CN103733547A - Optical line terminal, optical network unit, optical network system and signal processing method - Google Patents
Optical line terminal, optical network unit, optical network system and signal processing method Download PDFInfo
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- CN103733547A CN103733547A CN201380001486.4A CN201380001486A CN103733547A CN 103733547 A CN103733547 A CN 103733547A CN 201380001486 A CN201380001486 A CN 201380001486A CN 103733547 A CN103733547 A CN 103733547A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The invention relates to an optical line terminal, an optical network unit, an optical network system and a signal processing method. The optical line terminal comprises a laser machine, a combiner, an optical amplifier, an optical modulator, a first optical fiber, and a second optical fiber. The first optical fiber is used for conducting stimulated brillouin scattering (SBS) on straight light, forming local polarized light and reversely-transmitted first sub-optical wave, and transmitting the local polarized light to the combiner. The second optical fiber is used for conducting stimulated brillouin scattering (SBS) on an optical signal amplified by the optical amplifier, forming a photocarrier and a reversely-transmitted second sub-optical wave, and transmitting the photocarrier to the optical modulator. The combiner is used for combining the local polarized light formed by the first optical fiber and the signal formed by the optical modulator to form an optical multi-band multiplexed signal for output. The invention can overcome high-frequency actuation caused by optical fiber dispersion, and overcome insufficient frequency response and roll-off of various photoelectric devices at high frequency.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of optical line terminal, optical network unit, optical network system and signal processing method.
Background technology
EPON (Passive Optical Network, PON) be a kind of light access technology of point-to-multipoint, in broadband access field, become gradually mainstream technology, along with various broadband services, 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 facing the future, needs larger bandwidth, long distance, large branch.
Most PON is based on timesharing multiple access (Time Division Multiple Address, TDMA) mode, typical PON system comprises optical line terminal (Optical Line Terminal, OLT), beam splitter (Splitter), optical network unit (Optical Network Unit, ONU), wherein, beam splitter and trunk optical fiber form Optical Distribution Network (Optical Distribution Network, ODN), a plurality of optical network units are connected to beam splitter by optical fiber, after converging, by trunk optical fiber, be connected to optical line terminal (local side).Optical network unit is shared trunk optical fiber by TDMA mode.
Existing optical network system adopts multi-band frequency division multiplexing (Multi Band Frequency Division Multiplexing mostly, multi-band FDM) technology, transmitting terminal (being optical line terminal) produces multi-band FDM signal in electric territory, utilize bit loading algorithm, at the less bit of ropy transmission, close ropy channel, carry out multi-band transmission (Multi Band Transmission), can make full use of bandwidth.
Yet, this electric multi-band FDM mode needs higher radio-frequency devices bandwidth, such radio-frequency devices exists frequency to roll-off, and then cause radio-frequency devices serious at high frequency treatment performance degradation, even if electric multi-band FDM need to adopt complicated channel estimating and bit loading algorithm, still have a lot of HFSs because frequency decay is serious, cannot be utilized, also very high to the requirement of optical filter.
Summary of the invention
The object of this invention is to provide a kind of optical line terminal, optical network unit, optical network system and signal processing method, at optical fiber and the best base band of radio-frequency devices transmission performance, transmit, can overcome the high frequency attenuation that optical fiber dispersion causes, overcome various photoelectric devices not enough in the frequency response of high frequency treatment, roll-off.
For achieving the above object, first aspect present invention provides a kind of optical line terminal, and described optical line terminal comprises: laser, wave multiplexer, image intensifer, optical modulator, the first optical fiber and the second optical fiber;
Described laser, for generation of direct current light;
Described the first optical fiber, be connected with described wave multiplexer with described laser, for the described direct current light that described laser is produced, by stimulated Brillouin scattering SBS, excite, form the first sub-light wave of local oscillator light and reverse transfer, and described local oscillator light is transferred to described wave multiplexer; Wherein, described local oscillator light is the light signal that in described direct current light, luminous power is less than SBS threshold value, and described the first sub-light wave is the light signal that in described direct current light, luminous power is greater than SBS threshold value;
Described image intensifer, is connected with described the second optical fiber with described the first optical fiber, and for described the first sub-light wave is carried out to optical signal amplification processing, and the optical signal transmission after described amplification is processed is to described the second optical fiber;
Described the second optical fiber, be connected with described optical modulator with described image intensifer, for the light signal that described image intensifer is amplified after processing, by SBS, excite, form the second sub-light wave of light carrier and reverse transfer, and described light carrier is transferred to described optical modulator; Wherein, described the second sub-light wave is the light signal that in the light signal after described amplification is processed, luminous power is greater than SBS threshold value, and described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value;
Described optical modulator, is connected with described wave multiplexer with described the second optical fiber, for the downlink electrical signal of described light carrier and input is modulated to rear formation flashlight, and is transferred to described wave multiplexer;
Described wave multiplexer, is connected with described optical modulator with described the first optical fiber, for the photosynthetic wave signal of the local oscillator light of described the first optical fiber formation and the formation of described optical modulator is formed to light multi-band multiplexed signals output.
In conjunction with first aspect, in the possible execution mode of the first of first aspect, described the first optical fiber is connected with described laser by the first optical circulator, the first end of described the first optical circulator is connected with the output of described laser, the second end of described the first optical circulator is connected with described the first optical fiber, the described direct current light that described laser is produced is transferred to described the first optical fiber, the 3rd end of described the first optical circulator is connected with the input of described image intensifer, described the first sub-light wave transmissions that described the first optical fiber is formed is to described image intensifer.
In conjunction with first aspect, in the possible execution mode of the second of first aspect, described image intensifer is connected with described the second optical fiber by the second optical circulator, the first end of described the second optical circulator is connected with the output of described image intensifer, the second end of described the second optical circulator is connected with described the second optical fiber, optical signal transmission after described image intensifer amplification is processed is to described the second optical fiber, the 3rd end of described the second optical circulator is connected with next described image intensifer, by described the second sub-light wave transmissions forming in described the second optical fiber, give next described image intensifer.
In conjunction with first aspect, in the third possible execution mode of first aspect, the frequency difference of the direct current light that described the first sub-light wave forming in described the first optical fiber and described laser produce is △ f, and described the second sub-light wave forming in described the second optical fiber and the frequency difference of described the first sub-light wave are △ f.
Second aspect, the present invention also provides a kind of optical network unit, and described optical network unit comprises: photelectric receiver, band pass filter and demodulator;
Described photelectric receiver, the light multi-band multiplexed signals sending for receiving optical line terminal, described smooth multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, described flashlight respectively with the mixing that is concerned with of described local oscillator light, obtain electric multi-band multiplexed signals;
Described band pass filter, carries out bandpass filtering for the described electric multi-band multiplexed signals that described photelectric receiver is obtained, and obtains the signal of telecommunication of required frequency range, and transfers to described demodulator and carry out demodulation.
The third aspect, the present invention also provides a kind of optical network system, and described optical network system comprises: 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, the present invention also provides a kind of optical network signal processing method, and described method comprises:
The direct current light that laser produces transmits in the first optical fiber, and by stimulated Brillouin scattering, SBS excites, and forms the first sub-light wave of local oscillator light and reverse transfer; Wherein, described local oscillator light is the light signal that in described direct current light, luminous power is less than SBS threshold value, and described the first sub-light wave is the light signal that luminous power is greater than SBS threshold value;
Described the first sub-light wave is carried out to optical signal amplification processing, and the light signal after described amplification processing is transmitted in the second optical fiber, by SBS, excite, form the second sub-light wave of light carrier and reverse transfer; Wherein, described the second sub-light wave is the light signal that in the light signal after described amplification is processed, luminous power is greater than SBS threshold value, described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value, and described light carrier is for modulating rear formation flashlight with the downlink electrical signal of input;
Described local oscillator light and described photosynthetic wave signal form light multi-band multiplexed signals, and light multi-band multiplexed signals is exported to optical network unit.
In conjunction with fourth aspect, in the possible execution mode of the first of fourth aspect, the frequency difference of the direct current light that described the first sub-light wave and described laser produce is △ f, and the frequency difference of described the second sub-light wave and described the first sub-light wave is △ f.
In conjunction with fourth aspect, in the possible execution mode of the second of fourth aspect, described light multi-band multiplexed signals is exported to optical network unit before, also comprise: light multi-band multiplexed signals described in multichannel is combined into a road, by the light multi-band multiplexed signals after compound, by optical fiber transmission, gives optical network unit.
The 5th aspect, the present invention also provides a kind of optical network signal processing method, and described method comprises:
Receive the light multi-band multiplexed signals that optical line terminal sends, described smooth multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, described flashlight respectively with the mixing that is concerned with of described local oscillator light, obtain electric multi-band multiplexed signals;
Described electric multi-band multiplexed signals is carried out to 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 provided by the invention, optical network unit, optical network system and signal processing method, by SBS, excite and produce the stable light carrier of frequency interval between wavelength, can make all subband signals all at optical fiber and the best base band of radio-frequency devices transmission performance, transmit, thereby can overcome the high frequency attenuation that optical fiber dispersion causes, overcome various photoelectric devices 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;
The light multi-band multiplexed signals schematic diagram that Fig. 2 a exports for the optical line terminal that the embodiment of the present invention one provides;
The electric multi-band multiplexed signals schematic diagram that Fig. 2 b exports for the photelectric receiver that the embodiment of the present invention one provides;
The signal schematic representation that Fig. 2 c exports for the band pass filter that the embodiment of the present invention one provides;
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.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
The downlink mode of passive optical network PON is all to adopt broadcast mode, by beam splitter, by the information distribution of broadcast, gives several user terminals.The optical line terminal that the embodiment of the present invention provides, optical network unit, optical network system and signal processing method, can the compatible existing PON network of having disposed (PON based on beam splitter), be equally applicable to other PON structures, 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 mono-
Fig. 1 is the structural representation of the optical network system that provides of the present embodiment, as shown in Figure 1, optical network system of the present invention comprises: optical line terminal 1, beam splitter 2 and optical network unit 3, a plurality of 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.
Laser 11 is for generation of direct current light.Laser 11 is connected with the first optical fiber 13 by the first optical circulator 12, the direct current light λ of the first optical fiber 13 for laser 11 is produced
0by stimulated Brillouin scattering, SBS excites, and forms the first sub-light wave λ of local oscillator light and reverse transfer
1, the first optical fiber 13 is also connected with wave multiplexer 18, and described local oscillator light is transferred to wave multiplexer 18.Wherein, described local oscillator light is described direct current light λ
0middle luminous power is less than the light signal of SBS threshold value, described the first sub-light wave λ
1for described direct current light λ
0middle luminous power is greater than the light signal of SBS threshold value.The direct current light λ that the local oscillator light forming in the first optical fiber 13 and laser 11 produce
0between without frequency difference, the first sub-light wave λ forming in the first optical fiber 13
1direct current light λ with laser 11 generations
0frequency difference be △ f, and the size of this frequency difference △ f can be controlled.
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 described the first sub-light wave λ that the first optical fiber 13 is formed
1carry out optical signal amplification processing, and the light signal after described amplification is processed 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 output of laser 11, and the second end of the first optical circulator 12 is connected with the first optical fiber 13, the described direct current light λ that laser 11 is produced
0be transferred to the first optical fiber 13.The 3rd end of the first optical circulator 12 is connected with the input of image intensifer 14, described the first sub-light wave λ that the first optical fiber 13 is formed
1be transferred to image intensifer 14.
The first end of the second optical circulator 15 is connected with the output of image intensifer 14, the second end of the second optical circulator 15 is connected with the second optical fiber 16, optical signal transmission after image intensifer 14 amplifications are processed is to the second optical fiber 16, the 3rd end of the second optical circulator 15 is connected with next image intensifer, by described the second sub-light wave transmissions forming in the second optical fiber 16, gives next image intensifer.
The second optical fiber 16 is connected with optical modulator 17, for the light signal that image intensifer 14 is amplified after processing, by SBS, excites, and forms the second sub-light wave λ of light carrier and reverse transfer
2, and described light carrier is transferred to optical modulator 17.Wherein, described the second sub-light wave λ
2for luminous power in the light signal after described amplification processing is greater than the light signal of SBS threshold value, described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value.The light carrier and the first sub-light wave λ that in the second optical fiber 16, form
1between without frequency difference, the second sub-light wave λ forming in the second optical fiber 16
2with the first sub-light wave λ
1frequency difference be △ f.
Optical modulator 17, is connected with wave multiplexer 18 with the second optical fiber 16, for the described light carrier of the second optical fiber 16 formation and the downlink electrical signal of input are modulated to rear formation flashlight, and is transferred to wave multiplexer 18.
Wave multiplexer 18, is connected with optical modulator 17 with the first optical fiber 13, for the photosynthetic wave signal of the local oscillator light of the first optical fiber 13 formation and optical modulator 17 formation is formed to light multi-band multiplexed signals output, by trunk optical fiber 5, transfers to beam splitter 2.Beam splitter 2 is given each optical network unit 3 along separate routes by light multi-band multiplexed signals.That is to say, the flashlight that each second sub-light wave forms enters into optical fiber and beam splitter 2 by wave multiplexer 18, finally arrives each optical network unit 3.
It should be noted that, in the embodiment of the present invention, can carry out by SBS, exciting and forming next sub-light wave that frequency difference is △ f again after light amplification processing to the sub-light wave of the reverse transfer forming in each road optical fiber.As shown in FIG., the second sub-light wave of the reverse transfer that the second optical fiber 16 forms can be connected with next image intensifer by the second optical circulator 15, this next one image intensifer is connected with next the second optical fiber by next optical circulator, and this next one second optical fiber is connected with next optical modulator.The like, can excite and can produce successively sub-light wave λ by SBS
4, λ
5, λ
n.Frequency difference between all adjacent two sub-light waves is all △ f.Like this, can produce a plurality of light carriers, can be respectively modulate a plurality of flashlights of rear formation from a plurality of different downlink electrical signal of input, and through wave multiplexer 18, close ripple and form light multi-band multiplexed signals.
Like this, all signals of telecommunication that issue, all in the best baseband transmission of optical channel performance, are modulated to respectively sub-light wave λ by optical modulator
1, λ
2.. λ
non.Direct current light λ
0on modulating data not, as local oscillator light, be issued to each optical network unit 3, to carry out from coherent reception, produce electric multi-band signal.Like this, formed light territory multi-band frequency-division multiplex singal on optical line terminal, all signals of telecommunication, all in base band, rely on a plurality of fixing sub-light waves of being separated by carry different base electrical signal.
The light multi-band multiplexed signals that photelectric receiver 31 sends for receiving optical line terminal 1.Wherein, light multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, each flashlight respectively with the mixing that is concerned with of local oscillator light, obtain electric multi-band multiplexed signals.
Band pass filter 32 carries out bandpass filtering for the described electric multi-band multiplexed signals that photelectric receiver 31 is obtained, and obtains the signal of telecommunication of required frequency range, and transfers to demodulator 33 and carry out demodulation, obtains the downstream signal that optical line terminal 1 receives.
Direct current light λ
0as the local oscillator light of descending coherent reception, at photelectric receiver 31, produce relevant mixing.Because local oscillator light sends with downstream signal, there is identical polarization state with signal, be called from coherent reception method again.Through photelectric receiver 31, each flashlight is concerned with after mixing with described local oscillator light respectively, obtains electric multi-band multiplexed signals.Light multi-band multiplexed signals as shown in Figure 2 a comprise a plurality of on spectrum wavelength frequency difference be a plurality of flashlights of △ f, each flashlight △ f is conventionally less, is generally no more than 10GHz, after relevant mixing, obtain being spaced apart in electric frequency spectrum upper frequency a plurality of signals of telecommunication of △ f, as shown in Figure 2 b.After band pass filter 32 filtering, obtain the signal of telecommunication of certain frequency range again, as shown in Figure 2 c, obtain intermediate frequency at the signal of telecommunication of 2 △ f, can according to existing mode, carry out demodulation by demodulator 33 and obtain the downstream signal that optical line terminal 1 receives.Various deteriorated while having avoided like this signal of telecommunication to transmit in optical fiber.3 of optical network units need electricity consumption band pass filter (BPF) to leach own needed band to carry out demodulation, greatly reduce complexity, power consumption and the cost of optical network unit.
The embodiment of the present invention proposes the multiplexing passive optical network of a kind of smooth territory multi-band, utilize optical fiber stimulated Brillouin scattering (SBS) to produce a plurality of sub-light waves, each subband transmits on each light carrier in the mode of base band, at optical fiber and the best base band of radio-frequency devices transmission performance, transmit, can overcome the high frequency attenuation that optical fiber dispersion causes, overcome various photoelectric devices not enough in the frequency response of high frequency treatment, roll-off.And, because frequency interval between each optical wavelength producing is stable, Stimulated Light device wavelength effect of jitter not, can produce the very narrow sub-light wave of frequency interval, precision is high, and each optical wavelength polarization state is consistent, guarantees that completely relevant mixing obtains electric multi-band multiplexed signals in receiving.Meanwhile, when PD receives, reduce the non-linear frequency mixing noise of intersubband.Because the power of local oscillator light is higher, also improved receiving sensitivity.
In addition, for having disposed at present a large amount of optical network unit 3 and Optical Distribution Network.In network upgrade process, it is motionless that Optical Distribution Network ODN can keep.Optical network unit 2 directly towards be end user, in escalation process, need to keep cost to there is enough advantages, can, when keeping ODN motionless, to the existing optical network system based on beam splitter splitter, carry out smooth upgrade.
Embodiment bis-
The present invention can also be applied to wavelength division multiplexing in relevant passive optical network.
Fig. 3 is the structural representation of the optical network system that provides of the present embodiment, as shown in Figure 3, optical network system of the present invention comprises: a plurality of optical line terminals 1, a plurality of optical network unit 3, array waveguide grating (AWG) 61, array waveguide grating 62 and optical fiber 4 for being connected.The array waveguide grating 61 being connected with a plurality of optical line terminals 1 is connected with array waveguide grating 62 by trunk optical fiber 5, and array waveguide grating 62 is connected with a plurality of optical network units 3.
The internal structure of each optical line terminal 1 is identical with the optical line terminal 1 in embodiment mono-, and each optical network unit 3 is identical with the optical network unit 3 in embodiment mono-, and concrete processing procedure is also identical, in this, repeats no more.
A plurality of 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 a plurality of optical line terminals 1, for the light multi-band multiplexed signals of a plurality of optical line terminal 1 transmission is compound to single optical fiber.A plurality of optical network units 3 are connected with array waveguide grating 62 by optical fiber 4, a plurality of outputs 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 the light multi-band multiplexed signals that optical line terminal sends.
The optical wavelength of the direct current light that the laser transmitting of each optical line terminal 1 produces is different, and the frequency difference of the optical wavelength of two optical line terminal 1 generations produces the frequency difference △ f between sub-light wave much larger than same laser by SBS principle conventionally, generally speaking, △ f is no more than 10GHz, and the frequency difference of the optical wavelength that the laser of two optical line terminals 1 produces can reach 100GHz.Like this, can utilize array waveguide grating 61 that the synthetic road of the light signal of different wave length is transmitted, then by array waveguide grating 62 by the light signal of different wave length separately.
Embodiment tri-
The present invention can also be applied in beam splitter and the common time-division wavelength-division passive optical network existing of array waveguide grating.
Fig. 4 is the structural representation of the optical network system that provides of the present embodiment, as shown in Figure 4, optical network system of the present invention comprises: a plurality of optical line terminals 1, beam splitter 2, a plurality of optical network unit 3, array waveguide grating 61, array waveguide grating 62 and optical fiber 4 for being connected.
Structure in the present embodiment and embodiment's bis-is similar, 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, can improve access user density, extend access distance, be applicable to the mode that merge many office points, to adapt to the passive optical network that time-division, wavelength division multiplexing coexist.
Be more than the detailed description that optical network system provided by the present invention is carried out, below optical network communication method provided by the invention be described in detail.
Embodiment tetra-
Fig. 5 is a kind of optical network signal process flow figure that the present embodiment provides, and as shown in Figure 5, in optical line terminal side, optical network signal processing method of the present invention comprises:
The direct current light that S101, laser produce transmits in the first optical fiber, by SBS, excites, and forms the first sub-light wave of local oscillator light and reverse transfer.
Wherein, described local oscillator light is the light signal that in described direct current light, luminous power is less than SBS threshold value, and described the first sub-light wave is the light signal that luminous power is greater than SBS threshold value.The frequency difference of the direct current light that described the first sub-light wave and described laser produce is △ f.
Particularly, the principle of SBS: when entering into the laser λ of optical fiber
0when luminous power reaches certain value, due to SBS, can inspire sub-light wave (Stokes Stockes light wave) λ
1, λ
1there is following characteristics: 1) λ
0with λ
1oppositely; 2) λ
1with λ
0have certain frequency difference △ f, this frequency difference △ f can control; 3) λ
1with λ
0polarization state is identical; 4) if λ
1again enter optical fiber, when power reaches SBS thresholding, can again excite the inferior stokes light λ of next stage
2, λ
2with λ
1frequency difference is still △ f; 5) SBS can excite in any optical fiber, in the very high highly nonlinear optical fiber of non linear coefficient (HNF), excites thresholding lower, and required fiber lengths is very short.
S102, described the first sub-light wave is carried out to optical signal amplification processing, and the light signal after described amplification is processed transmits in the second optical fiber, by SBS, excite, form the second sub-light wave of light carrier and reverse transfer, described light carrier is for modulating rear formation flashlight with the downlink electrical signal of input.
Wherein, described the second sub-light wave is the light signal that in the light signal after described amplification is processed, luminous power is greater than SBS threshold value, and described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value.The frequency difference of described the second sub-light wave and described the first sub-light wave is △ f.
S103, described local oscillator light and described photosynthetic wave signal form light multi-band multiplexed signals, and light multi-band multiplexed signals is exported to optical network unit.
Optionally, before light multi-band multiplexed signals is exported to optical network unit, also comprise: light multi-band multiplexed signals described in multichannel is combined into a road, by the light multi-band multiplexed signals after compound, by optical fiber transmission, gives optical network unit.Particularly, can light multi-band multiplexed signals described in multichannel be combined into behind a road by array waveguide grating, then be transferred to optical network unit side 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, optical network signal processing method of the present invention comprises:
S201, receive the light multi-band multiplexed signals that optical line terminal sends, described smooth multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, described flashlight respectively with the mixing that is concerned with of described local oscillator light, obtain electric multi-band multiplexed signals.
Optical network unit can receive the light multi-band multiplexed signals that optical line terminal sends by beam splitter, also can receive the light multi-band multiplexed signals that optical line terminal sends by array waveguide grating.
Optionally, receive the light multi-band multiplexed signals that optical line terminal sends, comprising:
Receive a plurality of optical line terminals and send compound light multi-band multiplexed signals, described compound light multi-band multiplexed signals is carried out to separation, obtain respectively single smooth multi-band multiplexed signals.
S202, described electric multi-band multiplexed signals is carried out to 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 provided by the invention, optical network unit, optical network system and signal processing method, utilize optical fiber stimulated Brillouin scattering SBS to excite, and obtain the stable light carrier of frequency interval between wavelength through structure step by step, utilize optical modulator to modulate and load downlink electrical signal, can make all subband signals all at optical fiber and the best base band of radio-frequency devices transmission performance, transmit, thereby can overcome the high frequency attenuation that optical fiber dispersion causes, overcome various photoelectric devices not enough in the frequency response of high frequency treatment, roll-off.And, because frequency interval between each optical wavelength producing is stable, Stimulated Light device wavelength effect of jitter not, can produce the very narrow sub-light wave of frequency interval, precision is high, and each optical wavelength polarization state is consistent, guarantees that completely relevant mixing obtains electric multi-band multiplexed signals in receiving.Meanwhile, when PD receives, reduce the non-linear frequency mixing noise of intersubband.
Professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an optical line terminal, is characterized in that, described optical line terminal comprises: laser, wave multiplexer, image intensifer, optical modulator, the first optical fiber and the second optical fiber;
Described laser, for generation of direct current light;
Described the first optical fiber, be connected with described wave multiplexer with described laser, for the described direct current light that described laser is produced, by stimulated Brillouin scattering SBS, excite, form the first sub-light wave of local oscillator light and reverse transfer, and described local oscillator light is transferred to described wave multiplexer; Wherein, described local oscillator light is the light signal that in described direct current light, luminous power is less than SBS threshold value, and described the first sub-light wave is the light signal that in described direct current light, luminous power is greater than SBS threshold value;
Described image intensifer, is connected with described the second optical fiber with described the first optical fiber, and for described the first sub-light wave is carried out to optical signal amplification processing, and the optical signal transmission after described amplification is processed is to described the second optical fiber;
Described the second optical fiber, be connected with described optical modulator with described image intensifer, for the light signal that described image intensifer is amplified after processing, by SBS, excite, form the second sub-light wave of light carrier and reverse transfer, and described light carrier is transferred to described optical modulator; Wherein, described the second sub-light wave is the light signal that in the light signal after described amplification is processed, luminous power is greater than SBS threshold value, and described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value;
Described optical modulator, is connected with described wave multiplexer with described the second optical fiber, for the downlink electrical signal of described light carrier and input is modulated to rear formation flashlight, and is transferred to described wave multiplexer;
Described wave multiplexer, is connected with described optical modulator with described the first optical fiber, for the photosynthetic wave signal of the local oscillator light of described the first optical fiber formation and the formation of described optical modulator is formed to light multi-band multiplexed signals output.
2. optical line terminal according to claim 1, it is characterized in that, described the first optical fiber is connected with described laser by the first optical circulator, the first end of described the first optical circulator is connected with the output of described laser, the second end of described the first optical circulator is connected with described the first optical fiber, the described direct current light that described laser is produced is transferred to described the first optical fiber, the 3rd end of described the first optical circulator is connected with the input of described image intensifer, and described the first sub-light wave transmissions that described the first optical fiber is formed is to described image intensifer.
3. optical line terminal according to claim 1, it is characterized in that, described image intensifer is connected with described the second optical fiber by the second optical circulator, the first end of described the second optical circulator is connected with the output of described image intensifer, the second end of described the second optical circulator is connected with described the second optical fiber, optical signal transmission after described image intensifer amplification is processed is to described the second optical fiber, the 3rd end of described the second optical circulator is connected with next described image intensifer, by described the second sub-light wave transmissions forming in described the second optical fiber, give next described image intensifer.
4. optical line terminal according to claim 1, it is characterized in that, the frequency difference of the direct current light that described the first sub-light wave forming in described the first optical fiber and described laser produce is △ f, and described the second sub-light wave forming in described the second optical fiber and the frequency difference of described the first sub-light wave are △ f.
5. an optical network unit, is characterized in that, described optical network unit comprises: photelectric receiver, band pass filter and demodulator;
Described photelectric receiver, the light multi-band multiplexed signals sending for receiving optical line terminal, described smooth multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, described flashlight respectively with the mixing that is concerned with of described local oscillator light, obtain electric multi-band multiplexed signals;
Described band pass filter, carries out bandpass filtering for the described electric multi-band multiplexed signals that described photelectric receiver is obtained, and obtains the signal of telecommunication of required frequency range, and transfers to described demodulator and carry out demodulation.
6. an optical network system, is characterized in that, described optical-fiber network comprises: the optical line terminal as described in claim as arbitrary in claim 1～4, optical network unit as claimed in claim 5 and Optical Distribution Network;
Described optical line terminal is connected with described optical network unit by described Optical Distribution Network.
7. an optical network signal processing method, is characterized in that, described method comprises:
The direct current light that laser produces transmits in the first optical fiber, and by stimulated Brillouin scattering, SBS excites, and forms the first sub-light wave of local oscillator light and reverse transfer; Wherein, described local oscillator light is the light signal that in described direct current light, luminous power is less than SBS threshold value, and described the first sub-light wave is the light signal that luminous power is greater than SBS threshold value;
Described the first sub-light wave is carried out to optical signal amplification processing, and the light signal after described amplification processing is transmitted in the second optical fiber, by SBS, excite, form the second sub-light wave of light carrier and reverse transfer; Wherein, described the second sub-light wave is the light signal that in the light signal after described amplification is processed, luminous power is greater than SBS threshold value, described light carrier is the light signal that in the light signal after described amplification is processed, luminous power is less than SBS threshold value, and described light carrier is for modulating rear formation flashlight with the downlink electrical signal of input;
Described local oscillator light and described photosynthetic wave signal form light multi-band multiplexed signals, and light multi-band multiplexed signals is exported to optical network unit.
8. method according to claim 7, is characterized in that, the frequency difference of the direct current light that described the first sub-light wave and described laser produce is △ f, and the frequency difference of described the second sub-light wave and described the first sub-light wave is △ f.
9. method according to claim 7, it is characterized in that, described light multi-band multiplexed signals is exported to optical network unit before, also comprise: light multi-band multiplexed signals described in multichannel is combined into a road, by the light multi-band multiplexed signals after compound, by optical fiber transmission, gives optical network unit.
10. an optical network signal processing method, is characterized in that, described method comprises:
Receive the light multi-band multiplexed signals that optical line terminal sends, described smooth multi-band multiplexed signals comprises local oscillator light and a plurality of flashlight, described flashlight respectively with the mixing that is concerned with of described local oscillator light, obtain electric multi-band multiplexed signals;
Described electric multi-band multiplexed signals is carried out to 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.
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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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| WO2014201700A1 (en) | 2014-12-24 |
| CN103733547B (en) | 2016-08-31 |
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