CN105737867B - A kind of optical fiber perimeter security protection system signal-to-noise ratio control device and method - Google Patents
A kind of optical fiber perimeter security protection system signal-to-noise ratio control device and method Download PDFInfo
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- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
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Abstract
The present invention provides a kind of optical fiber perimeter security protection system signal-to-noise ratio control device and method, and device includes：Signal generator, signal-balanced device, polarization beat length device, photodetector and signal processing controller, signal generator is connect with signal-balanced device, signal-balanced device is connect with polarization beat length device, polarization beat length device is connect with photodetector, photodetector is connect with signal processing controller, and signal processing controller is connect with signal-balanced device and polarization beat length device.Pass through setting signal balancer, polarization beat length device and signal processing controller, and signal processing controller is connect with signal-balanced device and polarization beat length device, the balance of two ways of optical signals can be adjusted, and the polarization state of adjustment two ways of optical signals, the anti-polarization decay ability of system can be effectively improved, stablize optical output visibility, improve the signal-to-noise ratio of optical fiber perimeter security protection system, improve system accuracy.
Description
Technical field
The present invention relates to security device technical fields, particularly relate to a kind of optical fiber perimeter security protection system signal-to-noise ratio control
Device and method.
Background technology
In recent years, with the development of national economy, the place important to some, such as financial institution, airport, military base
Deng carrying out, safeguard protection is more and more important.According to statistics, the half of the threat suffered by these places is all since safety monitoring is leaked
Caused by hole.To these local safety and protection systems other than not influenced by natural conditions such as weather, landform, energy is also wanted
Enough with the expansion of safety precaution range, the modernization of means of crime is timely adjusted.
The operation for ensureing oil-gas pipeline is an important duty of national departments concerned, but with China's oil-gas pipeline
Circuit increase, the lengthening of pipeline transmission range, the event of pipe leakage happens occasionally.On the one hand the leakage of oil-gas pipeline makes state
Family's property has suffered great loss, on the other hand it is also possible to bringing the secondary disasters such as environmental pollution and fire.It causes
The leakage of oil-gas pipeline is likely to be natural cause, for example pipeline anticorrosion coating is destroyed, and tube wall is in soil electrochemistry corrosiveness
Under there is rust spot, the phenomenon that corrosion gradually runs through entire tube wall.Also when the reasons such as flow error, valve malfunction may make main line
Superpressure causes pipe leakage.In recent years, relative to the natural leak of oil-gas pipeline, the destruction brought to pipeline is artificially stolen more
Seriously, have become the main reason of Oil spills.China is typically to send line attendant along the method that pipeline is patrolled back and forth to protect
The safety of oil transportation is demonstrate,proved, some present criminals are exactly the gap just walked using line attendant's front foot, and the rear foot is begun to greatly
Wantonly drilling hole of oil stolen.Therefore, pipe leakage is found rapidly and accurately judgement leakage point works as business as the steady safe operation of pipeline
It is anxious.
In addition, with the quickening of social informatization paces, communications optical cable increasingly plays an important role, but to so long
The communications optical cable of distance how to effectively protect be always relevant department's headache a problem.Destruction to communications optical cable
It is divided into two kinds：One kind is non-deliberate destruction, and typically some construction units do not pay attention to the light to provided underground in construction
Cable is protected, and with excavator, piling machine etc., some heavy-duty machines are constructed on the ground for be embedded with optical cable, causes the broken of optical cable
It is bad；Another kind be exactly some criminals in order to play one's own game, steal communications optical cable without restraint.For it is above-mentioned be likely to occur to logical
Believe that optical cable destroys situation, it is extremely urgent to the effective protection of communications optical cable.
Whether some important areas or oil-gas pipeline or communications optical cable, they all substantial connection country and
The interests of the people, therefore these places or facility progress security protection are particularly important.There are one common features for they
It is that space length is long, if so by the way of manually going on patrol, the significant wastage of manpower will necessarily be caused.Certainly also someone thinks
Gone out certain methods, such as infrared emission system, also combine network, multimedia technology closed-circuit television system etc., but this
A little methods have some shortcomings, if any cost it is too high, have plenty of and be not suitable for practical application environment etc..
It is external just it is proposed that based on distribution before more than ten years in order to solve the problems, such as long range safety precaution
Using Mach-Zehnder interferometer, intrusion event is carried out using the result to interferometric signal analysis and processing for the scheme of Fibre Optical Sensor
Alarm and positioning.
In practical applications, since Mach-Zehnder optical fiber interferometer has high sensibility to ambient enviroment, it is long away from
From Mach-Zehnder optical fiber sensing in, there are factor --- the polarization decays of limiting sensor application.In the light of long range
Extraneous stress inevitably will make optical fiber that fibre-optical bending and torsion occur in the system of road, this will cause laser polarization in optical fiber
The variation of state, in addition the environmental factors such as optical fiber ambient temperature be unevenly distributed the variation that can also cause polarization state in optical fiber,
So that the signal-to-noise ratio of optical fiber perimeter security protection system is relatively low.
Invention content
The technical problem to be solved in the present invention is to provide a kind of optical fiber perimeter security protection system signal-to-noise ratio control device and
Method can improve the signal-to-noise ratio of optical fiber perimeter security protection system.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of optical fiber perimeter security protection system signal-to-noise ratio control
Device processed, the optical fiber perimeter security protection system signal-to-noise ratio control device include：Signal generator, signal-balanced device, polarization
State controller, photodetector and signal processing controller, the signal generator are connect with the signal-balanced device, the letter
Number balancer is connect with the polarization beat length device, and the polarization beat length device is connect with the photodetector, the photoelectricity
Detector is connect with the signal processing controller, the signal processing controller and the signal-balanced device and polarization beat length
Device connects；
Signal generator, for generating two ways of optical signals clockwise and anticlockwise；
Signal-balanced device, for the control according to signal processing controller to the two ways of optical signals balancing；
Polarization beat length device carries out the two ways of optical signals after balancing for the control according to signal processing controller inclined
Polarization state adjusts；
Photodetector, for receiving the two ways of optical signals after polarization state adjustment, and the two-way light after polarization state is adjusted
Signal is converted to two path signal and is sent to signal processing controller；
Signal processing controller, for receiving the two path signal of photodetector transmission, according to the two path signal
Signal-balanced device is controlled to the two ways of optical signals balancing, after controlling polarization beat length device to balancing according to the electric signal
Two ways of optical signals carry out polarization state adjustment.
Preferably, the signal-balanced device includes the first signal-balanced device and second signal balancer, the polarization state control
Device processed include the first polarization beat length device and the second polarization beat length device, the photodetector include the first photodetector and
Second photodetector, the first signal-balanced device are connect with the first polarization beat length device, the first polarization beat length device
It is connect with the first photodetector, the second signal balancer is connect with the second polarization beat length device, second polarization state
Controller is connect with the second photodetector.Preferably, the signal processing controller includes：
Control unit is balanced, for receiving the two path signal that the first photodetector and the second photodetector are sent,
Whether the peak-to-peak value difference for judging the two path signal is more than pre-set difference threshold；When more than pre-set difference
During threshold value, signal-balanced device is controlled to increase the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal
In the range of pre-set difference threshold；
Fringe contrast control unit, for calculating the fringe contrast for the electric signal that the first photodetector is sent, when
When fringe contrast is more than pre-set contrast threshold, new polarization beat length is searched for using variable step simulated annealing
Voltage controls first electrode instrument, and the new polarization state makes the striped pair of electric signal that the first photodetector is sent
Than degree in the range of pre-set contrast threshold；
Signal degree of correlation control unit, for calculating the signal degree of correlation of the two path signal, when the signal degree of correlation surpasses
When crossing pre-set relevance threshold, second is applied to using variable step simulated annealing change each position vector is corresponding
Voltage value on electric polarization instrument is carried out continuous control to the polarization state of second electrode instrument incident light and is carried out using feedback signal
Optimal value is searched for, until the signal degree of correlation of the two path signal is in the range of pre-set relevance threshold.
Preferably, the signal-balanced device is adjustable optical attenuator, under balance control unit control, adjusting light path
Attenuation degree, adjustment two ways of optical signals balance.
Preferably, the adjustable optical attenuator is gathered around there are two voltage input end, by adjusting two voltage differential output controls
The attenuation degree of luminous power.
Preferably, the polarization beat length device is electric polarization instrument, for related to signal in fringe contrast control unit
It spends under control unit control, fringe contrast control is carried out to the optical signal after balancing and the signal degree of correlation controls.
Preferably, the electric polarization instrument is gathered around there are four the direction of extrusion staggered squeezer at 45 °, and control process passes through
Apply voltage to four squeezers to be modulated the polarization state for inputting light wave, export the light wave of different polarization states.
Preferably, the signal generator includes：Narrow linewidth laser, the first coupler, isolator, the first Y waveguide and
Second Y waveguide, the narrow linewidth laser are connect with first coupler, and first coupler is connect with isolator, institute
It states isolator to connect with the first Y waveguide and the second Y waveguide, first Y waveguide is connect with the described first signal-balanced device, described
Second Y waveguide is connect with the second signal balancer.
The present invention also provides a kind of optical fiber perimeter security protection system signal-to-noise ratio control method, the method includes：
Signal generator generates two ways of optical signals clockwise and anticlockwise；
Two ways of optical signals is transmitted to photodetector by signal-balanced device and polarization beat length device；
The two ways of optical signals received is converted to two path signal, and the two path signal is sent by photodetector
To signal processing controller；
The signal processing controller receives the two path signal that photodetector is sent, according to the two path signal control
Signal-balanced device is made to the two ways of optical signals balancing, after controlling polarization beat length device to balancing according to the electric signal
Two ways of optical signals carries out polarization state adjustment；
Signal-balanced device is according to the control of signal processing controller to the two ways of optical signals balancing；
Polarization beat length device carries out polarization state according to the control of signal processing controller to the two ways of optical signals after balancing
Adjustment.
Preferably, the signal processing controller receives the two path signal that photodetector is sent, according to the two-way
Electric signal controls signal-balanced device polarization beat length device to be controlled to exchange according to the electric signal two ways of optical signals balancing
Two ways of optical signals after balance carries out polarization state adjustment, including：
The two path signal that the first photodetector and the second photodetector are sent is received, judges the two path signal
Peak-to-peak value difference whether be more than pre-set difference threshold；When more than pre-set difference threshold, control signal is put down
Weighing apparatus increases the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal is in pre-set difference threshold
In the range of value；
The fringe contrast of the electric signal of the first photodetector transmission is calculated, when fringe contrast is more than pre-set
During contrast threshold, search for new polarization beat length voltage using variable step simulated annealing and first electrode instrument is controlled
System, the new polarization state make the fringe contrast of electric signal that the first photodetector is sent in pre-set contrast threshold
In the range of value；
The signal degree of correlation of the two path signal is calculated, when the signal degree of correlation is more than pre-set relevance threshold
When, change the corresponding voltage value being applied on second electrode instrument of each position vector using variable step simulated annealing, it is right
The polarization state of second electrode instrument incident light carries out continuous control and carries out optimal value search using feedback signal, until described two
The signal degree of correlation of road electric signal is in the range of pre-set relevance threshold.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In said program, by setting signal balancer, polarization beat length device and signal processing controller, and will be at signal
Reason controller is connect with signal-balanced device and polarization beat length device, can adjust the balance of two ways of optical signals and adjustment two-way
The polarization state of optical signal can effectively improve the anti-polarization decay ability of system, stablize optical output visibility, improve optical fiber perimeter
The signal-to-noise ratio of security protection system improves system accuracy.
Description of the drawings
Fig. 1 is the optical fiber perimeter security protection system signal-to-noise ratio control device structure connection block diagram of the embodiment of the present invention；
Fig. 2 is the optical fiber perimeter security protection system signal-to-noise ratio control device signal processing controller knot of the embodiment of the present invention
Structure connects block diagram；
Fig. 3 is the optical fiber perimeter security protection system signal-to-noise ratio control device structure connection block diagram of the embodiment of the present invention；
Fig. 4 is the optical fiber perimeter security protection system signal-to-noise ratio control method flow chart of the embodiment of the present invention.
[main element symbol description]
Signal generator 1；
Signal-balanced device 2；
Polarization beat length device 3；
Photodetector 4；
Signal processing controller 5；
Balance control unit 6；
Fringe contrast control unit 7；
Signal degree of correlation control unit 8；
Narrow linewidth laser 9；
First coupler 10；
Isolator 11；
First Y waveguide 12；
Second Y waveguide 13.
Specific embodiment
To make the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
As shown in Figure 1, a kind of optical fiber perimeter security protection system signal-to-noise ratio control device of the embodiment of the present invention, the light
Fine periphery safety protection system signal-to-noise ratio control device includes：Signal generator 1, signal-balanced device 2, polarization beat length device 3, light
Electric explorer 4 and signal processing controller 5, the signal generator 1 is connect with the signal-balanced device 2, described signal-balanced
Device 2 is connect with the polarization beat length device 3, and the polarization beat length device 3 is connect with the photodetector 4, and the photoelectricity is visited
It surveys device 4 to connect with the signal processing controller 5, the signal processing controller 5 and the signal-balanced device 3 and polarization state control
Device 4 processed connects；
Signal generator 1, for generating two ways of optical signals clockwise and anticlockwise；
Signal-balanced device 2, for the control according to signal processing controller to the two ways of optical signals balancing；
Polarization beat length device 3 carries out the two ways of optical signals after balancing for the control according to signal processing controller
Polarization state adjusts；
Photodetector 4, for receiving the two ways of optical signals after polarization state adjustment, and the two-way light after polarization state is adjusted
Signal is converted to two path signal and is sent to signal processing controller；
Signal processing controller 5, for receiving the two path signal of photodetector transmission, according to the two path signal
Signal-balanced device is controlled to the two ways of optical signals balancing, after controlling polarization beat length device to balancing according to the electric signal
Two ways of optical signals carry out polarization state adjustment.Preferably, it is provided between the polarization beat length device and the photodetector
Interfere arm can be attached using optical fiber between device.
Preferably, M-Z interferometers are provided between polarization beat length device 3 and photodetector 4, the M-Z interferometers have
Two couplers are formed, and described two couplers can be used as interferometer input coupler clockwise and interferometer counterclockwise to export
Coupler can also be used as interferometer input coupler counterclockwise and interferometer output coupler clockwise.
Preferably, the signal-balanced device includes the first signal-balanced device and second signal balancer, the polarization state control
Device processed include the first polarization beat length device and the second polarization beat length device, the photodetector include the first photodetector and
Second photodetector, the first signal-balanced device are connect with the first polarization beat length device, the first polarization beat length device
It is connect with the first photodetector, the second signal balancer is connect with the second polarization beat length device, second polarization state
Controller is connect with the second photodetector.
Wherein, it is signal-balanced can to respectively enter first for the two ways of optical signals clockwise and anticlockwise of signal generator generation
To the two ways of optical signals balancing, the two ways of optical signals after balancing can correspond to entrance respectively for device and second signal balancer
First polarization beat length device and the second polarization beat length device carry out polarization state adjustment, and the two ways of optical signals after polarization state adjustment can be with
Corresponding respectively to enter the first photodetector and the second photodetector, the first photodetector and the second photodetector can be with
The optical signal respectively received is converted into electric signal and is sent to signal processing controller.
The optical fiber perimeter security protection system signal-to-noise ratio control device of the embodiment of the present invention, by setting signal balancer,
Polarization beat length device and signal processing controller, and signal processing controller and signal-balanced device and polarization beat length device are connected
It connects, the balance of two ways of optical signals can be adjusted and adjusts the polarization state of two ways of optical signals, the anti-polarization of system can be effectively improved
Fading capability stablizes optical output visibility, improves the signal-to-noise ratio of optical fiber perimeter security protection system, improves system positioning accurate
Degree.
As shown in Figures 2 and 3, the optical fiber perimeter security protection system signal-to-noise ratio control device of the embodiment of the present invention, the letter
Number processing controller can include：
Control unit 6 is balanced, for receiving the two path signal that the first photodetector and the second photodetector are sent,
Whether the peak-to-peak value difference for judging the two path signal is more than pre-set difference threshold；When more than pre-set difference
During threshold value, signal-balanced device is controlled to increase the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal
In the range of pre-set difference threshold；
Wherein, balance control unit can include the first light decay down control subelement and the second light decay down control subelement,
Compare the peak-to-peak value of two path signal, whether the peak-to-peak value difference for judging the two path signal is more than pre-set difference threshold
Value, in peak-to-peak value comparison procedure, can compare the peak-to-peak value of two signals, if the difference of two-way peak-to-peak value is not in threshold range
It is interior, then by after big (assuming that crying signal 1 tunnel) all the way optical attenuation degree increase of peak-to-peak value, compare two paths of signals peak-to-peak value again,
If 1 road peak-to-peak value of signal is still bigger than another way, and the increment gone out greatly is still in the range of pre-set difference threshold,
Then continue to increase 1 road optical attenuation degree of signal, if 1 road peak-to-peak value of signal is smaller than another way signal and difference is not being pre-set
Difference threshold in the range of, then reduce 1 road optical attenuation degree of signal, and the increment reduced is the half of last time increased increment,
Compare two paths of signals peak-to-peak value again later, rule carries out successively, light decay down control, until the peak-to-peak value difference of two path signal
In the range of pre-set difference threshold.Preferably, binary chop algorithm can be utilized to make two-way interference signal peak-to-peak value poor
Value reaches in the range of pre-set difference threshold.
Lacking this step operation in distributed sensing system at present, it is believed that two paths of signals amplitude is equal, but in real system,
Due to the influence of the difference and external environment of the loss of two-way optical device, two-way optical interference signals have differences, this difference will
Lead to the similarity of two paths of signals to reduce, then influence the realization of distribution type fiber-optic periphery safety protection system location algorithm, shadow
Acoustic system positional accuracy, therefore the process of two-way light balancing is necessary, in the present embodiment, balancing can improve two-way letter
Number similitude, and then improve system positional accuracy.It and can be with using the process of adjustable optical attenuator two paths of signals balance
It adjusts two ways of optical signals and is converted to the amplitude after electric signal, at the signal amplitude in real-time ensuring entering signal processing and control element (PCE)
In optimal, signal saturation is avoided, because if any interference signal all the way causes photodetector saturation, positioning will be seriously affected
Accuracy.
Fringe contrast control unit 7, for calculating the fringe contrast for the electric signal that the first photodetector is sent, when
When fringe contrast is more than pre-set contrast threshold, new polarization beat length is searched for using variable step simulated annealing
Voltage controls first electrode instrument, and the new polarization state makes the striped pair of electric signal that the first photodetector is sent
Than degree in the range of pre-set contrast threshold；
Wherein, the core concept of simulated annealing is to repeat " to generate new explanation-calculating according to Metropolis criterion
New explanation (is given up) in object function difference-receiving " iterative process.In Polarization Control, the initial solution x that randomly generatesi, target letter
Numerical value is fxi), function is generated by state and generates new explanation xj, target function value is f (xj)；New explanation xjReceived probability, by
The corresponding transition probability of Metropolis criterion determines：
In above formula, T is current state temperature.By PrIt is compared with the random number n between 0~1, if Pr>=n then receives new explanation
xjFor current optimal solution, otherwise retain former solution xiFor current optimal solution.After transformation by multiple this solution, it can obtain working as
The local optimum polarization state of system under preceding state temperature T, then gradually decay T values, searches for the part under each state temperature T most
Excellent polarization state.When T values tend to 0, algorithm terminates, and current optimum point at this time is the globe optimum of system.
The phase-delay quantity that actually used electric polarization instrument generates is 0-5 π, and state generates function in the following way：
In formula, s is maximum search step-length；C is random ± 1.The latter Searching point can rely on a preceding search result,
Therefore directly utilize target function value f (xi) dynamic adjustment step-size in search.Target function value is smaller illustrate it is nearer from target polarization state,
Small step-length can increase the probability that global optimum is found near current optimal value；Target function value is larger to be illustrated from target polarization
Farther out, big step-length can accelerate the speed advanced to global optimum to state, and the maximum search cycle-index of optimal value each in this way can
It greatly reduces, saves search time.
Signal degree of correlation control unit 8, for calculating the signal degree of correlation of the two path signal, when the signal degree of correlation surpasses
When crossing pre-set relevance threshold, second is applied to using variable step simulated annealing change each position vector is corresponding
Voltage value on electric polarization instrument is carried out continuous control to the polarization state of second electrode instrument incident light and is carried out using feedback signal
Optimal value is searched for, until the signal degree of correlation of the two path signal is in the range of pre-set relevance threshold.
Wherein, after the fringe contrast of the interference signal of the first photodetector is met the requirements, the first electricity can be kept
Polarizer control voltage is constant, using the interference signal that the first photodetector and the second photodetector export as feedback letter
Number, the degree of correlation of two signals is calculated, the software of the microprocessor of signal processing control unit is interfered according to the two-way fed back to be believed
Number the degree of correlation, variable step simulated annealing is utilized to change the corresponding electricity being applied on second electrode instrument of each position vector
Pressure value carries out continuous control to the polarization state of second electrode instrument incident light and carries out optimal value search using feedback signal, directly
To the corresponding two paths of signals of feedback signal the degree of correlation in the range of pre-set relevance threshold.
Preferably, balance control unit can control signal-balanced device by output voltage signal；Fringe contrast controls
Unit and signal degree of correlation control unit can control polarization beat length device by output voltage signal.
In the present embodiment, the search process in polarization beat length is carried out using variable step simulated annealing, is improved partially
Polarization state governing speed improves the efficiency of system, and the process can utilize the microprocessor in signal processing controller to complete,
Effectively reduce the complexity and dependence of equipment.
Preferably, signal processing controller can include：
Signal filters conditioning unit, can be used for the two-way electricity to the first photodetector and the transmission of the second photodetector
Signal is filtered conditioning, and will filter the two path signal transmission after improving and balance control unit, fringe contrast control
Unit and signal degree of correlation control unit.
The signal-balanced device can be adjustable optical attenuator, under balance control unit control, adjustment light path to decline
Subtract degree, adjustment two ways of optical signals balance.Preferably, the adjustable optical attenuator is gathered around there are two voltage input end, passes through adjusting
The attenuation degree of two voltage differential output control luminous powers.
Wherein, adjustable optical attenuator can be gathered around there are two voltage input end, and two voltage differential output control luminous powers decline
Subtract degree, adjustable optical attenuator is added in two-way optical channel, it can be by adjusting two ways of optical signals attenuation degree, by two-way light
Signal balancing, and signal strength is best after guarantee opto-electronic conversion.
The polarization beat length device can be electric polarization instrument, in fringe contrast control unit and signal degree of correlation control
Under unit control processed, fringe contrast control is carried out to the optical signal after balancing and the signal degree of correlation controls.Preferably, it is described
Electric polarization instrument is gathered around there are four the direction of extrusion staggered squeezer at 45 °, and control process passes through to four squeezers application electricity
It presses and the polarization state for inputting light wave is modulated, export the light wave of different polarization states.
Wherein, electric polarization instrument can be gathered around there are four the direction of extrusion staggered squeezer at 45 °, and it is right that the process of control passes through
The voltage that four squeezers apply various combination can carry out different modulation to the polarization state for inputting light wave, so as to export difference
The light wave of polarization state；Electric polarization instrument is added in the two-way optical channel of above-mentioned basic distributed fiberoptic sensor sensor fibre, it can
To realize Polarization Control by the polarization state for modulating the road optical signal.
The signal generator can include：Narrow linewidth laser 9, the first coupler 10, isolator 11, the first Y waveguide
12 and second Y waveguide 13, the narrow linewidth laser 9 connect with first coupler 10, first coupler 10 with every
It is connected from device 11, the isolator 11 is connect with the first Y waveguide 12 and the second Y waveguide 13, first Y waveguide 12 and described the
One signal-balanced device connection, second Y waveguide 13 are connect with the second signal balancer.
Preferably, M-Z interferometers include the second coupler and third coupler, two of described second coupler the same side
Port is connect respectively with the first polarization beat length device and the second photodetector, two ends of the opposite side of second coupler
It mouthful is connect with two ports of third coupler the same side, two ports of the opposite side of the third coupler are respectively with second
Polarization beat length device and the connection of the first photodetector.
Wherein, narrow linewidth laser as system source, can be used for emitting narrow linewidth flashlight, the first coupler can
Two beams are divided by 1: 1 with the narrow linewidth flashlight for emitting narrow linewidth laser, signal can be done respectively as double M-Z after light splitting
The light source of each interferometer in interferometer；And it is isolated with isolator；First Y waveguide and the second Y waveguide will can be done clockwise respectively
It relates to optical signal and interference light signal counterclockwise is modulated into sine wave signal；First adjustable optical attenuator and the second adjustable optical attenuator
The adjustment of two-way interference signal optical power attenuation can be completed, makes interference signal clockwise and interference signal balancing counterclockwise；
First electrode instrument completes the input optical signal polarization state adjustment of interferometer clockwise；Second electrode instrument completes interference counterclockwise
The input optical signal polarization state adjustment of instrument；Second coupler of M-Z interferometers can input coupling respectively as interferometer clockwise
Clutch and interferometer output coupler counterclockwise, the third coupler of M-Z interferometers can be used as interferometer counterclockwise to input coupling
Clutch and interferometer output coupler clockwise；；First photodetector can export optical signal as interferometer clockwise
Photo-electric conversion element is completed interferometer vibration electric signal clockwise and is obtained；Second photodetector can be used as interference counterclockwise
Instrument exports the photo-electric conversion element of optical signal, completes interferometer vibration electric signal counterclockwise and obtains；Signal processing controller utilizes
First photodetector and the second photodetector output signal, can to the first adjustable optical attenuator and second as feedback signal
Optical attenuator carries out adjustable attenuation, also carries out polarization state control to first electrode instrument and second electrode instrument input optical signal
System.
The optical fiber perimeter security protection system signal-to-noise ratio control device of the embodiment of the present invention, table 1 are to use signal-balanced device
It adjusts two-way interference signal balance and is not used under signal-balanced device two states, system disturbance same to same position is multiple
It is positioned to obtain the experimental data (unit of positioning result：m)：
Table 1
The position 280m of disturbance applied in known experiment, by experimental result it is found that being carried out clockwise when VOA is not used
During with two-way interference light signal balancing counterclockwise, the mean error of positioning is 141.1m, maximum deviation 248m；When using
When VOA carries out two-way interference light signal balancing clockwise and anticlockwise, the mean error of positioning is 1.2m, and maximum deviation is
3m.It can be found that positional accuracy improves about two orders of magnitude.It can be seen that carry out clockwise and anticlockwise two using VOA
Road interference light signal balancing can make system more accurate to the positioning of disturbance, so as to play the role of optimization to system.
Table 2 is using when variable step simulated annealing and variable step simulated annealing is not to polarization beat length, is carried out
Polarization beat length duration (unit：S)：
Table 2
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Not variable step | 5.4 | 4.8 | 18.4 | 6.8 | 10.6 | 5.2 |
| Variable step | 3.6 | 2.5 | 3.1 | 1.2 | 1.5 | 1.9 |
| 7 | 8 | 9 | 10 | Average duration | Maximum duration | |
| Not variable step | 4.9 | 4.5 | 6.5 | 6.9 | 7.4 | 18.4 |
| Variable step | 2.5 | 3.2 | 2.8 | 3.8 | 2.61 | 3.8 |
By experimental result it is found that when using that variable step simulated annealing is not to polarization beat length, once polarized
It is 7.4S, a length of 18.4S when maximum that state, which controls lasting average time,；When using variable step simulated annealing to polarization state
During control, it is 2.61S, a length of 3.8S when maximum to carry out a polarization beat length lasting average time.It can be found that it uses
The variable step simulated annealing average time lasting to polarization state one secondary control of progress reduces 4.79S, control time section
Save nearly 2/3rds.
As shown in figure 4, a kind of optical fiber perimeter security protection system signal-to-noise ratio control method of the embodiment of the present invention, the side
Method includes：
Step 101：Signal generator generates two ways of optical signals clockwise and anticlockwise.
Step 102：Two ways of optical signals is transmitted to photodetector by signal-balanced device and polarization beat length device.
Step 103：The two ways of optical signals received is converted to two path signal by photodetector, and the two-way is electric
Signal is sent to signal processing controller.
Step 104：The signal processing controller receives the two path signal that photodetector is sent, according to the two-way
Electric signal controls signal-balanced device polarization beat length device to be controlled to exchange according to the electric signal two ways of optical signals balancing
Two ways of optical signals after balance carries out polarization state adjustment.
Step 105：Signal-balanced device is according to the control of signal processing controller to the two ways of optical signals balancing.
Step 106：Polarization beat length device according to the control of signal processing controller to the two ways of optical signals after balancing into
Row polarization state adjusts.
Preferably, the signal processing controller receives the two path signal that photodetector is sent, according to the two-way
Electric signal controls signal-balanced device polarization beat length device to be controlled to exchange according to the electric signal two ways of optical signals balancing
Two ways of optical signals after balance carries out polarization state adjustment, including：
The two path signal that the first photodetector and the second photodetector are sent is received, judges the two path signal
Peak-to-peak value difference whether be more than pre-set difference threshold；When more than pre-set difference threshold, control signal is put down
Weighing apparatus increases the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal is in pre-set difference threshold
In the range of value；
The fringe contrast of the electric signal of the first photodetector transmission is calculated, when fringe contrast is more than pre-set
During contrast threshold, search for new polarization beat length voltage using variable step simulated annealing and first electrode instrument is controlled
System, the new polarization state make the fringe contrast of electric signal that the first photodetector is sent in pre-set contrast threshold
In the range of value；
The signal degree of correlation of the two path signal is calculated, when the signal degree of correlation is more than pre-set relevance threshold
When, change the corresponding voltage value being applied on second electrode instrument of each position vector using variable step simulated annealing, it is right
The polarization state of second electrode instrument incident light carries out continuous control and carries out optimal value search using feedback signal, until described two
The signal degree of correlation of road electric signal is in the range of pre-set relevance threshold.
, as system source, it can specifically can be used for emitting narrow linewidth flashlight, the first coupling with narrow linewidth laser
The narrow linewidth flashlight that narrow linewidth laser emits can be divided into two beams by device by 1: 1, and signal can be respectively as double after light splitting
The light source of each interferometer in M-Z interferometers；And it is isolated with isolator；First Y waveguide and the second Y waveguide can be respectively by up times
Needle interference light signal and interference light signal counterclockwise are modulated into sine wave signal；First adjustable optical attenuator and the second adjustable light decay
The adjustment of two-way interference signal optical power attenuation can be completed by subtracting device, make interference signal clockwise and interference signal leveling counterclockwise
Weighing apparatus；First electrode instrument completes the input optical signal polarization state adjustment of interferometer clockwise；Second electrode instrument is completed counterclockwise
The input optical signal polarization state adjustment of interferometer；Second coupler of M-Z interferometers can be defeated respectively as interferometer clockwise
Enter coupler and interferometer output coupler counterclockwise, the third coupler of M-Z interferometers can be used as interferometer counterclockwise defeated
Enter coupler and interferometer output coupler clockwise；；First photodetector can be used as interferometer output light clockwise to believe
Number photo-electric conversion element, complete interferometer clockwise vibration electric signal and obtain；Second photodetector can be used as counterclockwise
Interferometer exports the photo-electric conversion element of optical signal, completes interferometer vibration electric signal counterclockwise and obtains；Signal processing controller,
By the use of the first photodetector and the second photodetector output signal as feedback signal, to the first adjustable optical attenuator and
Two adjustable optical attenuators carry out adjustable attenuation, also carry out polarization state to first electrode instrument and second electrode instrument input optical signal
Control.
First photodetector and the second photodetector will respectively interfere electric signal output clockwise and anticlockwise
Conditioning unit is filtered to signal, signal filters conditioning unit and the interference signal clockwise after conditioning is sent into the first light decay down control
Subelement, fringe contrast control unit and signal degree of correlation control unit, signal filter conditioning unit by the inverse time after conditioning
Needle interference signal is sent into the second light decay down control subelement and signal degree of correlation control unit, the first light decay down control subelement and
Second light decay down control subelement collective effect after two paths of signals is made to reach balance requirement, starts fringe contrast control unit
With signal degree of correlation control unit, signal filters conditioning unit and the first photo detector signal after conditioning is sent into fringe contrast
Control unit is spent, fringe contrast control unit exports control voltage and gives first electrode instrument, wanted until fringe contrast meets
It asks, which terminates, and signal, which filters conditioning unit, believes the first photo detector signal after conditioning and the second photodetector
Number be sent into signal degree of correlation control unit, the signal degree of correlation control unit export controls voltage give second electrode instrument control list
Member, until the process terminates after the signal degree of correlation is met the requirements.So as to complete system signal noise ratio control.
The optical fiber perimeter security protection system signal-to-noise ratio control method of the embodiment of the present invention is optical fiber perimeter security protection system
The method that system signal-to-noise ratio control device uses, therefore the feature and optical fiber of optical fiber perimeter security protection system signal-to-noise ratio control method
Periphery safety protection system signal-to-noise ratio control device is identical, and details are not described herein.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (7)
- A kind of 1. optical fiber perimeter security protection system signal-to-noise ratio control device, which is characterized in that the optical fiber perimeter security protection System signal noise ratio control device includes：At signal generator, signal-balanced device, polarization beat length device, photodetector and signal Controller is managed, the signal generator is connect with the signal-balanced device, the signal-balanced device and the polarization beat length device Connection, the polarization beat length device are connect with the photodetector, the photodetector and the signal processing controller Connection, the signal processing controller are connect with the signal-balanced device and polarization beat length device；Signal generator, for generating two ways of optical signals clockwise and anticlockwise；Signal-balanced device, for the control according to signal processing controller to the two ways of optical signals balancing；Polarization beat length device carries out polarization state for the control according to signal processing controller to the two ways of optical signals after balancing Adjustment；Photodetector, for receiving the two ways of optical signals after polarization state adjustment, and the two ways of optical signals after polarization state is adjusted It is converted to two path signal and is sent to signal processing controller；Signal processing controller for receiving the two path signal of photodetector transmission, is controlled according to the two path signal Signal-balanced device controls polarization beat length device to two after balancing to the two ways of optical signals balancing according to the electric signal Road optical signal carries out polarization state adjustment；The signal-balanced device includes the first signal-balanced device and second signal balancer, and the polarization beat length device includes first Polarization beat length device and the second polarization beat length device, the photodetector include the first photodetector and the second photodetection Device, the first signal-balanced device are connect with the first polarization beat length device, and the first polarization beat length device and the first photoelectricity are visited Device connection is surveyed, the second signal balancer is connect with the second polarization beat length device, the second polarization beat length device and second Photodetector connects；The signal processing controller includes：Control unit is balanced, for receiving the two path signal that the first photodetector and the second photodetector are sent, is judged Whether the peak-to-peak value difference of the two path signal is more than pre-set difference threshold；When more than pre-set difference threshold When, signal-balanced device is controlled to increase the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal is pre- In the range of the difference threshold first set；Fringe contrast control unit for calculating the fringe contrast for the electric signal that the first photodetector is sent, works as striped When contrast is more than pre-set contrast threshold, new polarization beat length voltage is searched for using variable step simulated annealing First electrode instrument is controlled, the new polarization state makes the fringe contrast of electric signal that the first photodetector is sent In the range of pre-set contrast threshold；Signal degree of correlation control unit, for calculating the signal degree of correlation of the two path signal, when the signal degree of correlation is more than pre- During the relevance threshold first set, second electrode is applied to using variable step simulated annealing change each position vector is corresponding Change the voltage value on instrument, continuous control is carried out to the polarization state of second electrode instrument incident light and carried out using feedback signal optimal Value search, until the signal degree of correlation of the two path signal is in the range of pre-set relevance threshold.
- 2. optical fiber perimeter security protection system signal-to-noise ratio control device according to claim 1, which is characterized in that the letter Number balancer is adjustable optical attenuator, under balance control unit control, adjusting attenuation degree, adjustment two-way light letter Number balance.
- 3. optical fiber perimeter security protection system signal-to-noise ratio control device according to claim 2, which is characterized in that it is described can Optical attenuator is gathered around there are two voltage input end, by the attenuation degree for adjusting two voltage differential output control luminous powers.
- 4. optical fiber perimeter security protection system signal-to-noise ratio control device according to claim 1, which is characterized in that described inclined Polarization state controller is electric polarization instrument, under fringe contrast control unit and the control of signal degree of correlation control unit, exchanging Optical signal after balance carries out fringe contrast control and the control of the signal degree of correlation.
- 5. optical fiber perimeter security protection system signal-to-noise ratio control device according to claim 4, which is characterized in that the electricity Polarizer is gathered around there are four the direction of extrusion staggered squeezer at 45 °, and control process passes through to four squeezers application voltages The polarization state for inputting light wave is modulated, exports the light wave of different polarization states.
- 6. optical fiber perimeter security protection system signal-to-noise ratio control device according to claim 1, which is characterized in that the letter Number generator includes：Narrow linewidth laser, the first coupler, isolator, the first Y waveguide and the second Y waveguide, the narrow linewidth swash Light device is connect with first coupler, and first coupler is connect with isolator, the isolator and the first Y waveguide and Two Y waveguides connect, and first Y waveguide is connect with the described first signal-balanced device, second Y waveguide and the second signal Balancer connects.
- 7. a kind of optical fiber perimeter security protection system signal-to-noise ratio control method, which is characterized in that the method includes：Signal generator generates two ways of optical signals clockwise and anticlockwise；Two ways of optical signals is transmitted to photodetector by signal-balanced device and polarization beat length device；The two ways of optical signals received is converted to two path signal, and the two path signal is sent to letter by photodetector Number processing controller；The signal processing controller receives the two path signal that photodetector is sent, and is controlled and believed according to the two path signal Number balancer controls polarization beat length device to the two-way after balancing to the two ways of optical signals balancing according to the electric signal Optical signal carries out polarization state adjustment；Signal-balanced device is according to the control of signal processing controller to the two ways of optical signals balancing；Polarization beat length device carries out polarization state adjustment according to the control of signal processing controller to the two ways of optical signals after balancing；The signal processing controller receives the two path signal that photodetector is sent, and is controlled and believed according to the two path signal Number balancer controls polarization beat length device to the two-way after balancing to the two ways of optical signals balancing according to the electric signal Optical signal carries out polarization state adjustment, including：The two path signal that the first photodetector and the second photodetector are sent is received, judges the peak of the two path signal Whether peak difference values are more than pre-set difference threshold；When more than pre-set difference threshold, signal-balanced device is controlled Increase the attenuation degree of the big light path of peak-to-peak value, until the peak-to-peak value difference of two path signal is in pre-set difference threshold model In enclosing；The fringe contrast of the electric signal of the first photodetector transmission is calculated, when fringe contrast is more than pre-set comparison When spending threshold value, search for new polarization beat length voltage using variable step simulated annealing and first electrode instrument controlled, The new polarization state makes the fringe contrast of electric signal that the first photodetector is sent in pre-set contrast threshold In the range of；The signal degree of correlation of the two path signal is calculated, when the signal degree of correlation is more than pre-set relevance threshold, profit Change the corresponding voltage value being applied on second electrode instrument of each position vector with variable step simulated annealing, to the second electricity The polarization state of polarizer incident light carries out continuous control and carries out optimal value search using feedback signal, until the two-way telecommunications Number the signal degree of correlation in the range of pre-set relevance threshold.
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