CN108259091A

CN108259091A - A kind of time-domain filtering installation method and device

Info

Publication number: CN108259091A
Application number: CN201611248519.7A
Authority: CN
Inventors: 陆亮亮; 梁文烨
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2018-07-06
Anticipated expiration: 2036-12-29
Also published as: CN108259091B

Abstract

The present embodiments relate to the communications field more particularly to a kind of time-domain filtering installation methods and device, are used to implement the phase-modulation of the first flashlight effect unrelated with the polarization of pulse pump light.In the embodiment of the present invention, first time phase-modulation is carried out to the phase of the first flashlight by pulse pump light, the polarization of the first flashlight after progress first time phase-modulation is rotated by 90 °, second of phase-modulation is carried out to the phase for carrying out the first flashlight of first time phase-modulation and polarization rotation by pulse pump light, and rotation will be polarized and carry out the first flashlight of second phase-modulation and be sent to first port without the second signal light of progress phase-modulation.Second of phase-modulation is carried out due to continuing through pulse pump light after the polarization of the first flashlight after progress first time phase-modulation is rotated by 90 °, it is achieved thereby that the effect that the phase-modulation of the first flashlight is unrelated with the polarization of pulse pump light.

Description

A kind of time-domain filtering installation method and device

Technical field

The present embodiments relate to the communications field more particularly to a kind of time-domain filtering installation methods and device.

Background technology

Photoswitch is the device that the optical signal of an optical channel is transformed into another optical channel by certain requirement.Photoswitch It can make directly to be exchanged between light path, be the core devices that All-optical switching is completed in optical-fiber network, with all-optical network market Expand, the research of photoswitch has become all optical communication field focus of attention.

Fig. 1 illustrates a kind of structure diagram of time-domain filtering photoswitch of prior art offer, such as Fig. 1 institutes Show, light beam is entered by port 101 in 3dB photo-couplers 103, which is divided into two after 3dB photo-couplers 103 Beam, from left and right, both direction is entered in Sagnac (Sagnac) ring 104 respectively, i.e., the two-beam be divided into clockwise and It counterclockwise transmits, the light of the two reverse transfers light path in optical fiber is equal always, finally runs after a week simultaneously in 3dB couplings Clutch interferes.If the phase difference of the light of clockwise transmission and the light of counterclockwise transmission is 0, the light beam after interference can edge The direction outgoing of port 101, Sagnac rings play the role of speculum at this time.If the light of clockwise transmission with passing counterclockwise The phase difference of defeated light is π, then the light beam after interfering can be emitted from the direction of port 102.If light and the inverse time of clockwise transmission For the phase difference of the light of needle transmission for 0~π between, port 101 and port 102 will have light outgoing, specific outgoing splitting ratio by Phase difference determines.

It is passed usually in Sagnac rings by a branch of heavy pumping light and clockwise transmission light or counterclockwise in the prior art Cross-phase Modulation occurs for defeated light, so as to generate nonlinear phase shift, make clockwise transmission light and counterclockwise transmission light it Between form phase difference.

But in said program, since nonlinear phase shift is related to polarization, that is to say, that the polarization of pump light can be to up time The phase difference of the light of needle transmission and the light of counterclockwise transmission has an impact, and said program is difficult the nonlinear phase shift by pump light Effect obtains the phase difference of the light of accurate clockwise transmission and the light of counterclockwise transmission.

Invention content

The embodiment of the present invention provides a kind of time-domain filtering installation method and device, is used to implement the phase tune of the first flashlight The system effect unrelated with the polarization of pulse pump light, so as to more be accurately obtained the phase of the first flashlight and second signal light Difference.

The embodiment of the present invention provides a kind of time-domain filtering device, including coupling unit, the processing list being connect with coupling unit Member；The pulse pump light being connect with processing unit generates unit；Coupling unit includes first port and second port.Coupling is single Flashlight for receiving flashlight, and is divided into the first flashlight and second signal light, the first flashlight is sent to processing by member Unit；In the case where the polarization rotation for receiving processing unit transmission and carrying out the first flashlight of second of phase-modulation, The first flashlight for polarizing second of phase-modulation of rotation and progress and the second signal light without carrying out phase-modulation are sent To the first port of coupling unit；In the situation for the first flashlight without carrying out phase-modulation for receiving processing unit transmission Under, no the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation are sent to coupling unit Second port.

Pulse pump light generates unit, and information is indicated for obtaining, according to instruction information generation pulse pump light；It and will be raw Into pulse pump light be sent to processing unit；Processing unit, in the arteries and veins for receiving the generation unit transmission of pulse pump light In the case of rushing pump light, first time phase-modulation is carried out to the phase of the first flashlight by pulse pump light, the will be carried out The polarization of first flashlight of phase-modulation is rotated by 90 °, and obtains carrying out the first of first time phase-modulation and polarization rotation Flashlight carries out second by pulse pump light to the phase for carrying out the first flashlight of first time phase-modulation and polarization rotation Secondary phase-modulation obtains polarization rotation and carries out the first flashlight of second of phase-modulation, and polarization rotation and will carry out the First flashlight of quadratic phase modulation is sent to coupling unit；In the arteries and veins for being not received by the generation unit transmission of pulse pump light In the case of rushing pump light, no the first flashlight for carrying out phase-modulation is sent to coupling unit.

In the embodiment of the present invention, flashlight is divided into the first flashlight and second signal light；According to instruction information generation arteries and veins Rush pump light；In the case where there is pulse pump light, first time phase is carried out to the phase of the first flashlight by pulse pump light The polarization of the first flashlight after progress first time phase-modulation is rotated by 90 ° by position modulation, obtains carrying out first time phase tune System and the first flashlight of polarization rotation, by pulse pump light to the first letter of progress first time phase-modulation and polarization rotation The phase of number light carries out second of phase-modulation, obtains polarization rotation and carries out the first flashlight of second of phase-modulation, and The first flashlight for polarizing second of phase-modulation of rotation and progress and the second signal light without carrying out phase-modulation are sent To first port；In the case of no pulse pump light, carry out no the first flashlight for carrying out phase-modulation and not The second signal light of phase-modulation is sent to second port.Since the first flashlight is carried out first time phase by pulse pump light After the modulation of position, pulse pump is continued through after the polarization of the first flashlight after progress first time phase-modulation is rotated by 90 ° Light has carried out second of phase-modulation, it is achieved thereby that the phase-modulation of the first flashlight is unrelated with the polarization of pulse pump light Effect, so as to more be accurately obtained the phase difference of the first flashlight and second signal light.

Optionally, flashlight is divided into the first flashlight and second signal light, in particular to from work(in the embodiment of the present invention Flashlight is divided into the first flashlight and second signal light in rate.Coupling unit can be 1 × 2 fiber coupler or other energy Enough realize the optical device of distribution or combination of the optical signal power between different optical fiber.Optionally, by coupling unit only to letter The power of number light is allocated, i.e. the power of the first flashlight and second signal light may be the same or different, but the first signal The other parameters all same of light and second signal light, such as the parameters all same such as wavelength, polarization, phase.

Optionally, coupling unit 213 can be the coupler that can realize Two In and Two Out, can play beam splitting to two ways of optical signals With the effect for closing beam and according to the phase difference of two optical signals received, receive two optical signals are closed into beam or are done It is exported after relating to from the corresponding port of coupling unit 213, for example can be 3dB photo-couplers.

Optionally, coupling unit further includes third port and the 4th port；Coupling unit is used for：It is connect by second port Flashlight is received, and flashlight is divided into the first flashlight and second signal light；The first flashlight is sent to by third port Processing unit；Second signal light is sent by the 4th port；Polarization rotation is received by third port and carries out second of phase First flashlight of modulation or the first flashlight without carrying out phase-modulation；It is received by the 4th port without carrying out phase tune The second signal light of system；It is rotated in the polarization that processing unit transmission is received by third port and carries out second of phase-modulation The first flashlight in the case of, will by third port receive polarization rotate and carry out second of phase-modulation first Flashlight and by the 4th port receive without carry out phase-modulation second signal light be sent to the first of coupling unit Port；In the case where receiving the first flashlight without carrying out phase-modulation of processing unit transmission by third port, Do not have the first flashlight without carrying out phase-modulation received by third port and by what the 4th port received The second signal light for carrying out phase-modulation is sent to the second port of coupling unit.

Optionally, coupling unit includes four ports, can receive flashlight by second port 227, can also pass through first Port 226 receives flashlight, is only introduced by taking second port 227 as an example in the embodiment of the present invention.If it is connect with first port 226 Flashlight is received, then time-domain filtering device can play the role of reflection, and the flashlight received is without ovennodulation directly from first end 226 backtrackings of mouth.

Optionally, processing unit includes：The multiplex/demultiplex list being connect with pulse pump light generation unit and coupling unit Member, the media units being connect with multiplex/demultiplex unit, the first Faraday rotation mirror unit being connect with media units；Multiplexing/ Demultiplexing unit, for receive pulse pump light generate unit send pulse pump light in the case of, to pulse pump The first flashlight that light and the coupling unit received are sent is coupled, and obtains the first coupled signal light；First coupling is believed Number light is sent to media units；To the 4th coupled signal Optical Demultiplexing, second of phase-modulation of polarization rotation and progress is obtained First flashlight, and the first flashlight that will polarize second of phase-modulation of rotation and progress is sent to coupling unit；Medium list Member, for making the pulse pump light in the first coupled signal light in media units to the first flashlight in the first coupled signal light Phase carry out first time phase-modulation, obtain carrying out the first flashlight of first time phase-modulation and pulse pump optical coupling Second coupled signal light, and the second coupled signal light is sent to the first Faraday rotation mirror unit；Make third coupled signal light In pulse pump light in media units to carry out first time phase-modulation and polarization rotation the in third coupled signal light The phase of one flashlight carries out second of phase-modulation, obtains the first flashlight for carrying out second of phase-modulation and polarization rotation With the 4th coupled signal light of pulse pump optical coupling, and the 4th coupled signal light is sent to multiplex/demultiplex unit；First Faraday rotation mirror unit, for by the second coupled signal light carry out first time phase-modulation after the first flashlight polarization It is rotated by 90 °, obtains carrying out the first flashlight of first time phase-modulation and polarization rotation and the third coupling of pulse pump optical coupling Close flashlight；Third coupled signal light is sent to media units.

Media units are there are a variety of implementations in the embodiment of the present invention, as long as can make pulse pump light in media units To the generation nonlinear interaction of the first flashlight of the first flashlight and progress first time phase-modulation and polarization rotation, so as to right First flashlight and phase second of the phase-modulation of progress for carrying out first time phase-modulation and the first flashlight of polarization rotation , such as media units can be Ke Er (Kerr) medium, specifically, can be general single mode fiber, photonic crystal fiber, Si-wire waveguide, quantum dot etc. have the medium of third-order non-linear.

In the embodiment of the present invention, since pulse pump light is has some pulses at interval on the time, it is multiplexed/demultiplexes Pulse pump light can be received within a continuous period with unit, and will not be received on continuous next period To pulse pump light.That is, in the embodiment of the present invention in the case of pulse pump light is received, can will polarization rotation and It carries out the first flashlight of second phase-modulation and is exported without carrying out phase-modulation second signal light by first port, this In inventive embodiments in the case of pulse pump light is not received, can there will be the first flashlight for carrying out phase-modulation and not have The second signal light for carrying out phase-modulation is exported by second port, thus can be by the way that time-domain filtering is filled in the embodiment of the present invention The first port put connects the switching function that different devices realizes time-domain filtering device with second port.

Optionally, multiplex/demultiplex unit is additionally operable to：In the pulse for not receiving the generation unit transmission of pulse pump light In the case of pump light, the first flashlight that the coupling unit received is sent is sent to the first faraday by media units Rotate mirror unit；First Faraday rotation mirror unit for the polarization of the receive first flashlight to be rotated by 90 °, is not had There is the first flashlight for carrying out phase-modulation；No the first flashlight for carrying out phase-modulation is passed sequentially through into media units and is answered Coupling unit is sent to/demultiplexing unit.

In the embodiment of the present invention the first faraday rotation mirror to the polarization of the pulse pump light in the second coupled signal light not It is rotated.Optionally, the magneto-optical crystal in the embodiment of the present invention in the first Faraday rotation mirror unit is to the first flashlight The rotational angle of polarization be it is related with the wavelength of the first flashlight, can be by choosing specific magneto-optical crystal and pulse pump light Wavelength so that entire first Faraday rotation mirror unit does not rotate the polarization of pulse pump light, only plays normal mirror Effect, then reflected pulse pump light will continue to that 90 degree postrotational first flashlights occur by medium list with polarization Member, so as to which nonlinear interaction occur, optionally the intensity of nonlinear phase shift and the intensity of pulse pump light are linear.

Further, for the polarization state that the two paths of signals light of arrival coupling unit is made to keep identical, optionally, time domain filter Wave apparatus further includes the second Faraday rotation mirror unit being connect with coupling unit；Second Faraday rotation mirror unit, is used for：It connects The second signal light that coupling unit is sent is received, the polarization of second signal light is rotated by 90 °, is not carried out phase-modulation Second signal light, and by it is no carry out phase-modulation second signal light be sent to coupling unit；Coupling unit is used for： In the case of the polarization rotation for receiving processing unit transmission and the first flashlight for carrying out second of phase-modulation, polarization is revolved Turn and first flashlight of second of phase-modulation of progress and the second signal light without progress phase-modulation are sent to coupling list The first port of member；In the case where receiving the first flashlight without carrying out phase-modulation of processing unit transmission, will not have There are the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation to be sent to the second of coupling unit Port.

In order to make the light intensity of two ways of optical signals that coupling unit receives basically identical, therefore in the light path of the second optical signal Upper setting attenuation units, so that the loss of left and right two-way is identical, and then occurs interference completely optionally at coupling unit, time domain Filter further includes：The attenuation units being connect with coupling unit, the second Faraday rotation mirror unit being connect with attenuation units； Attenuation units are used for：The second signal light that coupling unit is sent is received, second signal light is subjected to attenuation of the first kind, obtains the Second signal light after primary attenuation, the second Faraday rotation mirror unit is sent to by second signal light after attenuation of the first kind；It receives What the second Faraday rotation mirror unit was sent carries out attenuation of the first kind and the second signal light of polarization rotation, will carry out declining for the first time The second signal light for subtracting and polarizing rotation carries out the attenuation of the second kind, is not carried out the second signal light of phase-modulation, will not had There is the second signal light for carrying out phase-modulation to be sent to coupling unit；Second Faraday rotation mirror unit, is used for：Receiving attenuation list Second signal light after the attenuation of the first kind that member is sent, the polarization of second signal light after attenuation of the first kind is rotated by 90 °, is obtained Carry out attenuation of the first kind and the second signal light of polarization rotation, and the second signal light that attenuation of the first kind and polarization rotation will be carried out It is sent to attenuation units；Coupling unit is used for：In the polarization rotation for receiving processing unit transmission and carry out second of phase tune In the case of first flashlight of system, first flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase The second signal light of position modulation is sent to the first port of coupling unit；Receive processing unit transmission without carry out phase In the case of first flashlight of modulation, by no the first flashlight for carrying out phase-modulation and the without carrying out phase-modulation Binary signal light is sent to the second port of coupling unit.

Optionally, flashlight is quantum optical signal, and the first flashlight is the first quantum optical signal, and second signal light is second Quantum optical signal；First port connects quantum optical signal receiver；Pulse pump light generates unit, is used for：Receive synchronizable optical letter Number；Instruction information is determined according to synchronous optical signal；Wherein, instruction information indicates the burst length information of quantum optical signal；Root According to instruction information generation pulse pump light；Wherein, during the pulse of the burst length information of pulse pump light and quantum optical signal Between information matches.

In specific implementation, the burst length information of pulse pump light has with the burst length information matches of quantum optical signal Body refers to that a pulse of pulse pump light corresponds to the pulse of a quantum optical signal, the pulse of corresponding pulse pump light Occupied time and the pulse occupied time of quantum optical signal, the overlapping region was more than overlapping region there are overlapping region Threshold value.The occupied duration in the overlapping region is the time-domain filtering device as duration when switching in the state of opening. In another optional scheme, shared by the pulse occupied time of corresponding pulse pump light and the pulse of quantum optical signal Time is completely superposed, in this way, the pulse of each quantum optical signal can be obtained more accurately.

In force, quantum signal receiver can the pulse-recovery of throughput sub-light signal go out original quantum key, and its There are the noise that more classical optical signal or other factors are brought on its signal, can cause if it enters quantum signal receiver The recovery rate of original quantum key declines, in the prior art between the pulse of quantum optical signal and the pulse of quantum optical signal Noise can be all entered in quantum signal receiver, and time-domain filtering device provided in an embodiment of the present invention can realize extremely narrow filtering Effect, the present embodiment can greatly reduce the noise photon number into quantum signal receiver, improve the mixed transmissibility of system Energy.For example it is that the quantum in 1ns gate-width quantum signal receivers is visited that the time-domain filtering device of 100ps, which inhibits the ability of noise photon, Survey device 10 times.

The embodiment of the present invention provides a kind of time-domain filtering method, which has above device execution, the time domain Filtering method includes：

Flashlight is received, and flashlight is divided into the first flashlight and second signal light；

Instruction information is obtained, according to instruction information generation pulse pump light；In the case where there is pulse pump light, pass through arteries and veins It rushes pump light and first time phase-modulation is carried out to the phase of the first flashlight, by the first signal after progress first time phase-modulation The polarization of light is rotated by 90 °, and is obtained the first flashlight for carrying out first time phase-modulation and polarization rotation, is passed through pulse pump light The phase of the first flashlight to carrying out first time phase-modulation and polarization rotation carries out second of phase-modulation, obtains polarization rotation Turn and carry out the first flashlight of second of phase-modulation, and the first signal for rotating and carrying out second of phase-modulation will be polarized Light and the second signal light without carrying out phase-modulation are sent to first port；In the case of no pulse pump light, will not have There are the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation to be sent to second port.

Optionally, flashlight is received, and flashlight is divided into the first flashlight and second signal light, including：Pass through second Port receives flashlight；Flashlight is divided into the first flashlight and second signal light；First flashlight is sent by third port, Second signal light is sent by the 4th port；To polarize rotation and carry out second phase-modulation the first flashlight and not into The second signal light of row phase-modulation is sent to first port, including：By the polarization received by third port rotate and into First flashlight of second of phase-modulation of row and the second signal without carrying out phase-modulation received by the 4th port Light is sent to the first port of coupling unit；By no the first flashlight for carrying out phase-modulation and without carrying out phase-modulation Second signal light is sent to second port, including：The letter of first without carrying out phase-modulation that will be received by third port Number light and the second end that coupling unit is sent to by the second signal light without carrying out phase-modulation that the 4th port receives Mouthful.

Optionally, in the case where there is pulse pump light, the is carried out to the phase of the first flashlight by pulse pump light The polarization of the first flashlight after progress first time phase-modulation is rotated by 90 ° by phase-modulation, obtains carrying out for the first time Phase-modulation and the first flashlight of polarization rotation, by pulse pump light to carrying out first time phase-modulation and polarizing rotation The phase of first flashlight carries out second of phase-modulation, obtains polarization rotation and carries out the first signal of second of phase-modulation Light, including：In the case where there is pulse pump light, pulse pump light and the first flashlight are coupled, obtain the first coupling Flashlight；First coupled signal light is sent to media units, by the pulse pump light in the first coupled signal light in medium Unit carries out first time phase-modulation to the phase of the first flashlight in the first coupled signal light, obtains carrying out first time phase First flashlight of modulation and the second coupled signal light of pulse pump optical coupling；It will be carried out for the first time in second coupled signal light The polarization of the first flashlight after phase-modulation is rotated by 90 °, and obtains carrying out first time phase-modulation and the first letter of polarization rotation Number light and the third coupled signal light of pulse pump optical coupling；Third coupled signal light is sent to media units, passes through third Pulse pump light in coupled signal light in media units to the progress first time phase-modulation in third coupled signal light and partially Shake rotation the first flashlight phase carry out second of phase-modulation, obtain carry out second of phase-modulation and polarization rotation 4th coupled signal light of the first flashlight and pulse pump optical coupling；To the 4th coupled signal Optical Demultiplexing, polarization rotation is obtained Turn and carry out the first flashlight of second of phase-modulation.

Optionally, in the case of no pulse pump light, by no the first flashlight for carrying out phase-modulation and do not have The second signal light for carrying out phase-modulation is sent to before second port, is further included：It, will in the case of no pulse pump light The polarization of first flashlight is rotated by 90 °, and is not carried out the first flashlight of phase-modulation.

Optionally, first flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase-modulation Second signal light is sent to first port, including：The polarization of second signal light is rotated by 90 °, is not carried out phase tune The second signal light of system；First flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase-modulation Second signal light is sent to first port；By no the first flashlight for carrying out phase-modulation and the without carrying out phase-modulation Binary signal light is sent to second port, including：The polarization of second signal light is rotated by 90 °, is not carried out phase-modulation Second signal light；No the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation are sent To second port.

Optionally, first flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase-modulation Second signal light is sent to first port, including：Second signal light is subjected to attenuation of the first kind, is obtained second after attenuation of the first kind Flashlight；The polarization of second signal light after attenuation of the first kind is rotated by 90 °, obtains carrying out attenuation of the first kind and polarization rotation Second signal light；The second signal light for carrying out attenuation of the first kind and polarization rotation is decayed, is not carried out phase The second signal light of modulation will polarize first flashlight of second of phase-modulation of rotation and progress and without carrying out phase-modulation Second signal light be sent to first port；By no the first flashlight for carrying out phase-modulation and without carrying out phase-modulation Second signal light is sent to second port, including：Second signal light is subjected to attenuation of the first kind, is obtained second after attenuation of the first kind Flashlight；The polarization of second signal light after attenuation of the first kind is rotated by 90 °, obtains carrying out attenuation of the first kind and polarization rotation Second signal light；The second signal light for carrying out attenuation of the first kind and polarization rotation is decayed, is not carried out phase The second signal light of modulation, by no the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation It is sent to second port.

Optionally, flashlight is quantum optical signal, and the first flashlight is the first quantum optical signal, and second signal light is second Quantum optical signal；First port connects quantum optical signal receiver；Instruction information is obtained, according to instruction information generation pulse pump Light, including：Receive synchronous optical signal；Instruction information is determined according to synchronous optical signal；Wherein, instruction information indicates that quantum light is believed Number burst length information；According to instruction information generation pulse pump light；Wherein, the burst length information of pulse pump light with The burst length information matches of quantum optical signal.

Description of the drawings

To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly introduced.

Fig. 1 is the structure diagram of a kind of time-domain filtering photoswitch that the prior art provides；

Fig. 2 is a kind of structure diagram of time-domain filtering device provided in an embodiment of the present invention；

Fig. 3 is the structure diagram of another time-domain filtering device provided in an embodiment of the present invention；

Fig. 4 is the structure diagram of another time-domain filtering device provided in an embodiment of the present invention；

Fig. 5 is the structure diagram of another time-domain filtering device provided in an embodiment of the present invention；

Fig. 6 is the structure diagram of another time-domain filtering device provided in an embodiment of the present invention；

Fig. 7 is that flashlight is exported from coupling unit to first farad in the case of having pulse pump light in the embodiment of the present invention The flow diagram of rotation mirror unit and the second Faraday rotation mirror unit；

Fig. 8 be have in the case of pulse pump light flashlight from the first Faraday rotation mirror unit in the embodiment of the present invention and Second Faraday rotation mirror unit is exported to the flow diagram of coupling unit；

Fig. 9 is the flow signal for having in the embodiment of the present invention optic path of the first flashlight in the case of pulse pump light Figure；

Figure 10 is that flashlight is exported from coupling unit to first in the case of not having pulse pump light in the embodiment of the present invention The flow diagram of Faraday rotation mirror unit and the second Faraday rotation mirror unit；

Figure 11 is not have in the case of pulse pump light flashlight in the embodiment of the present invention from the first faraday rotation mirror list Member and the second Faraday rotation mirror unit are exported to the flow diagram of coupling unit；

Figure 12 is a kind of quantum communication system structure diagram using time-domain filtering device provided in an embodiment of the present invention；

Figure 13 is another quantum communication system structural representation for applying time-domain filtering device provided in an embodiment of the present invention Figure；

Figure 14 is a kind of communication system architecture schematic diagram using time-domain filtering device provided in an embodiment of the present invention；

Figure 15 be a kind of time-domain filtering device provided in an embodiment of the present invention as switching in the case of the duration that switchs Schematic diagram；

Figure 16 is a kind of flow diagram of time-domain filtering method provided in an embodiment of the present invention.

Specific embodiment

In order to which the purpose of the present invention, technical solution and advantageous effect is more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair It is bright, it is not intended to limit the present invention.

Fig. 2 illustrates a kind of structure diagram of time-domain filtering device provided in an embodiment of the present invention, such as Fig. 2 institutes Show, which includes coupling unit 213, the processing unit 212 being connect with coupling unit 213；With processing unit The pulse pump light of 212 connections generates unit 214.Coupling unit 213 may include two ports, the first end in respectively Fig. 2 Mouth 226 and second port 227.

Flashlight for receiving flashlight, and is divided into the first flashlight and second signal light by coupling unit 213, by One flashlight is sent to processing unit 212；In the polarization rotation for receiving the transmission of processing unit 212 and carry out second of phase tune In the case of first flashlight of system, first flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase The second signal light of position modulation is sent to the first port 226 of coupling unit 213；Receiving not having for the transmission of processing unit 212 In the case of having the first flashlight for carrying out phase-modulation, by no the first flashlight for carrying out phase-modulation and without carrying out phase The second signal light of position modulation is sent to the second port 227 of coupling unit.In a kind of embodiment optionally, polarization rotation And carry out second phase-modulation the first flashlight and without progress phase-modulation second signal light in coupling unit 213 Interfered or alternatively referred to as coupled, exported later from the first port 226 of coupling unit 213；Do not carry out phase First flashlight of modulation and the second signal light without carrying out phase-modulation are interfered in coupling unit 213, Huo Zheye It can be described as being coupled, be exported later from the second port 227 of coupling unit 213.

Optionally, coupling unit further includes 228 and the 4th port 229 of third port；Coupling unit is used for：Pass through second Port 227 receives flashlight, and flashlight is divided into the first flashlight and second signal light；By third port 228 by first Flashlight is sent to processing unit；Second signal light is sent by the 4th port 229；Polarization rotation is received by third port 228 Turn and the first flashlight for carrying out second phase-modulation or the first flashlight without carrying out phase-modulation；Pass through the 4th port 229 receive the second signal light without carrying out phase-modulation；In the polarization that processing unit transmission is received by third port 228 In the case of first flashlight of second of phase-modulation of rotation and progress, the polarization received by third port 228 is revolved Turn and carry out second phase-modulation the first flashlight and by the 4th port 229 receive without carrying out phase-modulation Second signal light is sent to the first port 226 of coupling unit；For processing unit transmission is not being received by third port 228 Have carry out phase-modulation the first flashlight in the case of, by by third port 228 receive without carry out phase-modulation The first flashlight and to be sent to coupling by the second signal light without carrying out phase-modulation that the 4th port 229 receives single The second port 227 of member.

Optionally, the second signal light exported in the 4th port 229 in coupling unit can be re-introduced into the 4th port 229 In.In a kind of optionally embodiment, second signal light is re-introduced into the 4th end after the output of the 4th port 229 by cycle In mouthfuls 229, in another optionally embodiment, second signal light exported from the 4th port 229 after by certain processing, than Such as polarize rotation, attenuation processing after be re-introduced into the 4th port 229, no matter which kind of scheme, be re-introduced into the 4th end The second signal light of mouth 229 is all the flashlight for not carrying out phase-modulation.The 4th port 229 is connected to a ring in Fig. 2, only The technique of painting is only exemplary, second signal light is briefly described by certain processing or is treated as this Shen without certain Please described in without carry out phase-modulation second signal light after, do not carry out the second signal light of phase-modulation again It is transmitted to the process of the 4th port 229.

In the embodiment of the present invention, phase difference of the coupling unit 213 between the two ways of optical signals for determining to receive is zero In the case of, it is exported after two ways of optical signals is interfered from second port.Specifically, coupling unit receive without carry out phase Phase difference between the first flashlight modulated and the second signal light without carrying out phase-modulation is zero, then will be without carrying out phase First flashlight of position modulation and without being exported after the second signal interference of light of progress phase-modulation from second port 227.

In the embodiment of the present invention, phase difference of the coupling unit 213 between the two ways of optical signals for determining to receive is not zero In the case of, it is preset value, then exports the two ways of optical signals after interference from first port 226.Two kinds of situations, feelings can be divided into Condition a1, it is by the two ways of optical signals after interference all from first port output or situation a2, the two ways of optical signals after interference is same When exported from first port and second port.

Situation a1, preset value are such as π, then coupling unit 213 determines that the phase difference of two ways of optical signals is π, then by two It is exported completely from first port after the optical signal interference of road.That is, the carry out after the phase-modulation that coupling unit receives Phase difference between phase-modulation and the first flashlight of polarization rotation and the second signal light without carrying out phase-modulation For π, then the first flashlight and the no progress phase tune that first time phase-modulation and polarization rotate will be carried out after phase-modulation It is exported after the second signal interference of light of system from first port 226.In the embodiment of the present invention, optionally, phase in the embodiment of the present invention Modulated the first flashlight for carrying out first time phase-modulation and polarization rotation in position and the second letter without carrying out phase-modulation Phase difference between number light is π.That is, phase-modulation twice has been carried out in the embodiment of the present invention to the first flashlight, two The summation of the phase changing capacity modulated of secondary phase-modulation is π.

Situation a2, optionally, progress first time phase-modulation and polarization rotation after the phase-modulation that coupling unit receives There are phase difference between the first flashlight turned and the second signal light without carrying out phase-modulation, phase difference be 0 between π, Then by the first flashlight for carrying out first time phase-modulation and polarization rotation after phase-modulation and without carrying out phase-modulation It after the second signal interference of light, while is exported from first port 226 and second port 227, from first port 226 and second port The ratio of 227 outputs can be adjusted, such as according to carry out first time phase-modulation and polarization rotation first after phase-modulation Flashlight and without carry out phase-modulation second signal light between phase difference adjust.

The first flashlight of pulse pump light has successively carried out phase-modulation twice in the embodiment of the present invention, due to of the invention real It applies that light path in example is shorter, attenuation of the pulse pump light in phase modulation process twice can be neglected and is contemplated that phase tune twice The light intensity of pulse pump light is identical during system.Optionally, in the embodiment of the present invention pulse pump light to the phase of the first flashlight The phase changing capacity that position carries out first time phase-modulation can adjust by adjusting the light intensity of pulse pump light.

Pulse pump light generates unit 214, and information is indicated for obtaining, according to instruction information generation pulse pump light；And The pulse pump light of generation is sent to processing unit 212.

Pulse pump light generates unit 214 and obtains instruction information, for example pass through hair there are many mode in the embodiment of the present invention The either preset in advance or preset in advance rule that the information that the side of sending is sent is determined, and the instruction determined according to the rule Information etc. is not limited in the embodiment of the present invention.Pulse pump light in the embodiment of the present invention is the pump light of impulse form, That is just there are some pulses at interval in pulse pump in time, the specifying information of a pulse in pulse pump light It can be obtained, such as the pulse duration from instruction information, pulse pump light generation time, dwell time etc. information.

Processing unit 212, in the situation for the pulse pump light for receiving the generation transmission of unit 214 of pulse pump light Under, first time phase-modulation is carried out to the phase of the first flashlight by pulse pump light, after first time phase-modulation is carried out The polarization of the first flashlight be rotated by 90 °, obtain the first flashlight for carrying out first time phase-modulation and polarization rotation, pass through Pulse pump light carries out second of phase-modulation to the phase for carrying out the first flashlight of first time phase-modulation and polarization rotation, It obtains polarization rotation and carries out the first flashlight of second of phase-modulation, and polarization is rotated and carries out second of phase-modulation The first flashlight be sent to coupling unit 213；In the pulse pump light for being not received by the generation unit transmission of pulse pump light In the case of, no the first flashlight for carrying out phase-modulation is sent to coupling unit 213.

In the embodiment of the present invention, because is there is some pulses at interval, processing unit on the time in pulse pump light 212 can receive pulse pump light within a continuous period, and will not be received on continuous next period Pulse pump light.That is, in the embodiment of the present invention in the case of pulse pump light is received, can will polarization rotation and into First flashlight of second of phase-modulation of row and no phase-modulation second signal light that carries out are exported by first port, this hair In bright embodiment in the case of pulse pump light is not received, can by have carry out phase-modulation the first flashlight and not into The second signal light of row phase-modulation is exported by second port, so as to can be by by time-domain filtering device in the embodiment of the present invention First port the switching function that different device realizes time-domain filtering device is connected with second port.

Fig. 3 illustrates the structure diagram of another time-domain filtering device provided in an embodiment of the present invention, such as Fig. 3 Shown, optionally, processing unit 212 includes：Multiplexing/the solution being connect with pulse pump light generation unit 214 and coupling unit 213 Multiplexing Unit 223, the media units 222 being connect with multiplex/demultiplex unit 223, first farad connect with media units 222 Rotation mirror unit 221.

Multiplex/demultiplex unit 223, in the pulse pump light for receiving the generation transmission of unit 214 of pulse pump light In the case of, the first flashlight sent to pulse pump light and the coupling unit 213 received couples, and obtains the first coupling Close flashlight；First coupled signal light is sent to media units 222；To the 4th coupled signal Optical Demultiplexing, polarization rotation is obtained Turn and carry out the first flashlight of second of phase-modulation, and the first signal for rotating and carrying out second of phase-modulation will be polarized Light is sent to coupling unit 213.

Media units 222, for the pulse pump light in the first coupled signal light to be made to be coupled in media units 222 to first The phase of the first flashlight in flashlight carries out first time phase-modulation, obtains carrying out the first signal of first time phase-modulation Second coupled signal light of light and pulse pump optical coupling, and the second coupled signal light is sent to the first faraday rotation mirror list Member 221；Make the pulse pump light in third coupled signal light in media units to the progress first time in third coupled signal light The phase of phase-modulation and the first flashlight of polarization rotation carries out second of phase-modulation, obtains carrying out second of phase-modulation And the first flashlight of rotation and the 4th coupled signal light of pulse pump optical coupling are polarized, and the 4th coupled signal light is sent To multiplex/demultiplex unit.Media units are there are a variety of implementations in the embodiment of the present invention, as long as pulse pump light can be made to exist It is non-linear to the generation of the first flashlight of the first flashlight and progress first time phase-modulation and polarization rotation in media units Effect, so as to which the phase of the first flashlight to the first flashlight and progress first time phase-modulation and polarization rotation carries out second Secondary phase-modulation, such as media units can be Ke Er (Kerr) medium, can be general single mode fiber, light specifically Photonic crystal fiber, Si-wire waveguide, quantum dot etc. have the medium of third-order non-linear.

Optionally, pulse pump light carries out first time phase-modulation to the phase of the first flashlight in the embodiment of the present invention Phase changing capacity can adjust by adjusting the light intensity of pulse pump light, on the other hand also can be by adjusting the material of media units Structure etc. parameter is realized.

First Faraday rotation mirror unit 221, for it will carry out first time phase-modulation in the second coupled signal light after The polarization of first flashlight is rotated by 90 °, and obtains the first flashlight and pulse pump for carrying out first time phase-modulation and polarization rotation The third coupled signal light of Pu optical coupling；Third coupled signal light is sent to media units 222.

May include faraday rotation mirror in first Faraday rotation mirror unit 221, can mainly by permanent magnet, magneto-optical crystal and Speculum group into.Such as 90 degree of faraday's speculums, magnetic field is provided to magneto-optical crystal by permanent magnet, when there is light beam to pass through, The polarization of the light beam can rotate 45 degree under magneto-optic effect, and magneto-optical crystal is again passed by after speculum reflects, and will continue to rotate It is 45 degree, final so that incident and outgoing light polarization direction is rotated by 90 °.

In the embodiment of the present invention, the second coupled signal light is entered in the first Faraday rotation mirror unit 221, first farad Rotation mirror unit only carries out the polarization of the first flashlight after progress first time phase-modulation in the second coupled signal light It rotates, the component for being meant that horizontal direction (X-axis) that the polarization in the embodiment of the present invention is rotated by 90 ° is rotated to vertical direction (Y-axis), the component of vertical direction (Y-axis) are rotated to horizontal direction (X-axis), for example turn 90 degrees or deflect 270 partially, are made in a word It, which is deflected, is rotated by 90 ° or 90 degree of odd-multiple.

For example, the wave-length coverage of the wave-length coverage of pulse pump light and the first flashlight is set as distant Two wave-length coverages, and the parameter of the first Faraday rotation mirror unit is specifically set, so as to fulfill only to receiving To the second coupled signal light in carry out the polarization of the first flashlight after first time phase-modulation and rotated, coupled to second Purpose of the polarization of pulse pump light in flashlight without rotation.

Based on this, multiplex/demultiplex unit 223 in the embodiment of the present invention can be Wavelength division multiplexer/demultiplexer, as with The related coupler of wavelength.On the one hand light that Wavelength division multiplexer/demultiplexer can export the transmitter of multiple and different wavelength is believed It number combines, is input to an optical fiber；On the other hand, the light of multiple and different wavelength of an optical fiber output can be believed Number, it separates.Specifically, multiplex/demultiplex unit 223 can be the first flashlight and pulse pump optical coupling received Into an optical fiber, and pass through the optical fiber output to media units, on the other hand the media units received can also be exported The first flashlight of second of phase-modulation of pulse pump light and polarization rotation and progress that flashlight includes after second interference Separate, and pass through port will polarize rotation and carry out second of phase-modulation the first flashlight be sent to coupling unit 213, the pulse pump light isolated is exported by other port.

Optionally, multiplex/demultiplex unit 223, is additionally operable to：In the arteries and veins for not receiving the generation unit transmission of pulse pump light In the case of rushing pump light, the first flashlight that the coupling unit received is sent is sent to first farad by media units Rotation mirror unit；First Faraday rotation mirror unit 221, for the polarization of the receive first flashlight to be rotated by 90 °, The first flashlight of phase-modulation is not carried out；No the first flashlight for carrying out phase-modulation is passed sequentially through into medium list Member and multiplex/demultiplex unit are sent to coupling unit.

That is, in the embodiment of the present invention, the situation of pulse pump light is not generated in pulse pump light generation unit 214 Under, the first flashlight that coupling unit 213 is separated passes through multiplex/demultiplex unit 223 and media units 222 to the first successively After Faraday rotation mirror unit 221, the phase of the first flashlight will not be modulated, therefore the phase of the first flashlight does not become Change, the polarization of the first flashlight deflected 90 degree in the first Faraday rotation mirror unit 221, rear polarizer have rotated 90 degree, And the first flashlight of phase-modulation passes sequentially through media units 222 and multiplex/demultiplex unit 223 returns to coupling without carrying out In unit 213.Coupling unit 213 believes no the first flashlight for carrying out phase-modulation and second without carrying out phase-modulation Number light is exported by second port 227.

In the above, based on Fig. 2 and content shown in Fig. 3, the second optical signal that coupling unit 213 exports and without The modulation of phase optionally, also can directly come back to coupling unit 213 without other processing procedures, so as to fulfill with It does not carry out the first flashlight of phase-modulation or is revolved with the progress first time phase-modulation and polarization for having carried out phase-modulation Coupling between the first flashlight turned, as shown in Figures 2 and 3.Optionally, in figure 2 and figure 3, can to polarization rotation and The polarization for carrying out the first flashlight of second of phase-modulation is rotated by 90 ° again, is not carried out so that coupling unit 213 is realized Coupling or realization between the second signal light of phase-modulation and no the first flashlight for carrying out phase-modulation do not carry out The second signal light of phase-modulation and the first signal for carrying out first time phase-modulation and polarization rotation for having carried out phase-modulation Coupling between light.

It further, can be in the second letter for the polarization state that the two paths of signals light of arrival coupling unit 213 is made to keep identical The second Faraday rotation mirror unit is correspondingly arranged in the light path of number light.Fig. 4 illustrates provided in an embodiment of the present invention another A kind of structure diagram of time-domain filtering device, as shown in figure 4, time-domain filtering device further includes what is connect with coupling unit 213 Second Faraday rotation mirror unit 224.

Second Faraday rotation mirror unit 224, for receiving the second signal light of coupling unit transmission, by second signal light Polarization be rotated by 90 °, do not carried out the second signal light of phase-modulation, and the second of phase-modulation is carried out by no Flashlight is sent to coupling unit.

In the embodiment, optionally, the polarization of second signal light can be revolved by the second Faraday rotation mirror unit 224 It turn 90 degrees, polarizes the polarization of postrotational second signal light and the polarization and coupling of the second signal light without carrying out phase-modulation Close unit 213 receive without carry out phase-modulation the first flashlight and carry out phase-modulation progress first time phase The polarization of first flashlight of position modulation and polarization rotation is identical.

May include faraday rotation mirror in second Faraday rotation mirror unit 224, can mainly by permanent magnet, magneto-optical crystal and Speculum group into.Such as 90 degree of faraday's speculums, magnetic field is provided to magneto-optical crystal by permanent magnet, when there is light beam to pass through, The polarization of the light beam can rotate 45 degree under magneto-optic effect, and magneto-optical crystal is again passed by after speculum reflects, and will continue to rotate It is 45 degree, final so that incident and outgoing light polarization direction is rotated by 90 °.

Correspondingly, coupling unit 213, in second of the phase of polarization rotation and progress for receiving processing unit transmission In the case of first flashlight of modulation, first flashlight of second of phase-modulation of rotation and progress will be polarized and do not carried out The second signal light of phase-modulation is sent to the first port of coupling unit；Receive processing unit transmission without carry out phase In the case of first flashlight of position modulation, by no the first flashlight for carrying out phase-modulation and without carrying out phase-modulation Second signal light is sent to the second port of coupling unit.

In order to make the light intensity of two ways of optical signals that coupling unit 213 receives basically identical, therefore in the second optical signal Attenuation units 225 in light path are set, so that the loss of left and right two-way is identical, and then interference completely occur at coupling unit 213. Fig. 5 illustrates the structure diagram of another time-domain filtering device provided in an embodiment of the present invention, as shown in figure 5, when Domain filter device further includes：The attenuation units 225 being connect with coupling unit 213, the second faraday being connect with attenuation units 225 Rotate mirror unit 224.

Optionally, second signal light for receiving the second signal light of coupling unit transmission, is carried out first by attenuation units Secondary attenuation obtains second signal light after attenuation of the first kind, and second signal light after attenuation of the first kind is sent to the second faraday rotation Mirror unit；The second signal light for carrying out attenuation of the first kind and polarization rotation of the second Faraday rotation mirror unit transmission is received, The second signal light for carrying out attenuation of the first kind and polarization rotation is decayed, is not carried out the second signal of phase-modulation No second signal light for carrying out phase-modulation is sent to coupling unit by light.Optionally, attenuation units can be variable optical attenuation Device, the luminous power of the flashlight in the light path to second signal light decay, and attenuation degree can be according to actual needs It is adjusted.After attenuation units 225 decay to the signal in the light path of second signal light, what coupling unit 213 received The luminous power of two ways of optical signals is basically identical.

Optionally, correspondingly the second Faraday rotation mirror unit, after the attenuation of the first kind sent for receiving attenuation unit The polarization of second signal light after attenuation of the first kind is rotated by 90 ° by second signal light, obtains carrying out attenuation of the first kind and polarization The second signal light of rotation, and the second signal light for carrying out attenuation of the first kind and polarization rotation is sent to attenuation units.

Optionally, correspondingly coupling unit, in the polarization rotation for receiving processing unit transmission and carrying out second In the case of first flashlight of phase-modulation, first flashlight of second of phase-modulation of rotation and progress will be polarized and do not had The second signal light for carrying out phase-modulation is sent to the first port of coupling unit；Receive processing unit transmission without into In the case of first flashlight of row phase-modulation, by no the first flashlight for carrying out phase-modulation and without carrying out phase tune The second signal light of system is sent to the second port of coupling unit.In a kind of embodiment optionally, polarization rotation and progress First flashlight of second phase-modulation and the second signal light without carrying out phase-modulation are done in coupling unit 213 It relates to, is exported later from the first port 226 of coupling unit 213；It does not carry out the first flashlight of phase-modulation and does not carry out The second signal light of phase-modulation is interfered in coupling unit 213 or is alternatively referred to as coupled, single from coupling later The second port 227 of member 213 exports.

Fig. 6 illustrates the structure diagram of another time-domain filtering device provided in an embodiment of the present invention, such as Fig. 6 Shown, being generated in pulse pump light increases optical circulator 231 between unit 214 and multiplex/demultiplex unit 223, in second end Optical circulator 232 is connected on mouth 227.

The function of optical circulator 231 and any one optical circulator in optical circulator 232 is incident from some port for light When, light is only allowed light to be prevented to be transmitted toward other directions particularly negative direction toward transmitting on a specific direction.Specifically, light Circulator 231 includes port S1, port S2 and port S3.Pulse pump light enters from port S1, can only be exported from port S2；If Enter from port S2, then can only be exported from port S3.Optical circulator 232 includes port S4, port S5 and port S6.Flashlight from Port S4 enters, and can only be exported from port S5；If entering from port S5, can only be exported from port S6.

Fig. 7 illustrates in the embodiment of the present invention flashlight in the case of having pulse pump light and is exported from coupling unit To the first Faraday rotation mirror unit and the flow diagram of the second Faraday rotation mirror unit, Fig. 8 illustrates this hair There is in the case of pulse pump light flashlight in bright embodiment from the first Faraday rotation mirror unit and the second faraday rotation mirror Unit is exported to the flow diagram of coupling unit, and Fig. 9 illustrates the feelings for having pulse pump light in the embodiment of the present invention The flow diagram of the optic path of first flashlight under condition.With reference to Fig. 7, Fig. 8 and Fig. 9 to provided in an embodiment of the present invention A kind of example is introduced.

As shown in fig. 7, flashlight is divided into the first flashlight and second signal light by coupling unit 213, by the first flashlight Multiplex/demultiplex unit 223 is sent to, second signal light is sent to attenuation units 225.

Situation b1, in the case of having pulse pump light, the corresponding optic path process of second signal light：

Attenuation units 225 for receiving the second signal light of coupling unit transmission, second signal light decline for the first time Subtract, obtain second signal light after attenuation of the first kind, second signal light after attenuation of the first kind is sent to the second faraday rotation mirror Unit 224.Second Faraday rotation mirror unit 224, the polarization of second signal light after attenuation of the first kind is rotated by 90 °, is obtained Carry out attenuation of the first kind and the second signal light of polarization rotation, and the second signal light that attenuation of the first kind and polarization rotation will be carried out It is sent to attenuation units.As shown in figure 8, attenuation units 225 connect the second signal light that will carry out attenuation of the first kind and polarization rotation Decay, do not carried out the second signal light of phase-modulation, no second signal light for carrying out phase-modulation is sent To coupling unit.

Situation b2, in the case of having pulse pump light, the corresponding optic path process of the first flashlight：

Pulse pump light generates unit 214, and the pulse pump light of generation is sent to multiplex/demultiplex unit 223.

Multiplex/demultiplex unit 223, in the situation for the pulse pump light for receiving the generation unit transmission of pulse pump light Under, pulse pump light and the first flashlight are coupled, obtain the first coupled signal light；First coupled signal light is sent to Media units 222.

Media units 222, for the pulse pump light in the first coupled signal light to be made to believe in media units the first coupling The phase of the first flashlight in number light carries out first time phase-modulation, obtains carrying out the first flashlight of first time phase-modulation With the second coupled signal light of pulse pump optical coupling, and the second coupled signal light is sent to the first Faraday rotation mirror unit 221。

First Faraday rotation mirror unit 221, for it will carry out first time phase-modulation in the second coupled signal light after The polarization of first flashlight is rotated by 90 °, and obtains the first flashlight and pulse pump for carrying out first time phase-modulation and polarization rotation The third coupled signal light of Pu optical coupling.As shown in figure 8, third coupled signal light is sent to media units 222.

Media units 222 are used to make the pulse pump light in third coupled signal light in media units to third coupled signal Phase second of the phase-modulation of progress for carrying out first time phase-modulation and the first flashlight of polarization rotation and pulse in light Pump light generates nonlinear interaction in media units to the first flashlight for carrying out first time phase-modulation and polarization rotation, obtains To the 4th coupled signal light of the first flashlight and pulse pump optical coupling for carrying out second of phase-modulation and polarization rotation, and 4th coupled signal light is sent to multiplex/demultiplex unit 223；

Multiplex/demultiplex unit 223 obtains polarization rotation and carries out second of phase to the 4th coupled signal Optical Demultiplexing First flashlight of modulation, and the first flashlight that will polarize second of phase-modulation of rotation and progress is sent to coupling unit 213.Pulse pump light after demultiplexing is sent out, such as in figure 6 from another port, by the pulse pump light after demultiplexing It is sent out from the port S3 of optical circulator 231.

Coupling unit 213, the first of second of the phase-modulation of polarization rotation and progress for receiving processing unit transmission In the case of flashlight, first flashlight of second of phase-modulation of rotation and progress will be polarized and without carrying out phase-modulation Second signal light is sent to the first port 226 of coupling unit.

As shown in figure 9, multiplex/demultiplex unit 223 receives the first flashlight, the first flashlight is in the component of X-axis Xa, the first flashlight Y-axis component for Ya, absolute value that the absolute value of Ya can be greater than, equal to or less than Xa.It is multiplexed/demultiplexes Pulse pump light is received with unit 223, pulse pump light is Xb in the component of X-axis, and pulse pump light is in the component of Y-axis The absolute value of Yb, Yb can be greater than, equal to or less than Xb absolute value.Multiplex/demultiplex unit 223 is by the first flashlight and pulse Input value media units 222 after pumping optical multiplexing.Ya by Yb modulating action, Xa by Xb modulating action.Enter later To the first Faraday rotation mirror unit 221.In the first Faraday rotation mirror unit 221, by the Xa of the modulating action of Xb Polarization is rotated by 90 °, and becomes the component in Y-axis, is rotated by 90 ° by the polarization of the Ya of the modulating action of Yb, becomes point in X-axis Amount.The polarization of pulse pump light is not affected by deflection, therefore is still Xb in the component of X-axis, is still Yb in the component of Y-axis.Polarization rotation Enter in media units 222 after turning, the Xa by the modulating action of Xb is the component in Y-axis, by the Y-axis point of pulse pump light The non-linear modulation effect of Yb is measured, the Ya by the modulating action of Yb is the component in X-axis, by the X-axis point of pulse pump light The non-linear modulation effect of Xb is measured, is taken in later in multiplex/demultiplex unit 223 and is demultiplexed and exports.Obtained polarization The Y-axis component of first flashlight of second of phase-modulation of rotation and progress is the Xa modulated successively by Xb and Yb, is obtained The Ya that the X-axis component of first flashlight of second of phase-modulation of polarization rotation and progress is modulated to pass through Yb and Xb successively. That is the X-axis of the first flashlight and the component of Y-axis pass through the modulation of Xb and Yb, so as to ensure that the X-axis of the first flashlight It is identical with the phase-modulation variable quantity that the component of Y-axis is subject to, so as to ensure that the phase-modulation variable quantity of the first flashlight not by The influence of the polarization of first flashlight and/or the polarization of pulse pump light.

That is, in the embodiment of the present invention no matter incident pulse pump light and the first flashlight be in which kind of partially It shakes, the nonlinear phase shift that the forward entrance of the first flashlight and the reflected light through the first Faraday rotation mirror unit are subject to is one Complementary process need to only ensure the sum of nonlinear phase shift that the first flashlight is subject in positive and reflection as preset value, such as The purpose that the first flashlight can be realized for π and exported without carrying out the second signal light of phase-modulation from first port, it is seen then that In the embodiment of the present invention under the action of the first Faraday rotation mirror unit optical device and light path various polarization effects, such as Birefringence, optically-active and total reflection are all canceled out, and the time-domain filtering device of the embodiment of the present invention has reached the mesh unrelated with polarization 's.

Figure 10, which is illustrated in the embodiment of the present invention, does not have in the case of pulse pump light flashlight from coupling unit To the first Faraday rotation mirror unit and the flow diagram of the second Faraday rotation mirror unit, Figure 11 is illustrated for output There is no in the case of pulse pump light flashlight in the embodiment of the present invention from the first Faraday rotation mirror unit and the second faraday Rotation mirror unit is exported to the flow diagram of coupling unit.With reference to Figure 10 and Figure 11 to provided in an embodiment of the present invention one Kind example is introduced.

As shown in Figure 10, flashlight is divided into the first flashlight and second signal light by coupling unit 213, by the first flashlight Multiplex/demultiplex unit 223 is sent to, second signal light is sent to attenuation units 225.

Situation c1, in the case of pulse pump light, the corresponding optic path process of second signal light and the above situation In the case that b1 has pulse pump light, the corresponding optic path process of second signal light is identical, and details are not described herein.

Situation c2, in the case of pulse pump light, the corresponding optic path process of the first flashlight：

Multiplex/demultiplex unit 223, in the situation for the pulse pump light for not receiving the generation unit transmission of pulse pump light Under, the first flashlight received is sent to the first Faraday rotation mirror unit 221 by media units 222.Due to not having Pulse pump light, therefore in this case, the phase of the first flashlight is not by pulse pump light modulation.

First Faraday rotation mirror unit 221, the polarization of the first flashlight is rotated by 90 °, and is not carried out phase tune First flashlight of system；No the first flashlight for carrying out phase-modulation is passed sequentially through into media units 222 and multiplex/demultiplex Unit 223 is sent to coupling unit 213.

Coupling unit 213, will be without carrying out phase in the case where receiving and not carrying out the first flashlight of phase-modulation First flashlight of position modulation and the second port 227 that coupling unit is sent to without carrying out the second signal light of phase-modulation. Optionally, as shown in fig. 6, coupling unit 213 by no the first flashlight for carrying out phase-modulation and does not have by second port 227 The port S5 for having the second signal light for carrying out phase-modulation to be sent to optical circulator 232, exports from port S6.

Time-domain filtering device 211 provided in an embodiment of the present invention can be applied to several scenes, such as the biography of quantum optical signal In defeated scene, Figure 12 illustrates a kind of quantum communication system using time-domain filtering device provided in an embodiment of the present invention Structure diagram, Figure 13 illustrate another quantum communications for applying time-domain filtering device provided in an embodiment of the present invention System structure diagram.

In specific implementation, the burst length information of pulse pump light has with the burst length information matches of quantum optical signal Body refers to that a pulse of pulse pump light corresponds to the pulse of a quantum optical signal, the pulse of corresponding pulse pump light Occupied time and the pulse occupied time of quantum optical signal, the overlapping region was more than overlapping region there are overlapping region Threshold value.The occupied duration in the overlapping region is the time-domain filtering device as duration when switching in the state of opening. In another optional scheme, shared by the pulse occupied time of corresponding pulse pump light and the pulse of quantum optical signal Time is completely superposed, in this way, the pulse of each quantum optical signal can be obtained more accurately.Below by detailed example It illustrates.

As shown in figure 12, in the embodiment of the present invention, transmitting terminal includes classical signals transmitter 201, synchronizing signal transmitter 202 and quantum signal transmitter 203, classical optical signal that classical signals transmitter 201 is sent out, synchronizing signal transmitter 202 are sent out The quantum optical signal that the synchronization optical signal and quantum signal transmitter 203 gone out is sent out is sent to by wavelength-division multiplex unit 204 to be connect Receiving end.Also it can be only introduced so that wavelength-division is taken as an example in the embodiment of the present invention by other multiplex modes.

The signal received is reverted to classical optical signal, synchronous optical signal by receiving terminal by wavelength-division demultiplexing unit 205 With quantum optical signal, also can be only introduced so that wavelength-division is taken as an example in the embodiment of the present invention by other multiplex modes.Classical light letter Number be sent to classical signals receiver 206, synchronous optical signal optionally by beam splitter 209 be divided into the first synchronization optical signal and Second synchronizes optical signal, and optionally, beam splitter 209 is only split the power of synchronous optical signal, that is to say, that first Synchronous optical signal and second synchronize optical signal power it is identical or different, first synchronize optical signal and second synchronize optical signal its The all sames such as its parameter such as wavelength.Beam splitter 209 can be 1 × 2 fiber coupler or other can realize optical signal work( The optical device of distribution or combination of the rate between different optical fiber.Optionally, by beam splitter only to the power of synchronous optical signal It is allocated, i.e., the power of the first synchronization optical signal and the second synchronization optical signal may be the same or different, but the first synchronizable optical The other parameters all same of signal and the second synchronization optical signal, such as the parameters all same such as wavelength, polarization, phase.Quantum light is believed Number become flashlight, be entered the port S4 of optical circulator 232, and pass through port S5 and enter coupling unit 213.

Second synchronization optical signal enters in pulse pump light generation unit 214 and is used to generate pulse pump optical signal.Together Walk optical signal described in the pulse information of quantum optical signal, that is to say, that quantum optical signal is also pulse, is believed by synchronizable optical The the second synchronization optical signal number separated can determine the pulse information of quantum optical signal, for example reach receive at what point in time End etc..A kind of optionally realization method is as pulse pump light according to the new strong light of instruction information generation, and another kind is realized Mode is to synchronize optical signal by second by processing, such as by amplifier to amplify, so as to obtain pulse pump light.

Optionally, the first port 226 of coupling unit 213 connects quantum signal receiver 208.It is that is, of the invention In embodiment in the case of quantum optical signal pulses are not received, pulse pump light is not generated, thus will by second port The quantum optical signal output that quantum signal transmitter is sent, for example exported away by port S6, the optical signal of this part is given up It abandons.Only in the case of quantum optical signal pulses are received, the just pulse of corresponding generation pulse pump light, so as to pass through second end Quantum optical signal pulses are input in quantum signal receiver 208 by mouth, it is seen then that time-domain filtering device is in generation pulse pump light In the case of realize the effect opened of switch, successfully by the pulse input of quantum optical signal to quantum signal receiver, when The effect of the pass of switch is realized in the case of not generating pulse pump light, the optical signal amount of being input to that can't will be received Subsignal receiver.

In force, quantum signal receiver can the pulse-recovery of throughput sub-light signal go out original quantum key, and its There are the noise that more classical optical signal or other factors are brought on its signal, can cause if it enters quantum signal receiver The recovery rate of original quantum key declines, in the prior art between the pulse of quantum optical signal and the pulse of quantum optical signal Noise can be all entered in quantum signal receiver, and time-domain filtering device provided in an embodiment of the present invention can realize extremely narrow filtering Effect, the present embodiment can greatly reduce the noise photon number into quantum signal receiver, improve the mixed transmissibility of system Energy.For example it is (ns) the gate-width quantum signal reception of 1 nanosecond that the time-domain filtering device of 100 picoseconds (ps), which inhibits the ability of noise photon, 10 times of quantum detector in machine.

Optionally, due to that only need to receive quantum signal in hybrid transmission system, the optical circulator in this programme can be used Isolator is substituted or is saved, this is by loss of the system of reduction to quantum signal.

As shown in figure 13, quantum optical signal can be by sub- quantum optical signal 241, the sub- quantum of transmitting terminal in the embodiment of the present invention The multiple sub- quantum optical signals of optical signal 242 etc. handle to obtain by the multiplex of wave multiplexer 246.It, can be single by coupling in receiving terminal The quantum optical signal pulses received are divided into multiple sub- quantum optical signals by the first port connection channel-splitting filter 245 of member 213, than Such as sub- quantum optical signal 243 and sub- quantum optical signal 244, so as to be detected respectively to it.

In addition to above-mentioned introduction, the time-domain filtering device in the embodiment of the present invention applies also for FDDI, optical node bypass, returns Drive test examination sensor-based system etc. can also get up use, form time-domain filtering device with other kinds of photoswitch combination Switching system it is more perfect, it is more flexible.Figure 14 illustrates a kind of application time-domain filtering dress provided in an embodiment of the present invention The communication system architecture schematic diagram put as shown in figure 14, includes two time-domain filtering devices in the communication system, transmitting terminal The time-domain filtering device 271 of time-domain filtering device 211 and receiving terminal, time-domain filtering device 211 can also be applied to receiving terminal, this hair In bright embodiment only for example.

Situation d1, flashlight are to be sent to transmission device 262 from transmission device 261.

When no pumping pulse inputs, flashlight is inputted from port S4, and the port S5 outputs through optical circulator 232 connect Backtracking after into time-domain filtering device 211, exports from second port 227, is again introduced into optical circulator 232, from the ring of light The port S6 outputs of shape device 232, the port S15 of optical circulator 293 is transmitted to from main road, enters transmission by its port S14 and sets Standby 262.

When main road has business or breaks down, flashlight can also be transmitted from standby road.Specifically, flashlight is transmitting 261 end of equipment passes through 1:2 couplers, flashlight is divided into two, wherein flashlight is transferred to transmission device 262 all the way, it is another Trigger signal of the road as pumping pulse makes time-domain filtering device 211 produce pulse pump light.

When there is pumping pulse input, flashlight is inputted from port S4, the port S5 outputs through optical circulator 232, then It exports, is inputted by the port S7 of optical circulator 251, S8 is defeated from port from first port 226 after into time-domain filtering device 211 Go out, export to the port S10 of optical circulator 292 by standby road, exported through port S12 to transmission device 262.

Situation d2, flashlight are to be sent to transmission device 261 from transmission device 262.

When no pumping pulse inputs, flashlight is inputted from the port S14 of optical circulator 293, through optical circulator 293 Port S13 enters second port 287 after entering time-domain filtering device 271, and backtracking, exports from second port 287 later, then It is secondary to enter optical circulator 293, it is exported from the port S15 of optical circulator 293, the port S6 of optical circulator 232 is transmitted to from main road, Transmission device 261 is entered by its port S4.

Specifically, flashlight passes through 1 at 262 end of transmission device:2 couplers, flashlight is divided into two, wherein believing all the way Number optical transport makes time-domain filtering device 271 produce pulse to transmission device 261, trigger signal of the another way as pumping pulse Pump light.

When there is pumping pulse input, flashlight is inputted from the port S14 of optical circulator 293, the end through optical circulator 293 The output of mouth S13 ports, exports from first port 286 to the port of optical circulator 292 after subsequently entering time-domain filtering device 271 S11 is exported from port S10, is exported to the port S8 of optical circulator 251 by standby road, is exported through port S9 to transmission device 261。

Based on the time-domain filtering device shown in above-mentioned Fig. 2 to Figure 14, Figure 15 illustrates offer of the embodiment of the present invention A kind of time-domain filtering device as switch in the case of the schematic diagram of duration that opens the light, as shown in figure 15, due to time-domain filtering Device is unrelated with polarization, it may therefore be assumed that pulse pump light is identical with signal light polarization, it is different in the case that polarizing, it is following Analysis is also the same to set up.Media units in above-mentioned Fig. 2 to Fig. 4 may be configured as Kerr media, such as with third-order non-linear General single mode fiber, it is assumed that the speed of pulse pump light is slower than flashlight, and the light path of light beam back and forth is L, that is to say, that the One flashlight is from multiplex/demultiplex unit to returning to the stroke of multiplex/demultiplex unit as L, the pulsewidth of pulse pump light For t_p.The pulse of pulse pump light and the pulse of the first flashlight concurrent multiplexing/demultiplexing unit, but because the first flashlight Pulse speed it is fast, therefore after the pulse of the first flashlight goes to terminal, the pulse of pulse pump light it is rear along can and first The t of the pulse of flashlight_pWhen the aligned in position of+t, wherein t are that the pulse of the pulse ratio pulse pump light of the first flashlight is leading Between, it can be expressed by following formula (1)：

In formula (1), L is the first flashlight from multiplex/demultiplex unit to returning to multiplex/demultiplex unit Stroke；T is the pulse lead time of the pulse ratio pulse pump light of the first flashlight；V_pSpeed for pulse pump light；V_sIt is The speed of one flashlight.

It can be seen from fig. 15 that the entire pulsewidth t of the pulse of the first flashlight_sIt is interior, only t_pThe first flashlight in the+t times Can and pulse pump light have an interaction, this interaction can introduce that preset phase is poor, such as the nonlinear phase shift for π, from And with can be come out after not carrying out the second signal interference of light of phase-modulation from first port.And the pulse of the first flashlight is other With pulse pump light nonlinear phase shift does not occur for part, therefore can be from after the second signal interference of light with not carrying out phase-modulation Second port comes out.Therefore it is final, entire time-domain filtering device as switching in the case of switch when a length of t_p+t。

As it can be seen that it by the pulsewidth of pulse that adjusts pulse pump light, fiber lengths and is chosen not in the embodiment of the present invention The first same flashlight and the wavelength of pulse pump light can realize the regulation and control to the switch duration of time-domain filtering device.Than Such as, when pulse pump light is 1550 nanometers (nm), pulse width 50ps, the first flashlight is 1310nm, at this time Picosecond every meter (ps/m), as light path L=25m, you can the switch time of 100ps is generated to flashlight.

Likewise, if the spread speed of pulse pump light is faster than the first flashlight, final entire time-domain filtering fills The switch put when it is a length of be t_s+ t ' can be represented by following formula (2)：

In formula (2), L is the first flashlight from multiplex/demultiplex unit to returning to multiplex/demultiplex unit Stroke；T ' is pulse pump light than the first flashlight lead time；V_pSpeed for pulse pump light；V_sFor the first flashlight Speed.

In the embodiment of the present invention, optionally, in order to which the length L of optical fiber can be reduced, make system more stable, it is necessary to pulse Pump light and the first flashlight have larger speed difference, also mean that and require pulse pump optical wavelength and the first signal light wavelength Interval is big, and this can just reduce interference of the pulse pump light to the first flashlight so that the noise light that pulse pump light generates Son is minimized the influence of the first flashlight.Optionally in addition, can also according to the structure of Demand Design media units, with It realizes specific function, for example increases third-order non-linear, increasing or the speed difference of diminution pump light and flashlight of structure, reduces Nonlinear noise of system etc..

Through the above as can be seen that the embodiment of the present invention crosses the equiarm Michelson interference equipped with faraday rotation mirror Instrument and pulse pump light generate nonlinear phase shift to the first flashlight Cross-phase Modulation and realize and pulse pump light and first Flashlight all polarizes unrelated extremely narrow time-domain filtering device, is a kind of low cost, low-loss device.Meanwhile based on this device It proposes to carry out time-domain filtering, the equivalent door for shortening single-photon detector with fine hybrid transmission system to quantum signal and classical signals Width reduces influence of the noise photon to system, improves the mixed transfer performance of system.

Figure 16 illustrates a kind of flow diagram of time-domain filtering method.

Based on same idea, the embodiment of the present invention provides a kind of flow diagram of time-domain filtering method, as shown in figure 16, The time-domain filtering method includes：

Step 1601, flashlight is received, and flashlight is divided into the first flashlight and second signal light；

Step 1602, instruction information is obtained, according to instruction information generation pulse pump light；In the situation for having pulse pump light Under, perform step 1603；In the case of no pulse pump light, step 1604 is performed；

Step 1603, first time phase-modulation is carried out to the phase of the first flashlight by pulse pump light, the will be carried out The polarization of the first flashlight after phase-modulation is rotated by 90 °, and obtains carrying out the of first time phase-modulation and polarization rotation One flashlight carries out the by pulse pump light to the phase for carrying out the first flashlight of first time phase-modulation and polarization rotation Quadratic phase is modulated, and is obtained polarization rotation and is carried out the first flashlight of second of phase-modulation, and polarization is rotated and carried out First flashlight of second phase-modulation and the second signal light without carrying out phase-modulation are sent to first port；

Step 1604, by no the first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation It is sent to second port.

In a kind of optionally scheme, flashlight is received by the second port of the coupling unit in above-described embodiment, And flashlight is divided into the first flashlight and second signal light, it will polarize rotate and carry out the first of second of phase-modulation later Flashlight and the first port that coupling unit is sent to without carrying out the second signal light of phase-modulation, will be without carrying out phase tune First flashlight of system and the second port that coupling unit is sent to without carrying out the second signal light of phase-modulation.

It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method or computer program product. Therefore, complete hardware embodiment, complete software embodiment or the embodiment in terms of combining software and hardware can be used in the present invention Form.It is deposited moreover, the present invention can be used to can be used in one or more computers for wherein including computer usable program code The shape of computer program product that storage media is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) Formula.

The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.

These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or The function of being specified in multiple boxes.

These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in a box or multiple boxes.

Obviously, various changes and modifications can be made to the invention without departing from model of the invention by those skilled in the art It encloses.In this way, if these modifications and changes of the present invention belongs within the scope of the claims in the present invention and its equivalent technologies, then The present invention is also intended to include these modifications and variations.

Claims

1. a kind of time-domain filtering device, which is characterized in that including coupling unit, the processing unit being connect with the coupling unit； The pulse pump light being connect with the processing unit generates unit；The coupling unit includes first port and second port；Its In：

The flashlight for receiving flashlight, and is divided into the first flashlight and second signal light, by institute by the coupling unit It states the first flashlight and is sent to the processing unit；It is receiving the polarization rotation of the processing unit transmission and is carrying out second In the case of first flashlight of phase-modulation, by it is described polarization rotate and carry out second of phase-modulation the first flashlight and The second signal light for not carrying out phase-modulation is sent to the first port of the coupling unit；It is described receiving In the case of first flashlight without carrying out phase-modulation that processing unit is sent, by no institute for carrying out phase-modulation It states the first flashlight and the second end of the coupling unit is sent to without carrying out the second signal light of phase-modulation Mouthful；

The pulse pump light generates unit, and information is indicated for obtaining, according to the instruction information generation pulse pump light；And The pulse pump light of generation is sent to the processing unit；

The processing unit, in the situation for the pulse pump light for receiving the pulse pump light generation unit transmission Under, first time phase-modulation is carried out to the phase of the first flashlight by the pulse pump light, first time phase tune will be carried out The polarization of first flashlight of system is rotated by 90 °, and is obtained the first flashlight for carrying out first time phase-modulation and polarization rotation, is led to It crosses the pulse pump light and second is carried out to the phase of the first flashlight of the progress first time phase-modulation and polarization rotation Secondary phase-modulation obtains the polarization rotation and carries out the first flashlight of second of phase-modulation, and the polarization is rotated And the first flashlight for carrying out second of phase-modulation is sent to the coupling unit；It is being not received by the pulse pump light In the case of generating the pulse pump light that unit is sent, first flashlight without carrying out phase-modulation is sent to The coupling unit.

2. time-domain filtering device as described in claim 1, which is characterized in that the coupling unit further includes third port and Four ports；The coupling unit, is used for：

Flashlight is received, and the flashlight is divided into the first flashlight and second signal light by the second port；

First flashlight is sent to by the processing unit by the third port；

The second signal light is sent by the 4th port；

The polarization rotation is received by the third port and carries out the first flashlight of second phase-modulation or described does not have There is the first flashlight for carrying out phase-modulation；

The second signal light without carrying out phase-modulation is received by the 4th port；

Second of phase-modulation of polarization rotation and progress of the processing unit transmission is being received by the third port In the case of first flashlight, the polarization received by the third port is rotated and carries out second of phase-modulation The first flashlight and be sent to by the second signal light without carrying out phase-modulation that the 4th port receives described The first port of coupling unit；

In first signal without carrying out phase-modulation that the processing unit transmission is received by the third port In the case of light, by the first flashlight without carrying out phase-modulation received by the third port and by described the The second signal light without carrying out phase-modulation that four ports receive is sent to the second port of the coupling unit.

3. time-domain filtering device as claimed in claim 1 or 2, which is characterized in that the processing unit includes：With the pulse Pump light generates the multiplex/demultiplex unit that unit is connected with the coupling unit, is connect with the multiplex/demultiplex unit Media units, the first Faraday rotation mirror unit being connect with the media units；

The multiplex/demultiplex unit, in the pulse pump for receiving the pulse pump light generation unit transmission In the case of light, first flashlight sent to the pulse pump light and the coupling unit received carries out coupling It closes, obtains the first coupled signal light；The first coupled signal light is sent to the media units；To the 4th coupled signal light Demultiplexing, obtain it is described polarization rotation and carry out second of phase-modulation the first flashlight, and by it is described polarization rotation and into First flashlight of second of phase-modulation of row is sent to the coupling unit；

The media units, for making the pulse pump light in the first coupled signal light in the media units to institute The phase for stating the first flashlight in the first coupled signal light carries out first time phase-modulation, obtains carrying out first time phase-modulation The first flashlight and the pulse pump optical coupling the second coupled signal light, and the second coupled signal light is sent to The first Faraday rotation mirror unit；Make the pulse pump light in the third coupled signal light in the media units To the progress first time phase-modulation in the third coupled signal light and polarization rotation the first flashlight phase into Second of phase-modulation of row obtains carrying out the first flashlight of second of phase-modulation and polarization rotation and the pulse pump light The 4th coupled signal light of coupling, and the 4th coupled signal light is sent to the multiplex/demultiplex unit；

The first Faraday rotation mirror unit, for it will carry out first time phase-modulation in the second coupled signal light after The polarization of first flashlight is rotated by 90 °, and obtains the first flashlight and the institute of the progress first time phase-modulation and polarization rotation State the third coupled signal light of pulse pump optical coupling；The third coupled signal light is sent to the media units.

4. time-domain filtering device as claimed in claim 3, which is characterized in that the multiplex/demultiplex unit is additionally operable to：

In the case where not receiving the pulse pump light and generating the pulse pump light that unit is sent, the institute that will receive First flashlight for stating coupling unit transmission is sent to the first Faraday rotation mirror unit by the media units；

The first Faraday rotation mirror unit, is used for:

The polarization of first flashlight received is rotated by 90 °, is obtained described without described the first of progress phase-modulation Flashlight；By it is described without carry out phase-modulation first flashlight pass sequentially through the media units and it is described multiplexing/ Demultiplexing unit is sent to the coupling unit.

5. the time-domain filtering device as described in Claims 1-4 any claim, which is characterized in that the time-domain filtering dress Put the second Faraday rotation mirror unit for further including and being connect with the coupling unit；

The second Faraday rotation mirror unit, is used for：

The second signal light that the coupling unit is sent is received, the polarization of the second signal light is rotated by 90 °, obtains institute It states the second signal light for not carrying out phase-modulation, and the second signal light without carrying out phase-modulation is sent to described Coupling unit；

The coupling unit, is used for：

In the situation for the polarization rotation and the first flashlight for carrying out second of phase-modulation for receiving the processing unit transmission Under, by the second of first flashlight and no progress phase-modulation of the polarization rotation and second of phase-modulation of progress Flashlight is sent to the first port of the coupling unit；Receiving the described without carrying out phase of the processing unit transmission In the case of first flashlight of modulation, by first flashlight without carrying out phase-modulation and no progress phase The second signal light of modulation is sent to the second port of the coupling unit.

6. the time-domain filtering device as described in Claims 1-4 any claim, which is characterized in that the time-domain filtering dress It puts and further includes：The attenuation units being connect with the coupling unit, the second faraday rotation mirror list being connect with the attenuation units Member；

The attenuation units, are used for：

The second signal light that the coupling unit is sent is received, the second signal light is subjected to attenuation of the first kind, obtains first Second signal light after the attenuation of the first kind is sent to the second faraday rotation mirror list by second signal light after secondary attenuation Member；The second signal light for carrying out attenuation of the first kind and polarization rotation that the second Faraday rotation mirror unit is sent is received, it will The second signal light progress attenuation of the second kind for carrying out attenuation of the first kind and polarization rotation, obtains described without carrying out phase tune The second signal light without carrying out phase-modulation is sent to the coupling unit by the second signal light of system；

The second Faraday rotation mirror unit, is used for：

Second signal light after the attenuation of the first kind that the attenuation units are sent is received, by the second letter after the attenuation of the first kind The polarization of number light is rotated by 90 °, and obtains the second signal light for carrying out attenuation of the first kind and polarization rotation, and carries out the by described The second signal light of primary attenuation and polarization rotation is sent to the attenuation units；

The coupling unit, is used for：

In the first flashlight for receiving the polarization rotation of the processing unit transmission and carrying out second of phase-modulation In the case of, by first flashlight and no progress phase-modulation of the polarization rotation and second of phase-modulation of progress Second signal light is sent to the first port of the coupling unit；Receiving that the processing unit sends without carrying out phase In the case of first flashlight of modulation, described carry out no first flashlight for carrying out phase-modulation and not The second signal light of phase-modulation is sent to the second port of the coupling unit.

7. the time-domain filtering device as described in claim 1 to 6 any claim, which is characterized in that the flashlight is amount Sub-light signal, first flashlight are the first quantum optical signal, and the second signal light is the second quantum optical signal；Described Single port connects quantum optical signal receiver；

The pulse pump light generates unit, is used for：

Receive synchronous optical signal；

The instruction information is determined according to the synchronous optical signal；Wherein, the instruction information indicates the quantum optical signal Burst length information；

The pulse pump light is generated according to the instruction information；Wherein, the burst length information of the pulse pump light with The burst length information matches of the quantum optical signal.

8. a kind of time-domain filtering method, which is characterized in that including：

Flashlight is received, and the flashlight is divided into the first flashlight and second signal light；

Instruction information is obtained, according to the instruction information generation pulse pump light；

In the case where there is the pulse pump light, the phase of the first flashlight is carried out for the first time by the pulse pump light The polarization of the first flashlight after progress first time phase-modulation is rotated by 90 ° by phase-modulation, obtains carrying out first time phase Modulation and polarization rotation first flashlight, by the pulse pump light to it is described progress first time phase-modulation and partially The phase of the first flashlight of rotation of shaking carries out second of phase-modulation, obtains polarization rotation and carries out second phase-modulation First flashlight, and the polarization is rotated and carries out the first flashlight of second phase-modulation and described does not carry out The second signal light of phase-modulation is sent to first port；

In the case of no pulse pump light, by first flashlight without carrying out phase-modulation and described do not have The second signal light for carrying out phase-modulation is sent to second port.

9. time-domain filtering method as claimed in claim 8, which is characterized in that the reception flashlight, and by the flashlight It is divided into the first flashlight and second signal light, including：

Flashlight is received by the second port；

The flashlight is divided into first flashlight and the second signal light；

First flashlight is sent by third port, the second signal light is sent by the 4th port；

First flashlight and the institute without carrying out phase-modulation by the polarization rotation and second of phase-modulation of progress It states second signal light and is sent to first port, including：

By the polarization received by the third port rotate and carry out second of phase-modulation the first flashlight and It is sent to described in the coupling unit by the second signal light without carrying out phase-modulation that the 4th port receives First port；

It is described by it is no carry out phase-modulation first flashlight and without carry out phase-modulation the second signal light Second port is sent to, including：

By by the third port receive without carry out phase-modulation the first flashlight and by the 4th port The second signal light without carrying out phase-modulation received is sent to the second port of the coupling unit.

10. time-domain filtering method as claimed in claim 8 or 9, which is characterized in that described in the feelings for having the pulse pump light Under condition, first time phase-modulation is carried out to the phase of the first flashlight by the pulse pump light, first time phase will be carried out The polarization of modulated first flashlight is rotated by 90 °, and obtains the first signal for carrying out first time phase-modulation and polarization rotation Light carries out the phase of the first flashlight of the progress first time phase-modulation and polarization rotation by the pulse pump light Second of phase-modulation obtains the polarization rotation and carries out the first flashlight of second of phase-modulation, including：

In the case where there is the pulse pump light, the pulse pump light and first flashlight are coupled, obtained First coupled signal light；

The first coupled signal light is sent to media units, passes through the pulse pump in the first coupled signal light Light carries out first time phase-modulation in the media units to the phase of the first flashlight in the first coupled signal light, obtains To the second coupled signal light of the first flashlight and the pulse pump optical coupling for carrying out first time phase-modulation；

The polarization of the first flashlight after progress first time phase-modulation in the second coupled signal light is rotated by 90 °, is obtained First flashlight for carrying out first time phase-modulation and polarizing rotation couples letter with the third of the pulse pump optical coupling Number light；

The third coupled signal light is sent to the media units, passes through the pulse in the third coupled signal light Pump light is in the media units to carry out first time phase-modulation and polarization rotation the in the third coupled signal light The phase of one flashlight carries out second of phase-modulation, obtains the first flashlight for carrying out second of phase-modulation and polarization rotation With the 4th coupled signal light of the pulse pump optical coupling；

To the 4th coupled signal Optical Demultiplexing, obtain the polarization rotation and carry out the first flashlight of second of phase-modulation.

11. the time-domain filtering method as described in claim 8 to 10 any claim, which is characterized in that described in no institute In the case of stating pulse pump light, by no first flashlight for carrying out phase-modulation and the institute without carrying out phase-modulation It states second signal light to be sent to before second port, further include：

In the case of no pulse pump light, the polarization of first flashlight is rotated by 90 °, obtains described not having Carry out first flashlight of phase-modulation.

12. the time-domain filtering method as described in claim 8 to 11 any claim, which is characterized in that it is described will it is described partially It shakes and rotation and carries out the first flashlight of second phase-modulation and the second signal light without carrying out phase-modulation is sent To first port, including：

The polarization of the second signal light is rotated by 90 °, obtains the second signal light without carrying out phase-modulation；It will The polarization rotation and first flashlight of second of phase-modulation of progress and the second signal without carrying out phase-modulation Light is sent to the first port；

The polarization of the second signal light is rotated by 90 °, obtains the second signal light without carrying out phase-modulation；It will Do not carry out first flashlight of phase-modulation and the second signal light without carrying out phase-modulation be sent to it is described Second port.

13. the time-domain filtering method as described in claim 8 to 11 any claim, which is characterized in that it is described will it is described partially It shakes and rotation and carries out the first flashlight of second phase-modulation and the second signal light without carrying out phase-modulation is sent To first port, including：

The second signal light is subjected to attenuation of the first kind, obtains second signal light after attenuation of the first kind；The first time is declined The polarization for subtracting rear second signal light is rotated by 90 °, and obtains the second signal light for carrying out attenuation of the first kind and polarization rotation；By institute The second signal light for stating progress attenuation of the first kind and polarization rotation is decayed, and is obtained described without the second of progress phase-modulation Flashlight, by first flashlight and no progress phase-modulation of the polarization rotation and second of phase-modulation of progress Second signal light is sent to the first port；

It is described by it is no carry out phase-modulation first flashlight and it is described without progress phase-modulation second signal light Second port is sent to, including：

The second signal light is subjected to attenuation of the first kind, obtains second signal light after attenuation of the first kind；The first time is declined The polarization for subtracting rear second signal light is rotated by 90 °, and obtains the second signal light for carrying out attenuation of the first kind and polarization rotation；By institute The second signal light for stating progress attenuation of the first kind and polarization rotation is decayed, and is obtained described without the second of progress phase-modulation Flashlight sends out no first flashlight for carrying out phase-modulation and the second signal light without carrying out phase-modulation It send to the second port.

14. the time-domain filtering method as described in claim 8 to 13 any claim, which is characterized in that the flashlight is Quantum optical signal, first flashlight are the first quantum optical signal, and the second signal light is the second quantum optical signal；It is described First port connects quantum optical signal receiver；

It is described to obtain instruction information, pulse pump light is generated according to the instruction information, including：

Receive synchronous optical signal；