CN103733547B - Optical line terminal, optical network system and signal processing method - Google Patents
Optical line terminal, optical network system and signal processing method Download PDFInfo
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- CN103733547B CN103733547B CN201380001486.4A CN201380001486A CN103733547B CN 103733547 B CN103733547 B CN 103733547B CN 201380001486 A CN201380001486 A CN 201380001486A CN 103733547 B CN103733547 B CN 103733547B
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Abstract
The present invention relates to a kind of optical line terminal, optical network unit, optical network system and signal processing method, described optical line terminal includes: laser instrument, wave multiplexer, image intensifer, photomodulator, the first optical fiber and the second optical fiber；Described first optical fiber, is excited by stimulated Brillouin scattering SBS for the described direct current light produced by described laser instrument, forms local oscillator light and the first sub-light wave of reverse transfer, and gives described wave multiplexer by described local oscillator optical transport；Described second optical fiber, for being excited by SBS by the optical signal after described image intensifer processing and amplifying, is formed light carrier and the second sub-light wave of reverse transfer, and described light carrier is transferred to described photomodulator；Described wave multiplexer, the photosynthetic wave signal that local oscillator light and the described photomodulator for being formed by described first optical fiber is formed forms light many bands multiplexed signals and exports.The present invention can overcome the high frequency attenuation that fibre-optical dispersion causes, and overcomes that various photoelectric device is not enough in the frequency response of high frequency treatment, roll-offs.
Description
Technical field
The present invention relates to network communication technology field, particularly relate to a kind of optical line terminal, optical network unit, optical network system and signal processing method.
Background technology
EPON (Passive Optical Network, PON) it is the soft exchange technology of a kind of point-to-multipoint, it is increasingly becoming mainstream technology in broadband access field, along with various broadband services, such as the fast development of video conference, 3D TV, mobile retransmission, interactive game etc., more and more higher to the demand of access bandwidth.The broadband evolution faced the future, needs bigger bandwidth, distance, big branch.
Current most of PON is all based on Time Division Multiple Access (Time Division Multiple Address, TDMA) mode, typical PON system includes optical line terminal (Optical Line Terminal, OLT), beam splitter (Splitter), optical network unit (Optical Network Unit, ONU), wherein, beam splitter constitutes Optical Distribution Network (Optical Distribution Network with trunk optical fiber, ODN), multiple optical network units are connected to beam splitter by optical fiber, it is connected to optical line terminal (local side) by trunk optical fiber after convergence.Optical network unit shares trunk optical fiber by TDMA mode.
Existing optical network system uses many bands frequency division multiplexing (Multi Band Frequency Division Multiplexing mostly, many bands FDM) technology, transmitting terminal (i.e. optical line terminal) produces many bands FDM signal in electrical domain, utilize bit loading algorithm, i.e. close ropy channel at the less bit of ropy transmission, carry out many bands transmission (Multi Band Transmission), bandwidth can be made full use of.
But, this electricity many bands FDM mode needs higher radio-frequency devices bandwidth, there is frequency and roll-off in such radio-frequency devices, and then cause radio-frequency devices serious at high frequency treatment performance degradation, even if electric many bands FDM needs to use complicated channel to estimate and bit loading algorithm, still having a lot of HFS serious due to frequency decay, it is impossible to be obtained by, the requirement to optical filter is the highest.
Summary of the invention
It is an object of the invention to provide a kind of optical line terminal, optical network unit, optical network system and signal processing method, the base band best at optical fiber and radio-frequency devices transmission performance is transmitted, the high frequency attenuation that fibre-optical dispersion can be overcome to cause, overcomes that various photoelectric device is not enough in the frequency response of high frequency treatment, roll-offs.
For achieving the above object, first aspect present invention provides a kind of optical line terminal, and described optical line terminal includes: laser instrument, wave multiplexer, image intensifer, photomodulator, the first optical fiber and the second optical fiber；
Described laser instrument, is used for producing direct current light；
Described first optical fiber, it is connected with described laser instrument and described wave multiplexer, described direct current light for being produced by described laser instrument is excited by stimulated Brillouin scattering SBS, forms local oscillator light and the first sub-light wave of reverse transfer, and gives described wave multiplexer by described local oscillator optical transport；Wherein, described local oscillator light is that in described direct current light, luminous power is less than the optical signal of SBS threshold, and described first sub-light wave is the optical signal that in described direct current light, luminous power is more than SBS threshold；
Described image intensifer, is connected with described first optical fiber and described second optical fiber, for described first sub-light wave carries out optical signal amplification process, and gives described second optical fiber by the optical signal transmission after described processing and amplifying；
Described second optical fiber, it is connected with described image intensifer and described photomodulator, for the optical signal after described image intensifer processing and amplifying is excited by SBS, form light carrier and the second sub-light wave of reverse transfer, and described light carrier is transferred to described photomodulator；Wherein, described second sub-light wave is that in the optical signal after described processing and amplifying, luminous power is more than the optical signal of SBS threshold, and described light carrier is the optical signal that in the optical signal after described processing and amplifying, luminous power is less than SBS threshold；
Described photomodulator, is connected with described second optical fiber and described wave multiplexer, forms flashlight, and be transferred to described wave multiplexer after being modulated by the downstream electrical signals of described light carrier Yu input；
Described wave multiplexer, is connected with described first optical fiber and described photomodulator, and the photosynthetic wave signal that local oscillator light and the described photomodulator for being formed by described first optical fiber is formed forms light many bands multiplexed signals and exports.
In conjunction with first aspect, in the first possible embodiment of first aspect, described first optical fiber is connected with described laser instrument by the first optical circulator, first end of described first optical circulator is connected with the outfan of described laser instrument, second end of described first optical circulator is connected with described first optical fiber, the described direct current light produced by described laser instrument is transferred to described first optical fiber, 3rd end of described first optical circulator is connected with the input of described image intensifer, the described first sub-light wave transmissions formed by described first optical fiber is to described image intensifer.
In conjunction with first aspect, in the embodiment that the second of first aspect is possible, described image intensifer is connected with described second optical fiber by the second optical circulator, first end of described second optical circulator is connected with the outfan of described image intensifer, second end of described second optical circulator is connected with described second optical fiber, described second optical fiber is given by the optical signal transmission after described image intensifer processing and amplifying, 3rd end image intensifer described with the next one of described second optical circulator is connected, next described image intensifer is given by the described second sub-light wave transmissions of formation in described second optical fiber.
In conjunction with first aspect, in the third possible embodiment of first aspect, the described first sub-light wave formed in described first optical fiber is △ f with the frequency difference of the direct current light that described laser instrument produces, and the described second sub-light wave formed in described second optical fiber is △ f with the frequency difference of described first sub-light wave.
Second aspect, present invention also offers a kind of optical network unit, and described optical network unit includes: photelectric receiver, band filter and demodulator；
Described photelectric receiver, for receiving light many bands multiplexed signals that optical line terminal sends, described light many bands multiplexed signals includes local oscillator light and multiple flashlight, and described flashlight carries out relevant mixing respectively with described local oscillator light, obtains electric many bands multiplexed signals；
Described band filter, the described electricity many bands multiplexed signals for obtaining described photelectric receiver carries out bandpass filtering, obtains the signal of telecommunication of required frequency range, and transmission to described demodulator is demodulated.
The third aspect, present invention also offers a kind of optical network system, and described optical network system includes: the optical line terminal described in the embodiment of the present invention, the optical network unit described in the embodiment of the present invention and Optical Distribution Network ODN；
Described optical line terminal is connected with described optical network unit by described Optical Distribution Network.
Fourth aspect, present invention also offers a kind of optical network signal processing method, and described method includes:
The direct current light that laser instrument produces is transmitted in the first optical fiber, is excited by stimulated Brillouin scattering SBS, forms local oscillator light and the first sub-light wave of reverse transfer；Wherein, described local oscillator light is that in described direct current light, luminous power is less than the optical signal of SBS threshold, and described first sub-light wave is the optical signal that luminous power is more than SBS threshold；
Described first sub-light wave is carried out optical signal amplification process, and the optical signal after described processing and amplifying is transmitted in the second optical fiber, excited by SBS, form light carrier and the second sub-light wave of reverse transfer；Wherein, described second sub-light wave is the optical signal that in the optical signal after described processing and amplifying, luminous power is more than SBS threshold, described light carrier is that in the optical signal after described processing and amplifying, luminous power is less than the optical signal of SBS threshold, and described light carrier forms flashlight with the downstream electrical signals of input after being modulated；
Described local oscillator light and described photosynthetic wave signal form light many bands multiplexed signals, and export light many bands multiplexed signals to optical network unit.
In conjunction with fourth aspect, in the first possible embodiment of fourth aspect, described first sub-light wave is △ f with the frequency difference of the direct current light that described laser instrument produces, and described second sub-light wave is △ f with the frequency difference of described first sub-light wave.
In conjunction with fourth aspect, in the embodiment that the second of fourth aspect is possible, described light many bands multiplexed signals is exported to optical network unit before, also include: light many bands multiplexed signals described in multichannel is combined into a road, send the light many bands multiplexed signals after compound to optical network unit by optical fiber.
5th aspect, present invention also offers a kind of optical network signal processing method, and described method includes:
Receiving light many bands multiplexed signals that optical line terminal sends, described light many bands multiplexed signals includes local oscillator light and multiple flashlight, and described flashlight carries out relevant mixing respectively with described local oscillator light, obtains electric many bands multiplexed signals；
Described electricity many bands multiplexed signals is carried out bandpass filtering, obtains the signal of telecommunication of required frequency range, and carry out demodulation process and obtain the downstream signal that described optical line terminal receives.
Optical line terminal, optical network unit, optical network system and the signal processing method that the present invention provides, excited by SBS and produce the light carrier that between wavelength, frequency interval is stable, all subband signals can be made all to be transmitted in the base band that optical fiber and radio-frequency devices transmission performance are best, it is thus possible to the high frequency attenuation overcoming fibre-optical dispersion to cause, overcome that various photoelectric device is not enough in the frequency response of high frequency treatment, roll-off.
Accompanying drawing explanation
The structural representation of the optical network system that Fig. 1 provides for the embodiment of the present invention one；
Light many bands multiplexed signals schematic diagram of the optical line terminal output that Fig. 2 a provides for the embodiment of the present invention one；
Electricity many bands multiplexed signals schematic diagram of the photelectric receiver output that Fig. 2 b provides for the embodiment of the present invention one；
The signal schematic representation of the band filter output that Fig. 2 c provides for the embodiment of the present invention one；
The structural representation of the optical network system that Fig. 3 provides for the embodiment of the present invention two；
The structural representation of the optical network system that Fig. 4 provides for the embodiment of the present invention three；
A kind of optical network signal process flow figure that Fig. 5 provides for the embodiment of the present invention four；
Another optical network signal process flow figure that Fig. 6 provides for the embodiment of the present invention four.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
The downlink mode of passive optical network PON is all to use broadcast mode, by beam splitter, the information of broadcast is distributed to several user terminals.Optical line terminal, optical network unit, optical network system and the signal processing method that the embodiment of the present invention provides, the compatible existing PON (PON based on beam splitter) being deployed, it is equally applicable to other PON structure, such as access network architecture of future generation: Wave division multiplexing passive optical network WDM PON, time-division Wave division multiplexing passive optical network TWDM PON etc..
Embodiment one
Fig. 1 is the structural representation of the optical network system that the present embodiment provides, as shown in Figure 1, the optical network system of the present invention includes: optical line terminal 1, beam splitter 2 and optical network unit 3, multiple optical network units 3 are connected to beam splitter 2 by optical fiber 4, and beam splitter 2 is connected with optical line terminal 1 by trunk optical fiber 5.
Optical line terminal 1 includes: laser instrument the 11, first optical circulator the 12, first optical fiber 13, image intensifer the 14, second optical circulator the 15, second optical fiber 16, photomodulator 17 and wave multiplexer 18.
Laser instrument 11 is used for producing direct current light.Laser instrument 11 is connected with the first optical fiber 13 by the first optical circulator 12, and the first optical fiber 13 is for direct current light λ produced by laser instrument 110Excited by stimulated Brillouin scattering SBS, form local oscillator light and the first sub-light wave λ of reverse transfer1, the first optical fiber 13 is also connected with wave multiplexer 18, and by described local oscillator optical transport to wave multiplexer 18.Wherein, described local oscillator light is described direct current light λ0Middle luminous power is less than the optical signal of SBS threshold, described first sub-light wave λ1For described direct current light λ0Middle luminous power is more than the optical signal of SBS threshold.Direct current light λ that the local oscillator light formed in first optical fiber 13 produces with laser instrument 110Between without frequency difference, the first sub-light wave λ formed in the first optical fiber 131Direct current light λ produced with laser instrument 110Frequency difference be △ f, and, the size of this frequency difference △ f can control.
Image intensifer 14 is connected with the first optical fiber 13 by the first optical circulator 12, and is connected with the second optical fiber 16 by the second optical circulator 15, for the described first sub-light wave λ formed in the first optical fiber 131Carry out optical signal amplification process, and the optical signal after described processing and amplifying is transferred to the second optical fiber 16 by the second optical circulator 15.
Wherein, the first end of the first optical circulator 12 is connected with the outfan of laser instrument 11, and the second end and first optical fiber 13 of the first optical circulator 12 are connected, described direct current light λ produced by laser instrument 110It is transferred to the first optical fiber 13.3rd end of the first optical circulator 12 is connected with the input of image intensifer 14, the described first sub-light wave λ formed by the first optical fiber 131It is transferred to image intensifer 14.
First end of the second optical circulator 15 is connected with the outfan of image intensifer 14, second end and second optical fiber 16 of the second optical circulator 15 are connected, the second optical fiber 16 is given by the optical signal transmission after image intensifer 14 processing and amplifying, 3rd end of the second optical circulator 15 is connected with next image intensifer, gives next image intensifer by the described second sub-light wave transmissions of formation in the second optical fiber 16.
Second optical fiber 16 is connected with photomodulator 17, for being excited by SBS by the optical signal after image intensifer 14 processing and amplifying, forms light carrier and the second sub-light wave λ of reverse transfer2, and described light carrier is transferred to photomodulator 17.Wherein, described second sub-light wave λ2Be more than the optical signal of SBS threshold for luminous power in the optical signal after described processing and amplifying, described light carrier is the optical signal that in the optical signal after described processing and amplifying, luminous power is less than SBS threshold.The light carrier formed in second optical fiber 16 and the first sub-light wave λ1Between without frequency difference, the second sub-light wave λ formed in the second optical fiber 162With the first sub-light wave λ1Frequency difference be △ f.
Photomodulator 17, is connected with the second optical fiber 16 and wave multiplexer 18, forms flashlight, and be transferred to wave multiplexer 18 after being modulated by the downstream electrical signals of the described light carrier formed in the second optical fiber 16 with input.
Wave multiplexer 18, is connected with the first optical fiber 13 and photomodulator 17, and the photosynthetic wave signal that local oscillator light and the photomodulator 17 for being formed by the first optical fiber 13 is formed forms light many bands multiplexed signals and exports, and is transmitted to beam splitter 2 by trunk optical fiber 5.Light many bands multiplexed signals branch is given each optical network unit 3 by beam splitter 2.It is to say, the flashlight that each second sub-light wave is formed enters into optical fiber and beam splitter 2 by wave multiplexer 18, eventually arrive at each optical network unit 3.
Next sub-light wave that frequency difference is △ f is formed it should be noted that excited by SBS again after the embodiment of the present invention can carry out light amplification process to the sub-light wave of the reverse transfer formed in the optical fiber of each road.As shown in FIG., second sub-light wave of the reverse transfer that the second optical fiber 16 is formed can be connected with next image intensifer by the second optical circulator 15, this next one image intensifer is connected with next second optical fiber by next optical circulator, and this next second optical fiber is connected with next photomodulator.The like, can be excited by SBS and can be sequentially generated sub-light wave λ4、λ5、λn.Frequency difference between all adjacent two sub-light waves is all △ f.As such, it is possible to produce multiple light carrier, multiple different downstream electrical signals from input can form multiple flashlight after being modulated respectively, and close ripple through wave multiplexer 18 and form light many bands multiplexed signals.
So, all signals of telecommunication issued, all in the base band transmission that optical channel performance is best, modulate sub-light wave λ respectively by photomodulator1、λ2、..λnOn.Direct current light λ0On do not modulate data, be issued to each optical network unit 3 as local oscillator light, in order to carry out from coherent reception, produce electricity multi-band signal.So, defining area of light many bands frequency-division multiplex singal on optical line terminal, the most all signals of telecommunication, all in base band, rely on and multiple are separated by fixing sub-light wave to carry different base electrical signal.
Optical network unit 3 includes: photelectric receiver 31, band filter 32 and demodulator 33.
Photelectric receiver 31 is for receiving light many bands multiplexed signals that optical line terminal 1 sends.Wherein, light many bands multiplexed signals includes local oscillator light and multiple flashlight, and each flashlight carries out relevant mixing respectively with local oscillator light, obtains electric many bands multiplexed signals.
Band filter 32 carries out bandpass filtering for the described electricity many bands multiplexed signals obtaining photelectric receiver 31, obtains the signal of telecommunication of required frequency range, and transmits and be demodulated to demodulator 33, obtains the downstream signal that optical line terminal 1 receives.
Direct current light λ0As the local oscillator light of descending coherent reception, produce relevant mixing at photelectric receiver 31.Owing to local oscillator light sends with downstream signal, with signal, there is identical polarization state, be also called from coherent reception method.Through photelectric receiver 31, after each flashlight carries out relevant mixing respectively with described local oscillator light, obtain electric many bands multiplexed signals.Light many bands multiplexed signals as shown in Figure 2 a includes multiple flashlights that multiple spectrally wavelength frequency difference is △ f, each flashlight △ f is the least, is usually no more than 10GHz, after relevant mixing, obtain being spaced apart multiple signals of telecommunication of △ f in electricity frequency spectrum upper frequency, as shown in Figure 2 b.Again after band filter 32 filters, obtain the signal of telecommunication of certain frequency range, as shown in Figure 2 c, obtain the intermediate frequency signal of telecommunication at 2 △ f, can be demodulated obtaining the downstream signal that optical line terminal 1 receives according to existing mode by demodulator 33.This avoid the various deteriorations when signal of telecommunication transmits in a fiber.Optical network unit 3 only needs electricity consumption band filter (BPF) to leach oneself required band to be demodulated, greatly reduce the complexity of optical network unit, power consumption and cost.
The embodiment of the present invention proposes the passive optical network of a kind of area of light many bands multiplexing, optical fiber stimulated Brillouin scattering (SBS) is utilized to produce many sub-light waves, each subband transmits in the way of base band on each light carrier, i.e. it is transmitted in the base band that optical fiber and radio-frequency devices transmission performance are best, the high frequency attenuation that fibre-optical dispersion can be overcome to cause, overcomes that various photoelectric device is not enough in the frequency response of high frequency treatment, roll-offs.It is additionally, since frequency interval between each optical wavelength of generation stable, not the impact of Stimulated Light device wavelength dither, the sub-light wave that frequency interval is the narrowest can be produced, precision is high, and each optical wavelength polarization state is consistent, it is ensured that the mixing that is concerned with completely in receiving obtains electric many bands multiplexed signals.Meanwhile, when PD receives, reduce the non-linear frequency mixing noise of intersubband.Owing to the power of local oscillator light is higher, also improve receiving sensitivity.
It addition, for having deployed substantial amounts of optical network unit 3 and Optical Distribution Network at present.During network upgrade, Optical Distribution Network ODN can remain stationary as.That optical network unit 2 region be directly facing is end user, in escalation process, needs to keep cost to have enough advantages, when keeping ODN motionless, existing optical network system based on beam splitter splitter can be carried out smooth upgrade.
Embodiment two
Present invention can also apply to wavelength-division multiplex in relevant passive optical network.
Fig. 3 is the structural representation of the optical network system that the present embodiment provides, as it is shown on figure 3, the optical network system of the present invention includes: multiple optical line terminals 1, multiple optical network unit 3, array waveguide grating (AWG) 61, array waveguide grating 62 and the optical fiber 4 for connection.The array waveguide grating 61 being connected with multiple optical line terminals 1 is connected with array waveguide grating 62 by trunk optical fiber 5, and array waveguide grating 62 is connected with multiple optical network units 3.
The internal structure of each optical line terminal 1 is identical with the optical line terminal 1 in embodiment one, and each optical network unit 3 is identical with the optical network unit 3 in embodiment one, and concrete processing procedure is the most identical, repeats no more in this.
Multiple optical line terminals 1 are connected with array waveguide grating 61 by optical fiber 4, the input of array waveguide grating 61 is connected with the wave multiplexer 13 of multiple optical line terminals 1, is compound in single optical fiber for the light many bands multiplexed signals transmitted by multiple optical line terminals 1.Multiple optical network units 3 are connected with array waveguide grating 62 by optical fiber 4, multiple outfans of array waveguide grating 62 are connected with the photelectric receiver 31 of optical network unit 3 respectively, make optical network unit 3 receive, by array waveguide grating 62, light many bands multiplexed signals that optical line terminal sends.
The optical wavelength that the direct current light produced launched by the laser instrument of each optical line terminal 1 is different, and the frequency difference of the optical wavelength of two optical line terminal 1 generations is typically much deeper than same laser instrument by the frequency difference △ f between the SBS principle sub-light wave of generation, generally speaking, △ f is less than 10GHz, and the frequency difference of the optical wavelength that the laser instrument of two optical line terminals 1 produces is up to 100GHz.So, then the optical signal of 61 different wave lengths of array waveguide grating can be utilized to synthesize a road and to be transmitted, then by array waveguide grating 62 by the optical signal of different wave length separately.
Embodiment three
Present invention can also apply to beam splitter and in time-division wavelength-division passive optical network that array waveguide grating exists jointly.
Fig. 4 is the structural representation of the optical network system that the present embodiment provides, as shown in Figure 4, the optical network system of the present invention includes: multiple optical line terminals 1, beam splitter 2, multiple optical network unit 3, array waveguide grating 61, array waveguide grating 62 and the optical fiber 4 for connection.
Structure in the present embodiment is similar with embodiment two, difference is, in optical network unit side, after array waveguide grating 62, can also be connected with each optical network unit 3 by beam splitter 2, access user density can be improved, extend and access distance, be suitable for the mode that many office points are merged, with the passive optical network adapting to the time-division, wavelength-division multiplex coexists.
Being above the detailed description carrying out optical network system provided by the present invention, the optical network communication method provided the present invention below is described in detail.
Embodiment four
Fig. 5 is a kind of optical network signal process flow figure that the present embodiment provides, as it is shown in figure 5, in optical line terminal side, the optical network signal processing method of the present invention includes:
The direct current light that S101, laser instrument produce is transmitted in the first optical fiber, is excited by SBS, forms local oscillator light and the first sub-light wave of reverse transfer.
Wherein, described local oscillator light is that in described direct current light, luminous power is less than the optical signal of SBS threshold, and described first sub-light wave is the optical signal that luminous power is more than SBS threshold.Described first sub-light wave is △ f with the frequency difference of the direct current light that described laser instrument produces.
Specifically, the principle of SBS: as the laser λ entered in optical fiber0When luminous power reaches certain value, due to SBS, sub-light wave (Stokes Stockes light wave) λ can be inspired1, λ1Have the following characteristics that 1) λ0With λ1Reversely；2) λ1With λ0There is certain frequency difference △ f, this frequency difference △ f can control；3) λ1With λ0Polarization state is identical；4) if λ1It is again introduced into optical fiber, when power reaches SBS thresholding, can again excite the stokes light λ of next stage time2, λ2With λ1Frequency difference is still △ f；5) SBS can excite in any optical fiber, excites thresholding lower in the highly nonlinear optical fiber (HNF) that nonlinear factor is the highest, and required fiber lengths is the shortest.
S102, described first sub-light wave is carried out optical signal amplification process, and the optical signal after described processing and amplifying is transmitted in the second optical fiber, excited by SBS, forming light carrier and the second sub-light wave of reverse transfer, described light carrier forms flashlight with the downstream electrical signals of input after being modulated.
Wherein, described second sub-light wave is that in the optical signal after described processing and amplifying, luminous power is more than the optical signal of SBS threshold, and described light carrier is the optical signal that in the optical signal after described processing and amplifying, luminous power is less than SBS threshold.Described second sub-light wave is △ f with the frequency difference of described first sub-light wave.
S103, described local oscillator light and described photosynthetic wave signal form light many bands multiplexed signals, and export light many bands multiplexed signals to optical network unit.
Optionally, before light many bands multiplexed signals is exported to optical network unit, also include: light many bands multiplexed signals described in multichannel is combined into a road, send the light many bands multiplexed signals after compound to optical network unit by optical fiber.Specifically, by array waveguide grating by after light many bands multiplexed signals is combined into a road described in multichannel, then optical network unit side can be transferred to by trunk optical fiber, to arrive each optical network unit.
Fig. 6 is another optical network signal process flow figure that the present embodiment provides, and as shown in Figure 6, in optical network unit side, the optical network signal processing method of the present invention includes:
Light many bands multiplexed signals that S201, reception optical line terminal send, described light many bands multiplexed signals includes local oscillator light and multiple flashlight, and described flashlight carries out relevant mixing respectively with described local oscillator light, obtains electric many bands multiplexed signals.
Optical network unit can receive, by beam splitter, light many bands multiplexed signals that optical line terminal sends, it is also possible to receives, by array waveguide grating, light many bands multiplexed signals that optical line terminal sends.
Optionally, receive light many bands multiplexed signals that optical line terminal sends, including:
Receive multiple optical line terminal and send compound light many bands multiplexed signals, described compound light many bands multiplexed signals is separated, respectively obtains single light many bands multiplexed signals.
S202, described electricity many bands multiplexed signals is carried out bandpass filtering, obtain the signal of telecommunication of required frequency range, and carry out demodulation process and obtain the downstream signal that described optical line terminal receives.
Optical line terminal, optical network unit, optical network system and the signal processing method that the present invention provides, optical fiber stimulated Brillouin scattering SBS is utilized to excite, and obtain, through structure step by step, the light carrier that frequency interval between wavelength is stable, photomodulator is utilized to be modulated loading downstream electrical signals, all subband signals can be made all to be transmitted in the base band that optical fiber and radio-frequency devices transmission performance are best, it is thus possible to the high frequency attenuation overcoming fibre-optical dispersion to cause, overcome that various photoelectric device is not enough in the frequency response of high frequency treatment, roll-off.It is additionally, since frequency interval between each optical wavelength of generation stable, not the impact of Stimulated Light device wavelength dither, the sub-light wave that frequency interval is the narrowest can be produced, precision is high, and each optical wavelength polarization state is consistent, it is ensured that the mixing that is concerned with completely in receiving obtains electric many bands multiplexed signals.Meanwhile, when PD receives, reduce the non-linear frequency mixing noise of intersubband.
Professional should further appreciate that, the unit of each example described in conjunction with the embodiments described herein and algorithm steps, can be with electronic hardware, computer software or the two be implemented in combination in, in order to clearly demonstrate the interchangeability of hardware and software, the most generally describe composition and the step of each example according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use different methods to realize described function to each specifically should being used for, but this realization is it is not considered that beyond the scope of this invention.
The method described in conjunction with the embodiments described herein or the step of algorithm can use the software module that hardware, processor perform, or the combination of the two is implemented.In any other form of storage medium that software module is known in can being placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable ROM, depositor, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (8)
1. an optical line terminal, it is characterised in that described optical line terminal includes: laser instrument, conjunction ripple
Device, image intensifer, photomodulator, the first optical fiber and the second optical fiber；
Described laser instrument, is used for producing direct current light；
Described first optical fiber, is connected with described laser instrument and described wave multiplexer, for by described laser instrument
The described direct current light produced excites by stimulated Brillouin scattering SBS, formation local oscillator light and reverse transfer
First sub-light wave, and give described wave multiplexer by described local oscillator optical transport；Wherein, described local oscillator light is described
In direct current light, luminous power is less than the optical signal of SBS threshold, and described first sub-light wave is light in described direct current light
Power is more than the optical signal of SBS threshold；
Described image intensifer, is connected with described first optical fiber and described second optical fiber, for described the
One sub-light wave carries out optical signal amplification process, and the optical signal transmission after described processing and amplifying is given described the
Two optical fiber；
Described second optical fiber, is connected with described image intensifer and described photomodulator, for by described light
Optical signal after amplifier processing and amplifying is excited by SBS, forms the second son of light carrier and reverse transfer
Light wave, and described light carrier is transferred to described photomodulator；Wherein, described second sub-light wave is described
In optical signal after processing and amplifying, luminous power is more than the optical signal of SBS threshold, described light carrier be described in put
In optical signal after big process, luminous power is less than the optical signal of SBS threshold；
Described photomodulator, is connected with described second optical fiber and described wave multiplexer, for being carried by described light
The downstream electrical signals of ripple and input forms flashlight after being modulated, and is transferred to described wave multiplexer；
Described wave multiplexer, is connected with described first optical fiber and described photomodulator, for by described first
The photosynthetic wave signal that the local oscillator light that optical fiber is formed is formed with described photomodulator forms light many bands multiplexed signals also
Output.
Optical line terminal the most according to claim 1, it is characterised in that described first optical fiber passes through
First optical circulator is connected with described laser instrument, the first end of described first optical circulator and described laser
The outfan of device is connected, and the second end of described first optical circulator is connected with described first optical fiber, will
The described direct current light that described laser instrument produces is transferred to described first optical fiber, the of described first optical circulator
Three ends are connected with the input of described image intensifer, the described first sub-light formed by described first optical fiber
Ripple is transferred to described image intensifer.
Optical line terminal the most according to claim 1, it is characterised in that described image intensifer passes through
Second optical circulator is connected with described second optical fiber, the first end of described second optical circulator and described light
The outfan of amplifier is connected, and the second end of described second optical circulator is connected with described second optical fiber,
Optical signal transmission after described image intensifer processing and amplifying is given described second optical fiber, described second light annular
3rd end image intensifer described with the next one of device is connected, described the will formed in described second optical fiber
Two sub-light wave transmissions give next described image intensifer.
Optical line terminal the most according to claim 1, it is characterised in that shape in described first optical fiber
The described first sub-light wave become is △ f with the frequency difference of the direct current light that described laser instrument produces, described second optical fiber
The described second sub-light wave of middle formation and the frequency difference of described first sub-light wave are △ f.
5. an optical network system, it is characterised in that described optical network system includes: such as claim 1～
Optical line terminal, optical network unit and Optical Distribution Network described in 4 arbitrary claims；
Described optical network unit includes: photelectric receiver, band filter and demodulator；
Described photelectric receiver, for receiving light many bands multiplexed signals that described optical line terminal sends, institute
State light many bands multiplexed signals and include local oscillator light and multiple flashlight, described flashlight respectively with described local oscillator light
Carry out relevant mixing, obtain electric many bands multiplexed signals；
Described band filter, enters for the described electricity many bands multiplexed signals obtaining described photelectric receiver
Row bandpass filtering, obtains the signal of telecommunication of required frequency range, and transmission to described demodulator is demodulated；
Described optical line terminal is connected with described optical network unit by described Optical Distribution Network.
6. an optical network signal processing method, it is characterised in that described method includes:
The direct current light that laser instrument produces is transmitted in the first optical fiber, is excited by stimulated Brillouin scattering SBS,
Form local oscillator light and the first sub-light wave of reverse transfer；Wherein, described local oscillator light is light in described direct current light
Power is less than the optical signal of SBS threshold, and described first sub-light wave is the light letter that luminous power is more than SBS threshold
Number；
Described first sub-light wave is carried out optical signal amplification process, and by the optical signal after described processing and amplifying
Second optical fiber transmits, is excited by SBS, form light carrier and the second sub-light wave of reverse transfer；
Wherein, in the optical signal after described second sub-light wave is described processing and amplifying, luminous power is more than SBS threshold
Optical signal, described light carrier is the light that in the optical signal after described processing and amplifying, luminous power is less than SBS threshold
Signal, described light carrier forms flashlight with the downstream electrical signals of input after being modulated；
Described local oscillator light and described photosynthetic wave signal form light many bands multiplexed signals, and light many bands multiplexing are believed
Number output to optical network unit.
Method the most according to claim 6, it is characterised in that described first sub-light wave swashs with described
The frequency difference of the direct current light that light device produces is △ f, and described second sub-light wave with the frequency difference of described first sub-light wave is
△f。
Method the most according to claim 6, it is characterised in that described by defeated for light many bands multiplexed signals
Before going out to optical network unit, also include: light many bands multiplexed signals described in multichannel is combined into a road, will
Light many bands multiplexed signals after Fu He sends optical network unit to by optical fiber.
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| PCT/CN2013/077699 WO2014201700A1 (en) | 2013-06-21 | 2013-06-21 | Optical line terminal, optical network unit, optical network system and signal processing method |
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| EP3288195B1 (en) * | 2016-08-22 | 2019-04-24 | Mitsubishi Electric R&D Centre Europe B.V. | Process for detecting a detuning at a wavelength splitter in an optical fibre transmission network |
| CN110868258B (en) | 2018-08-27 | 2022-08-16 | 中兴通讯股份有限公司 | Device, system and method for realizing coherent detection |
| WO2020069648A1 (en) * | 2018-10-02 | 2020-04-09 | Huawei Technologies Co., Ltd. | Transceiving with a predetermined frequency spacing |
| CN115333640B (en) * | 2022-08-12 | 2024-01-16 | 武汉邮电科学研究院有限公司 | Coherent passive optical network receiver and method and device for expanding dynamic range of coherent passive optical network receiver |
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| EP1465359A2 (en) * | 2003-03-31 | 2004-10-06 | Fujitsu Limited | Detection of disconnection in an optical transmission line |
| CN101247180A (en) * | 2008-03-18 | 2008-08-20 | 浙江大学 | Microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering |
| CN102075478A (en) * | 2009-11-24 | 2011-05-25 | 华为技术有限公司 | Signal processing method, equipment and system for passive optical network (PON) |
| CN102237977A (en) * | 2011-07-05 | 2011-11-09 | 北京大学 | Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system |
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| CN101389148B (en) * | 2008-10-29 | 2012-06-13 | 上海大学 | Uplink downlink construction for radio frequency optical fiber transmission system and method for providing light carrier to uplink |
| US20120219285A1 (en) * | 2011-02-28 | 2012-08-30 | David Jimmy Dahan | In-band optical signal to noise ratio monitoring technique |
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|---|---|---|---|---|
| EP1465359A2 (en) * | 2003-03-31 | 2004-10-06 | Fujitsu Limited | Detection of disconnection in an optical transmission line |
| CN101247180A (en) * | 2008-03-18 | 2008-08-20 | 浙江大学 | Microwave signal frequency translation method and device based on optical fiber stimulated Brillouin scattering |
| CN102075478A (en) * | 2009-11-24 | 2011-05-25 | 华为技术有限公司 | Signal processing method, equipment and system for passive optical network (PON) |
| CN102237977A (en) * | 2011-07-05 | 2011-11-09 | 北京大学 | Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system |
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