CN102340477A - 100Gbit/s optical signal transmitting system and method based on optical orthogonal frequency division multiplexing - Google Patents
100Gbit/s optical signal transmitting system and method based on optical orthogonal frequency division multiplexing Download PDFInfo
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Abstract
The invention provides a 100Gbit/s optical signal transmitting system and a method based on optical orthogonal frequency division multiplexing (OOFDM). A polarization multiplexing module in the transmitting system uses a polarization beam splitter to split an optical carrier into two beams of light with polarization directions which are perpendicular to each other. Subcarrier modulation is respectively conducted to the two loops of optical carriers to obtain two loops of orthogonal polarization subcarrier multiplexing modulation signals. A subcarrier multiplexing module in the transmitting system adopts two cascade stages of Mach-Zehnder modulators (MZM) in a cascaded way to generate multiple-sideband optical subcarriers and uses a direct-current power supply control modulator to enable the multiple-sideband optical subcarriers to be in a carrier suppression state to generate the multiple-sideband optical subcarriers. A waveform generation modulation in the transmitting system uses any waveform generator to convert low-speed digital signal sequences into in-phase and two loops of quadrature (I/Q) analog signal waveforms which are used for driving an IQ modulator to generate OOFDM signals. Finally, a polarization beam combiner is used for coupling two beams of modulated optical signals with orthogonal polarization directions to enter a transmission link. The system and the method provided by the invention have the advantage that the transmission of 100Gbit/s OOFDM signals can be realized at low cost.
Description
Technical field
The present invention relates to optical communication field, particularly a kind of new 100Gbit/s light signal emission system and method based on light positive friendship frequency division multiplexing OOFDM.
Background technology
Orthogonal frequency division multiplex OFDM is a kind of special multi-transceiver technology, strengthens the ability of opposing multipath fading through the cycle that prolongs transmission symbol, is a kind of new and effective digital modulation technique.Hand over frequency multiplexing technique OOFDM as a kind of frequency domain modulation technology to the light positive of optical communication field the OFDM technical application; Having the very high availability of frequency spectrum, very strong chromatic dispersion CD and the advantage of polarization mode dispersion PMD tolerance, is a kind of very potential high speed long-distance optical communication technology.In the present existing report, use the transmission experiment of OOFDM technology, the highest data rate is 110Gbit/s.The design of existing OOFDM transmission system transmitter does not have real feasibility owing to receive the restriction of current electronics D/A converter spare processing speed.
Hand over the implementation method of the 100Gbit/s light signal emission system of frequency division multiplexing OOFDM based on light positive; Can use the signal of telecommunication of 100Gb/s behind IFFT, to produce through base band or the logical ofdm signal modulated optical carrier of band again on the principle; But in fact receive the restriction of the processing speed of current electronics D/A converter spare, do not possess feasibility; Realize the transmission experiment of high speed OOFDM through palarization multiplexing; 52.5Gbit/s ofdm signal in conventional fiber, transmitted 4160km; Because the limited bandwidth of mould/number A/D and D/A D/A converter, the method can't realize the generation of 100Gbit/s OOFDM signal; In the 110Gbit/sOOFDM transmission experiment, transmitted 80km in the conventional fiber, this is the flank speed OOFDM report of seeing at present, but in this system the OOFDM signal actual be that method through wave division multiplexing WDM produces.Therefore the OOFDM signal that directly produces one road 100Gbit/s does not possess feasibility.
And the method for existing generation 100Gbit/s light positive friendship frequency division multiplexing OOFDM signal mainly is to utilize radiofrequency signal and frequency mixer to produce the ofdm signal of polygon band in electric territory, this ofdm signal is loaded on the light carrier again.Such system configuration more complicated, and cost is higher.For the complexity that reduces system and the cost of system, the present invention in the light territory utilization cascade modulate and produce a plurality of sideband optical sub-carriers, load information simultaneously on the subcarrier of a plurality of sidebands is realized the generation of 100Gbit/sOOFDM signal.This method has also reduced the requirement to A/D and D/A converter speed when reducing the baseband signal transmission rate, make the cost of system reduce greatly.
Fig. 1 is the structural representation that existing generation 100Gbit/s light positive is handed over frequency division multiplexing OOFDM signal.Combine Fig. 1 at present, hand over the method for frequency division multiplexing OOFDM signal to describe existing generation 100Gbit/s light positive, specific as follows:
Light source module produces light carrier with LD101, exports this light carrier to polarization beam apparatus PBS102, and the effect of PBS is that light carrier is divided into the vertical two-beam in polarization direction, and then adopts modulator 106 that electric ofdm signal is modulated on the light carrier respectively.In electric OFDM generation module; Earlier that two-way speed is identical baseband OFDM signal carries out mixing with radiofrequency signal RF1 and the RF2 that radio frequency source 103 and 104 produces through frequency mixer 105 respectively; Purpose is that the ofdm signal with base band carries out frequency spectrum shift, comes driven modulator 106 with this signal then.Modulator is in the carrier suppressed state, makes its output signal produce two upper and lower sidebands, totally four sidebands, and shown in 109 and 110, wherein 109 is the lightwave signal of x direction, 110 is the lightwave signal of y direction.Transmit two ways of optical signals is multiplexing through polarized composite wave device PBC107 more together.Adjustable light wave-filter TOF108 is used for filtering upper sideband or this lower sideband wherein, causes walking from phenomenon of two sidebands to prevent chromatic dispersion.And utilize the speed that goes up the multiplexing OOFDM of the making signal of lower sideband to be promoted to 100Gbit/s.
Above-mentioned existing 100Gbit/s light positive is handed over frequency division multiplexing OOFDM method complex structure, and it is many wherein to be applied to number of devices such as frequency mixer, and price comparison is expensive.Therefore, utilize present band-limited A/D and D/A D/A converter to realize that the OOFDM emission system of 100Gbit/s and method are extremely urgent.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of 100Gbit/s light signal emission system and method based on light positive friendship frequency division multiplexing OOFDM, the present band-limited mould of this method utilization/number A/D and D/A D/A converter reduced the cost of realizing; And can reduce of the requirement of CO-OFDM system, thereby overcome the electronic bottleneck of A/D and D/A converter bandwidth to DAC and ADC sample rate.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Visible by above-mentioned technical scheme, the invention provides a kind of 100Gbit/s light signal emission system and method based on light positive friendship frequency division multiplexing OOFDM, the light source module that comprises in the emission system utilizes LD201 to produce light carrier; The palarization multiplexing module that emission system comprises utilizes polarization beam apparatus 202 that light carrier is divided into the vertical two-beam in polarization direction, i.e. x polarization and y polarization two-way.This two-way light carrier is carried out the subcarrier multiplexing modulation signal that sub-carrier modulation obtains the two-way polarized orthogonal respectively; The subcarrier multiplexing module that emission system comprises; Adopt the mode of two modulators 212 and 215 cascades to produce the optical sub-carrier of a plurality of sidebands, wherein, utilize DC power supply 213 to control modulator 212; Make it be in the carrier suppressed state; Will produce the carrier wave of two sidebands like this, shown in module 217, then this carrier wave exported to and proceed modulation in the modulator 215.The radiofrequency signal RF2 that modulator 215 usefulness radio frequency sources 214 produce drives; And control modulator 215 with DC power supply 216; Make it be in the carrier suppressed state, have six sidebands like this and produce, shown in module 218; Load information on this multicarrier realizes that subcarrier multiplexing produces the OOFDM signal again; The baseband signal sequence generation module that emission system comprises utilizes MATLAB to produce the baseband signal sequence 24 1 of low speed; The waveform generation module that emission system comprises utilizes AWG 242 to produce the signal waveform of two-way I/Q simulation; The I that the IQ modulation module that emission system comprises utilizes waveform generator to produce, Q two-way analog signal waveform drive IQ modulator 243 and produce photosignal waveform; The palarization multiplexing module that emission system comprises is utilized polarization beam combiner 203 that the light signal of two modulated bundle polarization direction quadratures is coupled and is got in the transmission link.The method that this invention proposes has realized the high-speed transfer of light signal, i.e. the OOFDM signal of 100Gbit/s transmission on basis cheaply.
Description of drawings
Fig. 1 hands over the structural representation of frequency division multiplexing OOFDM emission system for existing 100Gbit/s light positive.
Fig. 2 is the structural representation that new 100Gbit/s light positive is handed over frequency division multiplexing OOFDM emission system.
Fig. 3 improves the structural representation of OOFDM signal rate for adopting the palarization multiplexing mode.
Fig. 4 produces the structural representation of OOFDM signal for sub-carrier modulation.
Fig. 5 improves the structural representation of OOFDM signal rate for adopting palarization multiplexing and subcarrier multiplexing.
Fig. 6 the present invention is based on light positive to hand over the 100Gbit/s light signal emission system of frequency division multiplexing OOFDM and the flow chart of method.
The practical implementation method
For make the object of the invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, to further explain of the present invention.
The invention provides the 100Gbit/s light signal generating method of handing over frequency division multiplexing OOFDM based on light positive.
The mode that emitter at first adopts the subcarrier multiplexing that forms based on the modulator cascade to combine with palarization multiplexing in this method produces light positive friendship frequency division multiplexing OOFDM signal.The value of this mode is to eliminate the optical fiber dispersion influence.The realization of said this mode need be adopted the mode of two-stage Mach zehnder modulators MZM cascade, through its driving voltage of accurate adjustment, bias voltage and polarization state, thus the generation of realization high speed OOFDM signal.
Bandwidth constraints when the value of said this mode is to have broken through by D/A converter generation ofdm signal.The mode that adopts subcarrier multiplexing and palarization multiplexing to combine, and carrier suppressed is all carried out on every road modulate, make full use of the subcarrier resources that is produced, make each subcarrier carry the speed that the signal sum reaches 100Gbit/s.
Fig. 3 improves the structural representation of OOFDM signal rate for adopting the palarization multiplexing mode.Fig. 4 produces the structural representation of OOFDM signal for sub-carrier modulation.Fig. 5 improves the structural representation of OOFDM signal rate for adopting palarization multiplexing and subcarrier multiplexing.The method that at present combines Fig. 3, Fig. 4 and Fig. 5 to specify how to utilize palarization multiplexing and subcarrier multiplexing to improve OOFDM speed step by step specifies as follows:
As shown in Figure 3, utilize palarization multiplexing to improve the speed of OOFDM signal.In Fig. 3, the light carrier that utilizes light source module LD301 to produce exports this light carrier to polarization beam apparatus PBS302.The effect of PBS is the two-beam that light carrier is divided into the polarization direction quadrature, i.e. x polarization direction and y polarization direction.Modulate among the modulation module MZM305 and 306 about the light carrier that the polarization direction is different is sent into respectively in the two-way, the used baseband OFDM signal 303 of modulators drives still produces with MATLAB.Up and down two-way modulated light carrier wave exports among the polarization beam combiner PBC307 with the light beam coupling of two bundle polarization direction quadratures together then.Adopted after the palarization multiplexing, the speed of OOFDM signal has been promoted one times.
The described OOFDM signal of Fig. 3 remains and carries through light that baseband OFDM produces; Be subject to the restriction of current electronic device 20Gbit/s OFDM base band signal process speed, also can only reach 40Gbit/s through the OOFDM flank speed that changes modulation format and palarization multiplexing carrying baseband OFDM.In order further to improve the speed of OOFDM signal, can the baseband OFDM signal be carried out frequency spectrum shift, and multiplexing mode with different subcarrier RF signals.Fig. 4 produces the structural representation of OOFDM signal for adopting sub-carrier modulation.At first the radiofrequency signal RF1 that radio frequency source 402 produces is modulated on the light carrier of light source 401 generations with modulator block 403.Wherein control modulator 403, make it be in the carrier suppressed state, will produce the carrier wave of two sidebands like this, shown in module 409 with DC power supply DC404.Again this carrier wave is exported to and proceed modulation in the modulator 406.The radiofrequency signal RF2 that modulator 406 usefulness radio frequency sources 405 produce drives, and controls modulator 406 with DC power supply DC407, makes it be in the carrier suppressed state, and the subcarrier that has six sidebands like this produces, shown in module 410.Again this carrier wave is exported to and carry out signal loading in the modulator 408, owing to always have the signal that 7 carrier waves can be used for loading 100Gbit/s, so the signal rate on each carrier wave can be reduced to about 15Gbit/s.
Fig. 5 produces the structural representation of OOFDM signal for adopting palarization multiplexing and subcarrier multiplexing simultaneously.The light carrier that light source LD501 produces is divided into the two-way light of polarization direction quadrature, i.e. x polarization and y polarization two-way through PBS502.This two-way light carrier is carried out the subcarrier multiplexing modulation signal that sub-carrier modulation obtains the two-way polarized orthogonal respectively.Wherein, subcarrier multiplexing adopts the two-stage sub-carrier modulation.The radiofrequency signal RF1 that at first with modulator MZM512 radio frequency source 511 is produced is modulated on the x polarised light carrier wave of PBS502 output; Utilize DC power supply 513 to control modulator MZM512; Make it be in the carrier suppressed state, will produce the carrier wave of two sidebands like this, shown in module 517.Again this carrier wave is exported to and proceed modulation in the modulator 515.Modulator MZM515 drives with the radiofrequency signal RF2 that radio frequency source 514 produces, and controls modulator 515 with DC power supply 516, makes it be in the carrier suppressed state, has six sidebands like this and produces, shown in module 518.Again this carrier wave is exported to and carry out signal loading in the IQ modulator 543.The production method of the signal that loads is following: at first produce a series of digital signal by burst 541, export this Serial No. to produce simulation among the AWG AWG542 signal waveform, AWG output I/Q two-way analog signal waveform; With this I/Q two-way analog waveform the IQ modulator is driven the loading of completion information again.Then with modulated optical carrier output.Modulation system x branch road for the y branch road is identical, just repeats no more here.At last the subcarrier multiplexing signal of two-way polarization direction quadrature is exported to lump together among the PBC503 to send in the link and transmit.At first adopt twice sub-carrier modulation to obtain 7 carrier waves altogether in this method and be used for load signal, can signal rate be reduced by 7 times; Add and then after the palarization multiplexing that speed can be reduced to 14 times, promptly the signal rate in the base band is just to satisfy the signal transmission of 100Gbit/s about 7.5Gbit/s.Make its rate requirement to A/D and D/A converter is reduced greatly, just can satisfy the signal transmission of two-forty with existing device.
Fig. 6 the present invention is based on light positive to hand over the 100Gbit/s light signal emission system of frequency division multiplexing OOFDM and the flow chart of method.Combine Fig. 6 at present, hand over 100Gbit/s light signal emission system and the method for frequency division multiplexing OOFDM to describe the present invention is based on light positive, specific as follows:
Step 601: the light carrier that utilizes polarization beam apparatus that light source is produced is divided into the two-beam of polarization direction quadrature.
In this step, concrete method is following:
Step 6011 produces optical carrier with light source LD, and this light carrier is exported in the polarization beam apparatus;
Step 6011 utilizes polarization beam apparatus that light carrier is divided into the two-beam carrier wave of polarization direction quadrature, i.e. x direction polarised light and y direction polarised light;
Step 6012 exports two vertical light carriers in polarization direction to the subcarrier multiplexing modulation module and modulates.
Step 602: utilize the two-way light carrier of the modulator pair of orthogonal of cascade to carry out sub-carrier modulation.
In this step, concrete modulator approach is following:
Step 6021 with first MZM modulator of radio frequency signals drive, makes it be in the carrier suppressed state with this modulator of DC power supply control, makes the light carrier after modulating produce the optical sub-carrier of two sidebands;
Step 6022; The optical sub-carrier that produces in the step 6021 exported in second MZM modulator proceed sub-carrier modulation; Make it be in the carrier suppressed state with this modulator of DC power supply control equally; Through after the sub-carrier modulation for the second time, can produce the optical sub-carrier of 6 sidebands, have 7 light carriers like this and can be used for load signal.
Step 603: utilize waveform generator to produce IQ two-way analog signal waveform.
In this step, concrete signal waveform production method is following:
Step 6031 is with the baseband signal Serial No. of MATLAB generation low rate;
Step 6032 exports Serial No. among the AWG AWG to, utilizes AWG that Serial No. is converted into IQ two-way analog signal waveform.
Step 604: utilize the IQ modulator that signal loading is realized the OOFDM signal to each subcarrier.
In this step, concrete implementation method is following:
Step 6041 is input to the optical sub-carrier of exporting after the subcarrier multiplexing in the IQ modulator, as the light carrier of IQ modulator;
Step 6041, the IQ analog signal waveform of exporting with step 603 drives the IQ modulator, and signal loading to each optical sub-carrier, is realized the OOFDM signal.
Step 605: utilize polarization beam combiner to realize that palarization multiplexing improves the speed of OOFDM signal, be about to the light signal of two polarization directions of load signal and export to and close bundle in the polarization beam combiner, and export in the link and transmit.
In this embodiment, what subcarrier multiplexing adopted is the mode of two-stage cascade, and what palarization multiplexing adopted is the mode of x direction and y direction palarization multiplexing.
As shown in Figure 5, the light carrier that light source LD501 produces is divided into the two-way light of polarization direction quadrature, i.e. x polarization and y polarization two-way through PBS502.This two-way light carrier is carried out the subcarrier multiplexing modulation signal that sub-carrier modulation obtains the two-way polarized orthogonal respectively.Wherein, subcarrier multiplexing adopts the two-stage sub-carrier modulation.The radiofrequency signal RF1 that radio frequency source 511 is produced with modulator MZM512 is modulated on the x polarised light carrier wave of PBS502 output; Utilize DC power supply 513 to control modulator MZM512; Make it be in the carrier suppressed state; Will produce the carrier wave of two sidebands like this, this carrier wave exported to proceed modulation in the modulator 515 again.Modulator MZM515 drives with the radiofrequency signal RF2 that radio frequency source 514 produces; And control modulator 515 with DC power supply 516; Make it be in the carrier suppressed state, have six sidebands like this and produce, this carrier wave is exported to carry out signal loading in the IQ modulator 543 again.The production method of the signal that loads is following: at first produce a series of digital signal by burst 541, export this Serial No. to produce simulation among the AWG AWG542 signal waveform, AWG output I/Q two-way analog signal waveform; With this I/Q two-way analog waveform the IQ modulator is driven the loading of completion information again.Then with modulated optical carrier output.Modulation system x branch road for the y branch road is identical, just repeats no more here.At last the subcarrier multiplexing signal of two-way polarization direction quadrature is exported to lump together among the PBC503 to send in the link and transmit.
The light source module of present embodiment utilizes LD201 to produce light carrier; Palarization multiplexing module in the present embodiment utilizes polarization beam apparatus 202 that light carrier is divided into the vertical two-beam in polarization direction; Be x polarization and y polarization two-way, this two-way light carrier is carried out the subcarrier multiplexing modulation signal that sub-carrier modulation obtains the two-way polarized orthogonal respectively; Subcarrier multiplexing module in the present embodiment; Adopt the mode of two modulators 212 and 215 cascades to produce the optical sub-carrier of a plurality of sidebands; Wherein, utilize DC power supply 213 to control modulator 212, make it be in the carrier suppressed state; Will produce the carrier wave of two sidebands like this, then this carrier wave exported to and proceed modulation in the modulator 215.The radiofrequency signal RF2 that modulator 215 usefulness radio frequency sources 214 produce drives; And control modulator 215 with DC power supply 216, and make it be in the carrier suppressed state, have six sidebands like this and produce; Load information on this multicarrier realizes that subcarrier multiplexing produces the OOFDM signal again; Baseband signal sequence generation module in the present embodiment utilizes MATLAB to produce the baseband signal sequence 24 1 of low speed; Waveform generation module in the present embodiment utilizes AWG 242 to produce the signal waveform of two-way I/Q simulation; The I that IQ modulation module in the present embodiment utilizes waveform generator to produce, Q two-way analog signal waveform drive IQ modulator 243 and produce photosignal waveform; Palarization multiplexing module in the present embodiment is utilized polarization beam combiner 203 that the light signal of two modulated bundle polarization direction quadratures is coupled and is got in the transmission link.Utilize lower cost to realize the emission that the 100Gbit/s light positive is handed over frequency-division multiplex singal in the present embodiment.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (8)
1. hand over the 100Gbit/s light signal emission system of frequency division multiplexing OOFDM based on light positive for one kind, it is characterized in that this system comprises:
The light source module that comprises in the said emission system produces light carrier, utilizes sub-carrier modulation and palarization multiplexing to improve the speed of signal;
2. according to claims 1 described system, it is characterized in that described light source module comprises:
Said light source module utilizes light-emitting diode LD to produce light carrier.
3. according to claims 1 described system, it is characterized in that described polarization beam splitting module comprises: polarization beam apparatus
Described polarization beam splitting module utilizes polarization beam apparatus that light carrier is become the vertical two-beam in polarization direction, and promptly x polarization and y polarization two-way are modulated respectively in the branch road about again that this polarization direction is vertical two-way light carrier is sent into;
4. according to claims 1 described system, it is characterized in that described subcarrier multiplexing modulation module comprises: first order sub-carrier modulation module and second level sub-carrier modulation module;
Said first order sub-carrier modulation module is at first modulated light carrier, makes it produce the optical sub-carrier of two sidebands;
Said second level subcarrier multiplexing modulation module is then modulated the optical sub-carrier of first order subcarrier module modulation output, makes its optical sub-carrier that produces six sidebands, has 7 light carriers and comes load information.
5. according to claims 4, it is characterized in that described first order subcarrier multiplexing modulation module comprises: radio frequency source, optical modulator and DC power supply;
Said radio frequency source produces sinusoidal radio frequency signal, and exports this radiofrequency signal an electric signal input end mouth of optical modulator to;
Said optical modulator utilizes MZ Mach-Zehnder MZM to come light carrier is modulated, one of which end input light carrier, and an end input radio frequency signal, and DC power supply is controlled it;
Said DC power supply control optical modulator makes it be in the carrier suppressed state, makes the light carrier after modulating produce the subcarrier of two sidebands.
6. according to claims 4, it is characterized in that said second level subcarrier multiplexing modulation module comprises: radio frequency source, optical modulator and DC power supply;
Said radio frequency source produces sinusoidal radio frequency signal, and exports this radiofrequency signal an electric signal input end mouth of optical modulator to;
Said optical modulator utilizes MZ Mach-Zehnder MZM to come light carrier is modulated, one of which end input light carrier, and an end input radio frequency signal, and DC power supply is controlled it;
Said DC power supply control optical modulator makes it be in the carrier suppressed state, makes the light carrier after modulating produce the subcarrier of six sidebands.
7. according to claims 1, it is characterized in that said signal loading module comprises: burst generation module, waveform generation module and IQ modulation module
Said burst generation module utilizes MATLAB to produce the baseband signal sequence of low speed, exports this sequence to waveform generation module;
Said waveform generation module utilizes AWG to produce the signal waveform of two-way I/Q simulation;
The light wave of said IQ modulator input is the light wave with 7 light carriers that produces through two-stage subcarrier multiplexing modulation back; And the I that utilizes waveform generator to produce; Q two-way analog signal waveform drives the IQ modulator and produces photosignal waveform; Its effect be with signal loading to each light carrier, realize the generation of OOFDM signal, and reduced the signal rate on the single light carrier.
8. according to claims 1, it is characterized in that said polarization closes the bundle module and comprises:
Said polarization closes the bundle module and utilizes light signal that polarization beam combiner will two modulated bundle polarization direction quadratures to be coupled to get in the transmission link, and coupling total signal rate afterwards reaches 100Gbit/s.
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| CN105610754A (en) * | 2015-12-23 | 2016-05-25 | 商洛学院 | High-speed OOFDM (Optical Orthogonal Frequency Division Multiplexing) signal transmitting system and method based on multilevel modulation |
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Application publication date: 20120201 |