CN103001724B - Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer - Google Patents

Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer Download PDF

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CN103001724B
CN103001724B CN201210315301.4A CN201210315301A CN103001724B CN 103001724 B CN103001724 B CN 103001724B CN 201210315301 A CN201210315301 A CN 201210315301A CN 103001724 B CN103001724 B CN 103001724B
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photon carrier
carrier wave
optical
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photon
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CN103001724A (en
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易兴文
张静
张洪波
邓明亮
邱昆
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University of Electronic Science and Technology of China
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Abstract

The invention provides an optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and an optical add drop multiplexer. The method includes that an optical demultiplexing module demultiplexes the photonic carriers in the OOFDM signals input through optical Fourier transformation to realize photonic carrier signal separation, valid signal portions after separating are selected by an optical gate, the photonic carrier signals selected to be output are taken as downlink optical signals to be output through a downlink end, and the rest photonic carriers are taken as through photonic carriers to be input to an optical multiplexing module after optical filtering shaping. Adopting the optical Fourier transformation effectively realizes a demultiplexing function of OOFDM signal photonic carriers. The photonic carriers in the OOFDM signals are mutually orthogonal, so that the separated photonic carriers are still mutually orthogonal after being demultiplexed by adopting the OFFT technology, and other photonic carriers are unaffected after the downlink end outputs needed photonic carrier signals.

Description

The Optical Add Drop Multiplexer method of photon carrier wave and optical add/drop multiplexer in OOFDM signal
Technical field
The present invention relates to optical communication technique, particularly optical-fiber network technology.
Background technology
In more than ten years in the past, in order to the high-speed optical transmission network that constructions cost is profitable, wavelength-division multiplex technique (Wavelengthdivision multiplexing, WDM) is widely used.Along with single-channel optical transmission develops to 400G/1T, signal bandwidth (especially 1Tbps signal) will exceed existing ITU-T DWDM wavelength interval, and wavelength-division system frequency interval needs to redefine, to adapt to the transmission requirement of following single channel Tbps signal.Similar with WDM, light orthogonal frequency division multiplexi (Opticalorthogonal frequency division multiplexing, OOFDM) is also a kind of frequency domain multiplex techniques.But mutually orthogonal between OOFDM technology sub-carriers, frequency spectrum can accomplish seamless link, its availability of frequency spectrum of significant increase.Light orthogonal frequency division multiplexi is because of one of its high bandwidth utilization and the key technology having become following high speed backbone all-optical transmission.The research of current vast capacity transmission system is mostly carried out in conjunction with light OFDM and multistage modulation technique two kinds of technology.But, along with the increase of order of modulation, by the deterioration of the increase and systematic function that cause system complexity, cost.On the other hand, due to the inherent limitations of electronic device self, cause transmission rate limited.And optical signal prosessing (optical signal processing, OSP) transparent processing can be carried out to the signal of arbitrary velocity, can realize igh-speed wire-rod production line while not increasing power consumption, therefore OSP may have very large development prospect in the communication network in future.High-speed optical transmission system based on light orthogonal frequency division multiplexi has completed the checking from principle to experiment, and can realize real-time Transmission transparent, at a high speed, very likely becomes the backbone network transmission plan of following high speed full optical transmission network.
Optical add/drop multiplexer (Optical Add-Drop Multiplexer, OADM) be one of the Primary Component of wavelength division multiplexed optical network networking, a typical OADM structure as shown in Figure 1, its function is that upper and lower terminal, to realize local reception and to send some wavelength channel, does not affect the transmission of other wavelength channel simultaneously selectively from transmission light path.OADM can be used in wdm system for multiplexing and light signal that is route different wave length, by the light signal of a wavelength from " branching away " node or light signal " reeve " this node of a wavelength being transmitted, do not affect the transmission of other wavelength channel simultaneously, the interface in one network between unlike signal is provided.That is, OADM achieves traditional SDH(electricity synchronous digital hierarchy in area of light) function that completes in time domain of add-drop multiplexer, and there is the transparency, the signal of any form and speed can be processed.
In view of the important function of OADM in backbone network node and local access, domestic and international each university, company and group all expand more deep research, and strong has promoted OADM commercialization process.But existing OADM Functional Design is all carry out based on traditional WDM, constructed by various filters such as available Waveguide array, fiber gratings, and not yet shaping for the design of OADM in following high speed OOFDM optical transmission system.For 4 road photon carrier waves, Fig. 2 (a) is depicted as the spectrogram based on OOFDM technology, and Fig. 2 (b) is depicted as the spectrogram of traditional intensive multiplexed optical wave dwdm system.As seen from Figure 2, in the optical transport based on OOFDM technology, the frequency spectrum on each subcarrier is mutually orthogonal, and frequency spectrum is overlapping mutually; And have fixing guard band between signal spectrum based on dwdm system, Signal separator can be carried out by the optical filter shown in Fig. 2 (b) dotted line.Therefore, based on OOFDM technology optical transmission system due to frequency spectrum overlapping mutually, cannot be separated by light filtering.Therefore, for OOFDM optical transmission system, at optical network node place, can not adopt and traditional realize Optical Add Drop Multiplexer for the OADM in DWDM transmission system.
Summary of the invention
Technical problem to be solved by this invention is, proposes Optical Add Drop Multiplexer method and the optical add/drop multiplexer of photon carrier wave in a kind of OOFDM signal, can be used in the high-speed optical transmission network based on light orthogonal frequency division multiplexi.
The present invention for solving the problems of the technologies described above adopted technical scheme is, the Optical Add Drop Multiplexer method of photon carrier wave in OOFDM signal: Optical Demultiplexing module carries out demultiplexing by optical Fourier transform to photon carrier wave in the OOFDM light signal of input, realize photon carrier signal to be separated, the useful signal part after separation is selected through optical gate, selected the photon carrier signal exported to be exported by lower terminal as lower road light signal, all the other photon carrier waves input to light Multiplexing module as straight-through photon carrier wave after light filter shape;
The present invention adopts optical Fourier transform (Optical Fast Fourier Transform, OFFT) to have effectively achieved the demultiplexing function of OOFDM flashlight subcarrier.Further, OFFT can realize with Passive Optical Components, and support transparent transmission, energy loss is almost negligible.In addition, OFFT technology can support 4-OFFT(4 road photon carrier wave), 8-OFFT and more points number OFFT, this means that the Optical Demultiplexing method based on OFFT can realize the demultiplexing of more multichannel subcarrier.Due to mutually orthogonal between photon carrier wave in OOFDM signal, the photon carrier wave after adopting OFFT technology demultiplexing to be separated still keeps mutually orthogonal, therefore, can not affect other photon carrier wave after the photon carrier signal needed for lower terminal exports.Correspondingly, when the photon carrier wave inserted meets mutually orthogonal with straight-through photon carrier wave, recovery can be realized by light inverse Fourier transform and use.
By carrying out control treatment to the information of lower road photon carrier extract to photon carrier wave of setting out on a journey, make to set out on a journey photon carrier wave and straight-through photon carrier wave keep just giving synchronous, and photon carrier signal of setting out on a journey after treatment inputs to light Multiplexing module through upper terminal again; Each road photon carrier wave of input carries out recovering by light Multiplexing module uses rear output.Or by extracting lower road photon carrier wave as setting out on a journey photon carrier wave, after modulation, produce photon carrier signal of setting out on a journey.
The OOFDM signal that photon carrier wave and straight-through photon carrier wave synthesize a road new through light Multiplexing module of setting out on a journey exports from line output.Recovery is with pass through light inverse Fourier transform (Optical Inverse Fast Fourier Transform, OIFFT) realization, and OIFFT module can by converting the process realization of contrary with OFFT or fiber coupler realizes.
In addition, for realizing said method, the present invention also provides a kind of optical add/drop multiplexer, comprises Optical Demultiplexing module, light signal control module of setting out on a journey, light filter shape module, light Multiplexing module;
Optical Demultiplexing module is used for, by optical Fourier transform, light separation is carried out to photon carrier wave in the OOFDM signal of input, select the useful signal part of the photon carrier signal after separation, the photon carrier signal that a part exports is exported by lower terminal as lower road light signal, and all the other photon carrier waves input to light Multiplexing module as straight-through subcarrier after light filter shape;
Photon carrier Control of setting out on a journey module for, make to set out on a journey photon carrier wave and straight-through photon carrier wave keep just giving synchronous;
Light filter shape module is used for, filtering process is carried out to the straight-through photon carrier wave that Optical Demultiplexing module exports, increase the straight-through photon carrier signal useful signal time interval, compressed signal frequency spectrum, exports the straight-through photon carrier signal after filtering process to light Multiplexing module;
Light Multiplexing module is used for, and carried out recovering by set out on a journey photon carrier wave and the straight-through photon carrier wave from end of setting out on a journey and use rear output, can be realized by OIFFT module, namely the inverse of OFFT module processes or fiber coupler.
The invention has the beneficial effects as follows, adopt all-optical signal processing realization based on the Optical Add Drop Multiplexer function of OOFDM flashlight subcarrier in the vast capacity optical transport network of OOFDM technology, support transparent transmission, energy loss is almost negligible.The present invention adopts all-optical signal processing method to support high-speed optical signal to be separated and is easier to realize upwards upgrading, and can support multiple spot OFFT, thus makes new OADM design can support the Optical Add Drop Multiplexer of high-speed multiple channel light signal.
Accompanying drawing explanation
Fig. 1 is traditional OA DM schematic diagram;
Fig. 2 is the spectrum schematic diagram based on OOFDM technology and traditional WDM technology;
Fig. 3 is the OADM theory diagram in the present invention;
Fig. 4 is the Optical Transmission Network OTN schematic diagram based on OADM in the present invention;
Fig. 5 is the OOFDM exemplary system figure based on Optical Add Drop Multiplexer implementation method of the present invention.
Embodiment
OADM basic function comprises three: the wavelength channel of lower road needs, and the multiplexing signal that enters to set out on a journey, makes other wavelength channel pass through unaffected as far as possible.In OOFDM signal, every road photon carrier wave can see a wavelength-channels as.As shown in Figure 3, first input OOFDM signal carries out demultiplexing through N point optical Fourier transform (Optical FastFourier Transform, OFFT) to OADM schematic diagram of the function of the present invention, realizes photon carrier wave and is separated.Optical Demultiplexing module comprises optical Fourier transform module, optical gate; Optical Fourier transform module realizes photon carrier wave in the OOFDM signal to input by optical Fourier transform and carries out light separation; Optical gate, to through its useful signal part of optical Fourier transform demultiplexing isolated photon carrier signal gating, exports lower terminal or light filter shape module to.According to business demand, carry out the process recovery information needed such as demodulation by inputing to lower road signal receiving module behind road under the i-th road photon carrier signal.Optical gate can adopt electroabsorption modulator to realize.
The demultiplexing of N road photon carrier wave is realized through N-OFFT conversion, its useful signal time interval of photon carrier signal exported becomes original (1/N), frequency spectrum generation broadening, if isolated photon carrier wave is directly inputted into light Multiplexing module, will spectral aliasing be produced, OOFDM signal cannot be multiplexed into.Therefore, except utilizing optical gate to select useful signal part, also need to carry out the process of light filter shape to isolated photon carrier wave.Light filter shape module is for straight-through photon carrier processing, and in order to increase the useful signal time interval, compression frequency spectrum, avoids producing spectral aliasing in multiplex process.The importance of light filter shape module is to compress the video stretching after photon carrier wave separation module, reduce OADM module to the impact of straight-through photon carrier wave, be the cascade ability in order to improve this OADM scheme in essence, multiple OAMD can be together in series structure optical-fiber network.
In order to make to set out on a journey, photon carrier wave still keeps orthogonal with straight-through photon carrier wave, needs to control photon carrier wave of setting out on a journey.To photon carrier wave of setting out on a journey, frequency stabilization, phase place and Synchronization Control are carried out by the information extracting lower road photon carrier wave to the control module of photon carrier wave of setting out on a journey, or by light injection phase-locking, extracting lower road photon carrier wave as setting out on a journey photon carrier wave from the technology such as carrier extract or Wavelength reuse, after modulation, producing photon carrier signal of setting out on a journey.
Photon carrier wave of setting out on a journey after treatment can input to light inverse Fourier transform module, and generates new OOFDM signal after the straight-through photon carrier multiplexing after the process of light filter shape and exports.Due to after Optical Fiber Transmission, have certain frequency drift, under normal circumstances, frequency drift is very little, and optical filter can be tolerated.But consider in light filter shape module it is all narrow band filter, therefore, control module can carry out path length control, optimization system performance by the centre frequency of lower road photon carrier information to light filter shape module median filter extracted.
For the add drop multiplex of photon carrier wave in the OOFM signal of N road, suppose that S (t) is the light signal of multiplexing rear transmission, after discrete Fourier transform, isolate the data d of N road photon carrier wave (cycle is T) ncan be expressed as:
d n = 1 N Σ k = 0 3 S ( kT N ) exp ( j 2 π N nk ) , n = 1,2 , . . . N - - - ( 1 )
In order to realize Fourier transform in area of light, optics need be adopted, as time delay interference unit DI (delay interferometer), array waveguide grating AWG (arrayed waveguide grating) etc.Further, OFFT can adopt the delay unit of multiple different cascade system to realize multiple spot optical Fourier transform.OIFFT then can by with the processing mode of OFFT contrary or adopt the mode of fiber coupler to realize.Optical Fourier transform and common optical demultiplexer very similar, demand fulfillment formula (1) when main difference is optical Fourier transform, the channel spacing being exactly specifically the interval of photon carrier wave and optical demultiplexer is equal.
The optical add/drop multiplexer of OOFDM flashlight subcarrier in the present invention, comprises Optical Demultiplexing module, photon carrier Control of setting out on a journey module, light filter shape module, light Multiplexing module;
The present invention adopts OFFT conversion to carry out Optical Demultiplexing, realizes OOFDM flashlight subcarrier and is separated.According to business demand, from the photon carrier wave of N road, the photon carrier wave needed for exporting from lower terminal (Drop) selectively, thus the signal on a photon carrier wave " is branched away " from node; The signal branched away, through the useful signal part needed for optical gate backgating, obtains required photon carrier signal after light filter shape; Correspondingly input corresponding photon carrier wave from upper terminal (Add), and the irrelevant photon carrier wave in other and this locality together with photon carrier multiplexing of setting out on a journey after, export from the line output (Main Output) of OADM.In the present invention, first the photon carrier wave of required insertion needs to transmit after the corresponding photon carrier wave of photon carrier Control module " reeve " of setting out on a journey with the straight-through photon carrier multiplexing after light filter shape.To require in principle and straight-through photon carrier wave still keeps orthogonal for this locality photon carrier wave of setting out on a journey, to make, straight-through photon carrier wave is impregnable to be passed through.In order to realize orthogonality, accurately can control this locality photon carrier wave of setting out on a journey according to the information of this underground road photon carrier wave of the reception of extracting, comprising and photon carrier frequency is controlled and Synchronization Control.
Described Optical Demultiplexing is used for, and " is branched away " by the signal on photon carrier wave a part of in OOFDM signal from node.Owing to meeting the requirement of orthogonality between the carrier wave on each subcarrier in OOFDM signal, mutually orthogonal between each transmission light subcarrier.Therefore, the orthogonality of other several roads photon carrier wave can not be had influence in the process of separation.Realize light signal for demultiplexing in the present invention and be separated the method that have employed OFFT, photon carrier signal needed for lower road, OFFT conversion can be realized by the delay unit of cascade or array waveguide grating.Adopt OFFT conversion to carry out demultiplexing to realize OOFDM flashlight subcarrier and be separated the orthogonality can not destroyed between photon carrier wave, and transparent transmission is carried out to photon carrier signal, the interface in one network between unlike signal is provided.
Described smooth filter shape is that interval effective time of photon carrier signal reduces, and frequency spectrum generation broadening, cannot be multiplexed into OOFDM signal, therefore, needs to carry out light filter shape to isolated straight-through light letter subcarrier owing to realizing after light is separated through demultiplexing.Being exactly compress frequency spectrum from frequency, is exactly the pulse length of broadening light signal from time domain, increases interval effective time.Light filter shape reduces the impact of OADM module on straight-through photon carrier wave, improves the cascade ability of OADM module in the present invention, and multiple OAMD can be together in series structure optical-fiber network.Light filter shape module can adopt light filtering or photon carrier wave is successively realized by the method for DI unit and optical filter, and the similar RZ code of this method converts the processing method of NRZ code to.Here, DI unit class compresses a part of frequency component like a comb filter, and optical filter is in order to filtering residual frequency component.
Described reeve is used for, and light signal " reeve " this node of a carrier wave transmits, and does not affect the transmission of other photon carrier wave simultaneously.The photon carrier wave injected still needs to meet and keeps orthogonal with other several photon carrier wave, namely keeps coherence.Because lower road photon carrier wave is orthogonal with other several photon carrier wave, in order to make to set out on a journey, photon carrier wave still keeps orthogonal with straight-through photon carrier wave, can by extracting the information of lower road photon carrier wave, and in order to control to set out on a journey, photon carries wave frequency, phase place etc.Synchronously can realize with straight-through photon carrier wave by clock synchronous or OFDM symbol to the Synchronization Control of photon carrier wave of setting out on a journey synchronous, depend on the modulation system that modulation signal adopts.Photon carrier wave of setting out on a journey injects optical network node and light inverse Fourier transform module then can be adopted to realize, and due to mutually orthogonal between each photon carrier wave, the photon carrier wave of reeve can not affect the transmission of straight-through photon carrier wave.
Figure 4 shows that the Optical Transmission Network OTN schematic diagram based on OADM in the present invention, the photon carrier wave of the OOFDM signal launched adopts OADM module of the present invention to realize add drop multiplex function at network node 1 place, again the OOFDM signal of multiplexing rear output is successively through different optical network nodes, and carry out lower road according to business demand and set out on a journey, the reception of OOFDM signal is finally carried out at central station.OOFDM transmitter, in order to produce OOFDM signal, can adopt frequency comb maker or after electrical domain OFDM, upconvert to the method realization that area of light forms OOFDM signal.
For 4 road photon carrier waves, Figure 5 shows that the OOFDM flashlight subcarrier add drop multiplex exemplary plot realized based on Optical Add Drop Multiplexer method in the present invention.In Fig. 5, the generation of OOFDM signal adopts the method for frequency comb maker, and the light that laser is launched, after frequency comb maker, produce the light comb at 4 equifrequent intervals, and power is basically identical.Every root frequency comb can be regarded as a photon carrier wave, different frequency comb is just corresponding different photon carrier wave.Frequency interval between photon carrier wave is equal with the character rate that single sub-carrier transmits, thus meets orthogonality relation.The 4 road photon carrier waves produced input to modulation module respectively, and the photon carrier wave after modulation synthesizes after a road light signal through light Multiplexing module and transmits in a fiber.The generation of modulation signal can adopt the method for OFDM modulation or multistage modulation, multistage modulation can adopt as Quadrature Phase Shift Keying (Quadrature PhaseShift Keying, QPSK), quadrature amplitude modulation (Quadrature Amplitude Modulation, etc. QAM) modulation system increases band efficiency, realizes high-speed transfer.Unlike, when adopting multistage modulation, Synchronization Control is clock synchronous mainly; OFDM modulation is adopted then to need to carry out OFDM symbol Synchronization Control.QPSK modulation is have employed in Fig. 5 example.Provide according to the scheme in the present invention below Fig. 5, the spectrogram at the several diverse location place of OOFDM system of emulation and eye pattern.In Fig. 5, A point place is 4 tunnel synthesis photon spectrum of carrier figure, and 4 road photon spectrums of carrier overlap each other, orthogonal.
Optical network node place, adopts 4-OFFT to carry out demultiplexing to four road photon carrier waves and realizes the separation of photon carrier wave.OFFT forms by multiple DI is unit cascaded, and by exporting optical Fourier transform result corresponding to 4 road photon carrier waves after the process such as time delay, phase shift, and orthogonality each other can not be destroyed.Therefore, optical network node place can by OFFT module to OOFDM light signal in photon carrier wave carry out demultiplexing, thus realize photon carrier wave be separated.According to business demand, from 4 road photon carrier waves, the photon carrier wave needed for exporting from lower terminal (Drop) selectively, thus signal corresponding for this road photon carrier wave " is branched away " from node.The photon carrier signal branched away through the useful signal part needed for optical gate backgating, through recovery place primary signal such as detection demodulation etc.Owing to will keep original orthogonality, the centre frequency of the centre frequency Ying Yuxia road photon carrier wave that the photon carrier wave of insertion can be made corresponding is consistent, thus does not affect the orthogonality relation between the transmission of other photon carrier wave and photon carrier wave.Photon carrier wave of setting out on a journey inputs the channel of corresponding centre frequency from upper terminal (Add).And other and this locality photon carrier wave that has nothing to do is just direct by after OIFFT module is together with photon carrier multiplexing of setting out on a journey after filter shape, export from the line output (Main Output) of OADM.Because the photon carrier wave inserted still keeps orthogonal with straight-through photon carrier wave, therefore can make that straight-through photon carrier wave is impregnable to be passed through.In Fig. 5, B, C point place is the light signal eye pattern of the 2nd road photon carrier wave before and after optical gate, can find out after optical gate, and the clear eye pattern part that effective light signal is corresponding is out selected.As can be seen from Fig. 5 (b) and (c), the useful signal time reduces, and means video stretching, is unfavorable for multiplexing with OADM cascade.Therefore, straight-through photon carrier wave has to pass through light filter shape module and carries out Spectrum compression, and its useful signal time interval is increased.As the eye pattern that D place in Fig. 5 is signal after light filtering process, can find out in figure that sample interval increases, mean that the frequency spectrum of signal is compressed, find out in eye pattern and do not introduce intersymbol interference.
In the present invention, OADM module may be used for realizing the separation of OOFDM flashlight subcarrier, insertion, the function such as multiplexing.The present invention may be used for the OADM function at the novel optical transport network optical node place based on OOFDM technology, and the transparent transmission of supported data stream, energy loss is almost negligible, low in energy consumption, one-tenth book.At present, OFDM-QPSK transmission system based on 4-OFFT can support the transmission of 400Gb/s, and the transmission of 1Tb/s has been realized based on the OFDM-QPSK optical transmission system of 8-OFFT technology, this makes the OADM module in the present invention be expected to support the add drop multiplex of 100Gb/s high-speed optical signal.And OFFT technology is easier to realize upwards upgrading, and supports more points number OFFT, makes the present invention can support the Optical Add Drop Multiplexer of more multi-path light subcarrier in OOFDM signal.

Claims (8)

  1. The Optical Add Drop Multiplexer method of photon carrier wave in 1.OOFDM signal, is characterized in that, comprising:
    Optical Demultiplexing module carries out light separation by optical Fourier transform to photon carrier wave in the OOFDM light signal of input, select the useful signal part of multiple photon carrier signal after being separated, part photon carrier wave is exported by lower terminal as lower road light signal, and another part photon carrier wave inputs to light Multiplexing module as straight-through photon carrier wave after light filter shape; Utilize the frequency information of lower road photon carrier extract to carry out FEEDBACK CONTROL, make the centre frequency of light filter shape consistent with each road photon carrier frequency;
    Carry out control treatment by the information of lower road photon carrier extract to photon carrier wave of setting out on a journey, make to set out on a journey photon carrier wave and straight-through photon carrier wave keep just giving synchronous, and photon carrier wave of setting out on a journey after treatment inputs to light Multiplexing module through upper terminal.
  2. 2. the Optical Add Drop Multiplexer method of photon carrier wave in OOFDM signal as claimed in claim 1, it is characterized in that, the described control treatment to photon carrier wave of setting out on a journey is in order to make to set out on a journey photon carrier wave and straight-through photon carrier wave keep synchronous and orthogonal, make multiplexing after can synthesize the new OOFDM signal in a road.
  3. 3. the Optical Add Drop Multiplexer method of photon carrier wave in OOFDM signal as claimed in claim 1, it is characterized in that, described photon carrier Control of setting out on a journey being treated to by light injection phase-locking, extracting lower road photon carrier wave as setting out on a journey photon carrier wave from carrier extract or Wavelength reuse, to set out on a journey photon carrier signal through modulation generation again, or by the information extracting lower road photon carrier wave, frequency stabilization, phase control and Synchronization Control are carried out to photon carrier wave of setting out on a journey.
  4. 4. the Optical Add Drop Multiplexer method of photon carrier wave in OOFDM signal as claimed in claim 1, it is characterized in that, light Multiplexing module is used by carrying out light inverse Fourier transform to realize recovery to each road photon carrier wave of input.
  5. 5. optical add/drop multiplexer, is characterized in that, comprises Optical Demultiplexing module, photon carrier Control of setting out on a journey module, light filter shape module, light Multiplexing module;
    Described Optical Demultiplexing module is used for, light separation is carried out by the OOFDM signal of optical Fourier transform to input, the useful signal part isolating photon carrier signal is selected through optical gate, part photon carrier signal is exported by lower terminal as lower road light signal, and all the other photon carrier waves input to light Multiplexing module as straight-through photon carrier wave after light filter shape;
    Described set out on a journey photon carrier Control module for, by carrying out control treatment to the information of lower road photon carrier extract to photon carrier wave of setting out on a journey, make to set out on a journey photon carrier wave and straight-through photon carrier wave keep just giving synchronous;
    Described smooth filter shape module is used for, filtering process is carried out to the straight-through photon carrier wave that Optical Demultiplexing module exports, increase the useful signal time interval, the frequency spectrum of the straight-through photon carrier signal of compression, straight-through photon carrier wave after filtering process is inputed to light Multiplexing module, strengthens the cascade ability of optical add/drop multiplexer; Light filter shape module carries out FEEDBACK CONTROL from the frequency information of lower road photon carrier extract, makes the centre frequency of light filter shape module consistent with OOFDM flashlight sub-carrier frequencies;
    Described smooth Multiplexing module is used for, and is carried out recovering by set out on a journey photon carrier wave and the straight-through photon carrier wave from end of setting out on a journey and uses rear output.
  6. 6. optical add/drop multiplexer as claimed in claim 5, is characterized in that, described in photon carrier Control module of setting out on a journey by the information extracting lower road photon carrier wave, frequency stabilization, phase control and Synchronization Control are carried out to photon carrier wave of setting out on a journey;
    Or, described in set out on a journey photon carrier Control module by light injection phase-locking, extract lower road photon carrier wave as setting out on a journey photon carrier wave from carrier extract or Wavelength reuse, then to set out on a journey photon carrier signal through modulation generation.
  7. 7. optical add/drop multiplexer as claimed in claim 5, it is characterized in that, Optical Demultiplexing module comprises optical Fourier transform module, optical gate;
    Described optical Fourier transform module is used for, and realizes carrying out light separation to photon carrier wave in the OOFDM signal inputted by optical Fourier transform;
    Optical gate, for after optical Fourier transform demultiplexing, gating isolates the useful signal part of photon carrier signal, light signal correspondence is exported to lower terminal or light Multiplexing module.
  8. 8. optical add/drop multiplexer as claimed in claim 5, is characterized in that, light Multiplexing module to be realized setting out on a journey the multiplexing of photon carrier wave and direct photon carrier wave by light inverse Fourier transform; Light inverse Fourier transform module adopts with the processing mode of optical Fourier transform module contrary or adopts fiber coupler to realize.
CN201210315301.4A 2012-08-30 2012-08-30 Optical add drop multiplexing method for photonic carriers in OOFDM (optical orthogonal frequency division multiplexing) signals and optical add drop multiplexer Expired - Fee Related CN103001724B (en)

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