CN105222896B - Method of using magneto-optic fiber to research propagation characteristic of polarized light in ring-down cavity - Google Patents
Method of using magneto-optic fiber to research propagation characteristic of polarized light in ring-down cavity Download PDFInfo
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- CN105222896B CN105222896B CN201510555257.8A CN201510555257A CN105222896B CN 105222896 B CN105222896 B CN 105222896B CN 201510555257 A CN201510555257 A CN 201510555257A CN 105222896 B CN105222896 B CN 105222896B
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Abstract
The invention discloses a method of using a magneto-optic fiber to research a propagation characteristic of polarized light in a ring-down cavity and belongs to a polarized light propagation apparatus technology field in the ring-down cavity. Main points of a technical scheme are characterized in that firstly, light emitted by an amplitude modulation laser passes through a polarizer; then, through a first optical fiber coupler, linearly polarized light is added to the magneto-optic fiber; because of birefringence and magnetic adjustable performance of the magneto-optic fiber, the polarized light generates an optical rotation angle; the optical signal is fed back to the first optical fiber coupler via a optical fiber coupler and acts again; finally, through an analyzer and a photoelectric detector, the signal is input into a digital signal processor. By using the method in the invention, change measurement of any non-electrical physical quantity (pressure, a temperature and the like) which can generate a current or a magnetic field change can be realized; simultaneously, the optical fiber couplers are used to realize electrical isolation between circuits and noise interference filtering so that good safety and guarantee effects are achieved. Response time delay of the method is only about 10 mus so that the method is suitable for an occasion which has a high requirement to a response speed.
Description
Technical field
The invention belongs to polarised light swings transmission device technical field in chamber declining, and in particular to one kind is ground using magneto-optic optical fiber
Polarised light is studied carefully in the method for swinging propagation characteristic in chamber of declining.
Background technology
With the research of developing rapidly for Modern Laser, photoelectron and optical communication technique, magneto-optic memory technique and magnetic-optic devices
Have and develop on a large scale very much.Due to a series of superperformances that magnetic-optic devices has, magnetic-optic devices optic communication, optical information processing and
The technical fields such as signal measurement have a wide range of applications.Magneto-optic optical fiber is in Intelligent optical fiber sensing, adjustable comb filtering, magnetic non-thread
Property switch and the optical information processing field such as nonlinear pulse shaping there is very big application prospect.Because magneto-optic optical fiber is both with two-fold
Penetrate property and there is Faraday effect again, therefore it is just more complicated to study propagation of the polarised light in magneto-optic optical fiber.
The content of the invention
Present invention solves the technical problem that there is provided a kind of propagate in chamber declining to be swung using magneto-optic optical fiber research polarised light
The method of characteristic, the method swings curve of output change by analysis modulation size of current with declining, and finally gives the rotation of magnetic rotation optical fiber
The Changing Pattern of optic angle.
The present invention adopts the following technical scheme that one kind is existed using magneto-optic optical fiber research polarised light to solve above-mentioned technical problem
Decline the method for swinging propagation characteristic in chamber, it is characterised in that：It is sequentially provided with the amplitude modulation being connected by optical fiber along light transmission direction to swash
Light device, the polarizer, decline and swing chamber, analyzer and photodetector, wherein decline swinging chamber by the first fiber coupler, the second fiber coupling
Device, magneto-optic optical fiber and polarization maintaining optical fibre are constituted, and one end of the first fiber coupler passes through magneto-optic with one end of the second fiber coupler
Optical fiber is connected, and the other end of the first fiber coupler is connected with the other end of the second fiber coupler by polarization maintaining optical fibre, magneto-optic
The magnetic field produced by faraday's coil on optical fiber, amplitude modulation laser device is connected by circuit with modulating signal source, photodetector
It is connected with digital signal processor, the polarizer is parallel to each other with analyzer, the light that first amplitude modulation laser device sends is first passed through and is polarized
Device, is then added to linearly polarized light on magneto-optic optical fiber by the first fiber coupler, because magneto-optic optical fiber is under externally-applied magnetic field
Birefringence and magnetic adjustability, make polarised light produce angle of rotation, and this optical signal is exported again through the second fiber coupler part,
Another part feeds back to the first fiber coupler and acts on again, moves in circles, and output intensity produces change, until decaying to zero,
The optical signal of output inputs a signal into digital signal processor through analyzer and photodetector；
The angle that polarised light is rotated under Faraday magnetooptical effect effect is with it by the length of gyrotropi crystalAnd magnetic
InductionRelation be expressed as：
（1）
The magneto-optic rotation produced by faraday's coil, proportionality coefficient are controlled for DC currentWith medium character and use
Light frequency it is relevant, polarised light institute direction of rotation is relevant with the magnetic field intensity in crystal, its magnetic induction density B and faraday electricity
The relation of logical current strength I is in magnetic coil number of turn n and coil：
（2）
In above formulaRepresented is the magnetic conductivity under vacuum, by（1）With（2）Formula can obtain the cove plane institute anglec of rotation of light
Degree, be through the inverse polarization angle produced by magneto-optic effect and the relation of electric current：
（3）
Formula（3）InFor constant, thereforeWithBe formed proportionate relationship be linear.
The optical signal of polarization is entered to decline and swings chamber from coupler, during two polarizer keeping parallelisms, what photodetector was detected
Light intensity is most strong, records this moment for initial time.Pulsed light Jing couplers are coupled into optic fiber ring-shaped cavity, can detour very along ring
Multi-turn, often around a circle, because at magneto-optic fused fiber splice, the light loss of coupler and optical fiber etc. and magneto-optic optical fiber produce polarised light
The angle of polarization, the intensity for detecting light by photodetector constantly reduces over time, understands light in light by experiment and theory analysis
When transmitting in fibre annular-type cavity, the output intensity regularity of distribution is：
（4）
（5）
（6）
Formula（4）In99 times of the light intensity detected for initial time photodetector,EFor
When the light intensity theoretical value that detects of photodetector,For the angle of rotation that magneto-optic optical fiber is produced.Formula（5）InFor light in a fiber
Transmission speed, L be optical fiber ring length.A is loss value when light is transmitted in fiber optic loop：
（7）
Formula（7）InFor the absorption coefficient of polarization maintaining optical fibre, L is optical fiber ring length,For the absorption coefficient of magneto-optic optical fiber, l is
Magneto-optic fiber lengths, C is the insertion loss of two couplers,Scattered color for polarization maintaining optical fibre is lost,For the scattered color of magneto-optic optical fiber
Loss, finally gives output intensityEWith electric currentIThe expression formula of relation is：
（8）
The present invention has compared with prior art advantages below：
（1）Have studied a kind of polarised light based on Faraday effect and decline in magnetic rotation optical fiber and swing propagation characteristic in cavity configuration
Method, while realizing the research to optical rotatory substance optically-active characteristic；
（2）System architecture is simple, compact, especially sensitivity are high, it is possible to achieve arbitrarily can produce electric current or
The non-electrical physical quantity of changes of magnetic field（Pressure, temperature etc.）The measurement of change；
（3）Measurement process simplifies, convenient rapid, effectively overcomes loaded down with trivial details flow process present in traditional measurement method；
（4）Electrical isolation between circuit is realized using fiber coupler and filter noise and interference, and play well
Safety guarantee is acted on；
（5）The system response delay time only has 10 μ s or so, it is adaptable to the exigent occasion of response speed.
Description of the drawings
Fig. 1 is the light path principle figure of invention.
Drawing explanation：1st, modulating signal source, 2, amplitude modulation laser device, 3, the polarizer, the 4, first fiber coupler, 5, magneto-optic light
Fibre, 6, solenoid, the 7, second fiber coupler, 8, analyzer, 9, photodetector, 10, digital signal processor, 11, protect
Polarisation is fine.
Specific embodiment
The particular content of the present invention is described in detail with reference to accompanying drawing.One kind is swung in chamber declining using magneto-optic optical fiber research polarised light
The method of propagation characteristic, is sequentially provided with by the connected amplitude modulation laser device 2 of optical fiber, the polarizer 3, declines and swing along light transmission direction
Chamber, analyzer 8 and photodetector 9, wherein decline swinging chamber by the first fiber coupler 4, the second fiber coupler 7, magneto-optic optical fiber 5
Constitute with polarization maintaining optical fibre 11, one end of the first fiber coupler 4 passes through the phase of magneto-optic optical fiber 5 with one end of the second fiber coupler 7
Even, the other end of the first fiber coupler 4 is connected with the other end of the second fiber coupler 7 by polarization maintaining optical fibre 11, magneto-optic light
By solenoid 6 added with magnetic field on fine 5, amplitude modulation laser device 2 is connected by circuit with modulating signal source 1, and photodetector 9 leads to
Cross circuit to be connected with digital signal processor 10.
（1）Magneto-optic optical characteristic test
By amplitude modulation laser device, the polarizer, fiber coupler, magneto-optic optical fiber, analyzer, photodetector and data signal
Reason module composition magneto-optic optical fiber optically-active platform for testing characteristics.
（2）Fiber coupler
The polarizer is parallel to each other with analyzer, has maximum output light intensity under conditions of without externally-applied magnetic field, adds additional
During magnetic field, optical signal a part of Jing couplers output in magneto-optic optical fiber, another part continues to return magneto-optic optical fiber, circulates past
Multiple, output intensity produces change, until decaying to zero.
（3）Amplitude modulation laser device
Experiment porch is using with high power wide range ASE light sources and tunable laser sources.Desk-top ASE light sources are to aim at optical fiber
Sensing, optical passive component test, the amplified spontaneous emission source of spectrum analysis design.Its output waveband be C-band, maximum output
Power is 17dBm.Flatness preferably, can be used for the characteristic test of magneto-optic optical fiber parameter and analysis near 1550nm.
The present invention swings cavity configuration by declining, and the optical signal of polarization produces deflection through magneto-optic optical fiber, then by analysis not
Optically active fiber magneto-optic rotation, additional modulation electric current point are studied with corresponding modulation output laser amplitude under current strength size
Not with the corresponding relation that swings curve of declining, so that it is determined that optically-active parameter.Decline and swing cavity configuration high resolution, stable performance, sensitivity is high.
The basic principles, principal features and advantages of the present invention have been shown and described above, without departing from spirit of the invention and
On the premise of scope, the present invention also has various changes and modifications, and these changes and improvements both fall within claimed invention
Scope.
Claims (1)
1. a kind of utilization magneto-optic optical fiber research polarised light is in the method for swinging propagation characteristic in chamber of declining, it is characterised in that：Pass along light
Defeated direction is sequentially provided with by the connected amplitude modulation laser device of optical fiber, the polarizer, declines and swing chamber, analyzer and photodetector, wherein
Decline and swing chamber and be made up of the first fiber coupler, the second fiber coupler, magneto-optic optical fiber and polarization maintaining optical fibre, the first fiber coupler
One end is connected with one end of the second fiber coupler by magneto-optic optical fiber, the other end of the first fiber coupler and the second optical fiber coupling
The other end of clutch is connected by polarization maintaining optical fibre, and magneto-optic optical fiber produces magnetic field by faraday's coil, and amplitude modulation laser device passes through line
Road is connected with modulating signal source, and photodetector is connected with digital signal processor, and the polarizer is parallel to each other with analyzer, first
The light that amplitude modulation laser device sends first passes through the polarizer, then linearly polarized light is added to into magneto-optic optical fiber by the first fiber coupler
On, due to birefringence of the magneto-optic optical fiber under externally-applied magnetic field and magnetic adjustability, make polarised light produce angle of rotation, this optical signal is again
Export through the second fiber coupler part, another part feeds back to the first fiber coupler and acts on again, moves in circles, defeated
Go out light strong production change, until decaying to zero, the optical signal of output inputs a signal into number through analyzer and photodetector
Word signal processor, the optical signal of polarization is entered to decline and swings chamber from coupler, during two polarizer keeping parallelisms, photodetector detection
The light intensity for arriving is most strong, records this moment for initial time, and pulsed light Jing couplers are coupled into optic fiber ring-shaped cavity, can be around along ring
The many circles of row, often around a circle, because at magneto-optic fused fiber splice, the light loss of coupler and optical fiber etc. and magneto-optic optical fiber make polarised light
The angle of polarization is produced, the intensity for detecting light by photodetector constantly reduces over time, light is understood by experiment and theory analysis
When transmitting in optic fiber ring-shaped cavity, the output intensity regularity of distribution is：
Output intensityEWith electric currentIThe expression formula of relation is：
。
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| CN106323879A (en) * | 2016-08-16 | 2017-01-11 | 河南师范大学 | Method capable of measuring concentration of optical rotation solution based on AC/DC modulated magneto-optic effect |
| CN108548658B (en) * | 2018-01-23 | 2020-09-22 | 电子科技大学 | Method for simultaneously measuring stress and optical loss of single-layer film optical element |
| CN113625477A (en) * | 2020-05-09 | 2021-11-09 | 中天科技光纤有限公司 | Optical isolator |
Citations (5)
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|---|---|---|---|---|
| US4442350A (en) * | 1981-08-17 | 1984-04-10 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic sensor with enhanced immunity to random environmental perturbations |
| US5644397A (en) * | 1994-10-07 | 1997-07-01 | The Texas A&M University System | Fiber optic interferometric circuit and magnetic field sensor |
| CN102314002A (en) * | 2011-09-06 | 2012-01-11 | 电子科技大学 | Polarization controller |
| CN202334535U (en) * | 2011-11-14 | 2012-07-11 | 电子科技大学 | Bi-directional multichannel light-operated optical information processing device |
| CN104181748A (en) * | 2014-09-15 | 2014-12-03 | 中国科学院半导体研究所 | Microwave pulse signal generating device based on light-operated nonlinear annular mirror |
-
2015
- 2015-09-02 CN CN201510555257.8A patent/CN105222896B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442350A (en) * | 1981-08-17 | 1984-04-10 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic sensor with enhanced immunity to random environmental perturbations |
| US5644397A (en) * | 1994-10-07 | 1997-07-01 | The Texas A&M University System | Fiber optic interferometric circuit and magnetic field sensor |
| CN102314002A (en) * | 2011-09-06 | 2012-01-11 | 电子科技大学 | Polarization controller |
| CN202334535U (en) * | 2011-11-14 | 2012-07-11 | 电子科技大学 | Bi-directional multichannel light-operated optical information processing device |
| CN104181748A (en) * | 2014-09-15 | 2014-12-03 | 中国科学院半导体研究所 | Microwave pulse signal generating device based on light-operated nonlinear annular mirror |
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