitting element at transmitting terminal, receiving terminal PD is normally used PIN or APD.Adopt the single fiber bi-directional structure, the transmitting-receiving wavelength of optical signal can be operated in same wave band, also can be different-waveband.
Or:
As shown in Figure 3, the transmitting terminal Tx of described OLT part optical transceiver module TRX adopts laser with fixed wavelength or wavelengthtunable laser, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 directly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN or APD device;
Among Fig. 3, the OLT part: carry out separating of receiving terminal and transmitting terminal light signal in TRX inside by the WDM device, receiving terminal and transmitting terminal can make same wave band, also can make different-waveband, do not need SL.The up-downgoing light signal can be same wave band, also can be different-waveband.
RN and ONU part and shown in Figure 2 identical no longer are described.
On the basis of technique scheme, described RN partly comprises: directly connect fibre circuit the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 and with the some one to one luminous-power distributor Sn of the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 output port, n=1,2,3,
The described second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 has periodic array waveguide grating, the multiplexing and demultiplexing of up, the downstream signal of finishing that wavelength and its respective channel meet;
Described luminous-power distributor Sn adopts and draws the mode of awl to constitute, and downstream signal is carried out luminous power cut apart, and upward signal is carried out power combination;
Each luminous-power distributor Sn connects several ONU.The mixing that the present invention adopts wavelength division multiplexing and time division multiplexing mode to form inserts EPON, the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 place is wavelength-division, carried out power division at luminous-power distributor Sn place, for upward signal is exactly time division multiplexing, and promptly a plurality of ONU adopt the light signal of same wavelength.
On the basis of technique scheme, the transmitting terminal of ONU part adopts the wavelengthtunable laser as transmitting element, and receiving terminal PD is normally used PIN or APD.
Described ONU adopts the single fiber bi-directional structure, and the transmitting-receiving wavelength of optical signal is operated in same wave band, or is operated in different-waveband.
The OLT side of system shown in Fig. 2,3 can adopt two fine structures, and promptly optical module uses the HPON system that receiving terminal and transmitting terminal separate.Adopt the HPON structure of above two kinds of tunable lasers, wavelength-tunable makes network configuration flexible, and the HPON structure can be saved present city fiber resource, helps the smooth upgrade of the network architecture, also can provide higher bandwidth for the large user simultaneously.
Below in conjunction with specific embodiment, further specify system of the present invention.
Fig. 4,5 local sides adopt the injection locking FP-LD or the RSOA mode of straight accent mode, and local side needs SL, and user side adopts the directly or indirectly tunable laser optical module mode of modulation.
The model of optical module that local side adopts can be IL-FPLD-L-1G or IL-RSOA-L-1G; User side adopts the model of optical module can be TTRX-C-1G.
Fig. 6,7 local sides adopt directly or the laser with fixed wavelength or the tunable laser optical module of indirect modulation, do not need SL, the tunable laser optical module mode that user side adopts directly modulation or modulates indirectly.
The model of optical module that local side adopts can be TTRX-L-1G; User side adopts the model of optical module can be TTRX-C-1G.
Fig. 4 is embodiments of the invention one, and this exemplary application is in the network application scene that all is little client, and each client does not need too high bandwidth, realizes that 4 ONU share the bandwidth resources of a wavelength.Present embodiment OLT side comprises that seed light source SL, WDM assembly, periodicity AAWG1 and optical module TRX form, distant-end node RN is by periodicity AAWG2 and 32 1: 4 splitter S1 ... S32 forms, the optical module of ONU inside is the optical module of transceiver, it is colourless that transmitting terminal all adopts tunable laser to realize, receiving terminal PD adopts APD or PIN.C-band or L-band are respectively as service band up, downstream signal.
Down direction: SL is used for the seed light source partly held as OLT side TRX, by a WDM assembly, deliver to the FP-LD or the RSOA device of injection locking device then, single longitudinal mode light signal of locking output, close the road to trunk optical fiber through AAWG1 again, transfer to RN.RN outputs to 32 luminous-power distributor S1, S2 through the wavelength separated of AAWG2 ... S32 divides 4 road to ONU side PD, and PD can be made of APD or PIN.Finish the transmission of downlink optical signal.
The transmitting terminal of the optical module TRX of up direction: ONU is made of tunable laser, by the exportable light signal λ 1 that needs wavelength of control tunable laser, the light signal of identical wavelength is that λ 1 outputs to AAWG2 by synthetic one road wavelength of power combiner S1, wavelength is λ 2 ... the light signal of λ 32 passes through S2 respectively ... it is λ 2 that S32 closes Lu Chengyi road wavelength ... λ 32 outputs to AAWG2, this moment, AAWG2 finished λ 1, λ 2 ... 32 wavelength of λ 32 close ripple and become one road signal to transfer to circuit, close the road signal and be transferred to OLT side AAWG1 device through circuit, the wavelength separated of process AAWG1 device transfers to corresponding optical transceiver module PD.Finish the transmission of upward signal.
Fig. 5 is embodiments of the invention two, the network scenarios that this exemplary application is used with in big customer and little client.For 16 big customers need with a large bandwidth and at a high rate, the network of high security, just divide a wavelength to use to the big customer.Do not need so high bandwidth for 128 little clients, so just by luminous-power distributor a wavelength signals is carried out power and cut apart, 8 ONU share the bandwidth of a wavelength.Present embodiment OLT side comprises that SL, WDM assembly, array waveguide grating AAWG1 and optical module TRX form, distant-end node RN is by AAWG2 and S1 ... S32 forms, the optical module of ONU inside is the optical module of transceiver, it is colourless that transmitting terminal all adopts tunable laser to realize, receiving terminal adopts APD or PIN.C-band or L-band are respectively as service band up, downstream signal.
Down direction: SL is used for the seed light source partly held as OLT side TRX, by a WDM assembly, deliver to the FP-LD or the RSOA device of injection locking device then, make the locking of FP-LD or RSOA device export a single longitudinal mode light signal, close the road to trunk optical fiber through AAWG1 again, transfer to distant-end node RN.RN outputs to luminous-power distributor S1, S2 through the wavelength separated of AAWG2 ... S16 is then by S1 ... S16 divides 8 road to ONU side PD through power division again, and PD can be made of APD or PIN.Finish the transmission of downlink optical signal.
The transmitting terminal of the TRX optical module of up direction: ONU is made of tunable laser, by the exportable light signal λ 1 that needs wavelength of control tunable laser, the light signal of 8 identical wavelength is that λ 1 outputs to AAWG2 by synthetic one road wavelength of power combiner S1, in like manner wavelength is λ 2 ... the light signal of λ 16 passes through S2 respectively ... it is λ 2 that S16 closes Lu Chengyi road wavelength ... λ 16 outputs to AAWG2, this moment, AAWG2 finished λ 1, λ 2 ... λ 16 ... 32 road wavelength of λ 32 close ripple and become one road signal to transfer to circuit, close the road signal and be transferred to OLT side AAWG1 device through circuit, the wavelength separated of process AAWG1 device transfers to corresponding optical transceiver module PD.Finish the transmission of upward signal.
Fig. 6 is embodiments of the invention three, and this exemplary application is in the network application scene that all is little client, and each client does not need too high bandwidth, realizes that 128 users share the bandwidth resources of a wavelength.The transmitting terminal of the TRX of OLT side is made up of tunable laser or laser with fixed wavelength, and TRX receiving terminal PD is made up of PIN or APD, and AAWG1 is 32 road dielectric films or array waveguide grating is passive or active device.RN is made up of AAWG2,32 power dividers of 1: 4.The transmitting terminal of the TRX of ONU side is made up of tunable laser, and receiving terminal is made up of PIN or APD device.C-band or L-band are respectively as service band up, downstream signal.
Down direction, the light signal that the transmitting terminal tunable laser of OLT side transceiver module TRX or laser with fixed wavelength are sent a wavelength, the light signal that 32 TRX modules are sent 32 wavelength is sent to AAWG1 and closes the road, the signal that closes the road is sent to trunk optical fiber, the AAWG2 that is sent to the RN place then carries out the separate optical signals of 32 wavelength, deliver to 32 luminous-power distributor S1 then ... S32 is through delivering to each ONU place after the luminous-power distributor distribution in 1: 4, by the receiving terminal PN reception of ONU.
The transmitting terminal of the TRX optical module of up direction: ONU is made of tunable laser, by the exportable light signal λ 1 that needs wavelength of control tunable laser, the light signal of 4 identical wavelength is that λ 1 outputs to AAWG2 by synthetic one road wavelength of power combiner S1, wavelength is λ 2 ... the light signal of λ 32 passes through S2 respectively ... it is λ 2 that S32 closes Lu Chengyi road wavelength ... λ 32 outputs to AAWG2, this moment, AAWG2 finished λ 1, λ 2 ... 32 road wavelength of λ 32 close ripple and become one road signal to transfer to circuit, close the road signal and be transferred to OLT side AAWG1 device through circuit, the wavelength separated of process AAWG1 device transfers to corresponding optical transceiver module PD.Finish the transmission of upward signal.
Fig. 7 is embodiments of the invention four, the network application scene that this exemplary application is mixed in big customer and little client, for 16 big customers need with a large bandwidth and at a high rate, the network of high security, just divide a wavelength to use to the big customer.Do not need so high bandwidth for 128 little clients, so just by luminous-power distributor a wavelength signals is carried out power and cut apart, 8 little clients share the bandwidth of a wavelength.The transmitting terminal of the TRX of OLT side is made up of tunable laser or laser with fixed wavelength, and the TRX receiving terminal is made up of PIN or APD, and AAWG1 32 the tunnel periodically has heat or non-heat array wave guide grating.RN is made up of AAWG2,16 power dividers of 1: 8.The transmitting terminal of the TRX of ONU side is made up of tunable laser, and receiving terminal is made up of PIN or APD device.C-band or L-band are respectively as service band up, downstream signal.
Down direction, the light signal that the transmitting terminal tunable laser of OLT side transceiver module TRX or laser with fixed wavelength are sent a wavelength, the light signal that 32 TRX modules are sent 32 wavelength is sent to AAWG1 and closes the road, the signal that closes the road is sent to trunk optical fiber, the AAWG2 that is sent to the RN place then carries out the separate optical signals of 32 wavelength, 16 the tunnel directly give big customer ONU, other are 16 the tunnel via luminous-power distributor S1 ... S16 carries out delivering to 128 little client ONU places after 1: 8 luminous power is distributed, by the receiving terminal PN reception of ONU.
The transmitting terminal of the TRX optical module of up direction: ONU is made of tunable laser, by the exportable light signal λ 1 that needs wavelength of control tunable laser, the light signal of 8 tunnel identical wavelength is that λ 1 outputs to AAWG2 by synthetic one road wavelength of power combiner S1, wavelength is λ 2 ... the light signal of λ 16 passes through S2 respectively ... it is λ 2 that S16 closes Lu Chengyi road wavelength ... λ 16 outputs to AAWG2, finish λ 1 with remaining wavelength AAWG2, λ 2 ... λ 16 ... 32 road wavelength of λ 32 close ripple and become one road signal to transfer to circuit, close the road signal and be transferred to OLT side AAWG1 device through circuit, the wavelength separated of process AAWG1 device transfers to corresponding optical transceiver module PD.Finish the transmission of upward signal.
Among four embodiment shown in above-mentioned Fig. 4～7, AAWG is the periodicity AAWG (non-heat array wave guide grating) based on FSR, can pass through 2 simultaneously more than the wave band, its wavelength number (4,8,16,32,40 etc.) variable, (200Ghz, 100Gzh, 50Ghz etc.) are variable for channel spacing; Optical branching device is along separate routes variable than (1: 2,1: 4,1: 8,1: 16,1: 32 etc.).And tunable laser or laser with fixed wavelength service band and AAWG are complementary.
Core of the present invention is to have provided a kind of hybrid system framework of being made up of injection locking optical module or tunable laser optical module.Very high if desired bandwidth just adopts that Fiber to the home FTTH is exactly that an ONU distributes a wavelength; If what have needs high bandwidth, what have needs narrow bandwidth, adopts the system architecture of Fig. 5 or Fig. 7 again.
The above is preferred embodiment of the present invention only, is not limited to the present invention, all any modifications of being made within the present invention spirit and principle, is equal to replacement and improvement etc., all is contained within protection scope of the present invention.
Claims (3)
1. one kind based on wavelength variable hybrid optical access system, comprises the OLT part, RN part and the ONU part that connect by fibre circuit, it is characterized in that OLT partly comprises:
Some optical transceiver module TRX carry out separating of receiving terminal and transmitting terminal light signal in TRX inside by the WDM device, and receiving terminal and transmitting terminal wave band are same wave band, or are different-waveband, and up-downgoing light signal wave band is same wave band, or is different-waveband;
The transmitting terminal Tx of described OLT part optical transceiver module TRX adopts injection locking FP-LD or RSOA, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 connects seed light source SL by the WDM assembly, the output of WDM assembly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN or APD device;
Or: the transmitting terminal Tx of described OLT part optical transceiver module TRX adopts laser with fixed wavelength or wavelengthtunable laser, this moment, optical transceiver module TRX was connected to the input of the first multiplexer/demultiplexer MUX/DEMUX1 respectively, the common port of the first multiplexer/demultiplexer MUX/DEMUX1 directly connects fibre circuit, and the receiving terminal Rx of OLT part optical transceiver module TRX adopts PIN or APD device.
2. as claimed in claim 1 based on wavelength variable hybrid optical access system, it is characterized in that, described RN partly comprises: directly connect fibre circuit the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 and with the some one to one luminous-power distributor Sn of the second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 output port, n=1,2,3,
The described second Wavelength division multiplexer/demultiplexer MUX/DEMUX2 has periodic array waveguide grating, the multiplexing and demultiplexing of up, the downstream signal of finishing that wavelength and its respective channel meet,
Described luminous-power distributor Sn adopts and draws the mode of awl to constitute, and downstream signal is carried out luminous power cut apart, and upward signal is carried out power combination;
Each luminous-power distributor Sn connects several ONU.
3. as claimed in claim 2 based on wavelength variable hybrid optical access system, it is characterized in that: the transmitting terminal of ONU part adopts the wavelengthtunable laser as transmitting element, and receiving terminal PD is normally used PIN or APD,
Described ONU adopts the single fiber bi-directional structure, and the transmitting-receiving wavelength of optical signal is operated in same wave band, or is operated in different-waveband.
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| CN104301811A (en) * | 2014-08-22 | 2015-01-21 | 武汉邮电科学研究院 | Coherent passive optical network system and signal transmitting and receiving method |
| CN104301811B (en) * | 2014-08-22 | 2018-01-02 | 武汉邮电科学研究院 | The sending, receiving method of relevant passive optical network and signal |
| CN104933785A (en) * | 2015-05-13 | 2015-09-23 | 苏州海光芯创光电科技有限公司 | Entrance guard monitoring system and method of optical cable cross connection boxcabinet |
| WO2017128214A1 (en) * | 2016-01-28 | 2017-08-03 | 华为技术有限公司 | Light emission device with tunable wavelength |
| US10567085B2 (en) | 2016-01-28 | 2020-02-18 | Huawei Technologies Co., Ltd. | Wavelength tunable optical transmitter apparatus |
| CN107872288A (en) * | 2016-09-23 | 2018-04-03 | 上海诺基亚贝尔股份有限公司 | Ascending transmission method and its device in a kind of WDM PON systems |
| CN107453817A (en) * | 2017-07-10 | 2017-12-08 | 武汉邮电科学研究院 | A kind of passive optical network based on time-division and wavelength-division multiplex |
| CN113596634A (en) * | 2021-07-30 | 2021-11-02 | 武汉光迅科技股份有限公司 | Combo PON OLT monolithic integrated chip and optical assembly thereof |
| CN113596634B (en) * | 2021-07-30 | 2023-09-26 | 武汉光迅科技股份有限公司 | Combo PON OLT monolithic integrated chip and optical component thereof |
| CN114401046A (en) * | 2022-01-26 | 2022-04-26 | 武汉光迅科技股份有限公司 | Optical signal processing system and optical signal processing method |
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