CN109991735A - A kind of combined optical element and optical fiber current sensing device - Google Patents
A kind of combined optical element and optical fiber current sensing device Download PDFInfo
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- CN109991735A CN109991735A CN201810000690.9A CN201810000690A CN109991735A CN 109991735 A CN109991735 A CN 109991735A CN 201810000690 A CN201810000690 A CN 201810000690A CN 109991735 A CN109991735 A CN 109991735A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention provides a kind of combined optical element and including the optical fiber current sensing device of combined optical device; combined optical element includes electro-optic phase modulator and polarization-maintaining fiber coupler; electro-optic phase modulator and polarization-maintaining fiber coupler do not need to carry out fused fiber splice; greatly shorten the distance between electro-optic phase modulator and polarization-maintaining fiber coupler; and it does not need to carry out fusing point protection between the two; the reliability of combined optical device is greatly improved, while the influence vibrated to optical fiber current mutual inductor measurement accuracy can be effectively reduced.Optical fiber current sensing device provided by the invention includes combined optical device, laser, polarization-maintaining circulator, polarization maintaining optical fibre ring retard, quarter wave plate, current sensing unit and photodetector, structure is simple, utilize integrated combined optical device, the volume of optical fiber current sensing device is effectively reduced, improves the integrated level of optical fiber current sensing device.
Description
Technical field
The present invention relates to technical field of photo communication, and in particular to a kind of combined optical element and including combined optical device
Optical fiber current sensing device.
Background technique
Electro-optic phase modulator and polarization-maintaining fiber coupler have heavy in fields such as optic communication, light sensing and Microwave photonics
The application wanted is one of the Primary Component in these systems.Electro-optic phase modulator is typically based on the linear electro-optic effect of crystal
(Pockels effect) is realized, linear electro-optic effect refers to that the variations in refractive index of crystal under electric field action is proportional to extra electric field
Effect.The widest electro-optic phase modulator of current application is the waveguide type electric light phase tune using the production of lithium columbate crystal material
Device processed, principle are that additional modulation voltage leads to lithium niobate fiber waveguide variations in refractive index, and then makes the phase by the waveguide light wave
Position variation, to realize phase-modulation.Lithium niobate waveguides electro-optic phase modulator has structure simple, and size is small, manufacture craft
The features such as maturation, (encapsulating tail optical fiber) easy to use.
Polarization-maintaining fiber coupler is the Primary Component for realizing linearly polarized light coupling, light splitting and multiplexing, its maximum feature
It is steadily transmit two orthogonal linearly polarized lights, and it is constant to be able to maintain respective polarization state, to become various military
Critical optical device needed for interferometric sensor, coherent light communication, optical fibre gyro and fibre optic hydrophone etc..
Electro-optic phase modulator and polarization-maintaining fiber coupler are two discrete devices, optical phase modulator in the prior art
By fused fiber splice between polarization-maintaining fiber coupler, distance is big between the two, and needs to protect optical fiber welding point.Work as light
When phase-modulator and polarization-maintaining fiber coupler are applied to fibre optic current sensor simultaneously, ambient vibration is to fibre optic current sensor
Measurement accuracy influence is very big, causes fibre optic current sensor reliability low.
Summary of the invention
In order to overcome it is above-mentioned need to carry out optical fiber welding point in the prior art protection and fibre optic current sensor reliability
Low deficiency, the present invention provide a kind of combined optical element and the optical fiber current sensing device including combined optical device, combination
Optical device includes electro-optic phase modulator and polarization-maintaining fiber coupler, optical fiber current sensing device include combined optical device,
Laser, polarization-maintaining circulator, polarization maintaining optical fibre ring retard, quarter wave plate, current sensing unit and photodetector, laser it is defeated
Outlet connects the first port of polarization-maintaining circulator, and the second port of polarization-maintaining circulator connects combined optical device, third port
Photodetector is connected, combined optical device connects quarter wave plate, quarter wave plate and current sense list by polarization maintaining optical fibre ring retard
Member connection, optical fiber current sensing device structure is simple, integrated level and high reliablity.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, the present invention provides a kind of combined optical device, including electro-optic phase modulator and polarization-maintaining fiber coupler；
The electro-optic phase modulator is Y waveguide structure, and the first port of the electro-optic phase modulator is protected by first
Polarisation fibre connects the first port of polarization-maintaining fiber coupler, and second port connects polarization maintaining optical fibre coupling by the second polarization maintaining optical fibre
The second port of device.
The distance between the electro-optic phase modulator and polarization-maintaining fiber coupler are less than 5cm.
On the other hand, also a kind of optical fiber current sensing device of the present invention, including combined optical device, laser, polarization-maintaining ring
Shape device, polarization maintaining optical fibre ring retard, quarter wave plate, current sensing unit and photodetector；
The first port of the output end connection polarization-maintaining circulator of the laser, the second port of the polarization-maintaining circulator connect
Combined optical device is connect, third port connects photodetector, and the combined optical device is connected by polarization maintaining optical fibre ring retard
Quarter wave plate is connect, the quarter wave plate is connect with current sensing unit.
The laser that the laser issues enters the first port of polarization-maintaining circulator, and the laser passes through polarization-maintaining circulator
The third port of second port injection electro-optic phase modulator.
The electro-optic phase modulator is modulated laser, and modulated laser is divided into two-way, and two-way laser leads to respectively
Cross the first polarization maintaining optical fibre and the second polarization maintaining optical fibre injection polarization-maintaining fiber coupler.
The polarization-maintaining fiber coupler couples the two-way laser of injection, obtains the first linearly polarized light, and described first
Linearly polarized light injects quarter wave plate by polarization maintaining optical fibre ring retard.
First linearly polarized light is converted to the first circularly polarized light by the quarter wave plate, and by the first circularly polarized light Injection Current
Sensing unit.
The current sensing unit includes sensor coil and reflecting mirror；
The sensor coil changes the angle of polarization of the first circularly polarized light by electromagnetic induction, obtains the second circularly polarized light；Institute
It states the second circularly polarized light and quarter wave plate is returned to by reflecting mirror, the second circularly polarized light is converted to the second linear polarization by the quarter wave plate
Light.
Second linearly polarized light passes sequentially through polarization maintaining optical fibre ring retard and combined optical device returns to polarization-maintaining circulator, and
Photodetector is injected by the third port of polarization-maintaining circulator, the second linearly polarized light is converted to telecommunications by the photodetector
Number.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
Combined optical element provided by the invention includes electro-optic phase modulator and polarization-maintaining fiber coupler, electric light phase tune
Device processed is Y waveguide structure, and the first port of electro-optic phase modulator connects polarization-maintaining fiber coupler by the first polarization maintaining optical fibre
First port, second port connect the second port of polarization-maintaining fiber coupler, electric light phase-modulation by the second polarization maintaining optical fibre
Device and polarization-maintaining fiber coupler do not need to carry out fused fiber splice, greatly shorten electro-optic phase modulator and polarization maintaining optical fibre coupling
The distance between device, and do not need to carry out fusing point protection between the two, greatly improve the reliability of combined optical device；
Optical fiber current sensing device provided by the invention includes combined optical device, laser, polarization-maintaining circulator, polarization-maintaining light
Fine ring retard, quarter wave plate, current sensing unit and photodetector, the first of the output end connection polarization-maintaining circulator of laser
Port, the second port of polarization-maintaining circulator connect combined optical device, and third port connects photodetector, combination optical device
Part connects quarter wave plate by polarization maintaining optical fibre ring retard, and quarter wave plate connect with current sensing unit, and structure is simple, using integrated
The volume of optical fiber current sensing device is effectively reduced in combined optical device, improves the integrated level of optical fiber current sensing device；
In combined optical device provided by the invention, the distance between electro-optic phase modulator and polarization-maintaining fiber coupler are small
In 5cm, the influence vibrated to optical fiber current mutual inductor measurement accuracy can be effectively reduced.
Detailed description of the invention
Fig. 1 is combined optical device structure chart in the embodiment of the present invention 1；
Fig. 2 is optical fiber current sensing device structure chart in the embodiment of the present invention 2；
In figure, 1- electro-optic phase modulator, 2- polarization-maintaining fiber coupler, 3- laser, 4- polarization-maintaining circulator, 5- group light combination
Learn device, 6- polarization maintaining optical fibre ring retard, 7-1/4 wave plate, 8- current sensing unit, 9- photodetector.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
The embodiment of the present invention 1 provides a kind of combined optical device, and for concrete structure diagram as shown in Figure 1, in Fig. 1, A is combination
The third port of optical device, B are the first port of combined optical device, and C is the second port of combined optical device, and D is to protect
The third port of inclined fiber coupler；Combined optical device includes electro-optic phase modulator and polarization-maintaining fiber coupler；It is therein
Electro-optic phase modulator is Y waveguide structure, and the first port of electro-optic phase modulator connects polarization-maintaining light by the first polarization maintaining optical fibre
The first port of fine coupler, second port connect the second port of polarization-maintaining fiber coupler by the second polarization maintaining optical fibre.
The distance between electro-optic phase modulator and polarization-maintaining fiber coupler are less than 5cm in the embodiment of the present invention 1, due to two
Person does not need to carry out fused fiber splice, greatly shortens the distance between electro-optic phase modulator and polarization-maintaining fiber coupler, and
And do not need to carry out fusing point protection between the two, greatly improve the reliability of combined optical device.
Embodiment 2
The embodiment of the present invention 2 provides a kind of optical fiber current sensing device, as shown in Fig. 2, E indicates polarization-maintaining circulator in Fig. 2
First port, F indicates the second port of polarization-maintaining circulator, and G indicates the third port of inclined circulator, and H indicates polarization maintaining optical fibre coupling
The third port of clutch, the embodiment of the present invention 2 provide optical fiber current sensing device include embodiment 1 combined optical device,
Laser, polarization-maintaining circulator, polarization maintaining optical fibre ring retard, quarter wave plate, current sensing unit and photodetector；Specifically, wherein
Laser output end connection polarization-maintaining circulator first port, the second port of polarization-maintaining circulator connects combination optical device
Part, third port connect photodetector, and combined optical device connects quarter wave plate, quarter wave plate by polarization maintaining optical fibre ring retard
It is connect with current sensing unit.
The laser that laser therein issues enters the first port of polarization-maintaining circulator, laser pass through polarization-maintaining circulator the
Two-port netwerk injects the third port of electro-optic phase modulator, and electro-optic phase modulator is modulated laser, modulated laser
It is divided into two-way, two-way laser passes through the first polarization maintaining optical fibre and the second polarization maintaining optical fibre injection polarization-maintaining fiber coupler respectively；Polarization-maintaining light
Fine coupler couples the two-way laser of injection, obtains the first linearly polarized light, and the first linearly polarized light is prolonged by polarization maintaining optical fibre
Slow ring injects quarter wave plate；First linearly polarized light is converted to the first circularly polarized light by quarter wave plate, and the first circularly polarized light is injected
Current sensing unit.
Above-mentioned current sensing unit includes sensor coil and reflecting mirror；Sensor coil changes the first circle by electromagnetic induction
The angle of polarization of polarised light obtains the second circularly polarized light；Second circularly polarized light returns to quarter wave plate by reflecting mirror, and quarter wave plate is by the
Two circularly polarized lights are converted to the second linearly polarized light.
Second linearly polarized light passes sequentially through polarization maintaining optical fibre ring retard and combined optical device returns to polarization-maintaining circulator, and passes through
The third port of polarization-maintaining circulator injects photodetector, and the second linearly polarized light is converted to electric signal by photodetector, realizes
Conversion of the laser to electric signal.
The optical fiber current sensing device structure that the embodiment of the present invention 2 provides is simple, using integrated combined optical device, has
Effect reduces the volume of optical fiber current sensing device, improves the integrated level of optical fiber current sensing device.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (9)
1. a kind of combined optical device, which is characterized in that including electro-optic phase modulator and polarization-maintaining fiber coupler；
The electro-optic phase modulator is Y waveguide structure, and the first port of the electro-optic phase modulator passes through the first polarization-maintaining light
The first port of fibre connection polarization-maintaining fiber coupler, second port connect polarization-maintaining fiber coupler by the second polarization maintaining optical fibre
Second port.
2. combined optical device according to claim 1, which is characterized in that the electro-optic phase modulator and polarization maintaining optical fibre
The distance between coupler is less than 5cm.
3. a kind of optical fiber current sensing device, which is characterized in that including any combined optical device of claim 1-2,
Laser, polarization-maintaining circulator, polarization maintaining optical fibre ring retard, quarter wave plate, current sensing unit and photodetector；
The first port of the output end connection polarization-maintaining circulator of the laser, the second port connection group of the polarization-maintaining circulator
Optical device is closed, third port connects photodetector, and the combined optical device passes through polarization maintaining optical fibre ring retard connection 1/4
Wave plate, the quarter wave plate are connect with current sensing unit.
4. optical fiber current sensing device according to claim 3, which is characterized in that the laser that the laser issues enters
The first port of polarization-maintaining circulator, the laser inject the third of electro-optic phase modulator by the second port of polarization-maintaining circulator
Port.
5. optical fiber current sensing device according to claim 4, which is characterized in that the electro-optic phase modulator is to laser
It is modulated, modulated laser is divided into two-way, and two-way laser passes through the first polarization maintaining optical fibre and the injection of the second polarization maintaining optical fibre respectively
Polarization-maintaining fiber coupler.
6. optical fiber current sensing device according to claim 5, which is characterized in that the polarization-maintaining fiber coupler is to injection
Two-way laser coupled, obtain the first linearly polarized light, first linearly polarized light passes through polarization maintaining optical fibre ring retard injection 1/4
Wave plate.
7. optical fiber current sensing device according to claim 6, which is characterized in that the quarter wave plate is by the first linear polarization
Light is converted to the first circularly polarized light, and by the first circularly polarized light Injection Current sensing unit.
8. optical fiber current sensing device according to claim 7, which is characterized in that the current sensing unit includes sensitivity
Coil and reflecting mirror；
The sensor coil changes the angle of polarization of the first circularly polarized light by electromagnetic induction, obtains the second circularly polarized light；Described
Two circularly polarized lights return to quarter wave plate by reflecting mirror, and the second circularly polarized light is converted to the second linearly polarized light by the quarter wave plate.
9. optical fiber current sensing device according to claim 8, which is characterized in that second linearly polarized light passes sequentially through
Polarization maintaining optical fibre ring retard and combined optical device return to polarization-maintaining circulator, and inject photoelectricity by the third port of polarization-maintaining circulator
Second linearly polarized light is converted to electric signal by detector, the photodetector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810000690.9A CN109991735A (en) | 2018-01-02 | 2018-01-02 | A kind of combined optical element and optical fiber current sensing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810000690.9A CN109991735A (en) | 2018-01-02 | 2018-01-02 | A kind of combined optical element and optical fiber current sensing device |
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| CN109991735A true CN109991735A (en) | 2019-07-09 |
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| CN102608703A (en) * | 2012-02-14 | 2012-07-25 | 北京航空航天大学 | Optical fiber ring assembly packaging structure suitable for being directly coupled |
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| CN104132798A (en) * | 2014-07-25 | 2014-11-05 | 国家电网公司 | Y-waveguide integrated optics phase modulator modulation factor measurement device and method |
| CN104197924A (en) * | 2014-09-16 | 2014-12-10 | 北京航空航天大学 | Melting-point-free interference full photonic bandgap optical fiber gyro |
| CN104422437A (en) * | 2013-09-10 | 2015-03-18 | 北京世维通科技发展有限公司 | Fiber-optic gyroscope without optical fiber fusion point and manufacturing method of fiber-optic gyroscope |
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2018
- 2018-01-02 CN CN201810000690.9A patent/CN109991735A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005300422A (en) * | 2004-04-14 | 2005-10-27 | Toshiba Corp | Photocurrent detecting apparatus |
| CN102608703A (en) * | 2012-02-14 | 2012-07-25 | 北京航空航天大学 | Optical fiber ring assembly packaging structure suitable for being directly coupled |
| CN102721847A (en) * | 2012-06-15 | 2012-10-10 | 天津光拓科技有限公司 | Hybrid grating on-line temperature measurement type all-fiber current transformer and current detection method thereof |
| CN104422437A (en) * | 2013-09-10 | 2015-03-18 | 北京世维通科技发展有限公司 | Fiber-optic gyroscope without optical fiber fusion point and manufacturing method of fiber-optic gyroscope |
| CN104132798A (en) * | 2014-07-25 | 2014-11-05 | 国家电网公司 | Y-waveguide integrated optics phase modulator modulation factor measurement device and method |
| CN104197924A (en) * | 2014-09-16 | 2014-12-10 | 北京航空航天大学 | Melting-point-free interference full photonic bandgap optical fiber gyro |
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Application publication date: 20190709 |