CN109193323A - Lock the device and method of optical communicating waveband twin-laser frequency - Google Patents
Lock the device and method of optical communicating waveband twin-laser frequency Download PDFInfo
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- CN109193323A CN109193323A CN201811362924.0A CN201811362924A CN109193323A CN 109193323 A CN109193323 A CN 109193323A CN 201811362924 A CN201811362924 A CN 201811362924A CN 109193323 A CN109193323 A CN 109193323A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
- H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06712—Polarising fibre; Polariser
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
- H01S3/1024—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping for pulse generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a kind of apparatus and method for locking optical communicating waveband twin-laser frequency simultaneously.Phase-modulation is carried out to laser signal and generates single photon sideband signals, the error signal of corresponding single modulating frequency is extracted by independently demodulating discrete digital pulse signal using palarization multiplexing combination single photon multi-wavelength modulation, error signal is loaded into the voltage tuning port of corresponding voltage controlled oscillator, by changing output radio frequency signal frequency to tune single photon sideband frequency, realize real-time lock twin-laser frequency to a polarization-maintaining fiber grating fast axle transmission peaks and slow axis transmission peaks, while obtain two beam high frequency stability laser output.When the present invention solves laser frequency and detuning larger reference frequency or laser is when being unable to frequency tuning, can not locked laser frequency the problem of.Structure of the invention is compact, easy to operate, and stability is high, and system cost is low and work efficiency is high, can be applied to accurate measurement, quantum communications, the fields such as high-resolution spectra.
Description
Technical field
The invention belongs to laser technology field, device that is specifically a kind of while locking optical communicating waveband twin-laser frequency
And method, multi-wavelength modulation is carried out to single photon and independently demodulates discrete digital pulse signal extracting corresponding error letter
Number, the method that two lasers are locked to a polarization-maintaining fiber grating simultaneously by tuning corresponding single photon sideband frequency.
Background technique
High frequency stability laser is widely used in the fields such as accurate measurement, quantum communications, high-resolution spectra.Work as laser
When close with the frequency of frequency reference, feedback signal is loaded into the frequency modulation(PFM) port of laser using degeneration factor, it will
Laser, which is locked to frequency reference, can be improved the frequency stability of laser, and this laser system applies valence with important
Value.Two even multi-station lasers are locked to frequency reference simultaneously by direct turning laser frequency by people, obtain high frequency
The stable laser output of rate.But when laser frequency and reference frequency are detuning larger or when laser frequency cannot tune,
Laser frequency can not be then locked, the application of laser is limited.Using acousto-optic modulator, by tuning, its driving voltage is mobile to swash
Light frequency, so that laser and frequency reference is resonated finally realizes laser frequency lock, but the modulation bandwidth of acousto-optic modulator is non-
It is often limited, it cannot flexibly use in an experiment.
Summary of the invention
The present invention provides a kind of dress for locking optical communicating waveband twin-laser frequency to solve the existing above problem
It sets and method can not lock when solving laser frequency and detuning larger reference frequency or when laser is unable to frequency tuning
The problem of laser frequency.
The present invention is achieved by the following technical scheme:
A kind of device locking optical communicating waveband twin-laser frequency, including first laser system and second laser system.
The first laser system includes first laser device, what the first laser device output was transmitted along polarization maintaining optical fibre slow axis
Single-frequency linearly polarized laser successively passes through the first polarization preserving fiber isolator of polarization maintaining optical fibre connection, the first polarization maintaining optical fibre attenuator, the
Enter the first input end of polarization maintaining optical fibre polarization beam combiner after one polarization maintaining optical fibre electrooptic modulator.
The second laser system includes second laser, what the second laser output was transmitted along polarization maintaining optical fibre slow axis
Single-frequency linearly polarized laser successively passes through the second polarization preserving fiber isolator of polarization maintaining optical fibre connection, the second polarization maintaining optical fibre attenuator, the
Enter the second input terminal of the polarization maintaining optical fibre polarization beam combiner after two polarization maintaining optical fibre electrooptic modulators.
The output end of the polarization maintaining optical fibre polarization beam combiner is connected by polarization maintaining optical fibre with the input terminal of polarization-maintaining fiber grating,
The output end of the polarization-maintaining fiber grating is connected by polarization maintaining optical fibre with the input terminal of polarization-maintaining fiber coupler, the polarization maintaining optical fibre
First output end of coupler is connected by polarization maintaining optical fibre with the input terminal of single-photon detector, the polarization-maintaining fiber coupler
The polarized orthogonal laser that second output terminal exports two beam Frequency Lockings is used for experimental study.
First output end of the single-photon detector is connected with the input terminal of the first lock-in amplifier, first locking phase
First output end of amplifier is connected with the input terminal of the first simulation proportional plus integral plus derivative controller, first lock-in amplifier
Second output terminal be connected with the first input end of oscillograph, the modulation output end and the first addition of first lock-in amplifier
The first input end of device is connected, and the second input terminal of the first adder is connected with the output end of the first radio frequency source, and described the
The output end of one adder is connected with the first input end of second adder, the first simulation proportional plus integral plus derivative controller
Output end is connected with the second input terminal of second adder, and the output end of the second adder is defeated with the first voltage controlled oscillator
Enter end to be connected, the modulation input terminal phase of the output end of first voltage controlled oscillator and the first polarization maintaining optical fibre electrooptic modulator
Even.
The second output terminal of the single-photon detector is connected with the input terminal of the second lock-in amplifier, second locking phase
First output end of amplifier is connected with the input terminal of the second simulation proportional plus integral plus derivative controller, second lock-in amplifier
Second output terminal be connected with the second input terminal of oscillograph, the modulation output end of second lock-in amplifier and third addition
The first input end of device is connected, and the second input terminal of the third adder is connected with the output end of the second radio frequency source, and described the
The output end of three adders is connected with the first input end of the 4th adder, the second simulation proportional plus integral plus derivative controller
Output end is connected with the second input terminal of the 4th adder, and the output end of the 4th adder is defeated with the second voltage controlled oscillator
Enter end to be connected, the modulation input terminal phase of the output end of second voltage controlled oscillator and the second polarization maintaining optical fibre electrooptic modulator
Even.
The method for carrying out locking optical communicating waveband twin-laser frequency using above system, includes the following steps:
First laser device output enters the first polarization maintaining optical fibre along the 1549.64nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits
Isolator, the effect of the first polarization preserving fiber isolator are to prevent from laser to be reflected into first laser device to influence job stability.
Laser by the output of the first polarization preserving fiber isolator by the first polarization maintaining optical fibre attenuator adjusting strength to single photon magnitude, it
Single photon signal, which enters after the first polarization maintaining optical fibre electrooptic modulator carries out phase-modulation, afterwards generates single order sideband, and then single photon is believed
Number enter polarization maintaining optical fibre polarization beam combiner first input end, be output and then enter polarization maintaining optical fibre by polarization maintaining optical fibre polarization beam combiner
Grating transmission.
Second laser output enters the second polarization-maintaining along the 1549.97nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits
Fibre optic isolater, the effect of the second polarization preserving fiber isolator are to prevent from laser to be reflected into second laser to influence the operation is stable
Property.Laser by the output of the second polarization preserving fiber isolator is by the second polarization maintaining optical fibre attenuator adjusting strength to single photon amount
Grade, single photon signal, which enters after the second polarization maintaining optical fibre electrooptic modulator carries out phase-modulation, later generates single order sideband, then single
Photon signal enters the second input terminal of polarization maintaining optical fibre polarization beam combiner, also enters after the output of polarization maintaining optical fibre polarization beam combiner
Polarization-maintaining fiber grating transmission.
First radio frequency source exports oblique wave scanning signal and the high-frequency modulation signal of the first lock-in amplifier output passes through first
Adder is superimposed, and the voltage tuning port of the first voltage controlled oscillator is input to after second adder, wherein oblique wave
Signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for the frequency of modulation sideband, signal.Due to the first voltage-controlled vibration
The output signal frequency and input voltage for swinging device have linear response, and the sine wave signal of the first voltage controlled oscillator output modulation adds
It is downloaded to the modulation port of the first polarization maintaining optical fibre electrooptic modulator, then inputs single photon signal and generates left and right one after phase-modulation
Rank sideband selects suitable sideband frequency, and the fast axle frequencies of transmission of polarization-maintaining fiber grating is believed with one of sideband
Number resonance.Single photon signal by polarization-maintaining fiber grating transmission output enters polarization-maintaining fiber coupler, polarization-maintaining fiber coupler
First output end output signal is acquired by single-photon detector, and exports the digital pulse signal of respective intensities.
Second radio frequency source output oblique wave scanning signal and the high-frequency modulation signal of the second lock-in amplifier output pass through third
Adder is superimposed, and the voltage tuning port of the second voltage controlled oscillator is input to after the 4th adder, wherein oblique wave
Signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for the frequency of modulation sideband, signal.Due to the second voltage-controlled vibration
The output signal frequency and input voltage for swinging device have linear response, and the sine wave signal of the second voltage controlled oscillator output modulation adds
It is downloaded to the modulation port of the second polarization maintaining optical fibre electrooptic modulator, then inputs single photon signal and generates left and right one after phase-modulation
Rank sideband selects suitable sideband frequency, and the slow axis frequencies of transmission of polarization-maintaining fiber grating is believed with one of sideband
Number resonance.Single photon signal by polarization-maintaining fiber grating transmission output enters polarization-maintaining fiber coupler, polarization-maintaining fiber coupler
First output end output signal is acquired by single-photon detector, and exports the digital pulse signal of respective intensities.
The first via digit pulse of single-photon detector output enters the first lock-in amplifier and is demodulated, and the first locking phase is put
Big device only demodulates modulated signal corresponding with the first lock-in amplifier modulating frequency, filters out the noise signal of other frequency ranges.First
Lock-in amplifier exports corresponding error signal and optimizes into the first simulation proportional plus integral plus derivative controller, while in oscillography
Monitoring is synchronized on device.The error signal of first simulation proportional plus integral plus derivative controller output optimization is after second adder
It is loaded into the voltage tuning port of the first voltage controlled oscillator.The oblique wave scanning signal of the first radio frequency source output is closed, selection is suitable
Direct current biasing, make the fast axle frequencies of transmission complete resonance of corresponding sideband signals and polarization-maintaining fiber grating, pass through optimization experiment ginseng
Number keeps the error signal amplitudes observed on oscillograph minimum, then realizes the frequency of locking first laser device to polarization maintaining optical fibre light
The fast axle transmission peaks of grid.
Second number word pulse of single-photon detector output enters the second lock-in amplifier and is demodulated, and the second locking phase is put
Big device only demodulates modulated signal corresponding with the second lock-in amplifier modulating frequency, filters out the noise signal of other frequency ranges.Second
Lock-in amplifier exports corresponding error signal and optimizes into the second simulation proportional plus integral plus derivative controller, while in oscillography
Monitoring is synchronized on device.The error signal of second simulation proportional plus integral plus derivative controller output optimization is after the 4th adder
It is loaded into the voltage tuning port of the second voltage controlled oscillator, closes the oblique wave scanning signal of the second radio frequency source output, selection is suitable
Direct current biasing, make the slow axis frequencies of transmission complete resonance of corresponding sideband signals and polarization-maintaining fiber grating, pass through optimization experiment ginseng
Number keeps the error signal amplitudes observed on oscillograph minimum, then realizes the frequency of locking second laser to polarization maintaining optical fibre light
The slow axis transmission peaks of grid.
Palarization multiplexing is that the two mutually perpendicular linearly polarized lights of beam polarization state are same along fast axle and slow axis in a polarization maintaining optical fibre
When the method transmitted, single photon multi-wavelength modulation is to be imitated using multiple modulated signals by the transmission of periodic modulation single photon
Rate makes single photon signal carry different modulation intelligences in time domain distribution, then carries out photoelectric conversion by single-photon detector
Afterwards, output discrete digital pulse signal also carries corresponding modulation intelligence in time domain distribution, and digit pulse enters different locking phases
Amplifier carries out independent demodulation, and lock-in amplifier only demodulates the signal near single modulating frequency in filtering bandwidth, filters out filtering
Other noise signals other than bandwidth can export corresponding error signal for locking corresponding laser frequency.
The present invention generates single photon sideband by carrying out phase-modulation to laser signal, more by palarization multiplexing and single photon
Wavelength modulation, which obtains, corresponds to corresponding error signal at single modulating frequency, and error signal is loaded into corresponding voltage controlled oscillator
Voltage tuning port realize real-time lock by changing output radio frequency signal frequency to tuning single photon sideband frequency
Twin-laser frequency is to the fast axle transmission peaks and slow axis transmission peaks of a polarization-maintaining fiber grating, while it is steady to obtain two beam high-frequencies
Qualitative laser output.
Compared with the prior art, the advantages of the present invention are as follows:
1, there is compact-sized, easy to operate, the features such as stability is high；
2, the frequency of twin-laser is locked simultaneously to a polarization-maintaining fiber grating, and system cost is low and work efficiency is high；
3, laser frequency is locked using electrooptic modulator, since electrooptic modulator has very wide modulation bandwidth, solves laser
When frequency and reference frequency are detuning larger or laser is when being unable to frequency tuning, can not locked laser frequency the problem of.
Detailed description of the invention
Fig. 1 shows the connection schematic diagram of device of the present invention, (dotted line represents the optical signal transmitted along polarization maintaining optical fibre, solid line
Represent the electric signal transmitted along electric wire).
Fig. 2 indicates to export letter after the first polarization maintaining optical fibre electrooptic modulator (or second polarization maintaining optical fibre electrooptic modulator)
Number spectral schematic.
In figure: 1- first laser device, the first polarization preserving fiber isolator of 2-, 3- the first polarization maintaining optical fibre attenuator, 4- first are protected
Polarisation fibre electrooptic modulator, 5- polarization maintaining optical fibre polarization beam combiner, 6- polarization-maintaining fiber grating, 7- polarization-maintaining fiber coupler, 8- monochromatic light
Sub- detector, the first radio frequency source of 9-, 10- first adder, the first lock-in amplifier of 11-, the first voltage controlled oscillator of 12-, 13-
Two adders, 14- first simulate proportional plus integral plus derivative controller, 15- oscillograph, 16- second laser, 17- the second polarization-maintaining light
Fiber isolator, 18- the second polarization maintaining optical fibre attenuator, 19- the second polarization maintaining optical fibre electrooptic modulator, the second radio frequency source of 20-, 21-
Three adders, the second lock-in amplifier of 22-, the second voltage controlled oscillator of 23-, the 4th adder of 24-, 25- second simulate ratio product
Divide derivative controller.
Specific embodiment
Specific embodiments of the present invention are described in detail below.
A kind of device locking optical communicating waveband twin-laser frequency, as shown in Figure 1, including first laser system and second
Laser system.
First laser system includes first laser device 1, and the output of first laser device 1 is transmitted along polarization maintaining optical fibre slow axis
1549.64nm single-frequency linearly polarized laser successively passes through the first polarization preserving fiber isolator 2 of polarization maintaining optical fibre connection, the first polarization maintaining optical fibre
Enter the first input end of polarization maintaining optical fibre polarization beam combiner 5 after attenuator 3, the first polarization maintaining optical fibre electrooptic modulator 4.
Second laser system includes second laser 16, and the output of second laser 16 is transmitted along polarization maintaining optical fibre slow axis
1549.97nm single-frequency linearly polarized laser successively passes through the second polarization preserving fiber isolator 17 of polarization maintaining optical fibre connection, the second polarization-maintaining light
Enter the second input terminal of the polarization maintaining optical fibre polarization beam combiner 5 after fine attenuator 18, the second polarization maintaining optical fibre electrooptic modulator 19.
The polarization-maintaining fiber grating 6 that optical reference is used in experiment is π phase shift polarization-maintaining fiber grating, and slow axis transmission peaks line width is
65MHz, fast axle transmission peaks line width are 67MHz.The processing of vibration isolation temperature control is carried out to improve frequency stability to polarization-maintaining fiber grating 6.
The output end of polarization maintaining optical fibre polarization beam combiner 5 is connected by polarization maintaining optical fibre with the input terminal of polarization-maintaining fiber grating 6, is protected
The output end of inclined fiber grating 6 is connected by polarization maintaining optical fibre with the input terminal of polarization-maintaining fiber coupler 7, polarization-maintaining fiber coupler 7
First output end of (splitting ratio 50:50) is connected by polarization maintaining optical fibre with the input terminal of single-photon detector 8, polarization maintaining optical fibre coupling
The second output terminal output of device 7 polarizes Frequency Locking laser along two bunch that polarization maintaining optical fibre fast axle and slow axis are transmitted, and can be used to
Experimental study.
First output end of single-photon detector 8 is connected with the input terminal of the first lock-in amplifier 11, the amplification of the first locking phase
First output end of device 11 is connected with the input terminal of the first simulation proportional plus integral plus derivative controller 14, the first lock-in amplifier 11
Second output terminal is connected with the first input end of oscillograph 15, the modulation output end and first adder of the first lock-in amplifier 11
10 first input end is connected, and the output end of the first radio frequency source 9 is connected with the second input terminal of first adder 10, the first addition
The output end of device 10 is connected with the first input end of second adder 13, the output of the first simulation proportional plus integral plus derivative controller 14
End is connected with the second input terminal of second adder 13, the input of the output end of second adder 13 and the first voltage controlled oscillator 12
End is connected, and the output end of the first voltage controlled oscillator 12 is connected with the modulation input terminal of the first polarization maintaining optical fibre electrooptic modulator 4.
The second output terminal of single-photon detector 8 is connected with the input terminal of the second lock-in amplifier 22, the amplification of the second locking phase
First output end of device 22 is connected with the input terminal of the second simulation proportional plus integral plus derivative controller 25, the second lock-in amplifier 22
Second output terminal is connected with the second input terminal of oscillograph 15, the modulation output end and third adder of the second lock-in amplifier 22
21 first input end is connected, and the output end of the second radio frequency source 20 is connected with the second input terminal of third adder 21, and third adds
The output end of musical instruments used in a Buddhist or Taoist mass 21 is connected with the first input end of the 4th adder 24, and second simulates the defeated of proportional plus integral plus derivative controller 25
Outlet is connected with the second input terminal of the 4th adder 24, and the output end of the 4th adder 24 is defeated with the second voltage controlled oscillator 23
Enter end to be connected, the output end of the second voltage controlled oscillator 23 is connected with the modulation input terminal of the second polarization maintaining optical fibre electrooptic modulator 19.
The method that above-mentioned apparatus carries out locking optical communicating waveband twin-laser frequency, includes the following steps: first laser device 1
It exports and enters the first polarization preserving fiber isolator 2 along the 1549.64nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits, first protects
The effect of polarisation fiber isolator 2 is to prevent from laser to be reflected into first laser device 1 to influence job stability.By the first polarization-maintaining
The laser that fibre optic isolater 2 exports is by 3 adjusting strength of the first polarization maintaining optical fibre attenuator to single photon magnitude, and average photon number is about
It is 0.1.Later single photon signal enter the first polarization maintaining optical fibre electrooptic modulator 4 carry out phase-modulation, then single photon signal into
The first input end for entering polarization maintaining optical fibre polarization beam combiner 5 is output and then enter polarization maintaining optical fibre light by polarization maintaining optical fibre polarization beam combiner 5
Grid 6 transmit.
The output of second laser 16 enters second along the 1549.97nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits and protects
Polarisation fiber isolator 17, the effect of the second polarization preserving fiber isolator 17 are that laser is prevented to be reflected into the influence of second laser 16
Job stability.Laser by the output of the second polarization preserving fiber isolator 17 passes through 18 adjusting strength of the second polarization maintaining optical fibre attenuator
To single photon magnitude, average photon number is about 0.1.Single photon signal is carried out into the second polarization maintaining optical fibre electrooptic modulator 19 later
Phase-modulation, then single photon signal enters the second input terminal of polarization maintaining optical fibre polarization beam combiner 5, polarizes and closes by polarization maintaining optical fibre
Beam device 5, which also enters polarization-maintaining fiber grating 6 after exporting, to be transmitted.
First radio frequency source 9 exports 8Hz oblique wave scanning signal and the first lock-in amplifier 11 output 8.9kHz high frequency modulated letter
It number is superimposed by first adder 10, the voltage tune of the first voltage controlled oscillator 12 is input to after second adder 13
Humorous port, wherein ramp signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for the frequency of modulation sideband, signal.
Due to the first voltage controlled oscillator 12 output signal frequency and input voltage have about 86MHz/V linear response relationship, first
The sine wave signal of the output modulation of voltage controlled oscillator 12 is loaded into the modulation port of the first polarization maintaining optical fibre electrooptic modulator 4, and first
The modulation bandwidth of polarization maintaining optical fibre electrooptic modulator 4 is 20GHz, then inputs single photon signal and generate left and right one after phase-modulation
Rank sideband, corresponding spectral schematic are as shown in Figure 2.Suitable sideband frequency is selected, so that the fast axle of polarization-maintaining fiber grating 6 is saturating
Radio frequency rate can resonate with the right band signal.Single photon signal by the transmission output of polarization-maintaining fiber grating 6 enters polarization maintaining optical fibre
Coupler 7,7 first output end output signal of polarization-maintaining fiber coupler is acquired by single-photon detector 8, and exports respective intensities
Digital pulse signal, for the distribution probability of digital pulse signal by 8.9kHz sine wave modulation, i.e. digit pulse carries 8.9kHz tune
Information processed.
Second radio frequency source 20 exports 10Hz oblique wave scanning signal and the 8.2kHz of the second lock-in amplifier 22 output modulates letter
It number is superimposed by third adder 21, the voltage tune of the second voltage controlled oscillator 23 is input to after the 4th adder 24
Humorous port, wherein ramp signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for the frequency of modulation sideband, signal.
Due to the second voltage controlled oscillator 23 output signal frequency and input voltage have about 85MHz/V linear response relationship, second
The sine wave signal of the output modulation of voltage controlled oscillator 23 is loaded into the modulation port of the second polarization maintaining optical fibre electrooptic modulator 19, and second
The modulation bandwidth of polarization maintaining optical fibre electrooptic modulator 19 is 20GHz, then inputs single photon signal and generate left and right after phase-modulation
Single order sideband, corresponding spectral schematic are as shown in Figure 2.Suitable sideband frequency is selected, so that the slow axis of polarization-maintaining fiber grating 6
Frequencies of transmission can resonate with the right band signal.Single photon signal by the transmission output of polarization-maintaining fiber grating 6 enters polarization-maintaining light
Fine coupler 7,7 first output end output signal of polarization-maintaining fiber coupler is acquired by single-photon detector 8, and exports respective intensities
Digital pulse signal, the distribution probability of digital pulse signal carries 8.2kHz by 8.2kHz sine wave modulation, i.e. digit pulse
Modulation intelligence.
The first via digit pulse that single-photon detector 8 exports enters the first lock-in amplifier 11 and is demodulated, the first lock
The time of integration of phase amplifier 11 is 1ms, and filter slope 24dB, corresponding filtering bandwidth is 78.1Hz.The amplification of first locking phase
Corresponding modulated signal at 11 demodulation positions 8.9kHz of device, has filtered out the noise signal at 8.2kHz, the first lock-in amplifier
The corresponding error signal of 11 outputs enters the first simulation proportional plus integral plus derivative controller 14 and optimizes, while on oscillograph 15
Synchronize monitoring.The error signal of the first simulation output optimization of proportional plus integral plus derivative controller 14 is after second adder 13
It is loaded into the voltage tuning port of the first voltage controlled oscillator 12, closes the oblique wave scanning signal of the first radio frequency source 9 output, selection is closed
Suitable direct current biasing makes the fast axle frequencies of transmission complete resonance of the right band signal and polarization-maintaining fiber grating 6, passes through optimization experiment ginseng
Number keeps the error signal amplitude observed on oscillograph 15 minimum, and corresponding laser frequency, which rises and falls, is less than 3.5MHz, then realizes
The frequency of first laser device 1 is locked to the fast axle transmission peaks of polarization-maintaining fiber grating 6.
The second number word pulse that single-photon detector 8 exports enters the second lock-in amplifier 22 and is demodulated, the second lock
The time of integration of phase amplifier 22 is 1ms, and filter slope 18dB, corresponding filtering bandwidth is 93.75Hz.The amplification of second locking phase
Corresponding modulated signal at 22 demodulation 8.2kHz modulating frequencies of device filters out the noise signal at 8.9kHz, the amplification of the second locking phase
Device 22 exports corresponding error signal and optimizes into the second simulation proportional plus integral plus derivative controller 25, while in oscillograph 15
On synchronize monitoring.The error signal of the second simulation output optimization of proportional plus integral plus derivative controller 25 passes through the 4th adder 24
It is loaded into the voltage tuning port of the second voltage controlled oscillator 23 afterwards, closes the oblique wave scanning signal of the second radio frequency source 20 output, choosing
Suitable direct current biasing is selected, the slow axis frequencies of transmission complete resonance of the right band signal and polarization-maintaining fiber grating 6 is made, it is real by optimization
Testing parameter keeps the error signal amplitude observed on oscillograph 15 minimum, and corresponding laser frequency, which rises and falls, is less than 3.9MHz, then real
The frequency of locking second laser 16 is showed to the slow axis transmission peaks of polarization-maintaining fiber grating 6.
The present invention, which is used, carries out phase-modulation generation single photon sideband signals to laser signal, utilizes palarization multiplexing to combine single
Photon multi-wavelength modulation, which passes through, independently demodulates the error letter that discrete digital pulse signal extracts corresponding single modulating frequency
Number, error signal is loaded into the voltage tuning port of corresponding voltage controlled oscillator, by change output radio frequency signal frequency to
Tune single photon sideband frequency, realize real-time lock twin-laser frequency to a polarization-maintaining fiber grating fast axle transmission peaks with
Slow axis transmission peaks, while obtaining the output of two beam high frequency stability laser.The present invention has rational design, compact-sized, operation side
Just, stability is high, and system cost is low and work efficiency is high, can be applied to the neck such as accurate measurement, quantum communications, high-resolution spectra
Domain.
It should be pointed out that for the those skilled in the art of the art, without departing from the principle of the present invention,
Several improvement and application can also be made, these are improved and application is also considered as protection scope of the present invention.
Claims (3)
1. a kind of device for locking optical communicating waveband twin-laser frequency, it is characterised in that: including first laser system and second
Laser system；
The first laser system includes first laser device (1), and first laser device (1) output is transmitted along polarization maintaining optical fibre slow axis
Single-frequency linearly polarized laser successively pass through polarization maintaining optical fibre connection the first polarization preserving fiber isolator (2), the first polarization maintaining optical fibre decaying
Device (3), the first polarization maintaining optical fibre electrooptic modulator (4) enter the first input end of polarization maintaining optical fibre polarization beam combiner (5) afterwards；
The second laser system includes second laser (16), and second laser (16) output is passed along polarization maintaining optical fibre slow axis
Defeated single-frequency linearly polarized laser successively passes through the second polarization preserving fiber isolator (17) of polarization maintaining optical fibre connection, the second polarization maintaining optical fibre declines
Subtract the second input terminal that device (18), the second polarization maintaining optical fibre electrooptic modulator (19) enter polarization maintaining optical fibre polarization beam combiner (5) afterwards；
The output end of the polarization maintaining optical fibre polarization beam combiner (5) passes through the input terminal phase of polarization maintaining optical fibre and polarization-maintaining fiber grating (6)
Even, the output end of the polarization-maintaining fiber grating (6) is connected by polarization maintaining optical fibre with the input terminal of polarization-maintaining fiber coupler (7), institute
The first output end for stating polarization-maintaining fiber coupler (7) is connected by polarization maintaining optical fibre with the input terminal of single-photon detector (8)；
First output end of the single-photon detector (8) is connected with the input terminal of the first lock-in amplifier (11), and described first
First output end of lock-in amplifier (11) is connected with the input terminal of the first simulation proportional plus integral plus derivative controller (14), and described the
The second output terminal of one lock-in amplifier (11) is connected with the first input end of oscillograph (15), first lock-in amplifier
(11) modulation output end is connected with the first input end of first adder (10), the second input of the first adder (10)
End is connected with the output end of the first radio frequency source (9), and the of the output end of the first adder (10) and second adder (13)
One input terminal is connected, and described first simulates the second of the output end of proportional plus integral plus derivative controller (14) and second adder (13)
Input terminal is connected, and the output end of the second adder (13) is connected with the input terminal of the first voltage controlled oscillator (12), and described the
The output end of one voltage controlled oscillator (12) is connected with the modulation input terminal of the first polarization maintaining optical fibre electrooptic modulator (4)；
The second output terminal of the single-photon detector (8) is connected with the input terminal of the second lock-in amplifier (22), and described second
First output end of lock-in amplifier (22) is connected with the input terminal of the second simulation proportional plus integral plus derivative controller (25), and described the
The second output terminal of two lock-in amplifiers (22) is connected with the second input terminal of oscillograph (15), second lock-in amplifier
(22) modulation output end is connected with the first input end of third adder (21), the second input of the third adder (21)
End is connected with the output end of the second radio frequency source (20), and the of the output end of the third adder (21) and the 4th adder (24)
One input terminal is connected, and described second simulates the second of the output end of proportional plus integral plus derivative controller (25) and the 4th adder (24)
Input terminal is connected, and the output end of the 4th adder (24) is connected with the input terminal of the second voltage controlled oscillator (23), and described the
The output end of two voltage controlled oscillators (23) is connected with the modulation input terminal of the second polarization maintaining optical fibre electrooptic modulator (19).
2. the device of locking optical communicating waveband twin-laser frequency according to claim 1, it is characterised in that: the polarization-maintaining
Fiber grating (6) is π phase shift polarization-maintaining fiber grating, and slow axis transmission peaks line width is 65MHz, and fast axle transmission peaks line width is 67MHz.
3. a kind of method for locking optical communicating waveband twin-laser frequency, characterized by the following steps: first laser device
(1) it exports and enters the first polarization preserving fiber isolator (2) along the 1549.64nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits,
Laser by the first polarization preserving fiber isolator (2) output is by the first polarization maintaining optical fibre attenuator (3) adjusting strength to single photon
Magnitude, later single photon signal enter the first polarization maintaining optical fibre electrooptic modulator (4) carry out phase-modulation, then single photon signal into
The first input end for entering polarization maintaining optical fibre polarization beam combiner (5) is output and then enter polarization-maintaining light by polarization maintaining optical fibre polarization beam combiner (5)
Fine grating (6) transmission；
Second laser (16) output enters the second polarization-maintaining along the 1549.97nm single-frequency linearly polarized laser that polarization maintaining optical fibre slow axis transmits
Fibre optic isolater (17), the laser by the second polarization preserving fiber isolator (17) output pass through the second polarization maintaining optical fibre attenuator (18)
Adjusting strength is to single photon magnitude, and single photon signal enters the second polarization maintaining optical fibre electrooptic modulator (19) progress phase tune later
System, then single photon signal enters the second input terminal of polarization maintaining optical fibre polarization beam combiner (5), by polarization maintaining optical fibre polarization beam combiner
(5) also enter polarization-maintaining fiber grating (6) after exporting to transmit；
First radio frequency source (9) exports 8Hz oblique wave scanning signal and the first lock-in amplifier (11) output 8.9kHz high frequency modulated letter
It number is superimposed by first adder (10), the first voltage controlled oscillator (12) is input to after second adder (13)
Voltage tuning port, wherein ramp signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for modulation sideband, signal
Frequency；The sine wave signal of first voltage controlled oscillator (12) output modulation is loaded into the first polarization maintaining optical fibre electrooptic modulator (4)
Modulation port, the modulation bandwidth of the first polarization maintaining optical fibre electrooptic modulator (4) is 20GHz, then inputs single photon signal by phase
Left and right single order sideband is generated after the modulation of position, suitable sideband frequency is selected, so that the fast axle frequencies of transmission of polarization-maintaining fiber grating (6)
It can resonate with the right band signal；Single photon signal by polarization-maintaining fiber grating (6) transmission output enters polarization maintaining optical fibre coupling
Device (7), (7) first output end output signal of polarization-maintaining fiber coupler is acquired by single-photon detector (8), and exports respective intensities
Digital pulse signal, the distribution probability of digital pulse signal carries 8.9kHz by 8.9kHz sine wave modulation, i.e. digit pulse
Modulation intelligence；
Second radio frequency source (20) exports 10Hz oblique wave scanning signal and the 8.2kHz of the second lock-in amplifier (22) output modulates letter
It number is superimposed by third adder (21), is input to the second voltage controlled oscillator (23) after the 4th adder (24)
Voltage tuning port, wherein ramp signal is used to scan the frequency of sideband signals, and high-frequency modulation signal is used for modulation sideband, signal
Frequency；The sine wave signal of second voltage controlled oscillator (23) output modulation is loaded into the second polarization maintaining optical fibre electrooptic modulator (19)
Modulation port, the modulation bandwidth of the second polarization maintaining optical fibre electrooptic modulator (19) is 20GHz, then inputs single photon signal by phase
Left and right single order sideband is generated after the modulation of position, suitable sideband frequency is selected, so that the slow axis frequencies of transmission of polarization-maintaining fiber grating (6)
It can resonate with the right band signal；Single photon signal by polarization-maintaining fiber grating (6) transmission output enters polarization maintaining optical fibre coupling
Device (7), (7) first output end output signal of polarization-maintaining fiber coupler is acquired by single-photon detector (8), and exports respective intensities
Digital pulse signal, the distribution probability of digital pulse signal carries 8.2kHz by 8.2kHz sine wave modulation, i.e. digit pulse
Modulation intelligence；
The first via digit pulse of single-photon detector (8) output enters the first lock-in amplifier (11) and is demodulated, the first lock
The time of integration of phase amplifier (11) is 1ms, and filter slope 24dB, corresponding filtering bandwidth is 78.1Hz；First locking phase is put
Big device (11) only demodulates corresponding modulated signal at the position 8.9kHz, has filtered out the noise signal at 8.2kHz, the first locking phase is put
Big device (11) exports corresponding error signal and optimizes into the first simulation proportional plus integral plus derivative controller (14), while showing
Wave device synchronizes monitoring on (15)；The error signal of first simulation proportional plus integral plus derivative controller (14) output optimization is by the
It is loaded into the voltage tuning port of the first voltage controlled oscillator (12) after two adders (13), closes the first radio frequency source (9) output
Oblique wave scanning signal selects suitable direct current biasing, keeps the fast axle frequencies of transmission of the right band signal and polarization-maintaining fiber grating (6) complete
Full resonance keeps the error signal amplitude observed on oscillograph (15) minimum, and corresponding laser frequency, which rises and falls, is less than 3.5MHz, then
The frequency of locking first laser device (1) is realized to the fast axle transmission peaks of polarization-maintaining fiber grating (6)；
Second number word pulse of single-photon detector (8) output enters the second lock-in amplifier (22) and is demodulated, the second lock
The time of integration of phase amplifier (22) is 1ms, and filter slope 18dB, corresponding filtering bandwidth is 93.75Hz；Second locking phase is put
Big device (22) only demodulates corresponding modulated signal at 8.2kHz modulating frequency, filters out the noise signal at 8.9kHz, the second locking phase
Amplifier (22) exports corresponding error signal and optimizes into the second simulation proportional plus integral plus derivative controller (25), while
Oscillograph synchronizes monitoring on (15)；The error signal of second simulation proportional plus integral plus derivative controller (25) output optimization is passed through
It is loaded into the voltage tuning port of the second voltage controlled oscillator (23) after 4th adder (24), closes the second radio frequency source (20) output
Oblique wave scanning signal, select suitable direct current biasing, make the right band signal and polarization-maintaining fiber grating (6) slow axis frequencies of transmission
Complete resonance keeps the error signal amplitude observed on oscillograph (15) minimum, and corresponding laser frequency, which rises and falls, is less than 3.9MHz,
The frequency of locking second laser (16) is then realized to the slow axis transmission peaks of polarization-maintaining fiber grating (6).
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| CN110146162A (en) * | 2019-06-21 | 2019-08-20 | 忻州师范学院 | The device and method of real-time lock single photon intensity |
| CN110471273A (en) * | 2019-09-17 | 2019-11-19 | 北京大学 | A kind of tracking lock method for automatic closed loop control system |
| CN111327366A (en) * | 2020-04-17 | 2020-06-23 | 忻州师范学院 | System and method for quickly locking minimum bias point of electro-optic intensity modulator |
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| CN114221206A (en) * | 2021-11-29 | 2022-03-22 | 中国人民解放军军事科学院国防科技创新研究院 | Laser frequency stabilization and shift system and laser |
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