CN105425429A - High-extinction-ratio optical-fiber acousto-optic frequency shifter - Google Patents
High-extinction-ratio optical-fiber acousto-optic frequency shifter Download PDFInfo
- Publication number
- CN105425429A CN105425429A CN201610010665.XA CN201610010665A CN105425429A CN 105425429 A CN105425429 A CN 105425429A CN 201610010665 A CN201610010665 A CN 201610010665A CN 105425429 A CN105425429 A CN 105425429A
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- CN
- China
- Prior art keywords
- acousto
- optic
- optical fiber
- diffraction light
- collimating apparatus
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Classifications
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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
- G02F1/11—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 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/125—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 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
-
- 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
- G02F1/11—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 based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a high-extinction-ratio optical-fiber acousto-optic frequency shifter. An input optical fiber collimator, an output optical fiber collimator, an acousto-optic block, a radio-frequency input port and a matched circuit are installed in a shell. The input optical fiber collimator and the output optical fiber collimator are located on the same side of the acousto-optic block and arranged in parallel, and a triple prism is arranged on the other side of the acousto-optic block and used for receiving first-stage diffraction light lambda1 generated when input light lambda0 of the input optical fiber collimator passes through the acousto-optic block, reflecting the first-stage diffraction light lambda1 two times and then enabling the first-stage diffraction light lambda1 to oppositely enter the acousto-optic block at the same angle. The output optical fiber collimator is used for receiving diffraction light lambda2 generated when the first-stage diffraction light lambda1 passes through the acousto-optic block. By means of the high-extinction-ratio optical-fiber acousto-optic frequency shifter, on the premise that a system is compact in structure, the extinction ratio of the optical-fiber acousto-optic frequency shifter is increased, and the requirement for the detection accuracy of the laser detection system is met.
Description
Technical field
The present invention relates to acousto-optical device, specifically a kind of High Extinction Ratio optical fiber acousto-optic frequency shifters.
Background technology
Optical fiber acousto-optic frequency shifters is because insertion loss is low, shift frequency precision is high, frequency stability good, volume is little, without many merits such as moving-members, be widely used in the laser coherence such as laser Dppler veloicty measurement, fibre optic hydrophone field of detecting.
Extinction ratio refers to that fiber acouso optic device is at the ratio with or without Output optical power during radiofrequency signal, represents with dB, and it is an important indicator of optical fiber acousto-optic frequency shifters.Fig. 1 is existing single unjacketed optical fiber acousto-optic frequency shifters light channel structure schematic diagram, input optical fibre collimating apparatus 1 is respectively equipped with and output optical fibre collimating apparatus 2, two optical fiber collimator acceptance angle is α, in existing structure in acousto-optic block 3 both sides, even if during without radiofrequency signal, still have portion of incident light λ
0enter output optical fibre collimating apparatus 2, thus constrain the further raising of extinction ratio, refer generally to be designated as about 50dB.And laser coherence detection is more and more higher to the requirement of detection accuracy, photoelectric detector sensitivity general is now all more than-90dB, by the extinction ratio of about 50dB, the extinction ratio of single unjacketed optical fiber acousto-optic frequency shifters cannot meet the detection accuracy requirement of whole system, therefore the pattern of system many employings two unjacketed optical fiber acousto-optic frequency shifters series connection realizes High Extinction Ratio, and this increases system bulk on the one hand, reduce integration, also reduce system reliability on the other hand.
Summary of the invention
For prior art above shortcomings, the object of the present invention is to provide a kind of optical fiber acousto-optic frequency shifters of High Extinction Ratio, the present invention, meeting under the compact prerequisite of system architecture, improves the extinction ratio of optical fiber acousto-optic frequency shifters, meets the requirement of laser detection system detection accuracy.
To achieve these goals, the technical solution used in the present invention is as follows:
High Extinction Ratio optical fiber acousto-optic frequency shifters, comprises input optical fibre collimating apparatus, output optical fibre collimating apparatus, acousto-optic block, rf inputs mouth, match circuit and shell; Input optical fibre collimating apparatus, output optical fibre collimating apparatus, acousto-optic block, rf inputs mouth and match circuit are installed in the enclosure; It is characterized in that: described input optical fibre collimating apparatus and output optical fibre collimating apparatus are positioned at acousto-optic block the same side and be arranged in parallel, be provided with prism at acousto-optic block opposite side, prism is for receiving input optical fibre collimating apparatus input light λ
0at the 1 order diffraction light λ by producing during acousto-optic block
1, and by 1 order diffraction light λ
1after two secondary reflections, oppositely enter acousto-optic block with identical angle, output optical fibre collimating apparatus is for receiving 1 order diffraction light λ
1by the diffraction light λ produced during acousto-optic block
2.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1. the present invention achieves twice shift frequency by prism reflection, and 0 grade of light λ
0due to not by prism reflection cannot be output optical fiber collimator receive, thus achieve ultrahigh extinction ratio, meet the requirement of laser detection system detection accuracy.
2. this structure belongs to single unjacketed optical fiber acousto-optic frequency shifters, and input optical fibre collimating apparatus and output optical fibre collimating apparatus are positioned at acousto-optic block the same side, has the advantage that size is little, compact conformation, integrated level are high, reliability is high, insertion loss is little.
Accompanying drawing explanation
Fig. 1-existing single unjacketed optical fiber acousto-optic frequency shifters light channel structure schematic diagram.
Fig. 2-High Extinction Ratio optical fiber acousto-optic frequency shifters structural representation of the present invention.
Fig. 3-High Extinction Ratio optical fiber acousto-optic frequency shifters light channel structure schematic diagram of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
Need based on system looks precision and integration, reliability, the present invention, by redesigning, utilizes a unjacketed optical fiber acousto-optic frequency shifters to achieve ultrahigh extinction ratio.Concrete structure is see Fig. 2 and Fig. 3, and upper as can be seen from figure, High Extinction Ratio optical fiber acousto-optic frequency shifters of the present invention, is made up of input optical fibre collimating apparatus 1, output optical fibre collimating apparatus 2, acousto-optic block 3, prism 4, rf inputs mouth 5, match circuit 6, shell 7.Input optical fibre collimating apparatus 1, output optical fibre collimating apparatus 2, acousto-optic block 3, prism 4, rf inputs mouth 5, match circuit 6 are arranged in shell 7, radiofrequency signal is by rf inputs mouth 5 matching connection circuit 6, and acousto-optic block 3 is welded on match circuit 6 by lead-in wire.
As can be seen from Fig. 3 light channel structure figure, light channel structure of the present invention is made up of input optical fibre collimating apparatus 1, output optical fibre collimating apparatus 2, prism 4, acousto-optic block 3, piezoelectric transducer 8, and piezoelectric transducer 8 is arranged on acousto-optic block 3 and leads on sound face.Light source input light λ
0acousto-optic block 3 is entered, radio-frequency input signals f by input optical fibre collimating apparatus 1
0produce sound wave k after carrying out electroacoustic conversion by piezoelectric transducer 8 and enter acousto-optic block 3, as input light λ
0with when meeting Bragg diffraction vector matching condition between sound wave k, because acoustic optic interaction effect produces 1 order diffraction light λ
1, 1 order diffraction light λ
1after prism 4 liang of secondary reflections, oppositely enter acousto-optic block 3 with identical angle, again acoustic optic interaction occurs with sound wave k, produce diffraction light λ
2(λ
2the 1 order diffraction light for λ 1), diffraction light λ
2be output optical fiber collimator 2 and receive output.0 grade of light λ
0due to not by prism 4 reflection cannot be output optical fiber collimator 2 receive, thus achieve ultrahigh extinction ratio.Light λ is inputted in schematic diagram
0, diffraction light λ
1, diffraction light λ
2between frequency relation be λ
1=λ
0+ f
0, λ
2=λ
1+ f
0.
Optical fiber collimator input end and output terminal are placed on the same side by the present invention, input 0 grade of light is filtered out by prism reflection secondary shift frequency, breach optical fiber collimator input/output terminal in the past and be positioned at the method for designing at acousto-optic block two ends, ultrahigh extinction ratio is achieved when not affecting shift frequency effect, with current two unjacketed optical fiber acousto-optic frequency shifters connect realize ultrahigh extinction ratio mode compared with, this structure has the advantage that size is little, compact conformation, reliability are high, insertion loss is little, meets current laser coherence detection system to the demand of detection accuracy.
The present invention 0 grade of β=λ of angle between light and diffraction light f
0/ V, wherein, λ is input optical wavelength, f
0for radio-frequency input signals frequency; V is the velocity of sound.When angle is too little, prism 4 can not play reflection λ
1and shield λ
0effect, thus need necessarily to be separated angle β.In real work, according to separable angle condition and various acousto-material character, optical fiber acousto-optic frequency shifters shift frequency frequency should be greater than 80MHz, and namely single shift frequency should be greater than 40MHz.Make a concrete analysis of as follows,
Optical fiber collimator defeated light radiation angle DA meets following formula:
Wherein, a is the core diameter of optical fiber, and NA is the numerical aperture of optical fiber, and BD is optical fiber collimator beam waist diameter.
For making 0 grade of light be separated completely with 1 order diffraction light, should meet
β＞2DA
According to various acousto-material velocity of sound comprehensive Design, show that shift frequency should be greater than 40MHz.
Simultaneously after being separated, prism will shield λ
0, distance acousto-optic block distance L need meet
L＞L0=BD/β
L0 is critical distance, and for the sake of assurance, in real work, prism is apart from acousto-optic block distance L > 1.5L0, and according to result of calculation and actual technique needs, the present invention's L value in practical adjustments is 20mm-40mm.
The present invention adopts optical fiber with holding input and output, produces first-order diffraction light carry out a shift frequency by acousto-optic block, and rear end carries out reflection process by prism to first-order diffraction light, secondary carries out shift frequency through acousto-optic block again and exports, thus filter out 0 grade of light, realize ultrahigh extinction ratio, and compact conformation.
The above embodiment of the present invention is only for example of the present invention is described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, other multi-form change and variations can also be made on the basis of the above description.Here cannot give exhaustive to all embodiments.Every belong to technical scheme of the present invention the apparent change of amplifying out or variation be still in the row of protection scope of the present invention.
Claims (2)
1. High Extinction Ratio optical fiber acousto-optic frequency shifters, comprises input optical fibre collimating apparatus, output optical fibre collimating apparatus, acousto-optic block, rf inputs mouth, match circuit and shell; Input optical fibre collimating apparatus, output optical fibre collimating apparatus, acousto-optic block, rf inputs mouth and match circuit are installed in the enclosure; It is characterized in that: described input optical fibre collimating apparatus and output optical fibre collimating apparatus are positioned at acousto-optic block the same side and be arranged in parallel, be provided with prism at acousto-optic block opposite side, prism is for receiving input optical fibre collimating apparatus input light λ
0at the 1 order diffraction light λ by producing during acousto-optic block
1, and by 1 order diffraction light λ
1after two secondary reflections, oppositely enter acousto-optic block with identical angle, output optical fibre collimating apparatus is for receiving 1 order diffraction light λ
1by the diffraction light λ produced during acousto-optic block
2.
2. High Extinction Ratio optical fiber acousto-optic frequency shifters according to claim 1, is characterized in that: 0 grade of light and 1 order diffraction light λ
1between angle β=λ f
0/ V, wherein, λ is optical wavelength, f
0for radio-frequency input signals frequency; V is the velocity of sound, f
0be greater than 40MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610010665.XA CN105425429A (en) | 2016-01-08 | 2016-01-08 | High-extinction-ratio optical-fiber acousto-optic frequency shifter |
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|---|---|---|---|
| CN201610010665.XA CN105425429A (en) | 2016-01-08 | 2016-01-08 | High-extinction-ratio optical-fiber acousto-optic frequency shifter |
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|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629524A (en) * | 2016-03-25 | 2016-06-01 | 福州腾景光电科技有限公司 | Array acoustic optical modulator and manufacturing method thereof |
| CN109283707A (en) * | 2018-12-10 | 2019-01-29 | 中国科学院上海光学精密机械研究所 | The shift frequency amount multiplying assembly of optical fiber acousto-optic frequency shifters |
| CN111856792A (en) * | 2019-04-26 | 2020-10-30 | 武汉中科锐择光电科技有限公司 | Three-port acousto-optic modulator |
| CN113219684A (en) * | 2021-05-08 | 2021-08-06 | 武汉菲联光电科技有限公司 | Acousto-optic modulator |
Citations (4)
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| JPH06250136A (en) * | 1993-02-26 | 1994-09-09 | Ando Electric Co Ltd | Light frequency shifter |
| JPH06289349A (en) * | 1993-03-30 | 1994-10-18 | Ando Electric Co Ltd | Optical frequency shifter |
| CN1560561A (en) * | 2004-02-17 | 2005-01-05 | 天津大学 | Adjustable optical phase shifter and phase-shift process |
| CN103076654A (en) * | 2013-03-04 | 2013-05-01 | 中国电子科技集团公司第二十六研究所 | Polarization maintaining optical fiber acousto-optic frequency shift device |
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2016
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Patent Citations (4)
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| JPH06250136A (en) * | 1993-02-26 | 1994-09-09 | Ando Electric Co Ltd | Light frequency shifter |
| JPH06289349A (en) * | 1993-03-30 | 1994-10-18 | Ando Electric Co Ltd | Optical frequency shifter |
| CN1560561A (en) * | 2004-02-17 | 2005-01-05 | 天津大学 | Adjustable optical phase shifter and phase-shift process |
| CN103076654A (en) * | 2013-03-04 | 2013-05-01 | 中国电子科技集团公司第二十六研究所 | Polarization maintaining optical fiber acousto-optic frequency shift device |
Non-Patent Citations (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629524A (en) * | 2016-03-25 | 2016-06-01 | 福州腾景光电科技有限公司 | Array acoustic optical modulator and manufacturing method thereof |
| CN109283707A (en) * | 2018-12-10 | 2019-01-29 | 中国科学院上海光学精密机械研究所 | The shift frequency amount multiplying assembly of optical fiber acousto-optic frequency shifters |
| CN111856792A (en) * | 2019-04-26 | 2020-10-30 | 武汉中科锐择光电科技有限公司 | Three-port acousto-optic modulator |
| CN113219684A (en) * | 2021-05-08 | 2021-08-06 | 武汉菲联光电科技有限公司 | Acousto-optic modulator |
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Application publication date: 20160323 |
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