CN107135034B - A kind of system and method measuring fibre-optical dispersion - Google Patents
A kind of system and method measuring fibre-optical dispersion Download PDFInfo
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- CN107135034B CN107135034B CN201710474217.XA CN201710474217A CN107135034B CN 107135034 B CN107135034 B CN 107135034B CN 201710474217 A CN201710474217 A CN 201710474217A CN 107135034 B CN107135034 B CN 107135034B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07951—Monitoring or measuring chromatic dispersion or PMD
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Abstract
The invention discloses a kind of system and methods for measuring fibre-optical dispersion, comprising: emits laser by continuous wave laser；The time energy entangled photon pairs of the nondegenerate of wide range are generated using spontaneous four-wave mixing nonlinear effect caused by laser；The time energy entangled photon pairs of the nondegenerate of wide range and remaining laser are filtered by bandpass filter, obtain the time energy entangled photon pairs that wavelength is located at the nondegenerate in band logical section；Few a pair of photon with time energy Entanglement is elected to from the time energy entangled photons pair for the nondegenerate for being located at band logical section by the wavelength after dispersion compensating fiber；The time difference that each pair of photon with time energy Entanglement reaches binary channels single-photon detector is recorded, each pair of photon with time energy Entanglement reaches the time difference of binary channels single-photon detector for determining dispersion compensating fiber in the abbe number of each wavelength points.The present invention can reduce fibre-optical dispersion measurement cost by the continuous wave laser of low cost.
Description
Technical field
The invention belongs to optical waveguide chromatic dispersion measurement technical fields, more particularly, to a kind of system for measuring fibre-optical dispersion
And method.
Background technique
In high-speed optical transmission system, fibre-optical dispersion is one of the important parameter for influencing transmission performance.Because dispersion is deposited
The transmission rate of the light of different wave length in a fiber is different.And the optical signal that transmits in a fiber and be not monochromatic
Wave, therefore pulse will be broadened, and further result between adjacent pattern and crosstalk occur, to influence communication quality.Therefore exist
It needs to compensate the dispersion of transmission fiber using dispersion compensation device in optical transmission system, then the premise of dispersion compensation is
The abbe number for needing to treat compensated optical fiber and dispersion compensation device measures.
The method of chromatic dispersion measurement mainly has time delay method, phase shift method and interferometry etc. at present.This few class method respectively has disadvantage,
Time delay method needs the pulse laser of higher cost, and measurement accuracy is not high.Light source requirements needed for phase shift method have top adjustment essence
Degree, to keep single unit system cost very high.Interferometry is readily incorporated error in the process in the relevant of two-beam, causes measured value
Deviation.
Summary of the invention
In view of the drawbacks of the prior art, it is an object of the invention to solve existing chromatic dispersion measurement method to need to swash using pulse
Light device higher cost and the not high technical problem of measurement accuracy.
To achieve the above object, in a first aspect, the embodiment of the invention provides a kind of system for measuring fibre-optical dispersion, packet
It includes: continuous wave laser, silicon nanowires waveguide, bandstop filter, wavelength division multiplexer, binary channels single-photon detector and time phase
Close single photon counter；The continuous wave laser is for emitting laser；The silicon nanowires waveguide under laser pump (ing) for producing
It is born from hair four-wave mixing nonlinear effect, and then generates the time energy entangled photon pairs of the nondegenerate of wide range；The band resistance filter
Wave device is used to be filtered the time energy entangled photon pairs of the nondegenerate of generated wide range and remaining laser, obtains wave
The time energy entangled photon pairs of the long nondegenerate for being located at its band logical section, the remaining laser are that the four-wave mixing is non-thread
The property unconsumed laser of effect；The wavelength division multiplexer from by the time energy of the nondegenerate after dispersion compensating fiber for entangling
It twines and selects at least a pair of photon with time energy Entanglement in photon pair；The binary channels single-photon detector is for connecing
Enter at least a pair of photon with time energy Entanglement, each pair of photon with time energy Entanglement reaches institute
The time difference for stating binary channels single-photon detector is different；The Single Photon Counting device is each pair of with the time for recording
The photon of energy Entanglement reaches the time difference of the binary channels single-photon detector, and described each pair of there is time energy to tangle
Time difference that the photon of characteristic reaches the binary channels single-photon detector is used for each pair of with time energy Entanglement
The corresponding wavelength of photon determines the dispersion compensating fiber in the abbe number of each wavelength points jointly, and described each pair of have time energy
Measure Entanglement the corresponding wavelength of photon according to the wave of the laser and for select this to photon used in wavelength-division multiplex
The channel of device is long to be determined.
The present invention passes through using lower-cost continuous wave laser as laser light source, and caused certainly using laser light source
The time energy entangled photon pairs that four-wave mixing nonlinear effect generates the nondegenerate of wide range are sent out, existing pulse laser etc. is replaced
Expensive laser source, the requirement to laser light source is lower, easy to operate.The present invention has time energy by multipair simultaneously
The photon of Entanglement determines dispersion compensating fiber in the abbe number of each wavelength points, it is ensured that measurement accuracy.
Optionally, the system of fibre-optical dispersion is measured further include: EDFA Erbium-Doped Fiber Amplifier and bandpass filter；It is described to mix bait light
Fiber amplifier is used to amplify the power of continuous wave laser transmitting laser；The bandpass filter is for filtering out institute
The sideband noise of laser after stating power amplification, and will filter out the laser output of sideband noise, it is described for generating wide range
The laser of the time energy entangled photon pairs of nondegenerate is the laser of bandpass filter output.
Optionally, the system of fibre-optical dispersion is measured further include: Polarization Controller；The Polarization Controller is described for adjusting
The polarization state of the laser of bandpass filter output, to obtain the effect of the Best Coupling between the laser and silicon nanowires waveguide
Rate.
Optionally, the corresponding range of wavelengths in band logical area of the bandstop filter does not include the wavelength of the laser.
Optionally, the dispersion compensating fiber is determined in the abbe number D (λ) of each wavelength points by following formula；
Wherein, λ is the optical maser wavelength by the dispersion compensating fiber, τg(λ) is to be caused by the dispersion compensating fiber
Time delay, τg(λ)=a λ2+bλ-2+ c, a and b reach the binary channels according to each pair of photon with time energy Entanglement
The time difference of single-photon detector and the corresponding wavelength of each pair of photon with time energy Entanglement determine, especially by with
Lower formula determines:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0
Wherein, τg(λin) and τg(λsn) it is respectively that n is caused idler photon and signal photon by the dispersion compensating fiber
Time delay, tnThe time difference of the binary channels single-photon detector, t are reached for n-th pair of idler photon and signal photon0It is described
Electricity delay between two channel of binary channels single-photon detector, each pair of photon with time energy Entanglement includes ideler frequency light
Son and signal photon, λinAnd λsnThe wavelength of respectively n-th pair idler photon and signal photon, the wavelength of the laser are λp, institute
The wavelength for stating n-th pair of idler photon and signal photon is determined by following formula:
Second aspect, the embodiment of the invention provides a kind of methods for measuring fibre-optical dispersion, comprising: passes through continuous wave laser
Emit laser；Light is tangled using the time energy that spontaneous four-wave mixing nonlinear effect caused by laser generates the nondegenerate of wide range
Son is right；The time energy entangled photon pairs of the nondegenerate of the wide range and remaining laser are filtered by bandpass filter
Wave obtains the time energy entangled photon pairs that wavelength is located at the nondegenerate in band logical section；Wave after passing through dispersion compensating fiber
It is elected in the time energy entangled photons pair of the long nondegenerate for being located at band logical section few a pair of with time energy Entanglement
Photon；It is each pair of by binary channels single-photon detector access at least a pair of photon with time energy Entanglement
The time difference that photon with time energy Entanglement reaches the binary channels single-photon detector is different；Recording each pair of has
The photon of time energy Entanglement reaches the time difference of the binary channels single-photon detector, described each pair of with time energy
The time difference that the photon of Entanglement reaches the binary channels single-photon detector is used to have time energy to tangle spy with each pair of
Property the corresponding wavelength of photon determine jointly the dispersion compensating fiber in the abbe number of each wavelength points, it is described each pair of when having
Between energy Entanglement the corresponding wavelength of photon according to the wavelength of the laser and for select this to photon used in wave
The channel of division multiplexer determines.
Optionally, the method for fibre-optical dispersion is measured further include: put to the power of continuous wave laser transmitting laser
Greatly；The sideband noise of laser after filtering out the power amplification, and will filter out the laser output of sideband noise, it is described to be used for
The laser for generating the time energy entangled photon pairs of the nondegenerate of wide range is the laser for filtering out sideband noise.
Optionally, the method for fibre-optical dispersion is measured further include: the polarization state of the laser of the bandpass filter output is adjusted,
To obtain the optimistic coupling efficiency between the laser and silicon nanowires waveguide, the silicon nanowires waveguide is used in laser pump
Spontaneous four-wave mixing nonlinear effect is generated under Pu.
Optionally, the corresponding range of wavelengths in the band logical area does not include the wavelength of the laser.
Optionally, the dispersion compensating fiber is determined in the abbe number D (λ) of each wavelength points by following formula；
Wherein, λ is the optical maser wavelength by the dispersion compensating fiber, τg(λ) is to be caused by the dispersion compensating fiber
Time delay, τg(λ)=a λ2+bλ-2+ c, a and b reach the binary channels according to each pair of photon with time energy Entanglement
The time difference of single-photon detector and the corresponding wavelength of each pair of photon with time energy Entanglement determine, especially by with
Lower formula determines:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0
Wherein, τg(λin) and τg(λsn) it is respectively that n is caused idler photon and signal photon by the dispersion compensating fiber
Time delay, tnThe time difference of the binary channels single-photon detector, t are reached for n-th pair of idler photon and signal photon0It is described
Electricity delay between two channel of binary channels single-photon detector, each pair of photon with time energy Entanglement includes ideler frequency light
Son and signal photon, λinAnd λsnThe wavelength of respectively n-th pair idler photon and signal photon, the wavelength of the laser are λp, institute
The wavelength for stating n-th pair of idler photon and signal photon is determined by following formula:
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
The present invention passes through using lower-cost continuous wave laser as laser light source, and caused certainly using laser light source
The time energy entangled photon pairs that four-wave mixing nonlinear effect generates the nondegenerate of wide range are sent out, existing pulse laser etc. is replaced
Expensive laser source, the requirement to laser light source is lower, easy to operate.The present invention has time energy by multipair simultaneously
The photon of Entanglement determines dispersion compensating fiber in the abbe number of each wavelength points, it is ensured that measurement accuracy.
Detailed description of the invention
Fig. 1 is a kind of system structure diagram for measuring fibre-optical dispersion provided in an embodiment of the present invention；
Electric Time delay measurement fitted figure of the Fig. 2 between two channel of binary channels single-photon detector；
Electric Time delay measurement and multipair time energy entangled photons of the Fig. 3 between two channel of binary channels single-photon detector
To the measurement fitted figure of the time delay introduced by dispersion compensating fiber；
Fig. 4 is the abbe number and wavelength relationship figure of the dispersion compensating fiber of measurement of the embodiment of the present invention；
Fig. 5 is a kind of method flow schematic diagram for measuring fibre-optical dispersion provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is a kind of structural schematic diagram of system for measuring fibre-optical dispersion provided in an embodiment of the present invention.As shown in Figure 1,
It include: continuous wave laser 1, EDFA Erbium-Doped Fiber Amplifier 2, bandpass filter 3, Polarization Controller 4, silicon nanowires waveguide 5, band resistance filter
Wave device 6, dispersion compensating fiber 7, wavelength division multiplexer 8, binary channels single-photon detector 9 and the single photon counter of time correlation
10。
The laser that continuous wave laser 1 exports carries out power amplification by EDFA Erbium-Doped Fiber Amplifier 2, adjustable subsequently into bandwidth
Bandpass filter 3 in, bandpass filter 3 is used to inhibit the sideband noise of laser.By amplification and filtered laser and partially
The controller 4 that shakes is connected, and enters in silicon nanowires waveguide 5 from the laser come out in Polarization Controller 4 by vertical coupled, polarization control
Device 4 processed is used to adjust the polarization state of laser, to obtain the time energy for inspiring nondegenerate in laser and silicon nanowires waveguide 5
Entangled photon pairs optimistic coupling efficiency.Under the spontaneous four-wave mixing mechanism of degeneracy, laser inspires in silicon nanowires waveguide 5
The time energy entangled photon pairs of nondegenerate.The photon that remaining laser and the time energy of generation tangle is to by vertical coupled
From entering in the fixed bandstop filter 6 of bandwidth in silicon nanowires waveguide 5, bandstop filter 6 is used to that remaining laser is isolated, and
Time energy entangled photon pairs can then pass through bandstop filter 6.The time energy entangled photons come out from bandstop filter 6
To entering in dispersion compensating fiber 7, under dispersion compensating fiber dispersion interaction, when the photon of different wave length will obtain different
Prolong.The photon come out from dispersion compensating fiber meets time energy to entering in wavelength division multiplexer 8, using the selection of wavelength division multiplexer 8
At least a pair of of the photon tangled is measured, is then exported respectively from the corresponding port of wavelength division multiplexer 8.It is come out from wavelength division multiplexer 8
Time energy entangled photon pairs respectively enter two channels of binary channels single-photon detector 9, two channels of single-photon detector
The electric signal of generation is recorded by the single photon counter 10 of time correlation, so as to obtain two that each pair of time energy tangles
A photon reaches the time difference of single-photon detector 9, caused by which is exactly the dispersion by astigmatic optical fiber.
It should be noted that p shown in FIG. 1 represent continuous wave laser 1 transmitting laser, behalf signal photon signal,
I represents idler photon idler.
Optionally, the dispersion compensating fiber is determined in the abbe number D (λ) of each wavelength points by following formula；
Wherein, λ is the optical maser wavelength by the dispersion compensating fiber, τg(λ) is to be caused by the dispersion compensating fiber
Time delay, τg(λ)=a λ2+bλ-2+ c, a and b reach the binary channels according to each pair of photon with time energy Entanglement
The time difference of single-photon detector and the corresponding wavelength of each pair of photon with time energy Entanglement determine, especially by with
Lower formula determines:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0
Wherein, τg(λin) and τg(λsn) it is respectively that n is caused idler photon and signal photon by the dispersion compensating fiber
Time delay, tnThe time difference of the binary channels single-photon detector, t are reached for n-th pair of idler photon and signal photon0It is described
Electricity delay between two channel of binary channels single-photon detector, each pair of photon with time energy Entanglement includes ideler frequency light
Son and signal photon, λinAnd λsnThe wavelength of respectively n-th pair idler photon and signal photon, the wavelength of the laser are λp, institute
The wavelength for stating n-th pair of idler photon and signal photon is determined by following formula:
In a specific example, continuous wave laser 1 can be the continuous solid body laser of a Wavelength tunable, at this
In invention, the laser center wavelength that continuous wave laser 1 exports is 1550.116nm, line width 300MHz, power 0dBm.Mix bait
Fiber amplifier 2 works in C-band, and the laser power for exporting continuous wave laser 1 is amplified to 25dBm.C-band is
1530nm-1565nm。
3 operating central wavelength of bandpass filter is 1550.116nm, three dB bandwidth 0.1nm, isolation 50dB, insertion loss
5dB.Polarization Controller 4 is used to manually adjust the polarization state of laser, to obtain optimal vertical coupled efficiency, Polarization Controller
Insertion loss is 0.5dB.Silicon nanowires 5 is produced on silicon-on-insulator (SOI).Waveguide cross-section size are as follows: wide 470nm, height
220nm, waveguide length 6mm, waveguide incidence end and exit end are the vertical coupled grating of photonic crystal.
6 operating central wavelength of bandstop filter is 1549.6nm, line width 5nm, insertion loss 2dB.Dispersion compensating fiber 7 is inserted
Enter 1.7dB is lost.Wavelength division multiplexer 8 is array waveguide grating type, and covered wavelength wavelength operating range is 1528.516nm-
1560.516nm.With 1 incidence channel, 40 exit channels, each exit channel three dB bandwidth is 0.62nm, adjacency channel
0.8nm is divided between central wavelength.Binary channels single-photon detector 9 is near-infrared single photon detector, operation wavelength 900nm-
1700nm, the present invention in two channels parameter setting it is completely the same: quantum efficiency 25%, gate-width 20ns, death time
For 10 μ s, clock frequency 2.5MHz.Single Photon Counting device 10 and the combination of single-photon detector 9 are used to complete to the time
The coincidence measurement of energy entangled photon pairs.
Chromatic dispersion measurement process is as follows in this embodiment:
1, wavelength λpThe laser of=1550.116nm inspires time energy entangled photon pairs in silicon nanowires waveguide 5
Physical process are as follows: wavelength λpTwo lasertrons bury in oblivion, while generating wavelength is λsSignal photon and a wavelength
For λiIdler photon, and this physical process meets the conservation of energy, i.e. λs,λiAnd λpMeet relational expression (1):
2, firstly, the photon that tangles of time energy come out from bandstop filter 6 is to without dispersion compensating fiber 7, and
It is to be directly entered wavelength division multiplexer 8.λ is selected using two channels of 8 exit end of wavelength division multiplexers=1546.915nm and λi=
The time energy entangled photon pairs for meeting the conservation of energy of 1553.324nm.This is directly accessed binary channels single-photon detecting to photon
Device 8 is surveyed, coincidence counting reaches the time difference of detector as shown in Fig. 2, obtaining two photons by Gauss curve fitting as t0=
15039.838ps。t0Electricity delay between two channel of binary channels single-photon detector.
3, the two-photon then, come out from bandstop filter 6 is advanced to cross dispersion compensating fiber 7, multiple subsequently into wavelength-division
Meet conservation of energy time energy entangled photon pairs in device 8, first filtering out the 1st pair using wavelength division multiplexer, then to its into
Row meets detection and carries out Gauss curve fitting to coincidence counting, obtains the time t that two photons reach detector1.Similarly, it recycles
Wavelength division multiplexer 8 selects the 2nd, 3 ... ..., and n (1≤n≤10) carries out the time energy entangled photons for meeting the conservation of energy respectively
Coincidence measurement (measurement result is as shown in Figure 3) obtains the time difference t that two photons in n-th pair of photon reach detectorn(such as 1 institute of table
Show).
Wherein, the second row " NO DCF " expression two-photon is without dispersive optical fiber, therefore corresponds to t0=
15039.838ps and t0Electricity delay between two channel of binary channels single-photon detector.
Table 1
4, n-th couple of idler photon λ as caused by dispersion compensating fiberinWith signal photon λsnBetween delay inequality are as follows:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=tn-t0 (2)
When the photon that wavelength is λ passes through dispersion compensating fiber, the time delay as caused by dispersion compensating fiber can be by three ranks
The description of Sellmeier function:
τg(λ)=a λ2+bλ-2+c (3)
So formula (2) can be written as:
Δτg(λin,λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0 (4)
Utilize the t measuredn-t0And its corresponding λsn,λinValue obtains the parameter in formula (4) by fitting:
A=-0.2675ps/nm2
B=-9.1327 × 1011ps.nm2
Therefore, the abbe number of dispersion compensating fiber is represented by formula (5):
By photon that wavelength is λ, it is brought formula (5) into and can find out dispersion compensating fiber abbe number D (λ), as a result as schemed
Shown in 4.
Correspondingly, Fig. 5 is a kind of method flow schematic diagram for measuring fibre-optical dispersion provided in an embodiment of the present invention, as schemed institute
Show, including step S101 to step S106.
S101 emits laser by continuous wave laser.
S102 is entangled using the time energy that spontaneous four-wave mixing nonlinear effect caused by laser generates the nondegenerate of wide range
Twine photon pair.
S103, by bandpass filter to the time energy entangled photon pairs of the nondegenerate of the wide range and remaining laser
It is filtered, obtains the time energy entangled photon pairs that wavelength is located at the nondegenerate in band logical section, the remaining laser is institute
State the unconsumed laser of four-wave mixing nonlinear effect.
S104, from the time energy entangled photons for the nondegenerate for being located at band logical section by the wavelength after dispersion compensating fiber
At least a pair of photon with time energy Entanglement is selected in.
S105 passes through binary channels single-photon detector access at least a pair of light with time energy Entanglement
Son, the time difference that each pair of photon with time energy Entanglement reaches the binary channels single-photon detector are different.
S106, record each pair of photon with time energy Entanglement reach the binary channels single-photon detector when
Between it is poor, the time difference that each pair of photon with time energy Entanglement reaches the binary channels single-photon detector is used for
With each pair of there is the corresponding wavelength of the photon of time energy Entanglement to determine the dispersion compensating fiber in each wavelength points jointly
Abbe number, each pair of corresponding wavelength of photon with time energy Entanglement according to the wavelength of the laser and
For selecting the channel determination to wavelength division multiplexer used in photon.
Optionally, the method for fibre-optical dispersion is measured further include: put to the power of continuous wave laser transmitting laser
Greatly；The sideband noise of laser after filtering out the power amplification, and will filter out the laser output of sideband noise, it is described to be used for
The laser for generating the time energy entangled photon pairs of the nondegenerate of wide range is the laser for filtering out sideband noise.
Optionally, the method for fibre-optical dispersion is measured further include: the polarization state of the laser of the bandpass filter output is adjusted,
To obtain the optimistic coupling efficiency between the laser and silicon nanowires waveguide, the silicon nanowires waveguide is used in laser pump
Spontaneous four-wave mixing nonlinear effect is generated under Pu.
Optionally, the corresponding range of wavelengths in the band logical area does not include the wavelength of the laser.
More than, the only preferable specific embodiment of the application, but the protection scope of the application is not limited thereto, and it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be subject to the protection scope in claims.
Claims (8)
1. a kind of system for measuring fibre-optical dispersion characterized by comprising continuous wave laser, silicon nanowires waveguide, bandreject filtering
Device, dispersion compensating fiber, wavelength division multiplexer, binary channels single-photon detector and Single Photon Counting device；
The continuous wave laser is for emitting laser；
The silicon nanowires waveguide generates wide range for generating spontaneous four-wave mixing nonlinear effect under laser pump (ing)
The time energy entangled photon pairs of nondegenerate；
The bandstop filter is used for time energy entangled photon pairs and remaining laser to the nondegenerate of generated wide range
It is filtered, obtains the time energy entangled photon pairs that wavelength is located at the nondegenerate in its band logical section, the remaining laser is
The unconsumed laser of four-wave mixing nonlinear effect；
The time energy for the nondegenerate that the dispersion compensating fiber is used to be located at bandstop filter band logical section to wavelength tangles light
Son is to dispersion interaction is carried out, so that the photon of different wave length obtains different time delays；
The wavelength division multiplexer is used to from the time energy entangled photons pair by the nondegenerate after dispersion compensating fiber select
At least a pair of photon with time energy Entanglement；
The binary channels single-photon detector is used to access at least a pair of photon with time energy Entanglement, each pair of
The time difference that photon with time energy Entanglement reaches the binary channels single-photon detector is different；
The Single Photon Counting device is used to record each pair of photon with time energy Entanglement and reaches described pair
The time difference of channel one-photon detector, each pair of photon with time energy Entanglement reach the binary channels monochromatic light
The time difference of sub- detector is used to have the corresponding wavelength of the photon of time energy Entanglement to determine the color jointly with each pair of
Dissipate abbe number of the compensated optical fiber in each wavelength points, each pair of corresponding wavelength root of photon with time energy Entanglement
According to the wavelength of the laser and for selecting the channel determination to wavelength division multiplexer used in photon；
The dispersion compensating fiber is determined in the abbe number D (λ) of each wavelength points by following formula；
Wherein, λ is the optical maser wavelength by the dispersion compensating fiber, τgWhen (λ) is as caused by the dispersion compensating fiber
Prolong, τg(λ)=a λ2+bλ-2+ c, a and b reach the binary channels monochromatic light according to each pair of photon with time energy Entanglement
The time difference of sub- detector and the corresponding wavelength of each pair of photon with time energy Entanglement determine, especially by following public affairs
Formula determines:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0
Wherein, τg(λin) and τg(λsn) be respectively n to idler photon and signal photon as caused by the dispersion compensating fiber when
Prolong, tnThe time difference of the binary channels single-photon detector, t are reached for n-th pair of idler photon and signal photon0For the bilateral
Electricity delay between two channel of road single-photon detector, each pair of photon with time energy Entanglement include idler photon with
Signal photon, λinAnd λsnThe wavelength of respectively n-th pair idler photon and signal photon, the wavelength of the laser are λp, described n-th
The wavelength of idler photon and signal photon is determined by following formula:
2. the system of measurement fibre-optical dispersion according to claim 1, which is characterized in that further include: EDFA Erbium-Doped Fiber Amplifier
And bandpass filter；
The EDFA Erbium-Doped Fiber Amplifier is used to amplify the power of continuous wave laser transmitting laser；
The bandpass filter is used to filter out the sideband noise of the laser after the power amplification, and will filter out sideband noise
Laser output, it is described for generate wide range nondegenerate time energy entangled photon pairs laser be the bandpass filter
The laser of output.
3. the system of measurement fibre-optical dispersion according to claim 2, which is characterized in that further include: Polarization Controller；
The Polarization Controller is used to adjust the polarization state of the laser of bandpass filter output, so as to obtain the laser with
Optimistic coupling efficiency between silicon nanowires waveguide.
4. the system of measurement fibre-optical dispersion according to claim 1, which is characterized in that the band logical area of the bandstop filter
Corresponding range of wavelengths does not include the wavelength of the laser.
5. a kind of method for measuring fibre-optical dispersion characterized by comprising
Emit laser by continuous wave laser；
The time energy entangled photon pairs of the nondegenerate of wide range are generated using spontaneous four-wave mixing nonlinear effect caused by laser；
The time energy entangled photon pairs of the nondegenerate of the wide range and remaining laser are filtered by bandstop filter,
The time energy entangled photon pairs that wavelength is located at the nondegenerate in band logical section are obtained, the remaining laser is the four-wave mixing
The unconsumed laser of nonlinear effect；
It is located at the time energy entangled photon pairs of the nondegenerate in bandstop filter band logical section to wavelength by dispersion compensating fiber
Dispersion interaction is carried out, so that the photon of different wave length obtains different time delays；
It is selected from the time energy entangled photons pair for the nondegenerate for being located at band logical section by the wavelength after dispersion compensating fiber
At least a pair of photon with time energy Entanglement；
It is each pair of to have by binary channels single-photon detector access at least a pair of photon with time energy Entanglement
The time difference that the photon of time energy Entanglement reaches the binary channels single-photon detector is different；
The time difference that each pair of photon with time energy Entanglement reaches the binary channels single-photon detector is recorded, it is described
The time difference that each pair of photon with time energy Entanglement reaches the binary channels single-photon detector is used for and each pair of tool
The corresponding wavelength of photon of having time energy Entanglement determines the dispersion compensating fiber in the dispersion system of each wavelength points jointly
Number, each pair of corresponding wavelength of photon with time energy Entanglement is according to the wavelength of the laser and for selecting
The channel to wavelength division multiplexer used in photon determines；
The dispersion compensating fiber is determined in the abbe number D (λ) of each wavelength points by following formula；
Wherein, λ is the optical maser wavelength by the dispersion compensating fiber, τgWhen (λ) is as caused by the dispersion compensating fiber
Prolong, τg(λ)=a λ2+bλ-2+ c, a and b reach the binary channels monochromatic light according to each pair of photon with time energy Entanglement
The time difference of sub- detector and the corresponding wavelength of each pair of photon with time energy Entanglement determine, especially by following public affairs
Formula determines:
Δτg(λin,λsn)=τg(λin)-τg(λsn)=a (λin 2-λsn 2)+b(λin -2-λsn -2)=tn-t0
Wherein, τg(λin) and τg(λsn) be respectively n to idler photon and signal photon as caused by the dispersion compensating fiber when
Prolong, tnThe time difference of the binary channels single-photon detector, t are reached for n-th pair of idler photon and signal photon0For the bilateral
Electricity delay between two channel of road single-photon detector, each pair of photon with time energy Entanglement include idler photon with
Signal photon, λinAnd λsnThe wavelength of respectively n-th pair idler photon and signal photon, the wavelength of the laser are λp, described n-th
The wavelength of idler photon and signal photon is determined by following formula:
6. the method for measurement fibre-optical dispersion according to claim 5, which is characterized in that further include:
The power of continuous wave laser transmitting laser is amplified；
Fall the sideband noise of the laser after the power amplification by band-pass filter, and will filter out swashing for sideband noise
Light output, it is described to filter out sideband noise for generating the laser of the time energy entangled photon pairs of the nondegenerate of wide range to be described
Laser.
7. the method for measurement fibre-optical dispersion according to claim 6, which is characterized in that further include:
The polarization state of the laser of the bandpass filter output is adjusted, to obtain between the laser and silicon nanowires waveguide
Optimistic coupling efficiency, the silicon nanowires waveguide under laser pump (ing) for generating spontaneous four-wave mixing nonlinear effect.
8. the method for measurement fibre-optical dispersion according to claim 5, which is characterized in that the corresponding wavelength zone in the band logical area
Between do not include the laser wavelength.
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| CN100426117C (en) * | 2006-06-22 | 2008-10-15 | 天津大学 | Whole-optical fiber narrow-bandwidth single-photon source |
| CN101398590A (en) * | 2008-11-06 | 2009-04-01 | 天津大学 | All-optical frequency entangled photon source |
| CN103034015A (en) * | 2012-12-28 | 2013-04-10 | 清华大学 | Polarization entanglement two-photon generating system |
| CN103901700A (en) * | 2014-05-06 | 2014-07-02 | 天津大学 | Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method |
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| CN100426117C (en) * | 2006-06-22 | 2008-10-15 | 天津大学 | Whole-optical fiber narrow-bandwidth single-photon source |
| CN101398590A (en) * | 2008-11-06 | 2009-04-01 | 天津大学 | All-optical frequency entangled photon source |
| CN103034015A (en) * | 2012-12-28 | 2013-04-10 | 清华大学 | Polarization entanglement two-photon generating system |
| CN103901700A (en) * | 2014-05-06 | 2014-07-02 | 天津大学 | Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method |
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