CN102833031B - 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 technical field of photo communication, more specifically say, relate to a kind of based on OFDMA(OFDM) Reconfigurable Optical Add/drop Multiplexer.
Background technology
In recent years, along with residential and business customer is to the continuous increase of bandwidth demand, force service provider to provide wider capacity to terminal use, make intelligent acess technology become the technology having market prospects most.As a kind of modulation system of high spectrum utilization, OFDM (OFDM) is widely used in the middle of transmission and access network.OFDM is a kind of particular frequencies multiplex technique utilizing multi-carrier modulation.The essential idea of this technology is: channel is divided into several orthogonal sub-channels, high-speed data signal is converted to parallel low speed sub data flow, is modulated to every sub-channels and transmits.
OFDMA(OFDM) by OFDM(OFDM) based on, it is OFDM and FDMA(frequency division multiple access) combination of technology, realize multiple access by the subcarrier distributing some to each user.
In OFDMA system, multiple user can carry out the transmission of data simultaneously, and can according to the quantity of the size of subscriber traffic dynamically allocation of subcarriers; Simultaneously due to the orthogonality between each subcarrier, do not need for inserting guard band between different user, and user's frequency band is overlapping mutually, drastically increases 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.Meanwhile, the modulation technique based on OFDM also has the ability of anti-optical fiber dispersion and polarization mode dispersion (PMD), and therefore, this technology receives to be paid close attention to widely and apply.
Optical add/drop multiplexer (Optical Add-Drop Multiplexer, be called for short OADM) be wavelength division multiplexing (Wavelength Division Multiplexing, be called for short WDM) one of the Primary Component of optical-fiber network, can without light/electrical/optical conversion and electric treatment, just can realize the drop and insert feature of wavelength division multiplexed channel, having signaling mode and rate transparency, is one of key technology of the electronic bottleneck problem overcoming legacy network interior joint.
Reconfigurable Optical Add/drop Multiplexer (Reconfigurable Optical Add-Drop Multiplexer, be called for short ROADM) refer to the configurable optical add/drop multiplexer of wavelength, its dynamic regulating networks node add/drop(inserts/separates) wavelength, thus reach the ability of optical-fiber network dynamic restructuring.Utilize Reconfigurable Optical Add/drop Multiplexer can increase the elasticity of wavelength division multiplexed network, make operator can the path of Remote Dynamic control wave longer transmission, effectively reduce the operation and maintenance cost of operator.
Compared with traditional wavelength-division multiplex system, based in the system of OFDM, a new concept is had to be called band (band) instead of wavelength.As a sub-wavelength units, band can overcome strict coarsegrain and is detained bandwidth bottleneck and obtains an effective traffic assignments.Therefore, realizing Reconfigurable Optical Add/drop Multiplexer is in an ofdm system exactly that add/drop(inserts/separates) corresponding frequency band, usually all realized by optical coupler/filter, the existing research about this respect has the content in following two.
One is the variable bit rate Reconfigurable Optical Add/drop Multiplexer based on light OFDM hyper channel that Alcatel Lucent Bell Laboratory proposed in 2010.This method uses continuous wave band signal based on light OFDM frequency band (Band) as the transformat of variable bit rate, and the add/drop(being realized frequency band by filter is inserted/separates).Separate at drop() in path, directly use a band pass filter extract required for frequency band, but due to the shape of ofdm signal as rectangle, except the frequency band needed, also can leach the frequency band Band that a part is adjacent.Realize add(to insert) function, first need a band stop filter will insert local frequency spectrum to remove new OFDM frequency band, and then insert new frequency band, similarly, due to filter and signal, adjacent Band can not be completely removed, and can remain some interfering signal powers.
Two is Reconfigurable Optical Add/drop Multiplexer based on the orthogonal frequency band of one multiplexing (Orthogonal Band Multiplexing is called for short OBM) the multiplexing hyper channel of single carrier frequency division that Chen Yuan Xiang team of Peking University proposed in 2011.This method add/drop(inserts/separates) be orthogonal single frequency band, band separation is 10GHz, use a Finisar Waveshaper 4000S carry out add(insert) and drop(separate) function.This waveshaper (Waveshaper) can provide good filter amplitudes to control, and has the filtering bandwidth of a minimum 10GHz.Meanwhile, waveshaper can be configured to the logical and band stop filter of the variable band of centre frequency easily.Add(inserts) function is, by waveshaper, all frequency bands are divided into two groups, wherein one group is exactly the signal needing to separate.Drop(separates) function first utilizes waveshaper to be removed by one of them frequency band, then produces a new corresponding frequency band again at low one-level link, finally this two paths of signals is combined with a coupler and just achieves add(and insert) function.The shortcoming of this method is due to the limited slope of optical filter, and add(inserts) function can produce a loss penalty to the frequency band inserted and two nearby frequency bands, and adjacent frequency is with the interval of 10GHz, reduces band efficiency.
Summary of the invention
The object of the present invention is to provide a kind of Reconfigurable Optical Add/drop Multiplexer based on OFDMA, to overcome the restriction of prior art median filter and to cause add-drop multiplexer to there is adjacent band interference and nearby frequency bands interval causes more greatly band efficiency to decline, and realize add(insert) function time, need first the frequency band of correspondence position to be removed and then insert new frequency band, the defect of some interference signals can be remained.
For achieving the above object, the present invention is based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA, it is characterized in that, comprising:
One polarization beam apparatus, for separating of multi-band ofdm signal, is divided into two-way by polarization direction, namely only includes the upgoing O FDM signal of x-polarisation direction frequency band composition and only includes the descending ofdm signal of y-polarisation direction frequency band composition;
Wherein said multi-band ofdm signal comprises multiple frequency band, comprises the subcarrier that several are mutually orthogonal in each frequency band, and the interval between frequency band equals the interval in frequency band between each subcarrier; Multiple frequency band interleaves distribution by x and y-polarisation direction, wherein the frequency band composition upgoing O FDM signal in x-polarisation direction, and the frequency band in y-polarisation direction forms descending ofdm signal;
One band pass filter, separates (extraction) out for the frequency band needed in the descending ofdm signal that separated by polarization beam apparatus, is sent to corresponding distant-end node, i.e. user;
One optical coupler, the upgoing O FDM signal that the upstream band sent for distant-end node and polarization beam apparatus separate is combined into the new upgoing O FDM signal in a road, namely upstream band is inserted frequency band and insert (add) in upgoing O FDM signal, and export to polarization beam combiner, existing band separation frequency bandwidth in described upstream band and upgoing O FDM signal, and its polarization direction is x direction;
One polarization beam combiner, the descending ofdm signal that polarization beam apparatus is separated or separate through band pass filter the new upgoing O FDM signal that the descending ofdm signal after required frequency band and optical coupler export and merge into new multi-band ofdm signal and export.
Goal of the invention of the present invention is achieved in that
The present invention is based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA, first by polarization beam apparatus, multi-band ofdm signal is divided into the upgoing O FDM signal only including x-polarisation direction frequency band composition and the descending ofdm signal only including y-polarisation direction frequency band composition, owing to comprising several mutually orthogonal subcarriers in frequency band each in multi-band ofdm signal, interval between frequency band equals the interval in frequency band between each subcarrier, so not only ensure that the orthogonality between frequency band, also make bandwidth obtain to utilize fully, improve band efficiency.Then, the up-downgoing ofdm signal separated realizes inserting (add) and separating (drop) function respectively by optical coupler and band pass filter, and existing band separation frequency bandwidth in the upstream band and the upgoing O FDM signal that insert, finally by polarization beam combiner by descending ofdm signal and the new multi-band ofdm signal output of new upgoing O FDM signal syntheses.Owing to realizing respectively separating (drop) and (add) function on two polarization direction x and y, and multi-band ofdm signal be x, the frequency band in y-polarisation direction interleaves, the band separation of the descending ofdm signal separated is the width of a frequency band, therefore, the interference that (extraction) does not have nearby frequency bands is separated to required frequency band, the requirement of filter is also just reduced.Meanwhile, be inserted into another polarization direction owing to inserting frequency band, be i.e., in the upgoing O FDM signal in x direction, do not need the frequency band of correspondence position to remove, therefore overcome the impact of interference signal.
Accompanying drawing explanation
The Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA is applied to metropolitan area/Access Network UNE system assumption diagram by Fig. 1;
Fig. 2 is structure chart and the spectrum diagram of a kind of embodiment of Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA;
Fig. 3 is structure chart and the spectrum diagram of the another kind of embodiment of Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA;
Fig. 4 is the spectrogram based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA shown in Fig. 3.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described, so that those skilled in the art understands the present invention better.Requiring particular attention 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 are described in and will be left in the basket here.
For convenience of description, first the relevant speciality term occurred in embodiment is described:
ROADM(Reconfigurable Optical Add-Drop Multiplexer): Reconfigurable Optical Add/drop Multiplexer;
Add/Drop:(inserts/separates);
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.
The Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA is applied to metropolitan area/Access Network UNE system assumption diagram by Fig. 1.
In the present embodiment, as shown in Figure 1, OFDMA single fiber ring is by a central office CO and several Centroids CN, and being three compositions in the present embodiment, is all by the Fiber connection of an one-way transmission between central office CO and Centroid CN or Centroid CN.Data flow to distant-end node RN by core net by central office, and namely the direction of user is descending DS direction, and the direction that data flow to core net by distant-end node is then up US direction.
Central office CO in OFDMA single fiber ring is directly connected with core net, is responsible for generation and the light modulation of carrying out signal, signal is published to core net.Each Centroid CN can be distributed in the optional position in ring, is responsible for the multi-band ofdm signal of carrying from core net, separates (drop) required frequency band and the upstream band from distant-end node is inserted (add) to multi-band ofdm signal.Centroid CN connects corresponding several distant-end nodes RN by OFDMA single fiber tree.
The present invention is based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA in Centroid CN.At down direction, Centroid CN will be sent to distant-end node, and namely the signal of user separates (drop), then be sent to corresponding distant-end node RN; At up direction, the upstream band that distally node RN transmits is inserted in (add) multi-band ofdm signal by Centroid CN, is then sent to central office CO, and then is transferred to core net.
In the present embodiment, the Reconfigurable Optical Add/drop Multiplexer based on OFDMA of the present invention has two kinds of execution modes, fixed allocation mode and dynamic assignment mode.
Embodiment 1
Fig. 2 is structure chart and the spectrum diagram of a kind of embodiment of Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA.
As shown in Figure 2, in the present embodiment, fixed allocation mode is adopted.The Centroid CN realizing Reconfigurable Optical Add/drop Multiplexer (ROADM) in fixed allocation situation is second Centroid CN2 in Fig. 1, and all Centroid structures are identical, at this for second Centroid CN2.So-called fixed allocation refers to each distant-end node RN only needs a certain fixing business, such as distant-end node RN1 only needs the data of frequency band Band1, distant-end node RN2 only needs the data of frequency band Band2, and the business that each distant-end node RN needs is different.In this case each Centroid CN does not need to carry all signals, frequency band distant-end node RN required for corresponding with Centroid CN2 separates (drop) at Centroid CN2 only can be sent to corresponding distant-end node RN afterwards, and Centroid CN3 can not be sent to again by OFDMA single fiber tree, by that analogy.
Multi-band ofdm signal comprises multiple frequency band, the subcarrier that several are mutually orthogonal is comprised in each frequency band, interval between frequency band equals the interval in frequency band between each subcarrier, so not only ensure that the orthogonality between frequency band, also makes bandwidth obtain and utilizes fully.Multiple frequency band interleaves distribution by x and y-polarisation direction, wherein the frequency band composition upgoing O FDM signal in x-polarisation direction, and the frequency band in y-polarisation direction forms descending ofdm signal.In the present embodiment, as shown in Fig. 2 (1), comprise three frequency bands, be respectively Band1, Band2 and Band3, three frequency bands interleave distribution by x and y-polarisation direction, ensure that making full use of bandwidth.
In the present embodiment, the multi-band ofdm signal transmitted from Centroid CN1 arrives Centroid CN2, namely after the present invention is based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA, first Polarization Controller PBS is utilized multi-band ofdm signal to be divided into x and y two polarization directions, that y-polarisation direction is carried is frequency band Band1 and the frequency band Band3 of descending ofdm signal, and that x-polarisation direction is carried is the upstream band Band2 inserting (add) from Centroid CN1.
As shown in Figure 2, to the descending ofdm signal on y-polarisation direction, use band pass filter BF by the business required for distant-end node RN2, namely frequency band band1 filters out and is transferred to distant-end node RN2.In the present embodiment, by circulator, band pass filter BF adds that an optical fiber bragg grating FBG forms, 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 of selection is returned optical fiber circulator, be transferred to distant-end node RN2 again, remaining frequency band Band3 namely through band pass filter separate the descending ofdm signal after required frequency band to be transferred to by optical fiber bragg grating FBG fiber amplifier OFA amplify and Polarization Controller PC carry out Polarization Control after continue to transmit downwards, thus achieve frequency band separate (drop) function.Because frequency band Band2 is on x-polarisation direction, y-polarisation direction only has frequency band Band1 and frequency band Band3, therefore wider interval is just had between frequency band Band1 and frequency band Band3, would not have an impact to nearby frequency bands when extracting signal with filter like this, to filter, namely the requirement of optical fiber bragg grating FBG is also lower in the present embodiment.
On x-polarisation direction, upstream band Band2 from distant-end node RN2 upstream band Band4 and distant-end node RN1 synthesizes the new upgoing O FDM signal in a road through optical coupler OC, frequency bandwidth in existing frequency band Band2 interval in upstream band Band4 and upgoing O FDM signal, amplify with process after fiber amplifier OFA amplifies and Polarization Controller PC carries out Polarization Control, the descending ofdm signal separated on the y-polarisation direction of frequency band Band1 of Polarization Control synthesizes the new multi-band ofdm signal in a road by polarization beam combiner PBC, this time-frequency band Band4 is adjacent with frequency band Band3 frequency band, formation interleaves distribution, finally this new multi-band ofdm signal is transferred to next Centroid CN3.
Embodiment 2
Fig. 3 is structure chart and the spectrum diagram of the another kind of embodiment of Reconfigurable Optical Add/drop Multiplexer that the present invention is based on OFDMA.
As shown in Figure 3, in the present embodiment, dynamic assignment mode is adopted.The Centroid CN realizing Reconfigurable Optical Add/drop Multiplexer (ROADM) in dynamic assignment situation is second Centroid CN2, and all Centroid structures are identical, at this still for second Centroid CN2.So-called dynamic assignment refers to each distant-end node RN can need arbitrary a kind of business, and a certain business is not fixing correspond to some distant-end node RN, and the distribution of business is dynamically carried out according to demand.The topmost difference of it and fixed allocation is exactly that each Centroid CN needs the signal carrying all frequency bands.
In the present embodiment, the formation of multi-band ofdm signal is identical with embodiment 1.After the multi-band ofdm signal transmitted from Centroid CN1 arrives Centroid CN2, after namely the present invention is based on the Reconfigurable Optical Add/drop Multiplexer of OFDMA, first utilize Polarization Controller PBS signal is divided into x and y two folk prescriptions to.Similarly, that y-polarisation direction is carried is frequency band Band1 and the frequency band Band3 of descending ofdm signal, and that x-polarisation direction is carried is the upstream band Band2 inserting (add) from Centroid CN1.
As shown in Figure 3, descending ofdm signal on the y-polarisation direction that Polarization Controller PBS is separated, use beam splitter OS that descending ofdm signal is divided into identical two-way, one road signal is by band pass filter BF by the business required for distant-end node RN2, and namely frequency band band1 filters out and is transferred to distant-end node RN2.In the present embodiment, by circulator, band pass filter BF adds that 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 of selection is returned optical fiber circulator, be transferred to distant-end node RN2 again, thus achieve frequency band separate (drop) function, its effect, with embodiment 1, does not repeat them here.
The multi-band ofdm signal that an other descending ofdm signal in road is combined into a road new with the new upgoing O FDM signal on x-polarisation direction after fiber amplifier OFA amplifies and Polarization Controller PC carries out Polarization Control is transferred to Centroid CN3.As different from Example 1, the downstream signal being combined into the new multi-band ofdm signal in a road with the new upgoing O FDM signal on x-polarisation direction includes all downstream bands, and like this, each Centroid CN needs the signal carrying all frequency bands.
On x-polarisation direction, on x-polarisation direction, upstream band Band2 from distant-end node RN2 upstream band Band4 and distant-end node RN1 synthesizes aforesaid new upgoing O FDM signal through optical coupler OC, and inserted mode, the effect of upstream band Band2 are identical with embodiment, repeat no more.
Scheme the second execution mode of the present invention: the simulated spectrum figure of dynamic assignment mode.
As shown in Figure 4, Fig. 4 (a) represents the multi-band ofdm signal transmitted from a upper Centroid CN1, can see from Fig. 4 (a); multi-band ofdm signal has been divided into three frequency band Band; be respectively band1, band2 and band3, be mutually orthogonal between each frequency band Band and do not protect interval.
After multi-band ofdm signal enters Centroid CN2, polarization beam apparatus PBS is utilized to split into x and y two polarization directions, descending ofdm signal on y-polarisation direction is frequency band band1 and frequency band band3, upgoing O FDM signal on x-polarisation direction is frequency band band2, as shown in Fig. 4 (b) He (d).
Frequency band band1 and band3 being through the descending ofdm signal after polarization beam apparatus PBS on y-polarisation direction shown in Fig. 4 (b), the interval between these two frequency bands is the width of frequency band band2.Descending ofdm signal beam splitter OS on y direction divide into the identical signal of two-way, one tunnel then utilizes band pass filter to be extracted by the frequency band band1 required for distant-end node RN2, as shown in Figure 4 (c), Fig. 4 (b) and (c) namely achieve the function of drop to the frequency band leached; The multi-band ofdm signal that the descending ofdm signal in another road is combined into a road new with the new upgoing O FDM signal on x-polarisation direction after fiber amplifier OFA amplifies and Polarization Controller PC carries out Polarization Control is transferred to Centroid CN3.
The frequency band band2 be through after polarization beam apparatus PBS on x-polarisation direction shown in Fig. 4 (d).X-polarisation direction is inserted and (add) the distally upstream band band4 that transmits of node RN 2, upstream band band4 is adjacent with frequency band band3, interval between them also equals the interval between subcarrier, upgoing O FDM signal after insertion is as shown in Fig. 4 (e), and Fig. 4 (d) and (e) namely achieve the function of insertion (add).
Shown in Fig. 4 (f) is signal after utilizing polarization beam combiner PBC to be combined by the signal of x and y two polarization states, can find out between each subband it is do not protect interval, take full advantage of system bandwidth.New multi-band ofdm signal after synthesis continues to transmit to next Centroid by optical fiber.
Multi-band ofdm signal is divided into x and y two polarization directions by the present invention, realize the function inserting (add) in one polarization direction, another polarization direction realizes the function separating (drop), thus completes the reconstruct of multi-band ofdm signal, achieve following beneficial effect:
(1) be mutually orthogonal between the frequency band Band of multi-band ofdm signal, interval between frequency band Band equals the interval in frequency band Band between subcarrier, namely boundary belt is not had, therefore the utilance of bandwidth is very high, frequency band simultaneously on x and y two polarization directions interleaves mutually, further increases the utilance of bandwidth;
(2) two polarization states are divided into by multi-band ofdm signal to process respectively, interval like this on each polarization direction between frequency band is wider, therefore adjacent frequency band would not be affected when extracting required frequency band with filter, reduce the performance requirement to filter, system is more easily implemented;
(3) by regulating centre frequency and the bandwidth of filter, the reconstructable OADM function of variable bit rate can be realized, adapt to multiple communicating requirement.
Although be described the illustrative embodiment of the present invention above; so that those skilled in the art understand 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 change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (4)
1. based on a Reconfigurable Optical Add/drop Multiplexer of OFDMA, it is characterized in that, comprising:
One polarization beam apparatus, for separating of multi-band ofdm signal, is divided into two-way by polarization direction, namely only includes the upgoing O FDM signal of x-polarisation direction frequency band composition and only includes the descending ofdm signal of y-polarisation direction frequency band composition;
Wherein said multi-band ofdm signal comprises multiple frequency band, comprises the subcarrier that several are mutually orthogonal in each frequency band, and the interval between frequency band equals the interval in frequency band between each subcarrier; Multiple frequency band interleaves distribution by x and y-polarisation direction, wherein the frequency band composition upgoing O FDM signal in x-polarisation direction, and the frequency band in y-polarisation direction forms descending ofdm signal;
One band pass filter, separates for the frequency band needed in the descending ofdm signal that separated by polarization beam apparatus, is sent to corresponding distant-end node, i.e. user;
One optical coupler, the upgoing O FDM signal that the upstream band sent for distant-end node and polarization beam apparatus separate is combined into the new upgoing O FDM signal in a road, namely upstream band is inserted frequency band and insert (add) in upgoing O FDM signal, and export to polarization beam combiner, existing band separation frequency bandwidth in described upstream band and upgoing O FDM signal, and its polarization direction is x direction;
One polarization beam combiner, the descending ofdm signal that polarization beam apparatus is separated or separate through band pass filter the new upgoing O FDM signal that the descending ofdm signal after required frequency band and optical coupler export and merge into new multi-band ofdm signal and export.
2. the Reconfigurable Optical Add/drop Multiplexer based on OFDMA according to claim 1, it is characterized in that, by circulator, described band pass filter adds that 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 selection is returned optical fiber circulator, be transferred to distant-end node again, namely remaining frequency band separates the descending ofdm signal after required frequency band through band pass filter and is transferred to polarization beam combiner by optical fiber bragg grating FBG.
3. the Reconfigurable Optical Add/drop Multiplexer based on OFDMA according to claim 2, it is characterized in that, also comprise a fiber amplifier and Polarization Controller, described separate the descending ofdm signal after required frequency band through band pass filter and output to fiber amplifier and amplify, then carry out being transferred to polarization beam combiner after Polarization Control through Polarization Controller.
4. the Reconfigurable Optical Add/drop Multiplexer 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-polarisation direction that Polarization Controller separates by beam splitter is divided into the descending ofdm signal of identical two-way; The one descending ofdm signal in tunnel is separated by the frequency band of band pass filter by needs, is sent to corresponding distant-end node, i.e. user; An other descending ofdm signal in road is combined into the new multi-band ofdm signal in a road with the new upgoing O FDM signal on x-polarisation direction and exports after fiber amplifier amplifies and Polarization Controller carries out Polarization Control.
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| CN105897368B (en) * | 2016-05-09 | 2018-03-20 | 长春理工大学 | The spaceborne full Optical Add/Drop Multiplexer of restructural |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101946438A (en) * | 2008-02-22 | 2011-01-12 | 日本电信电话株式会社 | Optical OFDM receiver, optical transmission system, subcarrier separation circuit, and subcarrier separation method |
| EP2312770A1 (en) * | 2009-10-13 | 2011-04-20 | Alcatel Lucent | Optical transmission method and apparatus using OFDM |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090092392A1 (en) * | 2007-10-08 | 2009-04-09 | Nec Laboratories America, Inc. | Virtual i/q multiplexing in optical code division for secure local area ofdm |
| EP2559173B1 (en) * | 2010-04-13 | 2015-09-16 | Xieon Networks S.à r.l. | Method and device for transmission and reception of a polarization multiplexed optical signal |
-
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101946438A (en) * | 2008-02-22 | 2011-01-12 | 日本电信电话株式会社 | Optical OFDM receiver, optical transmission system, subcarrier separation circuit, and subcarrier separation method |
| EP2312770A1 (en) * | 2009-10-13 | 2011-04-20 | Alcatel Lucent | Optical transmission method and apparatus using OFDM |
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| CN102833031A (en) | 2012-12-19 |
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