CN105973280B - The discrete Multi- Switch condition detecting system and method for light feedback semiconductor laser - Google Patents
The discrete Multi- Switch condition detecting system and method for light feedback semiconductor laser Download PDFInfo
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—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
- 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
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Abstract
The invention discloses the discrete Multi- Switch condition detecting system and method for a kind of smooth feedback semiconductor laser, detecting system includes semiconductor laser, data acquisition and procession unit and Multi- Switch sensing network；Semiconductor laser carries photodetector, and its output light feeds back to semiconductor laser through Multi- Switch sensing network, and intensity chaos optical signal is generated in semiconductor laser, is transformed into the collection of chaos electric signal input data and processing unit through photodetector；Multi- Switch sensing network includesNIndividual branch road, each branch road connect a photoswitch by one section of optical fiber.The step of whether being more than predetermined threshold value with the peak value of each light intensity feedback formula position of the switch corresponding section in auto-correlation function of the detection method including identification chaos electric signal.The present invention can carry out remote monitoring under complex environment on off state, and the state of multiple switch is detected exactly；It is simple in construction flexibly, cost it is low, using more convenient.
Description
Technical field
The present invention relates to the discrete Multi- Switch condition detecting system and method for a kind of semiconductor laser, especially a kind of light
The discrete Multi- Switch condition detecting system and method for feedback semiconductor laser, belong to electric circuit inspection technical field.
Background technology
On off state detection can apply to many fields.Such as it is used for the on off operating mode detection of circuit in power system.
Available for safety-security area, if not to the warehouse of telecommunications area grating, bank custody, the door and window of confidential data room and storage of hazardous product
The opening of door and window etc. whether carry out accurate detection and timely early warning, it will cause very big economic loss, or even catastrophic
Consequence.Also the temperature of some specified points, liquid level, air pressure, hydraulic pressure etc. reach alarm after a certain threshold value etc., can also use switch
The detection of state is realized.Therefore, the detection on off state has very strong practical value.
When need detection state switch it is many when, they can be connected using optical fiber, form optical fiber and pass
Sensing system, realize to the long-range of each on off state while detect.Such as utilize optical time domain reflection（OTDR）Optical fiber sensing system.
However, its cost is higher, it is expensive, and real-time is poor.On the other hand, these measured switch are often discrete distribution
, it is not necessary that utilize full distributed OTDR optical fiber sensing systems.
Side's sth. made by twisting etc. discloses a kind of switching value optical fiber sensing system and its short-term cross-correlation positioning method, the patent No.：ZL
2011 1 0321749.2, the sensor-based system formed using light-pulse generator and coupler carries out state-detection simultaneously to multiple switch amount
Positioning.This method is simple in construction, due to being positioned using cross-correlation method in short-term, has certain anti-noise ability, but system is limited by arteries and veins
Wash the pulse width and pulse period and detector sensitivity in source off, distinguishable minimum switch distance with it is detectable most
Big switch distance is very limited.
The present invention is carried using the good autocorrelation performance of the nonlinear characteristic and chaotic signal of light feedback semiconductor laser
A kind of detection method of the reflective discrete Multi- Switch state of new luminous intensity is gone out.
The content of the invention
The purpose of the present invention is to be directed to deficiency of the prior art, there is provided a kind of semiconductor laser of light feedback it is discrete
Multi- Switch condition detecting system and method.
The technical solution adopted in the present invention is：
Technical scheme one：
A kind of discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser, including semiconductor laser, data
Collection and processing unit and Multi- Switch sensing network；Described semiconductor laser carries photodetector；The semiconductor swashs
The output light of light device feeds back to semiconductor laser through the Multi- Switch sensing network, and intensity is generated in semiconductor laser and is mixed
Ignorant optical signal, it is transformed into chaos electric signal, the described data acquisition and procession of the chaos electric signal input through photodetector
Unit；The Multi- Switch sensing network includesNIndividual branch road, each branch road connects a photoswitch by one section of optical fiber, described
Photoswitch switchs for light intensity feedback formula；The data acquisition and procession unit is used for the auto-correlation for recognizing the chaos electric signal
Whether the peak value in function with each photoswitch position corresponding section is more than predetermined threshold value.
The discrete Multi- Switch condition detecting system of the smooth feedback semiconductor laser also includes photodetector and main coupling
Clutch；Described semiconductor laser is without photodetector；The output end of described semiconductor laser and described main coupling
The I ports of clutch are connected, and the coupling port a of the main coupler connects the data acquisition and procession through the photodetector
Unit；The straight-through port b of described main coupler is connected with described Multi- Switch sensing network；Described semiconductor laser is defeated
The coupling port a of the main coupler described in intensity chaos optical signal warp gone out enters described photodetector, is transformed into chaos
Described data acquisition and procession unit is inputted after electric signal.
The coupling ratio of described main coupler is not more than 20%.
The Multi- Switch sensing network can be cascaded structure, parallel-connection structure, or connection in series-parallel mixed structure.
The Multi- Switch sensing network of the cascaded structure passes throughN- 1 1X2 fiber coupler is divided into step by stepNIndividual branch road.
The Multi- Switch sensing network of the parallel-connection structure passes through a 1XNFiber coupler is once divided intoNIndividual branch road.
Technical scheme two：
A kind of inspection of discrete Multi- Switch condition detecting system for light feedback semiconductor laser described in technical scheme one
Survey method, comprises the following steps：
Step 1：Calculate the auto-correlation function of the chaos electric signal；
Step 2：The auto-correlation function is recognized in the peak value with each light intensity feedback formula position of the switch corresponding section
Whether predetermined threshold value is more than；If it is, judging that corresponding photoswitch is in open mode, otherwise judge that respective light intensities reaction type opens
Pass is in closure state.
The step of detection method also includes filtering the auto-correlation function according to each photoswitch position：Filter out
With the peak value outside the delay positions of each photoswitch position correspondence and zero time delay position.
The photoswitch switchs for light intensity feedback formula.
Using above-mentioned technical proposal, the present invention obtains following beneficial effect：
1st, the present invention can carry out remote monitoring under complex environment on off state, exactly to the state of multiple switch
Detected；
2nd, present system is simple in construction flexibly, cost is low.
3rd, due to being active sensor, the present invention is detectable distant, also in the absence of the limitation of distinguishable distance.
4th, the present invention uses the detection of relative quantity, and testing result and the attenuation of light in loop are substantially unrelated, as long as can
The peak value size of auto-correlation secondary peak during resolution opening and closing state, other detection methods with needing consideration absolute magnitude
Compare, using more convenient.
Brief description of the drawings
Fig. 1 is the structure chart of the embodiment of the present invention 1；
Fig. 2 is the Multi- Switch sensing network structure chart in the embodiment of the present invention 1 and embodiment 3；
Fig. 3 is the structure chart of the embodiment of the present invention 2；
Fig. 4 is the Multi- Switch sensing network structure chart in the embodiment of the present invention 2；
Fig. 5 is DC signal when whole photoswitches all close in the embodiment of the present invention 3；
Fig. 6 is auto-correlation function when whole photoswitches all close in the embodiment of the present invention 3；
Fig. 7 is chaos electric signal when photoswitch 1 is opened in the embodiment of the present invention 3；
Fig. 8 is auto-correlation function when photoswitch 1 is opened in the embodiment of the present invention 3；
Fig. 9 is the chaos electric signal 3 photoswitches are opened in the embodiment of the present invention 3 simultaneously when；
Figure 10 is the auto-correlation function 3 photoswitches are opened in the embodiment of the present invention 3 simultaneously when；
Figure 11 is the knot after the filtered processing of auto-correlation function when whole photoswitches all close in the embodiment of the present invention 3
Fruit；
Figure 12 is the result after the filtered processing of auto-correlation function when photoswitch 1 is opened in the embodiment of the present invention 3；
The knot after the filtered processing of auto-correlation function 3 photoswitches are opened in the embodiment of the present invention 3 in Figure 13 simultaneously when
Fruit.
Embodiment
Embodiment 1：
As shown in figure 1, a kind of discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser, including semiconductor swash
Light device, data acquisition and procession unit and Multi- Switch sensing network；Described semiconductor laser carries photodetector；It is described
The output light of semiconductor laser feeds back to semiconductor laser through the Multi- Switch sensing network, raw in semiconductor laser
Into intensity chaos optical signal, it is transformed into chaos electric signal through photodetector, the described data of the chaos electric signal input are adopted
Collection and processing unit；The Multi- Switch sensing network includesNIndividual branch road, each branch road connect a light by one section of optical fiber and opened
Close, the photoswitch switchs for light intensity feedback formula；The data acquisition and procession unit is used to recognize the chaos electric signal
Auto-correlation function in the peak value of each photoswitch position corresponding section whether be more than predetermined threshold value.
The Multi- Switch sensing network is cascaded structure or connection in series-parallel mixed structure.
As shown in Fig. 2 the Multi- Switch sensing network of the cascaded structure passes throughN- 1 1X2 fiber coupler is divided into step by stepN
Individual branch road.
Embodiment 2：
Visited as shown in figure 3, the discrete Multi- Switch condition detecting system of the smooth feedback semiconductor laser also includes photoelectricity
Survey device and main coupler；Described semiconductor laser is without photodetector；The output end of described semiconductor laser with
The I ports of described main coupler are connected, and the coupling port a of the main coupler connects the data through the photodetector
Collection and processing unit；The straight-through port b of described main coupler is connected with described Multi- Switch sensing network；Described partly leads
The coupling port a of main coupler described in the intensity chaos optical signal warp of body laser output enters described photodetector,
Described data acquisition and procession unit is inputted after being transformed into chaos electric signal.
The coupling ratio of described main coupler is not more than 20%, to allow more light to enter Multi- Switch sensing network.
The Multi- Switch sensing network is parallel-connection structure.
As shown in figure 4, the Multi- Switch sensing network of the parallel-connection structure passes through a 1XNFiber coupler is once divided intoN
Individual branch road.
Embodiment 3：
The present embodiment and the difference of embodiment 2 are that the Multi- Switch sensing network is cascaded structure, andN=3.Described
The fiber lengths of each branch road can be according to the physical location determination that light intensity feedback formula switchs, can also be with light intensity feedback formula
The position of the switch is not quite identical.In a word, as long as the position of different photoswitches, light can be told in final testing result
Fine length can need neatly to determine according to actually detected.
Structure, material or reflectivity to described photoswitch etc. do not make particular requirement, as long as can pass through feedback light
The state of intensity size discrimination light intensity feedback formula switch.
To the 1X2 couplers and 1X in described Multi- Switch sensing networkNThe coupling ratio of coupler has not a particular requirement, only
Each feedback branch is wanted to have sufficiently strong light feedback.
As shown in Figures 2 and 3, the present embodiment selects semiconductor laser and cascaded structure without photodetector to open more
Close discrete three switch state detecting system that sensing network constructs a light feedback semiconductor laser, including a semiconductor
Laser, the 2X2 fiber couplers of one 20/80 are as main coupler, a photodetector, a data acquisition and procession
Unit, the 2X2 fiber couplers of two 50/50 are used for coupler 1- couplers 2, three section single-mould fibers, photoswitch 1- photoswitches
3.The output light of semiconductor laser is divided into two-way by main coupler, and 20% output light is transformed into electricity by photodetector
Signal, data acquisition and procession unit is sent into, the Wave data of detecting system output is acquired and handled.Main coupler
The light of other end output is divided equally into two-way after coupler 1, anti-by photoswitch 1 after length is 2.1km optical fiber all the way
It is emitted back towards, another way is divided equally into two-way by coupler 2 again, respectively after optical fiber and 3.1km optical fiber that length is 890m,
Reflected back by photoswitch 2 and photoswitch 3.
In the present embodiment, semiconductor laser selects the Distributed Feedback Laser module of Mianyang, Sichuan ultraphotic communication Co., Ltd, it
Operation wavelength be 1528nm.The pigtail ends for the port that main coupler and coupler 1- couplers 2 are not used smear optical fiber
Cream is matched, to reduce influence of the tail optical fiber end face reflection to system.All single-mode fibers are using G.652 standard single-mode fiber, light
Electric explorer is the PIN-TIA detectors of Shenzhen Photon company production.Data acquisition and procession unit is by a common microcomputer
The data of collection are sent to calculating by calculation machine and the digital oscilloscopes of PicoScope 5203 of PICO companies of Britain composition, oscillograph
Machine, handled with Matlab software programmings.Each photoswitch is replaced with speculum, and the single-mode fiber being connected with speculum is FC/APC types
Optical fiber, single-mode fiber end is not reflected when not accessing speculum, and when accessing speculum, reflectivity is about 90%.Therefore, reflect
Whether mirror, which accesses, just correspond to whether photoswitch is opened.
Fig. 5~Figure 10 is that a speculum does not connect, only speculum connect at photoswitch 1 and in photoswitch 1- light respectively
Switch at 3 while connect speculum, namely 3 photoswitches are all closed, only photoswitch 1 is opened and photoswitch 1- photoswitches 3 are same
When open in the case of output electric signal and its auto-correlation function.In Fig. 5-Fig. 6, the light of laser output is not reflected back
Go, do not form light feedback, what is now detected is direct current signal, and its auto-correlation function only has the main peak of zero time delay position.Scheming
In 7- Fig. 8, only the place branch road of photoswitch 1 forms light feedback.The random chaos electric signal of output class, its auto-correlation function existt 1Occur symmetrical auto-correlation secondary peak at=± 21us, and light 1 two-way time from laser to photoswitch is justt 1=
21us.Therefore, it is possible to judge that it is open mode to go out photoswitch 1, other photoswitches are closure state.When having multiple photoswitches simultaneously
During opening, there are multiple feedback branches in system, output is still chaos electric signal, as shown in figure 9, but can go out in its auto-correlation function
Existing multiple auto-correlation secondary peaks, as shown in Figure 10.Delay positions where secondary peak are also equal to light from laser to inductive switch
Two-way time.In Fig. 10,t 1=t 1=21us,t 2=t 2=8.9us,t 3=t 3=31us, it can be determined that go out photoswitch 1- photoswitches 3 all
For open mode.
But when there are multiple feedback branches, also occur in the auto-correlation function of the chaos electric signal of output other times
Peak, as shown in Figure 10.Only retain the auto-correlation secondary peak of the delay positions with treating photometry switch position correspondence and ignore remaining secondary peak
To filter unnecessary secondary peak.The result that Fig. 6, Fig. 8, Figure 10 auto-correlation function obtain after filtering is respectively such as Figure 11-Figure 13 institutes
Show, it can clearly be seen that each photoswitch position corresponds to the auto-correlation secondary peak of a non-zero.At some photoswitch
When closure state, its corresponding minor peaks is below 0.05, and when it is opened, corresponding minor peaks be then up to 0.5 with
On.Given threshold is 0.1, is respectively compared whether auto-correlation minor peaks corresponding to three photoswitch positions are more than 0.1, you can
Learn whether they are open mode.
Embodiment 4：
A kind of inspection of discrete Multi- Switch condition detecting system for light feedback semiconductor laser described in technical scheme one
Survey method, comprises the following steps：
Step 1：Calculate the auto-correlation function of the chaos electric signal；
Step 2：The auto-correlation function is recognized in the peak value with each light intensity feedback formula position of the switch corresponding section
Whether predetermined threshold value is more than；If it is, judging that corresponding photoswitch is in open mode, otherwise judge that corresponding photoswitch is in closure
State.
The step of detection method also includes filtering the auto-correlation function according to each photoswitch position：Filter out
With the peak value outside the delay positions of each photoswitch position correspondence and zero time delay position.
The present invention is using series, parallel or connection in series-parallel mixed structure being formed between multiple photoswitches and semiconductor laser
Multiple feedback branches.When each photoswitch is opened, its corresponding feedback branch produces stronger reflected light, photoswitch closure
When, corresponding branch road does not produce light and fed back, or feedback is very weak, can be ignored.Here the state and reflective light intensity of photoswitch
The corresponding relation of size can be according to actual determination, usually, and the closure state of photoswitch corresponds to small reflectivity, and open shape
State is set to big reflectivity, is so easy to early warning.When all photoswitches are all in closure state, each branch road is all anti-without light
Feedback, system output is direct current signal, and its auto-correlation function only has a self correlated peak in zero time delay position, referred to as main peak.And
When some photoswitch is opened, its corresponding branch road forms sufficiently strong light feedback, exports chaotic waves.Its auto-correlation function meeting
There are self correlated peak new, with photoswitch position correspondence, referred to as secondary peak, delay positions corresponding to secondary peakτ i Equal to light from partly leading
Two-way time of the body laser to respective light intensities reflective switcht i , i.e.,
WhereincFor the spread speed of light in a vacuum,nFor the refractive index of fiber core, can approximation be taken as 1.5,L i Fori
Individual photoswitch from semiconductor laser with a distance from,i=1, 2, …N,NFor the switch number of state to be measured.
When there is multiple photoswitches to open, multiple auto-correlation secondary peaks occur in the auto-correlation function of the chaotic signal of output,
And the time corresponding to each auto-correlation secondary peak is equal to light from semiconductor laser to the two-way time of corresponding photoswitch.Therefore, lead to
Cross and whether there is secondary peak and occur having can determine whether that photoswitch is opened, the delay positions of secondary peak and the light of semiconductor laser reach certain
The two-way time of individual/a little photoswitch is consistent, can thus judge this/a little photoswitch is in open mode.To there is multiple light
The interference auto-correlation secondary peak that switch occurs when opening simultaneously, due to photoswitch position be to determine it is constant, can be by only retaining
Ignore the method for remaining secondary peak with the auto-correlation secondary peaks of the delay positions of photoswitch position correspondence to filter unnecessary secondary peak.Cross
In auto-correlation function after filter there is the auto-correlation secondary peak of non-zero in the delay positions of only photoswitch position correspondence.When some light is opened
When pass is in closure state, its corresponding secondary peak is very weak, and when it is opened, corresponding secondary peak then substantially becomes strong.Therefore can
To set a suitable threshold value, it is somebody's turn to do as long as whether the auto-correlation time peak-to-peak value being respectively compared corresponding to each position of the switch is more than
Threshold value, you can learn whether the switch is open mode.
Claims (6)
- A kind of 1. discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser, it is characterised in that：Swash including semiconductor Light device, data acquisition and procession unit and Multi- Switch sensing network；Described semiconductor laser carries photodetector；It is described The output light of semiconductor laser feeds back to semiconductor laser through the Multi- Switch sensing network, raw in semiconductor laser Into intensity chaos optical signal, it is transformed into chaos electric signal through photodetector, the described data of the chaos electric signal input are adopted Collection and processing unit；The Multi- Switch sensing network includesNIndividual branch road, each branch road connect a light by one section of optical fiber and opened Close, the photoswitch switchs for light intensity feedback formula；The data acquisition and procession unit is used to recognize the chaos electric signal Auto-correlation function in the peak value of each photoswitch position corresponding section whether be more than predetermined threshold value.
- 2. the discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser according to claim 1, its feature exist In：Also include photodetector and main coupler；Described semiconductor laser is without photodetector；Described semiconductor swashs The output end of light device is connected with the I ports of described main coupler, and the coupling port a of the main coupler is through the photodetection Device connects the data acquisition and procession unit；The straight-through port b of described main coupler and described Multi- Switch sensing network It is connected；The coupling port a of main coupler described in the intensity chaos optical signal warp of described semiconductor laser output enters institute The photodetector stated, described data acquisition and procession unit is inputted after being transformed into chaos electric signal.
- 3. the discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser according to claim 2, its feature exist In：The coupling ratio of described main coupler is not more than 20%.
- 4. the discrete Multi- Switch condition detecting system of smooth feedback semiconductor laser according to claim 1 or 2, its feature It is：The Multi- Switch sensing network can be cascaded structure, parallel-connection structure, or connection in series-parallel mixed structure；The tandem junction The Multi- Switch sensing network of structure passes throughN- 1 1X2 fiber coupler is divided into step by stepNIndividual branch road；The Multi- Switch of the parallel-connection structure Sensing network passes through a 1XNFiber coupler is once divided intoNIndividual branch road.
- 5. a kind of discrete Multi- Switch condition detecting system using light feedback semiconductor laser described in claim 1 or 2 Detection method, comprise the following steps：Step 1：Calculate the auto-correlation function of the chaos electric signal；Step 2：Recognize the auto-correlation function with the peak value of each light intensity feedback formula position of the switch corresponding section whether More than predetermined threshold value；If it is, judging that respective light intensities reaction type switch is in open mode, otherwise judge that respective light intensities are anti- Feedback formula switch is in closure state.
- 6. detection method according to claim 5, it is characterised in that：The detection method also includes according to each light intensity The step of degree reaction type position of the switch filters to the auto-correlation function：Filter out and each light intensity feedback formula position of the switch pair Peak value outside the delay positions answered and zero time delay position.
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| 基于偏振混沌环形激光器的光纤分布传感系统;方捻，等;《光电子.激光》;20100331;第21卷(第3期);第335-339页 * |
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