CN102833031A - Reconfigurable optical add-drop multiplexer on basis of OFDMA (Orthogonal Frequency Division Modulation) - Google Patents
Reconfigurable optical add-drop multiplexer on basis of OFDMA (Orthogonal Frequency Division Modulation) Download PDFInfo
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Abstract
The invention discloses a reconfigurable optical add-drop multiplexer on the basis of the OFDMA (Orthogonal Frequency Division Modulation). A multitape OFDM signal is divided into uplink and downlink OFDM signals by a polarization beam splitter and add and drop functions are respectively implemented by an optical coupler and a band-pass filter; and finally, a novel multitape OFDM signal is synthesized by a polarization beam combiner and is output. According to the multitape OFDM signal, frequency bands in an X polarization direction and frequency bands in a y polarization direction are distributed in an interleaved mode and are respectively used as the distributed uplink and downlink OFDM signals and an interval between each two frequency band is equal to an interval between each two subcarrier in each frequency band, so that the utilization rate of the frequency bands is improved; and meanwhile, the interference of the adjacent frequency bands cannot be generated to the separation (extraction) of the required frequency band, so that the requirement on the filter is also reduced. Meanwhile, the inserted frequency bands are inserted into the uplink OFDM signal in the other polarization direction, i.e. the x direction, without removing the frequency bands at the corresponding positions, and thus, the influence of interference signals is overcome.
Description
Technical field
The invention belongs to the optical communication technique field, more specifically, relate to a kind of ROADM based on OFDMA (OFDM).
Background technology
In recent years,, force the service provider wideer capacity to be provided, make the optical fiber access technology become the technology that market prospects are arranged most to the terminal use along with the continuous increase of residential and business customer to bandwidth demand.As a kind of modulation system of high spectrum utilization, OFDM (OFDM) is widely used in the middle of transmission and the access network.OFDM is a kind of particular frequencies multiplex technique that utilizes multi-carrier modulation.This technological essential idea is: channel is divided into several orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, be modulated to each subchannel and transmit.
OFDMA (OFDM) is the basis with OFDM (OFDM), and it is OFDM and technological the combining of FDMA (frequency division multiple access), distributes the subcarrier of some to realize that the multi-user inserts through giving each user.
In the OFDMA system, a plurality of users can carry out the transmission of data simultaneously, and can be according to the size of the subscriber traffic quantity of allocation of subcarriers dynamically; Simultaneously because the orthogonality between each number of sub-carrier need not be to insert the protection frequency band between different user, and user's frequency band overlaps mutually, greatly improved the availability of frequency spectrum.Orthogonality between subcarrier can also reduce inter-carrier interference (Inter-Carrier Interference; Be called for short ICI) and inter-user interference (Multi-User Interference; Be called for short MUI); And can on different subcarriers, use different modulation and coded system and transmitting power to reduce interference, increase capacity of communication system.Simultaneously, also have the ability of anti-optical fiber dispersion and polarization mode dispersion (PMD) based on the modulation technique of OFDM, therefore, this technology has received to be paid close attention to widely and uses.
Optical add/drop multiplexer (Optical Add-Drop Multiplexer; Be called for short OADM) be wavelength division multiplexing (Wavelength Division Multiplexing; Abbreviation WDM) one of Primary Component of optical-fiber network can just can be realized the drop and insert feature of wavelength division multiplexed channel without light/electricity/light conversion and electric treatment; Having signaling mode and rate transparency, is one of electronic bottleneck key of problem technology that overcomes node in the legacy network.
ROADM (Reconfigurable Optical Add-Drop Multiplexer; Abbreviation ROADM) is meant the configurable optical add/drop multiplexer of wavelength; It is the wavelength of regulating networks node add/drop (inserting/tell) dynamically, thereby reaches the ability of optical-fiber network dynamic restructuring.Utilize ROADM can increase the elasticity of wavelength division multiplexed network, make the path that operator can Remote Dynamic control wave longer transmission, reduce the operation and the maintenance cost of operator effectively.
Compare with traditional wavelength-division multiplex system, in system, have a new notion to be called band (band) rather than wavelength based on OFDM.As a sub-wavelength units, band can overcome strict coarsegrain and be detained bandwidth bottleneck and obtain an effective traffic assignments.Therefore, realize that in ofdm system ROADM is exactly add/drop (inserting/a tell) frequency band corresponding, realizes through optical coupler/filter that all existing research about this respect has the content of following two aspects usually.
The one, the variable bit rate ROADM that the Alcatel Lucent AT&T Labs proposed in 2010 based on light OFDM hyper channel.This method is to use based on the continuous wave band signal of light OFDM frequency band (Band) transformat as variable bit rate, realizes the add/drop (inserting/tell) of frequency band through filter.In drop (telling) path, directly use a band pass filter to extract needed frequency band, yet because ofdm signal as the shape of rectangle, except the frequency band of needs, also can leach the adjacent frequency band Band of a part.Realize add (insertion) function, at first need a band stop filter to remove new OFDM frequency band and will insert local frequency spectrum, and then insert new frequency band; Likewise; Because filter and signal, adjacent Band can not be removed fully, can more residual interfering signal powers.
The 2nd, the ROADM that Chen Yuan Xiang team of Peking University proposed in 2011 based on a kind of quadrature frequency band multiplexing (Orthogonal Band Multiplexing is called for short OBM) multiplexing hyper channel of single carrier frequency division.This method add/drop's (inserting/tell) is the single frequency band of quadrature, and band separation is 10GHz, uses a Finisar Waveshaper 4000S to carry out add (insertion) and drop (telling) function.This waveshaper (Waveshaper) can provide good filter amplitude control, and the filtering bandwidth of the 10GHz of a minimum is arranged.Simultaneously, waveshaper can be configured to a logical and band stop filter of band that centre frequency is variable at an easy rate.Add (insertion) function is through waveshaper all frequency bands to be divided into two groups, and wherein one group is exactly the signal that need tell.Drop (telling) function is to utilize waveshaper that one of them frequency band is removed earlier, produces a new corresponding frequency band again at low one-level link then, this two paths of signals is lumped together with a coupler just realized add (insertion) function at last.The shortcoming of this method is because the limited slope of optical filter, and add (insertions) function can be to frequency band and the loss penalty of two nearby frequency bands generations that inserts, and nearby frequency bands has the interval of 10GHz, has reduced band efficiency.
Summary of the invention
The object of the present invention is to provide a kind of ROADM based on OFDMA; Cause add-drop multiplexer to exist adjacent band interference and nearby frequency bands to cause band efficiency to descend at interval more greatly with the restriction that overcomes the prior art median filter; And when realizing add (insertion) function; Need elder generation that the frequency band of correspondence position is removed and then insert new frequency band, the defective of the more residual interference signals of meeting.
For realizing the foregoing invention purpose, the present invention is based on the ROADM of OFDMA, it is characterized in that, comprising:
One polarization beam apparatus is used to separate many band ofdm signals, by the polarization direction it is divided into two-way, promptly includes only x polarization direction frequency band upgoing O FDM signal of forming and the descending ofdm signal that includes only y polarization direction frequency band composition;
Wherein said many band ofdm signals comprise a plurality of frequency bands, comprise several mutually orthogonal subcarriers in each frequency band, and the interval between the frequency band equals the interval between each subcarrier in the frequency band; A plurality of frequency bands interleave distribution by x and y polarization direction, and wherein the frequency band of x polarization direction is formed upgoing O FDM signal, and the frequency band of y polarization direction is formed descending ofdm signal;
One band pass filter, the frequency band of the descending ofdm signal needs that are used for polarization beam apparatus is told is told (extraction) and is come out, and is sent to corresponding distant-end node, i.e. the user;
One optical coupler; Be used for upgoing O FDM signal that upstream band that distant-end node sends and polarization beam apparatus tell and be combined into one tunnel new upgoing O FDM signal; Upstream band is promptly inserted frequency band insert (add) in upgoing O FDM signal; And export to polarization beam combiner, frequency bandwidth of existing band separation in described upstream band and the upgoing O FDM signal, and its polarization direction is the x direction;
One polarization beam combiner, the descending ofdm signal that polarization beam apparatus is told or tell descending ofdm signal behind the required frequency band through band pass filter and merge into new many bands ofdm signal with the new upgoing O FDM signal of optical coupler output and export.
Goal of the invention of the present invention is achieved in that
The present invention is based on the ROADM of OFDMA; At first will be with ofdm signal to be divided into more and include only x polarization direction frequency band upgoing O FDM signal of forming and the descending ofdm signal that includes only y polarization direction frequency band composition through polarization beam apparatus; Owing to comprise several mutually orthogonal subcarriers in each frequency band in many band ofdm signals; Interval between the frequency band equals the interval between each subcarrier in the frequency band; So not only guarantee the orthogonality between the frequency band, also made bandwidth obtain utilizing fully, improved band efficiency.Then; The up-downgoing ofdm signal of telling is realized inserting (add) and telling (drop) function through optical coupler and band pass filter respectively; And frequency bandwidth of existing band separation in upstream band of inserting and the upgoing O FDM signal is exported descending ofdm signal and the new synthetic new many bands ofdm signal of upgoing O FDM signal through polarization beam combiner at last.Because (drop) and (add) function are told in realization respectively on two polarization direction x and y; And be with ofdm signal is that the frequency band of x, y polarization direction interleaves more; The band separation of the descending ofdm signal of telling is the width of a frequency band; Therefore, to the interference that (extraction) do not have nearby frequency bands of telling of required frequency band, the requirement of filter has also just been reduced.Simultaneously, be inserted into another polarization direction, promptly in the upgoing O FDM signal of x direction, need the frequency band of correspondence position do not removed, therefore overcome the influence of interference signal owing to insert frequency band.
Description of drawings
Fig. 1 is applied to metropolitan area/Access Network UNE system assumption diagram with the ROADM that the present invention is based on OFDMA;
Fig. 2 is structure chart and the spectrum diagram that the present invention is based on a kind of embodiment of ROADM of OFDMA;
Fig. 3 is structure chart and the spectrum diagram that the present invention is based on the another kind of embodiment of ROADM of OFDMA;
Fig. 4 is a spectrogram of the ROADM based on OFDMA shown in Figure 3.
Embodiment
Describe below in conjunction with the accompanying drawing specific embodiments of the invention, so that those skilled in the art understands the present invention better.What need point out especially is that in the following description, when perhaps the detailed description of known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Describe for ease, earlier the relevant speciality term that occurs in the embodiment described:
ROADM (Reconfigurable Optical Add-Drop Multiplexer): ROADM;
Add/Drop: (inserting/tell);
OFDM (Orthogonal Frequency Division Multiplexing): OFDM;
OFDMA (Orthogonal Frequency Division Multiple Access): OFDM;
PMD (Polarization Mode Dispersion): polarization mode dispersion;
WDM (Wavelength Division Multiplexing): wavelength division multiplexing;
CO (Central Office): central office;
CN (Central Node): Centroid;
RN (Remote Node): distant-end node;
SSMF (Standard Single Mode Fiber): standard single-mode fiber;
PBS (Polarization Beam Splitter): polarization beam apparatus;
PBC (Polarization Beam Combiner): polarization beam combiner;
BF (Band Filter): band pass filter;
FBG (Fiber Bragg Grating): Fiber Bragg Grating FBG;
OFA (Optical Fiber Amplifier): fiber amplifier;
PC (Polarization Controller): Polarization Controller;
OC (Optical Coupler): optical coupler;
DS (Downstream): descending;
US (Upstream): up;
OS (Optical Splitter): beam splitter;
Band: frequency band.
Fig. 1 is applied to metropolitan area/Access Network UNE system assumption diagram with the ROADM that the present invention is based on OFDMA.
In the present embodiment, as shown in Figure 1, OFDMA single fiber ring is three compositions by a central office CO and several Centroids CN in the present embodiment, all is that the optical fiber by an one-way transmission is connected between central office CO and Centroid CN or the Centroid CN.Data flow to distant-end node RN by core net through the central office, and promptly user's direction is descending DS direction, and data then are up US direction by the direction that distant-end node flows to core net.
Central office CO in the OFDMA single fiber ring directly links to each other with core net, is responsible for carrying out the generation and the light modulation of signal, and signal is published to core net.Each Centroid CN can be distributed in the optional position in the ring, is responsible for carrying the many bands ofdm signal from core net, tells (drop) required frequency band and will insert (add) to many band ofdm signals from the upstream band of distant-end node.Centroid CN connects corresponding several far-end node RN through OFDMA single fiber tree.
The ROADM that the present invention is based on OFDMA is used for Centroid CN.At down direction, Centroid CN will be sent to distant-end node, and promptly user's signal is told (drop), be sent to corresponding distant-end node RN then; At up direction, Centroid CN will insert (add) many bands ofdm signal from the upstream band that distant-end node RN transmits, and be sent to central office CO then, and then be transferred to core net.
In the present embodiment, the ROADM based on OFDMA of the present invention has two kinds of execution modes, fixed allocation mode and dynamic assignment mode.
Fig. 2 is structure chart and the spectrum diagram that the present invention is based on a kind of embodiment of ROADM of OFDMA.
As shown in Figure 2, in this execution mode, adopt the fixed allocation mode.The Centroid CN that realizes ROADM (ROADM) under the fixed allocation situation is second Centroid CN2 among Fig. 1, and all Centroid structures are identical, are example at this with second Centroid CN2.So-called fixed allocation refers to each distant-end node RN only needs a certain fixing business; The data that only need frequency band Band1 such as distant-end node RN1; Distant-end node RN2 only needs the data of frequency band Band2, and the business that each distant-end node RN needs is all different.Each Centroid CN need not carry all signals in this case; Tell (drop) back with the needed frequency band of the corresponding distant-end node RN of Centroid CN2 at Centroid CN2 and only can be sent to corresponding distant-end node RN; And can not be sent to Centroid CN3 again through OFDMA single fiber tree, by that analogy.
Many band ofdm signals comprise a plurality of frequency bands; Comprise several mutually orthogonal subcarriers in each frequency band; Interval between the frequency band equals the interval between each subcarrier in the frequency band, has so not only guaranteed the orthogonality between the frequency band, also makes bandwidth obtain utilizing fully.A plurality of frequency bands interleave distribution by x and y polarization direction, and wherein the frequency band of x polarization direction is formed upgoing O FDM signal, and the frequency band of y polarization direction is formed descending ofdm signal.In this execution mode, shown in Fig. 2 (1), comprise three frequency bands, be respectively Band1, Band2 and Band3, three frequency bands interleave distribution by x and y polarization direction, have guaranteed making full use of bandwidth.
In this execution mode; The many bands ofdm signal that transmits from Centroid CN1 arrives Centroid CN2; After promptly the present invention is based on the ROADM of OFDMA; At first utilize Polarization Controller PBS will be with ofdm signal to be divided into x and two polarization directions of y, that carry on the y polarization direction is the frequency band Band1 and the frequency band Band3 of descending ofdm signal more, and that carry on the x polarization direction is the upstream band Band2 that inserts (add) from Centroid CN1.
As shown in Figure 2, to the descending ofdm signal on the y polarization direction, use band pass filter BF with the needed business of distant-end node RN2, promptly frequency band band1 filters out and is transferred to distant-end node RN2.In this execution mode; Band pass filter BF adds that by circulator an optical fiber bragg grating FBG forms; Descending ofdm signal is input to circulator and then arrives optical fiber bragg grating FBG; By optical fiber bragg grating FBG the frequency band Band1 that selects is returned optical fiber circulator; Be transferred to distant-end node RN2 again, remaining frequency band Band3 promptly tells through band pass filter that descending ofdm signal behind the required frequency band transfers to by optical fiber bragg grating FBG that fiber amplifier OFA amplifies and Polarization Controller PC carries out the Polarization Control continued and transmits downwards, thus realized frequency band tell (drop) function.Because frequency band Band2 is on the x polarization direction; Y has only the polarization direction frequency band Band1 and frequency band Band3; Therefore between frequency band Band1 and the frequency band Band3 interval than broad is just arranged; When extracting signal with filter, just can not exert an influence to nearby frequency bands like this, to filter, be that the requirement of optical fiber bragg grating FBG is also lower in this execution mode.
On the x polarization direction; From the upstream band Band2 of distant-end node RN2 upstream band Band4 and distant-end node RN1 through the new upgoing O FDM signal of optical coupler OC synthetic a tunnel; Frequency bandwidth in existing frequency band Band2 interval in upstream band Band4 and the upgoing O FDM signal; Through fiber amplifier OFA amplify with Polarization Controller PC carry out after the Polarization Control with through amplification, descending ofdm signal on the y polarization direction of having told frequency band Band1 of Polarization Control synthesizes one tunnel new many bands ofdm signal through polarization beam combiner PBC; This time-frequency band Band4 is adjacent with frequency band Band3 frequency band; Formation interleaves distribution, and at last that this is new many bands ofdm signal is transferred to next Centroid CN3.
Fig. 3 is structure chart and the spectrum diagram that the present invention is based on the another kind of embodiment of ROADM of OFDMA.
As shown in Figure 3, in this execution mode, adopt the dynamic assignment mode.The Centroid CN that realizes ROADM (ROADM) under the dynamic assignment situation is second Centroid CN2, and all Centroid structures are identical, is example with second Centroid CN2 still at this.So-called dynamic assignment refers to each distant-end node RN can need a kind of arbitrarily business, a certain business be not fix corresponding to some distant-end node RN, professional distribution is dynamically carried out according to demand.The major different of it and fixed allocation is exactly that each Centroid CN need carry the signal of all frequency bands.
In this execution mode, be with the formation of ofdm signal identical with embodiment 1 more.After the many bands ofdm signal that transmits from Centroid CN1 arrives Centroid CN2, promptly the present invention is based on the ROADM of OFDMA after, at first utilize Polarization Controller PBS with signal be divided into x and two folk prescriptions of y to.Likewise, that carry on the y polarization direction is the frequency band Band1 and the frequency band Band3 of descending ofdm signal, and that carry on the x polarization direction is the upstream band Band2 that inserts (add) from Centroid CN1.
As shown in Figure 3; Descending ofdm signal on the y polarization direction that Polarization Controller PBS is told; Use beam splitter OS that descending ofdm signal is divided into identical two-way; With the needed business of distant-end node RN2, promptly frequency band band1 filters out and is transferred to distant-end node RN2 to one road signal through band pass filter BF.In this execution mode; Band pass filter BF adds that by circulator an optical fiber bragg grating FBG forms, and descending ofdm signal is input to circulator and then to optical fiber bragg grating FBG, by optical fiber bragg grating FBG the frequency band Band1 that selects is returned optical fiber circulator; Be transferred to distant-end node RN2 again; Thereby that has realized frequency band tells (drop) function, and its effect repeats no more at this with embodiment 1.
Other one tunnel descending ofdm signal amplifies through fiber amplifier OFA and Polarization Controller PC carry out after the Polarization Control with the x polarization direction on new upgoing O FDM signal be combined into one tunnel new many bands ofdm signal and be transferred to Centroid CN3.Different with embodiment 1 is, the downstream signal that is combined into one tunnel new many bands ofdm signal with new upgoing O FDM signal on the x polarization direction has comprised all downstream bands, and like this, each Centroid CN need carry the signal of all frequency bands.
On the x polarization direction; On the x polarization direction; Through the synthetic aforesaid new upgoing O FDM signal of optical coupler OC, the inserted mode of upstream band Band2, effect are identical with embodiment, repeat no more from the upstream band Band2 of distant-end node RN2 upstream band Band4 and distant-end node RN1.
Scheme second kind of execution mode of the present invention: the simulated spectrum figure of dynamic assignment mode.
As shown in Figure 4, Fig. 4 (a) expression can be seen from Fig. 4 (a) from many bands ofdm signal that a last Centroid CN1 transmits; Many band ofdm signals have been divided into three frequency band Band; Be respectively band1, band2 and band3 are mutually orthogonal between each frequency band Band and do not protect the interval.
After many band ofdm signals get into Centroid CN2; Utilize polarization beam apparatus PBS to be divided into x and two polarization directions of y; Descending ofdm signal on the y polarization direction is frequency band band1 and frequency band band3; Upgoing O FDM signal on the x polarization direction is frequency band band2, like Fig. 4 (b) with (d).
Shown in Fig. 4 (b) is that between these two frequency bands is the width of frequency band band2 at interval through the frequency band band1 and the band3 of the descending ofdm signal on the y polarization direction behind the polarization beam apparatus PBS.Descending ofdm signal on the y direction has been divided into two same signals with beam splitter OS; One the tunnel then utilizes band pass filter that the needed frequency band band1 of distant-end node RN2 is extracted; The frequency band that leaches shown in Fig. 4 (c), Fig. 4 (b) and (c) promptly realized the function of drop; The descending ofdm signal in another road amplifies through fiber amplifier OFA and Polarization Controller PC carry out after the Polarization Control with the x polarization direction on new upgoing O FDM signal be combined into one tunnel new many bands ofdm signal and be transferred to Centroid CN3.
Shown in Fig. 4 (d) is through the frequency band band2 on the x polarization direction behind the polarization beam apparatus PBS.On the x polarization direction, insert and (add) a upstream band band4 who transmits from distant-end node RN2; Upstream band band4 is adjacent with frequency band band3; Interval between them also equals the interval between the subcarrier; Upgoing O FDM signal after the insertion shown in Fig. 4 (e), Fig. 4 (d) and (e) promptly realized the function of insertion (add).
Shown in Fig. 4 (f) is the signal that utilizes after polarization beam combiner PBC lumps together the signal of x and two polarization states of y, can find out between each subband it is not protect at interval, has made full use of system bandwidth.New many bands ofdm signal after synthetic continues to next Centroid transmission through optical fiber.
The present invention will be with ofdm signal to be divided into x and two polarization directions of y more; On a polarization direction, realize inserting the function of (add); On another polarization direction, realize telling the function of (drop), thereby accomplish the reconstruct of many band ofdm signals, realized following beneficial effect:
(1) be mutually orthogonal between the frequency band Band of many band ofdm signals; Interval between the frequency band Band equals the interval between subcarrier in the frequency band Band; Promptly there is not boundary belt; Therefore bandwidth utilization is very high, and the frequency band on x and two polarization directions of y interleaves each other simultaneously, has further improved bandwidth utilization;
(2) will be with ofdm signal to be divided into two polarization states handles respectively more; Compare broad at the interval between the frequency band on each polarization direction like this; Therefore when extracting required frequency band, just can not influence adjacent frequency band with filter; Reduction makes system more be prone to implement to the performance requirement of filter;
(3) through regulating the centre frequency and the bandwidth of filter, can realize the reconstructable OADM function of variable bit rate, adapt to multiple communicating requirement.
Although above the illustrative embodiment of the present invention is described; So that the technical staff in present technique field understands the present invention, but should be clear, the invention is not restricted to the scope of embodiment; To those skilled in the art; As long as various variations appended claim limit and the spirit and scope of the present invention confirmed in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (4)
1. the ROADM based on OFDMA is characterized in that, comprising:
One polarization beam apparatus is used to separate many band ofdm signals, by the polarization direction it is divided into two-way, promptly includes only x polarization direction frequency band upgoing O FDM signal of forming and the descending ofdm signal that includes only y polarization direction frequency band composition;
Wherein said many band ofdm signals comprise a plurality of frequency bands, comprise several mutually orthogonal subcarriers in each frequency band, and the interval between the frequency band equals the interval between each subcarrier in the frequency band; A plurality of frequency bands interleave distribution by x and y polarization direction, and wherein the frequency band of x polarization direction is formed upgoing O FDM signal, and the frequency band of y polarization direction is formed descending ofdm signal;
One band pass filter, the frequency band of the descending ofdm signal needs that are used for polarization beam apparatus is told is told (extraction) and is come out, and is sent to corresponding distant-end node, i.e. the user;
One optical coupler; Be used for upgoing O FDM signal that upstream band that distant-end node sends and polarization beam apparatus tell and be combined into one tunnel new upgoing O FDM signal; Upstream band is promptly inserted frequency band insert (add) in upgoing O FDM signal; And export to polarization beam combiner, frequency bandwidth of existing band separation in described upstream band and the upgoing O FDM signal, and its polarization direction is the x direction;
One polarization beam combiner, the descending ofdm signal that polarization beam apparatus is told or tell descending ofdm signal behind the required frequency band through band pass filter and merge into new many bands ofdm signal with the new upgoing O FDM signal of optical coupler output and export.
2. the ROADM based on OFDMA according to claim 1; It is characterized in that; Described band pass filter adds that by circulator a Fiber Bragg Grating FBG forms; Descending ofdm signal is input to circulator and then arrives Fiber Bragg Grating FBG; By optical fiber bragg grating FBG the frequency band of selecting is returned optical fiber circulator, be transferred to distant-end node again, remaining frequency band promptly is transferred to polarization beam combiner through the descending ofdm signal that band pass filter is told behind the required frequency band by optical fiber bragg grating FBG.
3. the ROADM based on OFDMA according to claim 2; It is characterized in that; Also comprise a fiber amplifier and Polarization Controller; The descending ofdm signal that described process band pass filter is told behind the required frequency band outputs to the fiber amplifier amplification, carries out being transferred to polarization beam combiner after the Polarization Control through Polarization Controller then.
4. the ROADM based on OFDMA according to claim 1 is characterized in that, also comprises beam splitter, fiber amplifier and Polarization Controller;
Descending ofdm signal on the y polarization direction that beam splitter is told Polarization Controller is divided into the descending ofdm signal of identical two-way; One tunnel descending ofdm signal is told (extraction) through band pass filter with the frequency band of needs and is come out, and is sent to corresponding distant-end node, i.e. the user; Other one tunnel descending ofdm signal through fiber amplifier amplify with Polarization Controller carry out after the Polarization Control with the x polarization direction on new upgoing O FDM signal be combined into one tunnel new many bands ofdm signal and export.
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| WO2017088115A1 (en) * | 2015-11-25 | 2017-06-01 | 华为技术有限公司 | Reconfigurable optical add-drop multiplexer |
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| WO2017088115A1 (en) * | 2015-11-25 | 2017-06-01 | 华为技术有限公司 | Reconfigurable optical add-drop multiplexer |
| US10620376B2 (en) | 2015-11-25 | 2020-04-14 | Huawei Technologies Co., Ltd. | Reconfigurable optical add/drop multiplexer |
| US11067752B2 (en) | 2015-11-25 | 2021-07-20 | Huawei Technologies Co., Ltd. | Reconfigurable optical add/drop multiplexer |
| JP2017175521A (en) * | 2016-03-25 | 2017-09-28 | 富士通株式会社 | Wavelength multiplexed optical receiver and driving method thereof |
| CN105897368A (en) * | 2016-05-09 | 2016-08-24 | 长春理工大学 | Reconfigurable space-borne all-optical add-drop multiplexing equipment |
| CN105897368B (en) * | 2016-05-09 | 2018-03-20 | 长春理工大学 | The spaceborne full Optical Add/Drop Multiplexer of restructural |
| WO2018196605A1 (en) * | 2017-04-26 | 2018-11-01 | 华为技术有限公司 | Reconfigurable optical add-drop multiplexer |
| CN108802907A (en) * | 2017-04-26 | 2018-11-13 | 华为技术有限公司 | A kind of reconfigurable optical add/drop multiplexer |
| US10924200B2 (en) | 2017-04-26 | 2021-02-16 | Huawei Technologies Co., Ltd. | Reconfigurable optical add/drop multiplexer |
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