CN104767585A - Optical network unit transceiver for TWDM-PON (Time and Wavelength Division Multiplexed Passive Optical Network) system - Google Patents
Optical network unit transceiver for TWDM-PON (Time and Wavelength Division Multiplexed Passive Optical Network) system Download PDFInfo
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Abstract
The invention provides an optical network unit transceiver for a TWDM-PON (Time and Wavelength Division Multiplexed Passive Optical Network) system. The transceiver comprises an optical coupler, a comb filter coupled with the optical coupler, a first optical circulator coupled with the comb filter, an downlink receiver coupled with the first optical circulator, a second optical circulator coupled with the optical coupler and the first optical circulator respectively, and an optical source configured to modulate uplink data into uplink optical signals and output the uplink optical signals.
Description
Technical field
The present invention relates to EPON (PON), more specifically, relate to a kind of transceiver of the optical network unit for TWDM-PON system.
Background technology
Time-division wavelength division multiplexed optical network (Time and Wavelength Division MultiplexedPassive Optical Network, TWDM-PON) recently by FSAN (FullService Access Network, FSAN) and standardization department of International Telecommunication Union (ITU-T) the Q2 group selection main frame as next-generation passive optical network (NGPON2).Compare with other candidate solutions of pure WDM-PON with other such as OFDM-PON, the power system capacity that TWDM-PON technology increases due to it, flexibly allocated bandwidth, higher efficiency and more attracting people's attention.TWDM-PON is also compatible with existing optical distribution (ODN) and can transplant simply from XGPON.
In TWDM-PON, multiple wavelength increases capacity to being stacked.Such as, the TWDM-PON of 40Gb/s comprises four pairs of wavelength.Each wavelength provides the speed of the speed of descending 10Gb/s and up 2.5Gb/s.Therefore, four wavelength of TWDM-PON system are to the speed that can provide descending 40Gb/s and up 10Gb/s.In single wavelength channel, TWDM-PON still uses XG-PON descending multiplexing, multi-upstream access technology, time granularity etc.
Technical problem:
Need to solve multiple technical problem in TWDM-PON, below brief description carried out to it:
1) with the TWDM-PON of 40Gb/s exemplarily.Owing to there are four wavelength pair in systems in which, the transmitter of each optical network unit (ONU) needs to be tuned in four up wavelength, and the receiver of ONU needs to be tuned in four downstream wavelength.Therefore, adjustable ONU transmitter and receiver is the key technology in TWDM-PON.But many traditional adjustable ONU transmitters (such as, DFB, DBR laser) and tunable receiver (such as, film filter) are quite expensive.In addition, ONU transmitter and receiver is two independently elements.If these two elements all need tuning, then the ONU cost of TWDM-PON will increase greatly.
2) in TWDM-PON, due to the restriction of the power output of transmitter and the sensitivity of receiver, descending and up power budget is quite limited.This then maximum splitting ratio will be limited, and therefore limit quantity and the transmission range of ONU.Required by NGPON2G.989.1, TWDM-PON system should support the splitting ratio of at least 1: 64 and the transmission range of 40km.Therefore, need to increase the splitting ratio in following TWDM-PON system and transmission range.
3) another key issue in TWDM-PON system is rogue's characteristic of ONU wavelength.Such as, even if ONU correctly receives one in four downstream wavelength, transmitter still can be operated in a wrong upgoing wave long-channel, and this just affects all ONU worked in that wavelength channel.And, emission wavelength due to ONU is arranged in the passage of mistake, in optical line terminal (OLT) side, array waveguide grating (AWG) port from mistake exports by the upward signal transmitted by this ONU, or is even blocked by AWG when the passband channels of its wavelength shift AWG.
In the prior art, for adjustable transmitter capable and the receiver of ONU end, traditional solution uses expensive DFB or DBR as adjustable transmitter capable, and uses film filter as tunable receiver.This is two independently elements, and therefore the cost of whole adjustable ONU is quite high.
In addition, in the prior art, in order to increase the power budget of link and therefore increase splitting ratio and transmission range, need fill-in light amplifier at OLT end or remote node place, to amplify the power of downstream signal, correspondingly improve splitting ratio/transmission range thus.But this will introduce high nonlinear crosstalk or make ODN become an active system.
Summary of the invention
Therefore, main purpose of the present invention is to provide the transceiver of a kind of adjustable ONU of low cost.
According to a first aspect of the invention, provide a kind of transceiver of the optical network unit for TWDM-PON system, described transceiver comprises: optical coupler, comb filter, it is coupled with described optical coupler, first optical circulator, it is coupled with described comb filter, downlink receiver, it is coupled with described first optical circulator, second optical circulator, it is coupled with described optical coupler and described first optical circulator respectively, and light source, it is configured upstream data is modulated to uplink optical signal and exports described uplink optical signal, wherein, when carrying out downlink optical signal transmission, described comb filter receives described downlink optical signal via described optical coupler and leaches target downlink light signal, and described target downlink light signal is output to described downlink receiver via described first optical circulator, when carrying out the transmission of described uplink optical signal, described uplink optical signal is transferred to described comb filter via described second optical circulator and described first optical circulator, described comb filter receives described downlink optical signal and leaches target uplink optical signal to described optical coupler, described target uplink optical signal is shunted to the first uplink optical signal and the second uplink optical signal by described optical coupler, wherein, described first uplink optical signal is transferred to optical line terminal, described second uplink optical signal is fed back to described light source via described second optical circulator, so that described light source regulates described uplink optical signal based on described second uplink optical signal.
According to a second aspect of the invention, a kind of optical network unit comprising above-mentioned transceiver is provided.
Different from the existing scheme with independently adjustable ONU transmitter and receiver, in the present invention, tunable receiver and transmitter have shared identical optical element (such as comb filter) to realize non-colored light network element, and therefore the cost of adjustable ONU is significantly reduced.
By using comb filter, the framework of the adjustable ONU transceiver proposed can be implemented downstream wavelength simultaneously and select and the generation of up wavelength.The wavelength tuning that can realize descending and uplink optical signal neatly by regulating the transmission crest (spectral response) of shared comb filter.
In the present invention, up wavelength automatically becomes the function of downstream wavelength.Once downstream wavelength is selected, then corresponding up wavelength also will be produced automatically, and therefore solves rogue's characteristic of ONU wavelength simply.
In addition, in the present invention, selecting and up wavelength tuning to realize downstream wavelength, not need in very large scope scan transfer crest to cover whole wavelength channels.Alternatively, only need transmission crest very in a small amount to offset for tunable optical filter, this will realize the wavelength tuning rapidly to ONU transceiver.
Preferably, Fabry Perot type laser diode (FP-LD) or the reflective semiconductor amplifier (RSOA) of traditional low cost are used as light source, to form feedback loop to produce the upward signal of Wavelength tunable.
Preferably, in invention, use two-way amplifier, it is shared with compensating signal loss by descending and descending and increase linkage length equally.Therefore, it is possible to correspondingly increase the quantity (or splitting ratio) of transmission range and ONU.
In brief, compared with existing scheme, present invention uses single adjustable comb filter for producing up wavelength and the selection to downstream wavelength simultaneously.In addition, the invention solves rogue's characteristic of ONU wavelength, employ FP-LD or RSOA of low cost, and improve the transmission range under FP-LD and RSOA service condition simultaneously.Further, in the present invention, wavelength tuning rapidly can be carried out in a big way.Further, the present invention can be adapted to the TWDM-PON system of following high power capacity.
Various aspects of the present invention are more clear by the explanation by specific embodiment hereinafter.
Accompanying drawing explanation
After the description below with reference to the specific embodiment of the present invention given by following accompanying drawing, the present invention will be understood better, and other objects of the present invention, details, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 shows the schematic diagram of the adjustable ONU transceiver according to one embodiment of the present of invention;
Fig. 2 adjustable ONU transceiver shown according to one embodiment of the present of invention carries out the schematic diagram of downstream wavelength selection;
Fig. 3 adjustable ONU transceiver shown according to one embodiment of the present of invention carries out the schematic diagram of up wavelength generation;
Fig. 4 shows the running schematic diagram with the comb filter of larger Free Spectral Range according to one embodiment of the present of invention;
Fig. 5 shows the running schematic diagram with the comb filter compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention; And
Fig. 6 shows has according to an alternative embodiment of the invention the schematic diagram carrying out wavelength chooses compared with the comb filter of freedom in minor affairs spectral region.
In the drawings, run through different diagrams, same or similar Reference numeral represents identical or corresponding parts or feature.
Embodiment
Fig. 1 shows the schematic diagram of the adjustable ONU transceiver according to one embodiment of the present of invention.This is adjustable, and ONU transceiver 1 comprises optical coupler 10, two-way amplifier 11 (such as SOA), comb filter 12, two optical circulators (first optical circulator 13 and the second optical circulator 14), light source 15 and downlink receiver 16.Preferably, FP-LD or RSOA can be used as light source.In one embodiment of the invention, optical coupler is set to 80: 20.Should be appreciated that in practical operation, depend on the parameter in structure, aforementioned proportion can change to other values (such as 90: 10 etc.).
In this scenario, adjustable ONU transmitter and receiver is interrelated by shared identical two-way amplifier 11 and comb filter 12, and has therefore greatly saved the cost of ONU.Produce up wavelength by feedback loop, this feedback loop comprises optical coupler 10, two-way amplifier 11, comb filter 12, first optical circulator 13 and the second optical circulator 14 and light source 15.When downlink transfer, first downlink optical signal is amplified to increase link transmission scope by two-way amplifier 11 and is selected to leach target downlink light signal by comb filter 12 subsequently.Selected target downlink light signal is output to downlink receiver 16 via the first optical circulator 13 subsequently.At this, downstream wavelength is selected and up wavelength tuning can be realized by tuning single comb filter 12 simultaneously.
Hereafter the implementation method of the tuning ONU transceiver proposed will be described in detail in detail.
Fig. 2 adjustable ONU transceiver shown according to one embodiment of the present of invention carries out the schematic diagram of downstream wavelength selection.Denote the transmission direction of downlink optical signal with dotted line in Fig. 2.As shown in Figure 2, when carrying out downlink optical signal transmission, first the downlink optical signal with such as four downstream wavelength from optical line terminal is injected the port of 80% of optical coupler 10, and is introduced into two-way amplifier 11 via optical coupler 10 subsequently.Thus, can be compensated to a certain extent with the power loss of remote node punishment light belt in transmitting procedure.Longer transmission range and more ONU can be supported thus.Certainly, in the embodiment that some substitute, also two-way amplifier 11 can be saved.By the transmission crest of tuning comb filter 12, to make its downstream wavelength that aims at the mark, target downlink light signal can be selected, and by the first port a of input first optical circulator 13.After this, the second port b from the first optical circulator 13 exports by target downlink light signal, and will be transferred to the detection of downlink receiver 16 for target downlink light signal.
Fig. 3 adjustable ONU transceiver shown according to one embodiment of the present of invention carries out the schematic diagram of up wavelength generation.Denote the transmission direction of uplink optical signal with dotted line in Fig. 3.As shown in Figure 3, in uplink direction, comb filter 12 is utilized to again produce target up wavelength, and therefore downstream wavelength filtering and up wavelength produce sharing an identical tunable filter, to realize the ONU transceiver of the low cost in TWDM-PON.According to NGPON2PMD requirement, descending and up wavelength is dispensed on different wave bands.This requirement can be realized completely, because comb filter has periodic spectral response in wider wavelength region may (such as C-band and L-band) according to ONU transceiver of the present invention.As shown in Figure 3, the up wavelength of generation target in the feedback loop comprising optical coupler 10, two-way amplifier 11, comb filter 12, first optical circulator 13 and the second optical circulator 14 and light source 15.In order to the process that exemplary upstream wavelength produces, use FP-LD as light source in an embodiment of the invention.
First, produced the uplink optical signal of many longitudinal modes by FP-LD, and it is injected in feedback loop via the second optical circulator 14 in the counterclockwise direction.3rd port c of this Signal transmissions to the first optical circulator 13 is also exported by the first port a of the first optical circulator 13.Therefore, the uplink optical signal being produced many longitudinal modes by FP-LD is passed in feedback loop by two optical circulators.
After this, use comb filter 12 from the uplink optical signal filtering of many longitudinal modes and select target uplink optical signal.Selected target uplink optical signal (single mode uplink optical signal) is transferred in two-way amplifier 11 with the loss in compensation feedback loop.Target uplink optical signal through amplifying is transferred in optical coupler 10 subsequently.At this, the target uplink optical signal through amplifying is shunted to the first uplink optical signal and the second uplink optical signal by optical coupler 10.At this, the power that the power that the power of the first uplink optical signal accounts for target uplink optical signal is greater than the second uplink optical signal accounts for the power of target uplink optical signal.As mentioned above, at this, ratio of optical coupler is decided to be 80: 20.Also namely, the first uplink optical signal (accounting for the power 80% of target uplink optical signal) is used as transferring to the most at last the uplink optical signal of optical line terminal, and exports from feedback loop to optical line terminal.And remaining second uplink optical signal (accounting for the power 20% of target uplink optical signal) is fed back to FP-LD via the second optical circulator 14 in addition.By target single mode uplink optical signal is fed back to FP-LD, the output wavelength of FP-LD will be locked to the up wavelength of selected target and other pattern by suppressed.After this, the up wavelength of target will export again from FP-LD, and enter feedback loop again subsequently.
Preferably, depend on required precision, above-mentioned feedback procedure will be implemented until the spectrum-stable of uplink optical signal becomes the spectrum of target uplink optical signal.
Therefore, in sum, the feedback fraction (20% part namely in figure) in selected single mode uplink optical signal will be transmitted by following light path: FP-LD15 → the second optical circulator 14 → the first optical circulator 13 → comb filter 12 → two-way amplifier 11 → optical coupler 10 → the second optical circulator 14 → FP-LD15.Said process carries out in the feedback loop until produce stable single mode uplink optical signal (i.e. target uplink optical signal) always.In addition, Data Modulation can be loaded into FP-LD or RSOA.An extra FP-LD also can be used to support for the front end of optical coupler 10 until the high speed data modulations of speed of 10Gb/s.
In the present invention, once downstream wavelength is selected by comb filter, then corresponding up wavelength also will automatically be selected, and therefore, it is possible to effectively removes ONU wavelength rogue characteristic.In practice, descending and up wavelength can be assigned to different wave bands (such as, C-band and L-band).And this will affect the design of comb filter.Implement situation for two that provide comb filter below.Different wave bands is schematically shown in figures 4 and 5 with wave band A and wave band B.
Fig. 4 shows the running schematic diagram with the comb filter of larger Free Spectral Range according to one embodiment of the present of invention.As shown in Figure 4, the Free Spectral Range of comb filter is enough large, to cover the wave band of uplink and downlink.This can realize by using film filter.Transmission crest and target downlink wavelength (such as, λ is made by the transmission spectrum of tuning comb filter
1d) aim at and now transmit crest by one that makes in the uplink optical signal of many longitudinal modes of FP-LD simultaneously with another of comb filter and aim at, corresponding target downlink wavelength (such as, λ can be produced simultaneously
1d) and the up wavelength of target (such as, λ
1u).Can by four uplink/downlink wave-length coverages continuously the transmission crest of tuning comb filter realize wavelength tuning.
Fig. 5 shows the running schematic diagram with the comb filter compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention.When comb filter has less Free Spectral Range, in uplink and downlink wave band, there is multiple transmission crest.Now, need Free Spectral Range to be configured to be different from the wavelength interval between uplink/downlink wavelength channel, thus only filtering is gone out a downstream wavelength and a up wavelength, and now other wavelength and transmission crest misalignment.Such as, if each wavelength channel in downlink optical signal be spaced apart 100GHz, then the Free Spectral Range of comb filter such as can be selected as 105GHz.This will guarantee the single mode of up wavelength according to Vernier effect.In this case, less wavelength tuning is only needed to carry out on descending and up wave band tuning (such as the downstream wavelength channel spacing of 100GHz, only needing the tuning range being less than 100GHz).
Fig. 5 shows the running schematic diagram with the comb filter compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention.As shown in Figure 5, at this by slightly moving the spectral response of comb filter by λ
2dand λ
2ube chosen as target downlink and the up wavelength of target.Therefore, wavelength tuning the stand-by period reduced at stand-by period ONU is fast this achieved.
Present disclose provides following advantage:
1., for downstream wavelength is filtered and the generation of up wavelength have selected shared comb filter, ONU wavelength rogue's characteristic can be solved thus and reduce ONU cost.
2. good wavelength tuning ability.The wavelength of the up single-mode optics signal of downlink optical signal and generation can by tuning with all wavelength covered required by TWDM-PON continuously.Wavelength tuning flexibly can be realized simply by tuning comb filter.
3. the high speed wavelength tuning capability in the whole wave-length coverage in TWDM-PON.The stand-by period of the ONU during reducing wavelength tuning.
4. add link load ability and thereby increase the coverage of downlink optical signal and uplink optical signal.Therefore, the quantity of light splitting rate and ONU is improved.
5. employing lower-cost FP-LD or RSOA as light source makes it operate with the laser system of single longitudinal mode.
6. simplify the control of TC and the interacting message number of times decreased between OLT and the ONU during wavelength configuration.
7. good transplantability.Easily be expanded to support that multiple wavelength channel (being such as greater than 4) is to increase power system capacity.
Above description of the present disclosure is for enabling any those of ordinary skill of this area realize or use the present invention.To those skilled in the art, various amendment of the present disclosure is all apparent, and general principle defined herein also can be applied to other distortion when not departing from spirit of the present invention and protection range.Therefore, the present invention is not limited to example as herein described and design, but consistent with the widest scope of principle disclosed herein and novel features.
Claims (9)
1., for a transceiver for the optical network unit of TWDM-PON system, described transceiver comprises:
Optical coupler;
Comb filter, it is coupled with described optical coupler;
First optical circulator, it is coupled with described comb filter;
Downlink receiver, it is coupled with described first optical circulator;
Second optical circulator, it is coupled with described optical coupler and described first optical circulator respectively; And
Light source, it is configured upstream data is modulated to uplink optical signal and exports described uplink optical signal;
Wherein, when carrying out downlink optical signal transmission, described comb filter receives described downlink optical signal via described optical coupler and leaches target downlink light signal, and described target downlink light signal is output to described downlink receiver via described first optical circulator;
When carrying out the transmission of described uplink optical signal, described uplink optical signal is transferred to described comb filter via described second optical circulator and described first optical circulator, described comb filter receives described downlink optical signal and leaches target uplink optical signal to described optical coupler, described target uplink optical signal is shunted to the first uplink optical signal and the second uplink optical signal by described optical coupler, wherein, described first uplink optical signal is transferred to optical line terminal, described second uplink optical signal is fed back to described light source via described second optical circulator, so that described light source regulates described uplink optical signal based on described second uplink optical signal.
2. transceiver according to claim 1, it is characterized in that, two-way amplifier is coupled with between described optical coupler and described comb filter, it is for amplifying described downlink optical signal when carrying out the transmission of described downlink optical signal, and for amplifying described target uplink optical signal when carrying out the transmission of described uplink optical signal.
3. transceiver according to claim 1, is characterized in that, the power that the power that the power of described first uplink optical signal accounts for described target uplink optical signal is greater than described second uplink optical signal accounts for the power of described target uplink optical signal.
4. transceiver according to claim 3, is characterized in that, the power of described first uplink optical signal accounts for 80% of the power of described target uplink optical signal, and the power of described second uplink optical signal accounts for 20% of the power of described target uplink optical signal.
5. transceiver according to claim 1, is characterized in that, described light source is configured to regulate described uplink optical signal based on described second uplink optical signal, until the spectrum-stable of described uplink optical signal becomes the spectrum of described target uplink optical signal.
6. transceiver according to claim 1, is characterized in that, described light source comprises Fabry Perot type laser diode and reflective semiconductor amplifier.
7. transceiver according to claim 1, is characterized in that, the Free Spectral Range of described comb filter is configured to the wave band covering uplink and downlink.
8. transceiver according to claim 1, is characterized in that, the Free Spectral Range of described comb filter is configured to be different from the wavelength interval between uplink/downlink wavelength channel.
9. an optical network unit, it comprises transceiver according to any one of claim 1 to 7.
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Address after: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee after: Shanghai NOKIA Baer Limited by Share Ltd Address before: 201206 Shanghai, Pudong Jinqiao Ning Bridge Road, No. 388, No. Patentee before: Shanghai Alcatel-Lucent Co., Ltd. |