CN104767585B - A kind of transceiver of optical network unit for TWDM PON systems - Google Patents
A kind of transceiver of optical network unit for TWDM PON systems Download PDFInfo
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Abstract
The invention provides a kind of transceiver of the optical network unit for TWDM PON systems, transceiver includes：Photo-coupler；Comb filter, it is coupled with photo-coupler；First optical circulator, it is coupled with comb filter；Downlink receiver, it is coupled with the first optical circulator；Second optical circulator, it is coupled with photo-coupler and the first optical circulator respectively；And light source, it is configured to modulate upstream data to uplink optical signal and exports uplink optical signal.
Description
Technical field
The present invention relates to EPON (PON), more specifically, it is related to a kind of optical-fiber network for TWDM-PON systems
The transceiver of unit.
Background technology
Time-division wavelength division multiplexed optical network (Time and Wavelength Division Multiplexed Passive
Optical Network, TWDM-PON) recently by FSAN (Full Service Access Network,
FSAN) and (ITU-T) the Q2 group selections of International Telecommunication Union's Standardization Sector as next-generation passive optical network (NGPON2) master
Want framework.Compared with other such as OFDM-PON and pure WDM-PON other candidate solutions, TWDM-PON technologies are due to it
Increased power system capacity, flexible bandwidth allocation, higher efficiency and more attract people's attention.TWDM-PON also with existing light distribution
Net (ODN) is compatible and can simply be transplanted from XGPON.
In TWDM-PON, multiple wavelength are to being stacked to increase capacity.For example, 40Gb/s TWDM-PON includes
Four pairs of wavelength.Each wavelength provides descending 10Gb/s speed and up 2.5Gb/s speed.Therefore, TWDM-PON systems
Four wavelength are to that can provide descending 40Gb/s and up 10Gb/s speed.In single wavelength channel, TWDM-PON still makes
With the descending multiplexings of XG-PON, multi-upstream access technology, time granularity etc..
Technical problem：
Need to solve multiple technical problems in TWDM-PON, it is briefly described below：
1) TWDM-PON using 40Gb/s is used as example.Due to there are four wavelength pair, each optical-fiber network list in systems
The emitter of first (ONU) needs one be tuned in four upstream wavelengths, and ONU receiver needs to be tuned to four
One in downstream wavelength.Therefore, adjustable ONU transmitter and receivers are the key technologies in TWDM-PON.However, many
Traditional adjustable ONU emitters (for example, DFB, DBR laser) and tunable receiver (for example, film filter) are quite high
Expensive.In addition, ONU transmitter and receivers are two independent elements.If the two elements are required for tuning, TWDM-
PON ONU costs will be greatly increased.
2) in TWDM-PON, due to emitter power output and receiver sensitivity limitation, downlink and uplink
Power budget be quite limited.This transfers the maximum splitting ratio of limitation, and therefore limits ONU quantity and transmission distance
From.As required by NGPON2G.989.1, TWDM-PON systems should can support at least 1: 64 splitting ratio and 40km biography
Defeated scope.Accordingly, it would be desirable to increase the splitting ratio and transmission range in following TWDM-PON systems.
3) another key issue in TWDM-PON systems is rogue's characteristic of ONU wavelength.Even if for example, ONU is correct
Ground receives one in four downstream wavelengths, and emitter can still be operated in a wrong upstream wavelength passage, and this is with regard to shadow
Ring all ONU worked in that wavelength channel.Also, because ONU launch wavelength is located in the passage of mistake, in light
Road terminal (OLT) side, the upward signal transmitted by the ONU will be exported from array waveguide grating (AWG) port of mistake, or be worked as
Even blocked during its wavelength shift AWG passband channels by AWG.
In the prior art, for the adjustable transmitter and receiver of ONU end, traditional solution uses costliness
DFB or DBR use film filter as tunable receiver as adjustable transmitter.This is two independent elements, therefore
Whole adjustable ONU cost is at a relatively 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 to aid in image intensifer at OLT ends or remote node, to amplify the power of downstream signal, thus correspondingly improve light splitting
Than/transmission range.However, this is introduced into high nonlinear crosstalk or causes ODN to turn into an active system.
The content of the invention
Therefore, the main object of the present invention is to provide a kind of inexpensive adjustable ONU transceiver.
According to the first aspect of the invention there is provided a kind of transceiver of the optical network unit for TWDM-PON systems,
The transceiver includes：Photo-coupler；Comb filter, it is coupled with the photo-coupler；First optical circulator, its with it is described
Comb filter is coupled；Downlink receiver, it is coupled with first optical circulator；Second optical circulator, its respectively with it is described
Photo-coupler and first optical circulator coupling；And light source, it is configured to modulate upstream data to uplink optical signal simultaneously
Export the uplink optical signal；Wherein, when carrying out downlink optical signal transmission, the comb filter is via the photo-coupler
Receive the downlink optical signal and filter out target downlink optical signal, the target downlink optical signal is via first optical circulator
It is output to the downlink receiver；When carrying out the uplink optical signal transmission, the uplink optical signal is via described second
Optical circulator and first optical circulator are transferred to the comb filter, and the comb filter receives the descending light
Signal simultaneously filters out target uplink optical signal to the photo-coupler, and the target uplink optical signal is shunted to by the photo-coupler
First uplink optical signal and the second uplink optical signal, wherein, first uplink optical signal is transferred to optical line terminal, described
Second uplink optical signal is fed back to the light source via second optical circulator, so that the light source is based on described second
Traveling optical signal adjusts the uplink optical signal.
Include the optical network unit of above-mentioned transceiver there is provided a kind of according to the second aspect of the invention.
It is different from the existing scheme with independent adjustable ONU transmitter and receivers, it is in the present invention, adjustable to receive
Machine and emitter have shared identical optical element (such as comb filter) to realize colourless optical network unit, therefore adjustable ONU
Cost be significantly reduced.
By using comb filter, the framework of the adjustable ONU transceivers proposed can be while implement downstream wavelength choosing
Select and produced with upstream wavelength.Can neatly it be realized pair by the transmission crest (spectral response) of the shared comb filter of regulation
The wavelength tuning of downlink and uplink optical signal.
In the present invention, upstream wavelength automatically becomes the function of downstream wavelength.Once downstream wavelength is chosen, then accordingly
Upstream wavelength also will automatically be produced, and therefore simply solve rogue's characteristic of ONU wavelength.
In addition, in the present invention, in order to realize downstream wavelength selection and upstream wavelength tuning, it is not necessary in very big scope
Upper scan transfer crest is to cover whole wavelength channels.Alternatively, the transmission of small amount is only needed for tunable optical filter
Crest is offset, and this will be realized to the rapidly wavelength tunings of ONU transceivers.
Preferably, traditional inexpensive Fabry Perot type laser diode (FP-LD) or reflective semiconductor amplification
Device (RSOA) is used as light source, and the upward signal of Wavelength tunable is produced to form backfeed loop.
Preferably, two-way amplifier is used in invention, its equally by it is descending and it is descending it is shared with thermal compensation signal loss with
Increase linkage length.Therefore, it is possible to correspondingly increase the quantity (or splitting ratio) of transmission range and ONU.
In brief, compared with currently existing scheme, it is used for simultaneously present invention uses single adjustable comb filter
Produce upstream wavelength and the selection to downstream wavelength.In addition, the present invention solves rogue's characteristic of ONU wavelength, used it is low into
This FP-LD or RSOA, and the transmission range under FP-LD and RSOA service conditions is improved simultaneously.Also, can in the present invention
To carry out rapidly wavelength tuning middle in a big way.Further, the present invention is adapted to the TWDM- of following high power capacity
PON system.
Various aspects of the invention will be become apparent from by the explanation of embodiment in detail below.
Brief description of the drawings
, will be more preferably geographical after the description below with reference to the embodiment of the invention given by drawings below
Solution is of the invention, and other objects of the present invention, details, feature and advantage will become apparent.In the accompanying drawings：
Fig. 1 shows the schematic diagram of the adjustable ONU transceivers according to one embodiment of the present of invention；
Fig. 2 shows that the adjustable ONU transceivers according to one embodiment of the present of invention carry out the signal of downstream wavelength selection
Figure；
Fig. 3 shows that the adjustable ONU transceivers according to one embodiment of the present of invention carry out the signal of upstream wavelength generation
Figure；
Fig. 4 shows the fortune of the comb filter with larger Free Spectral Range according to one embodiment of the present of invention
Make schematic diagram；
Fig. 5 shows the comb filter having compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention
Operate schematic diagram；And
Fig. 6 is shown according to an alternative embodiment of the invention, and there is the comb filter compared with freedom in minor affairs spectral region to carry out
The schematic diagram of wavelength selection.
In figure, through different diagrams, same or similar reference represents identical or corresponding part or spy
Levy.
Embodiment
Fig. 1 shows the schematic diagram of the adjustable ONU transceivers according to one embodiment of the present of invention.ONU transmitting-receivings that this is adjustable
Machine 1 includes photo-coupler 10, two-way amplifier 11 (such as SOA), comb filter 12, two optical circulator (the first ring of light rows
The optical circulator 14 of device 13 and second), light source 15 and downlink receiver 16.Preferably, FP-LD or RSOA can be used as light
Source.In one embodiment of the invention, photo-coupler is set to 80: 20.It should be appreciated that in practical operation, depending on
Parameter in structure, aforementioned proportion can be changed to other values (such as 90: 10).
In this scenario, adjustable ONU transmitter and receivers pass through shared identical two-way amplifier 11 and comb filtering
Device 12 and it is interrelated, and therefore greatly save ONU cost.Upstream wavelength is produced by backfeed loop, this feeds back to
Road includes photo-coupler 10, two-way amplifier 11, comb filter 12, the first optical circulator 13 and the second optical circulator 14 and light
Source 15.In downlink transfer, downlink optical signal amplified first by two-way amplifier 11 with increase link transmission scope and then
Target downlink optical signal is filtered out by the selection of comb filter 12.Selected target downlink optical signal is then via the first ring of light row
Device 13 is output to downlink receiver 16.Here, downstream wavelength selection and upstream wavelength tuning can be by tuning single comb
Shape wave filter 12 and realized simultaneously.
The implementation of proposed tuning ONU transceivers is discussed further below.
Fig. 2 shows that the adjustable ONU transceivers according to one embodiment of the present of invention carry out the signal of downstream wavelength selection
Figure.The transmission direction of downlink optical signal is denoted in Fig. 2 with dotted line.As shown in Fig. 2 when carrying out downlink optical signal transmission, coming
80% end of photo-coupler 10 is initially injected from the downlink optical signal with such as four downstream wavelengths of optical line terminal
Mouthful, and then it is introduced into two-way amplifier 11 via photo-coupler 10.Thus, light is punished with remote node in transmitting procedure
The power loss brought can be compensated to a certain extent.Thus, it is possible to support longer transmission range and more ONU.When
So, in some alternative embodiments, two-way amplifier 11 can also be saved.By the transmission wave for tuning comb filter 12
Peak, so that its alignment target downstream wavelength, can select target downlink optical signal, and will input the of the first optical circulator 13
Single port a.Hereafter, target downlink optical signal is by the second port b outputs from the first optical circulator 13, and will be transferred to descending
Receiver 16 for target downlink optical signal detection.
Fig. 3 shows that the adjustable ONU transceivers according to one embodiment of the present of invention carry out the signal of upstream wavelength generation
Figure.The transmission direction of uplink optical signal is denoted in Fig. 3 with dotted line.As shown in figure 3, in uplink direction, comb filter
12 are utilized to produce target upstream wavelength again, and therefore downstream wavelength filtering is identical by shared one with upstream wavelength generation
Tunable filter, to realize the inexpensive ONU transceivers in TWDM-PON.Required according to NGPON2PMD, downlink and uplink
Wavelength is dispensed on different wave bands.ONU transceivers according to the present invention can fully achieve the requirement, because comb filter
There is periodic spectral response in wider wavelength region (such as C-band and L-band).As shown in figure 3, including optocoupler
Clutch 10, two-way amplifier 11, comb filter 12, the feedback of the first optical circulator 13 and the second optical circulator 14 and light source 15
Generation target upstream wavelength in loop.For the process that exemplary upstream wavelength is produced, in an embodiment of the invention
It is middle to use FP-LD as light source.
First, the uplink optical signal of many longitudinal modes is produced by FP-LD, and it is in the counterclockwise direction via the second optical circulator
14 are injected into backfeed loop.The signal is transmitted to the 3rd port c of the first optical circulator 13 and by the first optical circulator 13
First port a is exported.Therefore, the uplink optical signal that many longitudinal modes are produced by FP-LD is passed into feedback by two optical circulators
In loop.
Hereafter, filtered using comb filter 12 from the uplink optical signal of many longitudinal modes and select the up light letter of target
Number.Selected target uplink optical signal (single mode uplink optical signal) is transferred in two-way amplifier 11 with compensation feedback loop
In loss.Amplified target uplink optical signal is then transferred in photo-coupler 10.Here, photo-coupler 10 will be through putting
Big target uplink optical signal is shunted to the first uplink optical signal and the second uplink optical signal.Here, the first uplink optical signal
The power that power accounts for target uplink optical signal is more than the power of the second uplink optical signal and accounts for the power of target uplink optical signal.As above
It is described, the ratio of photo-coupler is set to 80: 20 herein.That is, the first uplink optical signal (accounts for the power of target uplink optical signal
80%) it is used as finally will be transmitted to the uplink optical signal of optical line terminal, and export from backfeed loop to optical line terminal.And
Other remaining second uplink optical signal (power 20% for accounting for target uplink optical signal) is fed back via the second optical circulator 14
Return FP-LD.By the way that target single mode uplink optical signal fed back into FP-LD, FP-LD output wavelength will be locked to selected
Target upstream wavelength and other pattern will be suppressed.Hereafter, target upstream wavelength will again be exported from FP-LD, and then
Enter backfeed loop again.
Preferably, depending on required precision, above-mentioned feedback procedure will implement the spectrum-stable until uplink optical signal
Into the spectrum of target uplink optical signal.
Therefore, feedback fraction (20% part i.e. in figure) in summary, in selected single mode uplink optical signal will
It is transmitted by following light paths：13 → the comb filter of optical circulator 12 of FP-LD15 → second optical circulator 14 → the first
11 → photo-coupler of → two-way amplifier 10 → the second, 14 → FP-LD15 of optical circulator.Said process is in the feedback loop always
Carry out until producing stable single mode uplink optical signal (i.e. target uplink optical signal).In addition, data modulation can be loaded into
FP-LD or RSOA.The front end of photo-coupler 10 can also use an extra FP-LD to support the speed until 10Gb/s
High speed data modulations.
In the present invention, once downstream wavelength is selected by comb filter, then corresponding upstream wavelength also will be by automatically
It is selected, and therefore, it is possible to effectively remove ONU wavelength rogue's characteristics.In practice, downlink and uplink wavelength can be allocated
To different wave bands (for example, C-band and L-band).And this will influence the design of comb filter.Comb filter is given below
Two implementation situations.Different wave bands are schematically shown with wave band A and wave band B in figures 4 and 5.
Fig. 4 shows the fortune of the comb filter with larger Free Spectral Range according to one embodiment of the present of invention
Make schematic diagram.As shown in figure 4, the Free Spectral Range of comb filter is sufficiently large, to cover the wave band of uplink and downlink.This can
To be realized by using film filter.Cause transmission crest and target downlink by tuning the transmission spectrum of comb filter
Wavelength is (for example, λ1d) it is directed at and will now cause simultaneously that one in the uplink optical signal of FP-LD many longitudinal modes is filtered with pectination
Another transmission crest alignment of ripple device, corresponding target downlink wavelength can be produced simultaneously (for example, λ1d) and target upgoing wave
Length is (for example, λ1u).Can by continuously tuned in four uplink/downlink wave-length coverages the transmission crest of comb filter come
Realize wavelength tuning.
Fig. 5 shows the comb filter having compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention
Operate schematic diagram.In the case where comb filter has less Free Spectral Range, exist in uplink and downlink wave band
Multiple transmission crests.At this time, it may be necessary to which Free Spectral Range is configured to different between the wavelength between uplink/downlink wavelength channel
Every, so that a downstream wavelength and a upstream wavelength are only will filter out, and now other wavelength and transmission crest misalignment.
If for example, each wavelength channel in downlink optical signal at intervals of 100GHz, the Free Spectral Range of comb filter
105GHz can be for example selected as.This will ensure the single mode of upstream wavelength according to Vernier effects.In this case, only
Less wavelength tuning is needed to be tuned on downlink and uplink wave band (such as 100GHz downstream wavelength interchannel
Every, it is only necessary to the tuning range less than 100GHz).
Fig. 5 shows the comb filter having compared with freedom in minor affairs spectral region according to an alternative embodiment of the invention
Operate schematic diagram.As shown in figure 5, herein by slightly moving the spectral response of comb filter by λ2d andλ2uSelect be
Target downlink and target upstream wavelength.Therefore, this wait for realizing quick wavelength tuning and reducing the ONU during tuning
Time.
Present disclose provides following advantages：
1. produced for downstream wavelength filtering and upstream wavelength and have selected shared comb filter, thus, it is possible to solve ONU
Wavelength rogue characteristic and reduce ONU costs.
2. good wavelength tuning ability.The wavelength of downlink optical signal and the up single mode optical signal produced can be continuous
Ground tunes to cover all wavelength required by TWDM-PON.Can simply it be realized flexibly by tuning comb filter
Wavelength tuning.
3. the high speed wavelength tuning capability in the whole wave-length coverage in TWDM-PON.During reducing wavelength tuning
ONU stand-by period.
4. add link load ability and thereby increase the coverage of downlink optical signal and uplink optical signal.Cause
This, improves light splitting rate and ONU quantity.
5. use lower-cost FP-LD or RSOA to be transported as light source and the laser system that makes it with single longitudinal mode
Make.
6. simplify controlling and reducing the interacting message number of times between the OLT and ONU during wavelength configuration for TC.
7. good transplantability.Easily it is extended to support multiple wavelength channels (being greater than 4) to increase system to hold
Amount.
The above description of the disclosure is used to enable any those of ordinary skill of this area to realize or using the present invention.It is right
For those of ordinary skill in the art, the various modifications of the disclosure will be apparent from, and generality defined herein
Principle can also be applied to other deformations in the case of without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention simultaneously
Example as described herein and design are not limited to, but it is consistent with the widest scope of principle disclosed herein and novel features.
Claims (9)
1. a kind of transceiver of optical network unit for TWDM-PON systems, the transceiver includes：
Photo-coupler；
Comb filter, it is coupled with the photo-coupler；
First optical circulator, it is coupled with the comb filter；
Downlink receiver, it is coupled with first optical circulator；
Second optical circulator, it is coupled with the photo-coupler and first optical circulator respectively；And
Light source, it is configured to modulate upstream data to uplink optical signal and exports the uplink optical signal；
Wherein, when carrying out downlink optical signal transmission, the comb filter receives the descending light via the photo-coupler
Signal simultaneously filters out target downlink optical signal, the target downlink optical signal via first optical circulator be output to it is described under
Row receiver；
When carrying out the uplink optical signal transmission, the uplink optical signal is via second optical circulator and first light
Circulator is transferred to the comb filter, and the comb filter receives the downlink optical signal and to the photo-coupler
Target uplink optical signal is filtered out, the target uplink optical signal is shunted to the first uplink optical signal and second by the photo-coupler
Uplink optical signal, wherein, first uplink optical signal is transferred to optical line terminal, and second uplink optical signal is via institute
State the second optical circulator and be fed back to the light source, so that the light source is adjusted on described based on second uplink optical signal
Traveling optical signal.
2. transceiver according to claim 1, it is characterised in that between the photo-coupler and the comb filter
Two-way amplifier is coupled with, it is used to amplify the downlink optical signal when carrying out the downlink optical signal transmission, and is used for
Amplify the target uplink optical signal when carrying out the uplink optical signal transmission.
3. transceiver according to claim 1, it is characterised in that the power of first uplink optical signal accounts for the target
The power of uplink optical signal accounts for the power of the target uplink optical signal more than the power of second uplink optical signal.
4. transceiver according to claim 3, it is characterised in that the power of first uplink optical signal accounts for the target
The 80% of the power of uplink optical signal, and the power of second uplink optical signal accounts for the power of the target uplink optical signal
20%.
5. transceiver according to claim 1, it is characterised in that the light source is configured as being based on the described second up light
Signal adjusts the uplink optical signal, until light of the spectrum-stable of the uplink optical signal into the target uplink optical signal
Spectrum.
6. transceiver according to claim 1, it is characterised in that the light source includes Fabry Perot type laser diode
Or reflective semiconductor amplifier.
7. transceiver according to claim 1, it is characterised in that the Free Spectral Range of the comb filter is configured
To cover the wave band of uplink and downlink.
8. transceiver according to claim 1, it is characterised in that the Free Spectral Range of the comb filter is configured
For different from the wavelength interval between uplink/downlink wavelength channel.
9. a kind of optical network unit, it includes transceiver according to any one of claim 1 to 7.
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| CN106792281B (en) * | 2015-11-20 | 2019-09-24 | 上海诺基亚贝尔股份有限公司 | Optical line terminal and optical network unit |
| CN106921440A (en) * | 2015-12-28 | 2017-07-04 | 上海贝尔股份有限公司 | A kind of inexpensive light adjustable transmitter for optical network unit |
| CN106330360B (en) * | 2016-08-30 | 2019-01-22 | 武汉光迅科技股份有限公司 | A kind of optical channel detection device and its method |
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| CN101729146A (en) * | 2009-12-17 | 2010-06-09 | 上海交通大学 | Self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network |
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| US20100322624A1 (en) * | 2008-08-22 | 2010-12-23 | National Taiwan University Of Science And Technology | Bidirectional transmission network apparatus based on tunable rare-earth-doped fiber laser |
| JP5343722B2 (en) * | 2009-06-15 | 2013-11-13 | 富士通株式会社 | Optical amplifier and polarization dependent gain suppression method for optical amplifier |
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|---|---|---|---|---|
| CN101145854A (en) * | 2007-03-15 | 2008-03-19 | 中兴通讯股份有限公司 | A device for optical amplification for single fiber bidirectional WDM system |
| CN101729146A (en) * | 2009-12-17 | 2010-06-09 | 上海交通大学 | Self-excitation multi-wavelength dynamically dispatched optical network unit in passive optical network |
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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. |