CN101989024B - Method and device for transmitting optical signals - Google Patents
Method and device for transmitting optical signals Download PDFInfo
- Publication number
- CN101989024B CN101989024B CN 200910161353 CN200910161353A CN101989024B CN 101989024 B CN101989024 B CN 101989024B CN 200910161353 CN200910161353 CN 200910161353 CN 200910161353 A CN200910161353 A CN 200910161353A CN 101989024 B CN101989024 B CN 101989024B
- Authority
- CN
- China
- Prior art keywords
- light
- ideler frequency
- pattern conversion
- frequency light
- pattern
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The embodiment of the invention provides a method and a device for transmitting optical signals. The method comprises the following steps of: performing positive multiplexing on received signal light and pump light emitted by a laser to generate positive multiplexed light, and performing quasi-phase-matching on the positive multiplexed light to generate a positive light beam containing TM mode converted idle light and TE mode signal light; splitting the positive light beam into pump light, TE mode signal light and TM mode converted idle light; converting the TE mode signal light into TM model signal light, and converting the TM mode converted idle light into TE mode converted idle light; performing negative multiplexing on the pump light, TE mode signal light and TM mode converted idle light to generate negative multiplexed light, and performing quasi-phase-matching on the negative multiplexed light to generate a negative light beam containing TM mode converted idle light and TE mode converted idle light; and splitting the negative light beam into pump light, TE mode converted idle light and TM mode converted idle light. The technical scheme has the advantages of stable system and simple light path structure.
Description
Technical field
The present invention relates to optical communication technique, relate in particular to a kind of transmission method and device of light signal.
Background technology
In the transmission field of light signal, All-Optical Wavelength Conversion Techniques be on the light territory realization information by the conversion of a wavelength to another wavelength or a plurality of wavelength.All-Optical Wavelength Conversion Techniques commonly used mainly comprises: XGM (XGM, Cross-gain modulation), Cross-phase Modulation (XPM, Cross-phasemodulation), nonlinear optics ring cavity (NOLM, Nonlinear optical loop mirror), the laser gain saturation effect, four-wave mixing (FWM, Four-wave mixing), second order nonlinear effect etc.In these schemes, based on period polarized counter-rotating lithium niobate (PPLN, Periodically Poled LiNbO
3Waveguide) wavelength conversion technology of optical waveguide second order nonlinear effect is with its original advantage, such as fast response time, proper fully transparent to flashlight speed and modulation format, unique multi-wavelength is transfer capability simultaneously, the transfer process noise figure is extremely low etc., is subject in recent years more and more domestic and international researchers' attention.
Figure 1 shows that the synoptic diagram of the transmitting device of the light signal that prior art one provides.Flashlight is adjusted its polarization state by Polarization Controller 5 after amplifier 3 amplifies through in the first photo-coupler 4 accesss to plant, then enters in the PPLN optical waveguide 1.Optoisolator 6 guarantees light one-way transmission along clockwise direction in ring cavity, and 7 pairs of light beams of the second coupling mechanism are coupled.Pump light is produced by the annular cavity laser that comprises the PPLN optical waveguide.The wavelength selector 2 that is comprised of attenuator 8 and wave filter 9 determines the pumping light wavelength.The sharp pump light of penetrating generation is realized in PPLN and the frequency effect, generates and frequency light.With frequency light and flashlight beat effect occurs again, T.G Grammar ideler frequency light.
There is following defective in prior art one: the PPLN optical waveguide in this device adopts the annealing proton exchange to make, and only allows transmission TM pattern, and all light must be converted to the TM pattern through Polarization Controller, and input signal light loses the TE pattern.Therefore, the conversion ideler frequency light of output is relevant with the input signal light polarization, and the performance of system is lower, and conversion efficiency is not high.
Figure 2 shows that the synoptic diagram of the transmitting device of the light signal that prior art two provides.Optical waveguide 2 in this device plates one deck to the high reflection of 0.77 mu m waveband, to the film of the high transmission of 1.55 mu m wavebands at front end face, and rear end face plates one deck to 0.77 μ m and 1.55 μ m film of high transmission all.Flashlight advances in the PPLN optical waveguide 2 by circulator 1 input, pump light is with the pumping of TM mode back, the flashlight Orthogonal Decomposition is TM pattern and TE pattern, in the forward transmission course, the TM pattern of flashlight and satisfied the accurate phase-matching condition of difference frequency by the pump light TM pattern that front end face reflects, difference frequency produces the wavelength conversion ideler frequency light of TM pattern.Flashlight, pump light and conversion ideler frequency light are through lens 3 outputs, through quarter-wave plate 4, only the light of 1.55 mu m wavebands worked, pass through again catoptron 5, this catoptron passes through quarter-wave plate 4 twice to the high transmission of 0.77 mu m waveband, to the high reflection of 1.55 mu m wavebands so be positioned at flashlight and the conversion ideler frequency light of 1.55 mu m wavebands, and 90 ° rotation of polarization state occurs, the TM pattern of flashlight is converted to the TE pattern, and the TE pattern is converted to the TM pattern.The TM pattern conversion ideler frequency light that produces during the forward transmission is converted to the TE pattern, and when reverse transfer, the pump light TM pattern of the TM pattern of flashlight (being originally the TE pattern) and backward pumping satisfies accurate phase-matching condition, difference frequency produces the wavelength conversion ideler frequency light of TM pattern, the conversion ideler frequency light that has simultaneously TM pattern and TE pattern is exported by circulator, realizes the wavelength translation function.
There is following defective in prior art two: what adopt in the device is a series of optical device of lens, wave plate and catoptron, and relatively more difficult on the structure of space optical path, system stability is subjected to the impact of external environment larger, and practicality is not strong; Device need to add the injection of pump light source, has increased cost; What adopt in the device is the PPLN optical waveguide of liquid phase epitaxial method preparation, although can transmit simultaneously TE, the TM pattern, the optical waveguide size of liquid phase epitaxial method preparation is little, and conversion efficiency is subject to certain restrictions.
Summary of the invention
In order to overcome defective of the prior art, the embodiment of the invention proposes a kind of transmission method and device of light signal, is used for solving light path of the prior art and makes up the problem difficult, that system stability is poor, conversion efficiency is not high.
On the one hand, the embodiment of the invention provides a kind of transmission method of light signal, and described method comprises:
Penetrate swash at the pump light of generation with the flashlight of reception carries out the multiplexing generation forward of forward multiplexed optical, described forward multiplexed optical is carried out accurate phase matching, to generate and comprise the forward beam that the TM pattern is changed ideler frequency light and TE mode signal light;
The forward beam of the described TM of comprising pattern conversion ideler frequency light and TE mode signal light is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light;
Described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light;
Described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out inverse multiplexing generate inverse multiplexing light, described inverse multiplexing light is carried out accurate phase matching, generate the backward beam that comprises TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light;
The backward beam of described TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light is resolved into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
On the other hand, the embodiment of the invention also provides a kind of transmitting device of light signal, and described device comprises:
The first multiplexing and demultiplexing unit is used for swashing the pump light of penetrating generation and the flashlight of reception and carries out the multiplexing generation forward of forward multiplexed optical;
Matching unit is used for described forward multiplexed optical is carried out accurate phase matching, generates the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light;
The second multiplexing and demultiplexing unit is used for the forward beam of the described TM of comprising pattern conversion ideler frequency light and TE mode signal light is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light;
The optically-active unit is used for described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light;
The second multiplexing and demultiplexing unit is used for that also described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out inverse multiplexing and generates inverse multiplexing light;
Described matching unit is further used for described inverse multiplexing light is carried out accurate phase matching, generates the backward beam that comprises TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light;
The first multiplexing and demultiplexing unit also is used for the backward beam of the described TM of comprising pattern conversion ideler frequency light and TE pattern conversion ideler frequency light is resolved into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
The beneficial effect of the embodiment of the invention is, has realized TE pattern and the TM pattern automatic synchronization of light by optically-active; Have system stability, light path simple structure, advantage that conversion efficiency is high.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The synoptic diagram of the transmitting device of the light signal that Fig. 1 provides for prior art one;
The synoptic diagram of the transmitting device of the light signal that Fig. 2 provides for prior art two;
The process flow diagram of the transmission method of the light signal that Fig. 3 provides for the embodiment of the invention one;
The synoptic diagram that pump light and the light signal based on the difference frequency second order nonlinear effect that Fig. 4 provides for the embodiment of the invention one carries out accurate phase matching;
Fig. 5 for the embodiment of the invention one provide based on the pump light of the second nonlinear effect of cascade frequency multiplication and difference frequency and the synoptic diagram that light signal carries out accurate phase matching;
Fig. 6 for the embodiment of the invention one provide based on cascade and the synoptic diagram that frequently carries out accurate phase matching with pump light and the light signal of difference frequency Two-orders nonlinear effect;
The process flow diagram of the transmission method of the light signal that Fig. 7 provides for the embodiment of the invention one;
The synoptic diagram of the transmitting device of the light signal that Fig. 8 provides for the embodiment of the invention two;
The Direct Bonding PPLN optical waveguide that Fig. 9 provides for the embodiment of the invention two;
The synoptic diagram of the transmitting device of the light signal that Figure 10 provides for the embodiment of the invention three;
The synoptic diagram of the transmitting device of the light signal that Figure 11 provides for the embodiment of the invention four;
The structural representation of the transmitting device of the light signal that Figure 12 provides for the embodiment of the invention four;
The structural representation of the first multiplexer and demultiplexer that Figure 13 provides for the embodiment of the invention four;
The structural representation of the second multiplexer and demultiplexer that Figure 14 provides for the embodiment of the invention four;
The structural representation of the single wavelength selector that Figure 15 provides for the embodiment of the invention four;
The structural representation of the first multiplexer and demultiplexer that Figure 16 provides for the embodiment of the invention five;
The second multiplexer and demultiplexer that Figure 17 provides for the embodiment of the invention five structural representation;
The structural representation of the dual wavelength selector switch that Figure 18 provides for the embodiment of the invention five.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment one
The embodiment of the invention provides a kind of transmission method of light signal, below in conjunction with accompanying drawing present embodiment is elaborated.
Figure 3 shows that the process flow diagram of the transmission method of the light signal that the embodiment of the invention provides.Described method comprises:
S301: the flashlight and the sharp pump light of penetrating generation that receive are carried out the multiplexing generation forward of forward multiplexed optical, described forward (counterclockwise) multiplexed optical is carried out accurate phase matching, generate the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light;
In the present embodiment, pump light is to produce when penetrating the condition of resonance that produces pump light satisfy swashing.
In the present embodiment, also comprised before step S301: the polarization state of adjusting pump light is exported with the TM pattern.
In the present embodiment, describedly will swash the pump light of penetrating generation and carry out accurate phase matching with the outside flashlight that receives and refer to: along the pump light direction of propagation, periodically flashlight be modulated; Quasi-phase matching is so that the interaction light wave obtains periodic calibration and compensation because of the wave vector mismatch that the propagation constant difference causes, thereby constantly strengthen so that the new light field that nonlinear effect produces can effectively superpose, generate the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light.
Fig. 4 is based on the pump light of difference frequency (DFG, Difference frequency generation) second order nonlinear effect and the synoptic diagram that light signal carries out accurate phase matching.Wherein, pump light and flashlight are inputted simultaneously in the PPLN optical waveguide, and pump light and flashlight satisfy accurate phase-matching condition (Quasi-phaseMatch, QPM), in the PPLN optical waveguide, occur based on the difference frequency nonlinear interaction, produce conversion ideler frequency light, at ω
i=ω
p-ω
sGenerally pump light be positioned at 0.77 mu m waveband, flashlight and conversion ideler frequency light are positioned at 1.55 mu m wavebands.According to conservation of energy principle, pump light, flashlight and conversion ideler frequency light wavelength satisfy following relation:
DFG：1/λ
i＝1/λ
p-1/λ
s。
Wherein, λ
iBe conversion ideler frequency optical wavelength, λ
pBe pump light wavelength, λ
sBe signal light wavelength; ω is the frequency coordinate axle, ω
iBe conversion ideler frequency light frequency, ω
pBe pumping light frequency, ω
sBe the signal light frequency.
Fig. 5 is based on cascade frequency multiplication and difference frequency (cascaded harmonic and difference-frequencygeneration, SHG+DFG)) the pump light of second nonlinear effect and the synoptic diagram that light signal carries out accurate phase matching.Wherein, pump light and flashlight two ripples are inputted simultaneously in the PPLN optical waveguide, and pump light is positioned at the QPM wavelength place of cascade frequency multiplication, the cascade frequency-doubled effect occurs produce frequency doubled light, ω
SH=2 ω
pDFG interaction T.G Grammar ideler frequency light occurs in frequency doubled light and flashlight, at ω
i=ω
SH-ω
sGenerally, flashlight, pump light and conversion ideler frequency light are positioned at 1.5 mu m wavebands, and frequency doubled light is positioned at 0.77 mu m waveband.According to conservation of energy principle, pumping, flashlight, frequency doubled light, conversion ideler frequency light wavelength satisfies following relation:
SHG：1/λ
SH＝2/λ
p；
DFG：1/λ
i＝1/λ
SH-1/λ
s。
Wherein, λ
SHBe frequency doubled light wavelength, λ
pBe pump light wavelength, λ
SBe signal light wavelength, λ
iBe conversion ideler frequency optical wavelength; ω is the frequency coordinate axle, ω
SHBe frequency multiplication light frequency, ω
pBe pumping light frequency, ω
sBe signal light frequency, ω
iBe conversion ideler frequency light frequency.
Fig. 6 is based on cascade and frequency and the pump light of difference frequency (cascaded sum and difference-frequencygeneration, SFG+DFG) Two-orders nonlinear effect and the synoptic diagram that light signal carries out accurate phase matching.Wherein, the first pump light, the second pump light, flashlight three-beam are inputted simultaneously in the PPLN optical waveguide, and the first pump light and second pump light satisfy and the accurate phase-matching condition of (SFG) process frequently, occur and frequently reaction, produce and frequency light ω
SF=ω
P1-ω
P2, meanwhile, flashlight is with interaction obtains changing ideler frequency light ω with frequency light generation difference frequency
i=ω
SF-ω
sGenerally, the first pump light, the second pump light, flashlight and conversion ideler frequency light are positioned at 1.55 mu m waveband places, and light is positioned at 0.77 mu m waveband place frequently.According to conservation of energy principle, flashlight, the first pump light, the second pump light and frequency light and conversion ideler frequency light wavelength satisfy following relational expression:
SFG：1/λ
SF＝1/λ
p1+1/λ
p2；
DFG：1/λ
i＝1/λ
SH-1/λ
s；
SFG+DFG：1/λ
i＝1/λ
p1+1/λ
p2-1/λ
s。
Wherein, λ
P1Be the first pumping light wavelength, λ
P2Be second pumping light wavelength, λ
sBe signal light wavelength, λ
SFFor with frequency light wavelength, λ
iBe conversion ideler frequency light wavelength; ω is the frequency coordinate axis, ω
P1Be the first pumping light frequency, ω
P2Be second pumping light frequency, ω
sBe signal light frequency, ω
SFFor with frequency light frequency, ω
iBe conversion ideler frequency light frequency.
The cited accurate phase matching method of above Fig. 4 to Fig. 6 just illustrates, present embodiment not with this as restriction.
S302: the forward beam of the described TM of comprising pattern conversion ideler frequency light and TE mode signal light is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light;
In the present embodiment, also comprise after step S302: the described pump light that resolves in pump light, TE mode signal light and the TM pattern conversion ideler frequency light is carried out wavelength select, described wavelength is used for transmitting the described flashlight that receives.
In the present embodiment, select also to comprise after the pumping light wavelength: will describedly resolve into pump light, TE mode signal light and TM pattern and change the amplification that gains of pump light in the ideler frequency light.Owing to pump light is carried out the consumption that gain amplifier can be offset pump light, transmits thereby ensure the capacity pump light.
S303: described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light;
In the present embodiment, among the step S303 pattern of light changed by optically-active and realize.
S304: described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out oppositely (clockwise) multiplexing generation inverse multiplexing light, described inverse multiplexing light is carried out accurate phase matching, generate the backward beam that comprises TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light;
S305: the backward beam of described TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light is resolved into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
Figure 7 shows that the process flow diagram of the transmission method of the light signal that another embodiment of the present invention provides.In the present embodiment, as shown in Figure 7, described method also comprises:
S306: TE pattern conversion ideler frequency light and the TM pattern conversion ideler frequency light that decomposites is filtered.
In the present embodiment, because flashlight can not utilize in actual applications fully, causing in the TE pattern conversion ideler frequency light that decomposites and the TM pattern conversion ideler frequency light also residually has a small amount of flashlight, so, filtration herein is that residual a small amount of flashlight is filtered out, and obtains TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
The beneficial effect of the embodiment of the invention is, has realized TE pattern and the TM pattern automatic synchronization of light by optically-active; Need not expensive outside cavity gas laser pump light is provided; Have system stability, light path simple structure, advantage that conversion efficiency is high.
Embodiment two
The embodiment of the invention also provides a kind of transmitting device of light signal, below in conjunction with accompanying drawing present embodiment is elaborated.
Figure 8 shows that the synoptic diagram of transmitting device of the light signal of the embodiment of the invention, described device comprises: the first multiplexing and demultiplexing unit 801, and matching unit 802, the second multiplexing and demultiplexing unit 803, optically-active unit 804, wherein:
The flashlight that the first multiplexing and demultiplexing unit 801 is used for receiving carries out the multiplexing generation forward of forward multiplexed optical with the sharp pump light of penetrating generation, and described forward multiplexed optical is transferred to matching unit 802.
In the present embodiment, pump light is to penetrate generation satisfy swashing to swash when penetrating the condition of resonance that produces pump light.
In the present embodiment, described the first multiplexing and demultiplexing unit 801 can be multiplexer and demultiplexer, and described multiplexer and demultiplexer comprises 3 ports, and wherein, the first port is used for receiving the flashlight from the optical circulator input; The second port is used for receiving swashing penetrates the pump light of generation; The 3rd port is used for and will transfers to matching unit 802 according to the forward multiplexed optical of described flashlight and pump light generation.
In the present embodiment, described matching unit 802 can be the PPLN optical waveguide.Described PPLN optical waveguide can adopt direct key and technology preparation.The PPLN optical waveguide that adopts direct key and technology to prepare has very strong restriction to light field, and the PPLN optical waveguide that adopts direct key and technology to prepare is supported the light transmission of TM, TE pattern simultaneously.The Direct Bonding PPLN optical waveguide that Fig. 9 provides for the embodiment of the invention two, wherein, " 0 " among Fig. 9 is true origin, " x ", " y ", " z " are coordinate axis, and the substrate of this optical waveguide is lithium niobate crystal chip, ducting layer is that Z cuts the period polarized zinc niobate lithium wafer of mixing, and substrate and ducting layer are made by Direct Bonding technique.Be cut into ridged waveguide structure by the diamond scribing again.In fact in example of the present invention, use other optical waveguides that can transmit simultaneously TE and TM pattern also can solve the relevant problem of polarization, but because the PPLN optical waveguide both can be transmitted the TM pattern, can transmit the TE pattern again, and fine to the restriction of flashlight and pump light, light is concentrated in the waveguide to be transmitted, be conducive to improve conversion efficiency, use the PPLN optical waveguide so pay the utmost attention to.Difference frequency reaction occurs in flashlight and pump light in the PPLN optical waveguide, in order to realize effective wavelength conversion, this just requires the polarization cycle Λ of PPLN optical waveguide must satisfy simultaneously accurate phase-matching condition in the difference frequency process.
The second multiplexing and demultiplexing unit 803 is used for receiving the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light from matching unit 802 transmission, and described forward beam is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light transfers to optically-active unit 804.
In the present embodiment, described the second multiplexing and demultiplexing unit 803 can be multiplexer and demultiplexer, described multiplexer and demultiplexer comprises 3 ports, wherein, the first port is used for receiving the described forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light of matching unit 802 inputs, and described forward beam carried out demultiplexing, resolve into pump light, TE mode signal light and TM pattern conversion ideler frequency light; The second port is used for exporting described pump light; The 3rd port is used for exporting conversion ideler frequency light and the TE mode signal light of described TM pattern.
Optically-active unit 804 is used for receiving TE mode signal light and the TM pattern conversion ideler frequency light from 803 transmission of the second multiplexing and demultiplexing unit, and described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light.
In the present embodiment, described optically-active unit 804 is the Faraday unit, for example: the Faraday mirror.Described optically-active unit 804 receives from conversion ideler frequency light and the TE mode signal light of the 3rd port output TM pattern of the second multiplexing and demultiplexing unit 803, described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light.
Described optically-active unit 804 imports TM mode signal light and TE pattern conversion ideler frequency light into described the second multiplexing and demultiplexing unit 802 from the 3rd port of the second multiplexing and demultiplexing unit 803.
Described the second multiplexing and demultiplexing unit 802 is used for that also described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out inverse multiplexing and generates inverse multiplexing light, and described inverse multiplexing light is sent to described matching unit 802 from the first port output of the second multiplexing and demultiplexing unit 803.
Described the first multiplexing and demultiplexing unit 801 also is used for resolving into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.Wherein, the second port of the first multiplexing and demultiplexing unit 801 output pump light, the first port output TM pattern conversion ideler frequency light of the first multiplexing and demultiplexing unit 801 and TE pattern conversion ideler frequency light are to optical circulator.
The beneficial effect of the embodiment of the invention is, uses the optically-active unit to realize TE pattern and the TM pattern automatic synchronization of light; Pump light is swashed by the annular cavity laser that comprises the PPLN optical waveguide penetrates generation, can need not expensive outside cavity gas laser pump light is provided, and the performance of system is provided, and has system stability, light path simple structure, advantage that conversion efficiency is high.
Embodiment three
The embodiment of the invention also provides a kind of transmitting device of light signal, below in conjunction with accompanying drawing present embodiment is elaborated.
Figure 10 shows that the synoptic diagram of transmitting device of the light signal of the embodiment of the invention, the light signal transmission device of present embodiment is except each ingredient that comprises previous embodiment two, also comprise: filter element 805, polarization control module 806 and Optical Amplifier Unit 807, wherein:
In the present embodiment, because flashlight can not utilize in actual applications fully, causing in the TE pattern conversion ideler frequency light that decomposites and the TM pattern conversion ideler frequency light also residually has a small amount of flashlight, so, filtration herein be with: residual a small amount of flashlight filters out, and obtains TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
In the present embodiment, described filter element 805 can be filtrator.
In the present embodiment, described polarization control module 806 can be the polarization controller.
In the present embodiment, described Optical Amplifier Unit 807 can be semiconductor optical amplifier (Semiconductor Optical Amplifier, SOA).Described Optical Amplifier Unit 807 is with the amplification that gains of the described pump light that resolves in pump light, TE mode signal light and the TM pattern conversion ideler frequency light.Owing to pump light is carried out the consumption that gain amplifier can be offset pump light, transmits thereby ensure the capacity pump light.
The beneficial effect of the embodiment of the invention is that pump light is swashed by the annular cavity laser that comprises the PPLN optical waveguide penetrates generation, provides pump light and need not expensive outside cavity gas laser; The polarization control module is adjusted the polarization state of pump light and is exported with the TM pattern; Adopt Optical Amplifier Unit to the pump light amplification that gains, transmit thereby ensure the capacity pump light; Have system stability, light path simple structure, advantage that conversion efficiency is high.
Embodiment four
The embodiment of the invention also provides a kind of transmitting device of light signal, below in conjunction with accompanying drawing present embodiment is elaborated.
Figure 11 shows that the synoptic diagram of the transmitting device of the light signal that the embodiment of the invention provides.The light signal transmission device of present embodiment also comprises except each ingredient that comprises previous embodiment two or embodiment three: wavelength selection unit 808 is used for selecting the pumping light wavelength.
The structural representation of the transmitting device of the light signal that Figure 12 provides for the embodiment of the invention.In the present embodiment, as shown in figure 12,1201 is optical circulator, and flashlight inputs to the first multiplexer and demultiplexer 1202 from described optical circulator.Optically-active unit 803 among Figure 11 is specially Faraday mirror 1205, and the filter unit 805 among Figure 11 is specially wave filter 1209; The first multiplexing and demultiplexing unit 801 among Figure 11 is the first multiplexer and demultiplexer 1202, the first port of the first multiplexer and demultiplexer 1202 is 2-1, the second port of the first multiplexer and demultiplexer 1202 is 2-2, and the 3rd port of the first multiplexer and demultiplexer 1202 is 2-3; Matching unit 802 among Figure 11 is PPLN optical waveguide 1203; The second multiplexing and demultiplexing unit 801 among Figure 11 is the first multiplexer and demultiplexer 1204, the first port of the first multiplexer and demultiplexer 1202 is 2-1, the second port of the second multiplexer and demultiplexer 1204 is 2-2, and the 3rd port of the second multiplexer and demultiplexer 1204 is 2-3; Wavelength selection unit 808 among Figure 11 is wavelength selector 1206; Optical Amplifier Unit 807 among Figure 11 is specially semiconductor optical amplifier 1207; Polarization control module 806 among Figure 11 is specially polarization controller 1208.
In the present embodiment, by the first multiplexer and demultiplexer 1204, PPLN optical waveguide 1203, the second multiplexers and demultiplexers 1204, wavelength selector 1206, semiconductor optical amplifier 1207 and the polarization controller 1208 common annular cavity lasers that form.When described annular cavity laser satisfy to swash when penetrating the condition of resonance that produces pump light, can swash and penetrate the generation pump light.
Figure 13 shows that the structural representation of the first multiplexer and demultiplexer.Described the first multiplexer and demultiplexer 1202 is made of a pair of three light wavelength division multiplexing 13a and one 's a pair of two light wavelength division multiplexing 13b cascade.
Figure 14 shows that the structural representation of the second multiplexer and demultiplexer.Described the second multiplexer and demultiplexer 1204 is made of a pair of three light wavelength division multiplexing 14a and one 's a pair of two light wavelength division multiplexing 14b cascade.
Figure 15 shows that the structural representation of the wavelength selector that the embodiment of the invention provides.In the present embodiment, wavelength selector 1206 is single wavelength selector, and it is comprised of the first adjustable optical attenuator 15a and the first adjustable filter 15b, and light wave can transmitted in both directions in single wavelength selector.The wavelength of the first adjustable filter 15b in order to need to select, for example, select the light of output wavelength in the present embodiment, the first adjustable attenuator 15a chooses wavelength to swash the luminous power of penetrating pump light to penetrating loss and then the control of light in ring cavity in order to suitable adjusting, and the position of adjustable optical attenuator 15a and adjustable filter 15b can exchange.
The beneficial effect of the embodiment of the invention is that pump light is swashed by the annular cavity laser that comprises the PPLN optical waveguide penetrates generation, provides pump light and need not expensive outside cavity gas laser; The polarization control module is adjusted the polarization state of pump light and is exported with the TM pattern; The amplification that gains of described Optical Amplifier Unit pump light; By using single wavelength selector the pumping light wavelength is selected; Have system stability, light path simple structure, advantage that conversion efficiency is high.
Embodiment five
The embodiment of the invention also provides a kind of transmitting device of light signal, below in conjunction with accompanying drawing present embodiment is elaborated.
The composition of the transmitting device of the light signal of present embodiment and embodiment four is basic identical, and different is that in the present embodiment, the wavelength selection unit 808 among Figure 11 is dual wavelength selector switch 1206.
The structural representation of the wavelength selector that provides for the embodiment of the invention as shown in figure 16.In parallel again after two groups of adjustable optical attenuator 16a and the adjustable filter 16b series connection, be composed in series the multi-wavelength selector switch with coupling mechanism 16c again.Adjustable attenuator 16a chooses wavelength to swash the luminous power of penetrating pump light to penetrating loss and then the control of light in ring cavity in order to suitable adjusting, and the position of adjustable optical attenuator 16a and adjustable filter 16b can exchange.
In addition, owing to adopted the dual wavelength selector switch, the first multiplexing and demultiplexing unit has following different in realization with the second multiplexing and demultiplexing unit.
Figure 17 shows that the structural representation of the first multiplexer and demultiplexer.Described the first multiplexer and demultiplexer 1202 is made of one a pair of four light wavelength division multiplexing 17a and two a pair of two light wavelength division multiplexing 17b cascade.The first port of the first multiplexer and demultiplexer 1202 is 2-1, and the second port of the first multiplexer and demultiplexer 1202 is 2-2, and the 3rd port of the first multiplexer and demultiplexer 1202 is 2-3.
Figure 18 shows that the structural representation of the second multiplexer and demultiplexer.Described the second multiplexer and demultiplexer 1204 is made of one a pair of four light wavelength division multiplexing 18a and two a pair of two light wavelength division multiplexing 18b cascade.
The beneficial effect of the embodiment of the invention is that pump light is swashed by the annular cavity laser that comprises the PPLN optical waveguide penetrates generation, provides pump light and need not expensive outside cavity gas laser; The polarization control module is adjusted the polarization state of pump light and is exported with the TM pattern; The amplification that gains of described Optical Amplifier Unit pump light; By using the dual wavelength selector switch pumping light wavelength is selected; Have system stability, light path simple structure, advantage that conversion efficiency is high.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, the technical scheme of the embodiment of the invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the synoptic diagram of a preferred embodiment, the unit in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the unit in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.A unit can be merged in the unit of above-described embodiment, also can further split into a plurality of subelements.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
Above embodiment is the preferred embodiments of the disclosure, and the common variation that the those skilled in the art carries out in the technical scheme of the embodiment of the invention, change or replacement all should be included within protection scope of the present invention.
Claims (11)
1. the transmission method of a light signal is characterized in that, described method comprises:
The flashlight that receives is carried out the multiplexing generation forward of forward multiplexed optical with the sharp pump light of penetrating generation, described forward multiplexed optical is carried out accurate phase matching, generate the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light;
The forward beam of the described TM of comprising pattern conversion ideler frequency light and TE mode signal light is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light;
Described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light;
Described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out inverse multiplexing generate inverse multiplexing light, described inverse multiplexing light is carried out accurate phase matching, generate the backward beam that comprises TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light;
The backward beam of described TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light is resolved into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
2. method according to claim 1 is characterized in that, described method also comprises: TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light that described backward beam is decomposited filter.
3. method according to claim 1 is characterized in that, described method also comprises: the polarization state of adjusting pump light is exported with the TM pattern.
4. method according to claim 1 is characterized in that, described method also comprises: with the amplification that gains of the described pump light that resolves in pump light, TE mode signal light and the TM pattern conversion ideler frequency light.
5. method according to claim 1 is characterized in that, described method also comprises: select the pumping light wavelength, described wavelength is used for transmitting the described flashlight that receives.
6. the transmitting device of a light signal is characterized in that, comprising:
The first multiplexing and demultiplexing unit, the flashlight that is used for receiving carries out the multiplexing generation forward of forward multiplexed optical with the sharp pump light of penetrating generation;
Matching unit is used for described forward multiplexed optical is carried out accurate phase matching, generates the forward beam that comprises TM pattern conversion ideler frequency light and TE mode signal light;
The second multiplexing and demultiplexing unit is used for the forward beam of the described TM of comprising pattern conversion ideler frequency light and TE mode signal light is resolved into pump light, TE mode signal light and TM pattern conversion ideler frequency light;
The optically-active unit is used for described TE mode signal light is converted to TM mode signal light, and described TM pattern conversion ideler frequency light is converted to TE pattern conversion ideler frequency light;
The second multiplexing and demultiplexing unit is used for that also described pump light, TM mode signal light and TE pattern conversion ideler frequency light are carried out inverse multiplexing and generates inverse multiplexing light;
Described matching unit is further used for described inverse multiplexing light is carried out accurate phase matching, generates the backward beam that comprises TM pattern conversion ideler frequency light and TE pattern conversion ideler frequency light;
The first multiplexing and demultiplexing unit also is used for the backward beam of the described TM of comprising pattern conversion ideler frequency light and TE pattern conversion ideler frequency light is resolved into pump light, TE pattern conversion ideler frequency light and TM pattern conversion ideler frequency light.
7. device according to claim 6 is characterized in that, described device also comprises: filter element, the TE pattern conversion ideler frequency light and the TM pattern conversion ideler frequency light that are used for described backward beam is decomposited filter.
8. device according to claim 6 is characterized in that, described device also comprises: the polarization control module, the polarization state that is used for the adjustment pump light is exported with the TM pattern.
9. device according to claim 6 is characterized in that, described device also comprises: Optical Amplifier Unit is used for the pump light that described the second multiplexing and demultiplexing unit decomposition the goes out amplification that gains.
10. device according to claim 6 is characterized in that, described device also comprises: wavelength selection unit is used for selecting the pumping light wavelength.
11. device according to claim 10 is characterized in that, described wavelength selection unit comprises single wavelength selection unit or dual wavelength selected cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910161353 CN101989024B (en) | 2009-07-31 | 2009-07-31 | Method and device for transmitting optical signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910161353 CN101989024B (en) | 2009-07-31 | 2009-07-31 | Method and device for transmitting optical signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101989024A CN101989024A (en) | 2011-03-23 |
| CN101989024B true CN101989024B (en) | 2013-04-17 |
Family
ID=43745641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910161353 Active CN101989024B (en) | 2009-07-31 | 2009-07-31 | Method and device for transmitting optical signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101989024B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469555B (en) * | 2013-09-13 | 2018-05-18 | 华为技术有限公司 | All-optical information switch and method |
| CN106248637A (en) * | 2016-09-14 | 2016-12-21 | 苏州光讯环境科技有限公司 | A kind of atmospheric transmittance measuring method |
-
2009
- 2009-07-31 CN CN 200910161353 patent/CN101989024B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 孙庆尧.基于铌酸锂的高效偏振无关性波长转换器研究.《华中科技大学硕士学位论文》.2009, * |
| 王健等.新型双环腔结构可调谐全光波长转换器的实验研究.《物理学报》.2007,第56卷(第6期), * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101989024A (en) | 2011-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhang et al. | All optical XOR logic gates: technologies and experiment demonstrations | |
| Yan et al. | All-optical signal processing for ultrahigh speed optical systems and networks | |
| US8345335B2 (en) | All-optical reconfigurable cascadable logic with linear preprocessing by lightwave interference and post-processing by nonlinear phase erasure | |
| CN101592844A (en) | The method for making of all-optical wavelength convertor with tunable non-periodic broadband | |
| CN100364186C (en) | External cavity electrically controlled laser wavelength code input method and biwavelength laser module thereof | |
| Nuccio et al. | λ-conversion of 160-Gbit/s PDM 16-QAM using a single periodically-poled lithium niobate waveguide | |
| Kanter et al. | Wavelength-selective pulsed all-optical switching based on cascaded second-order nonlinearity in a periodically poled lithium-niobate waveguide | |
| CN101989024B (en) | Method and device for transmitting optical signals | |
| Cardakli et al. | Tunable all-optical time-slot-interchange and wavelength conversion using difference-frequency-generation and optical buffers | |
| CN103760732B (en) | A kind of cascade and frequency and difference frequency AOWC and conversion method | |
| Wang et al. | All-optical logic XOR gate for high-speed CSRZ-DPSK signals based on cSFG/DFG in PPLN waveguide | |
| CN102547492B (en) | All-optical information exchange method based on second order nonlinearity | |
| Dagens et al. | SOA-based devices for all-optical signal processing | |
| CN203673195U (en) | Cascading sum frequency and difference frequency all-optical wavelength converter | |
| Cardakli et al. | Wavelength conversion of subcarrier channels using difference frequency generation in a PPLN waveguide | |
| Wu et al. | Simultaneous implementation of all-optical OR and AND logic gates for NRZ/RZ/CSRZ ON–OFF-keying signals | |
| Sartorius et al. | All-optical DPSK wavelength converter based on MZI with integrated SOAs and phase shifters | |
| Tadanaga et al. | A 1-THz optical frequency shifter using quasi-phase-matched LiNbO/sub 3/wavelength converters | |
| Kishimoto et al. | Periodically poled linbo3 ridge waveguide with 21.9 db phase-sensitive gain by optical parametric amplification | |
| Teimoori et al. | All-optical packet-switching decoder design and demonstration at 10 Gb/s | |
| Berrettini et al. | All-Optical 2$\,\times\, $2 Switch Based on Kerr Effect in Highly Nonlinear Fiber for Ultrafast Applications | |
| CN215181206U (en) | High-brightness quantum entanglement light source system | |
| Yu et al. | Polarization-insensitive all-optical wavelength conversion using dispersion-shifted fiber with a fiber Bragg grating and a Faraday rotator mirror | |
| Bogoni et al. | 640 Gb/s all-optical logic functions in a PPLN waveguide | |
| Bogoni et al. | All-optical 160Gb/s half-addition half-subtraction and AND/OR function exploiting pump depletion and nonlinearities in a PPLN waveguide |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |