CN103293604B - Based on the accurate fibre delay line of prism of corner cube and the method for accurate Time delay control - Google Patents
Based on the accurate fibre delay line of prism of corner cube and the method for accurate Time delay control Download PDFInfo
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- CN103293604B CN103293604B CN201310239921.9A CN201310239921A CN103293604B CN 103293604 B CN103293604 B CN 103293604B CN 201310239921 A CN201310239921 A CN 201310239921A CN 103293604 B CN103293604 B CN 103293604B
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Abstract
The invention discloses a kind of precision delay line based on prism of corner cube, comprise optical fiber collimator, prism of corner cube, ball-screw and package casing, two optical fiber collimators are arranged on one end of package casing, prism of corner cube and ball-screw are placed in package casing, the string face of prism of corner cube is relative with the optical emission exit of optical fiber collimator, and the string face of described prism of corner cube is coated with anti-reflection film, and three conical surfaces are coated with and increase anti-film, prism of corner cube is fixed in lens mount, and lens mount is connected with ball-screw by contiguous block.The present invention is reasonable in design, easy to use, and postpone precision high, insertion loss is little, and structure is simple, is conducive to realizing instrumentation and through engineering approaches.
Description
Technical field
The present invention relates to split-second precision delay technology field, particularly relate to a kind of a kind of method of accurate fibre delay line based on prism of corner cube and accurate Time delay control.
Background technology
Optical precision postpones to be mainly used in phased-array radar, the fields such as Optical Sampling.Especially, in Optical Sampling, sampling precision is directly decided by postpone precision.Current optical delay, mainly through stretching optical fiber, adopts prism to carry out the method such as reflecting, the shortcomings such as wherein stretching optical fiber method exists loss greatly, uncontrollable, irrecoverable; Free space related method thereof is adopted to have extremely strong operability, general employing prism reflects, like this accuracy requirement debug to prism very high, and Insertion Loss is larger in movable process, consider the problems such as physical construction kinematic accuracy, there is larger problem in this kind of method simultaneously in delay precision and insertion loss always.
Therefore, how to design the high and lag line that insertion loss is little of a kind of precision and method that accurately test postpones length and become the direction that these those skilled in the art make great efforts.
Summary of the invention
One object of the present invention is just to provide a kind of accurate fibre delay line based on prism of corner cube, solves the problem that prior art is difficult to realize high precision and low insertion loss simultaneously.
Another object of the present invention is just to provide a kind of method of accurate Time delay control, achieves high precision and controls and low insertion loss.
Object of the present invention is realized by following technical proposals:
A kind of accurate fibre delay line based on prism of corner cube, comprise optical fiber collimator, prism of corner cube, ball-screw and package casing, two optical fiber collimators are arranged on one end of package casing, prism of corner cube and ball-screw are placed in package casing, the string face of prism of corner cube is relative with the optical emission exit of optical fiber collimator, and the string face of described prism of corner cube is coated with anti-reflection film, and three conical surfaces are coated with and increase anti-film, prism of corner cube is fixed in lens mount, and lens mount is connected with ball-screw by contiguous block.
The feature of above-mentioned prism of corner cube is: no matter incident beam is incident with which kind of angle, and reflected light is all parallel with incident light, and with incident light relative to prism of corner cube Central Symmetry.Therefore, the absolute parallel of incident light and emergent light can be ensured.
Further, described optical fiber collimator comprises single-mode fiber, stainless-steel tube, GRIN Lens and globe lens, installs GRIN Lens and globe lens successively in stainless-steel tube, and stainless-steel tube connects single-mode fiber near one end of GRIN Lens.
This GRIN Lens and globe lens are optical fibre microlens, compact, light wave is transmitted by single-mode fiber, after GRIN Lens, waist radius obviously reduces, but the angle of divergence of light beam has certain increase on the original basis, so arrange globe lens after GRIN Lens, its effect is exactly the angle of divergence reducing input beam.By adopting the combination of above-mentioned GRIN Lens and globe lens, changing waist radius and the angle of divergence of incident beam, making the parallel injection of light beam.
Further, described ball-screw comprises adjusting knob, shaft coupling, ball screw, feed screw nut one, feed screw nut two and motion circle, adjusting knob is connected with ball screw by shaft coupling, feed screw nut one is threaded with ball screw, feed screw nut two and motion snare are connected on ball screw, and motion circle connects as one with feed screw nut one by feed screw nut two.
Further, lens mount is enclosed by contiguous block be connected with motion.
Further, on lens mount, symmetry offers spring eye, mounting spring in spring eye, and spring is in compressive state, between spring and package casing inwall, arrange steel ball.
This accurate fibre delay line regulates light in the distance of free-space propagation by ball-screw, realizes precision time delay and controls; Low insertion loss is realized by optical fiber collimator.
A method for accurate Time delay control, light wave is successively through GRIN Lens and globe lens, and then incident angle cone prism, after prism of corner cube reflection, light wave rotates 180 °, then penetrates after globe lens and GRIN Lens successively.
Further, light wave is injected through conical reflecting from the string face of prism of corner cube, and the string face of this prism of corner cube is coated with anti-reflection film, and the conical surface is coated with and increases anti-film.
Further, described anti-reflection film is the anti-reflection film to optical wavelength 1550nm, and increasing anti-film is to the anti-film of the increasing of optical wavelength 1550nm.
Compared with prior art, beneficial effect of the present invention is: reasonable in design, easy to use, and postpone precision high, insertion loss is little, and structure is simple, is conducive to realizing instrumentation and through engineering approaches.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is confined state schematic diagram of the present invention;
Fig. 3 is the structural representation of optical fiber collimator in the present invention;
Fig. 4 is the structural representation of prism of corner cube in the present invention;
Fig. 5 is the structural representation of ball-screw in the present invention;
Fig. 6 is A-A cut-open view in Fig. 5;
Fig. 7 is the partial enlarged drawing at B place in Fig. 6;
Fig. 8 is the three-dimensional structure diagram of ball-screw in the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the present invention is further illustrated.
As shown in Figures 1 to 8, a kind of accurate fibre delay line based on prism of corner cube, comprise optical fiber collimator 1, prism of corner cube 2, ball-screw 3 and package casing 4, two optical fiber collimators 1 are installed in parallel in one end of package casing 4, prism of corner cube 2 and ball-screw 3 are placed in package casing 4, the string face of prism of corner cube 2 is relative with the optical emission exit of optical fiber collimator 1, the string face 21 of described prism of corner cube 2 is coated with the anti-reflection film to optical wavelength 1550nm, three conical surfaces 22 are coated with the anti-film of the increasing of optical wavelength 1550nm, whole reflectivity reaches more than 95%, prism of corner cube 2 is fixed in lens mount 5, lens mount 5 is connected with ball-screw 3 by contiguous block 6.
As shown in Figure 3, described optical fiber collimator 1 comprises single-mode fiber 11, stainless-steel tube 12, GRIN Lens 13 and globe lens 14, install GRIN Lens 13 and globe lens 14 in stainless-steel tube 12 successively, stainless-steel tube 12 connects single-mode fiber 11 near one end of GRIN Lens 13.This optical fiber collimator 1 launch spot diameter 4.2mm, insertion loss is less than 0.2dB, and the emergent light angle of divergence is less than 0.0166 °, and within the scope of 0 ~ 1m, these two optical fiber collimator 1 coupling losses are lower than 0.8dB.
As shown in Fig. 5 to Fig. 8, described ball-screw 3 comprises adjusting knob 31, shaft coupling 32, ball screw 33, feed screw nut 1, feed screw nut 2 35 and motion circle 36, adjusting knob 31 is connected with ball screw 33 by shaft coupling 32, feed screw nut 1 is threaded with ball screw 33, feed screw nut 2 35 and motion circle 36 are socketed on ball screw 33, and motion circle 36 connects as one with feed screw nut 1 by feed screw nut 2 35, lens mount 5 is connected with motion circle 36 by contiguous block 6.
On lens mount 5, symmetry offers spring eye (not shown in FIG.), mounting spring (not shown in FIG.) in spring eye, and spring is in compressive state, arranges steel ball (not shown in FIG.) between spring and package casing 4 inwall.
Above-mentioned ball-screw 3 can Precision trimming delay distance.And symmetria bilateralis is by Compress Spring and steel ball and encapsulating housing 4 contact internal walls, thus realize steadily postponing to regulate.
When this lag line assembles, need to carry out correcting to guarantee that two optical fiber collimator 1 emergent lights are parallel, concrete steps are as follows:
1. be fixed in lens mount 5 by the prism of corner cube 2 being used for reflecting by optical cement, lens mount 5 is connected with ball-screw 3 by contiguous block 6, then in overall loading package casing 4;
2. the front end of two optical fiber collimators 1 is stretched in package casing 4, and it is relative with the string face of prism of corner cube 2, the rear end of two optical fiber collimators 1 is fixed on sextuple adjusting bracket by fixture, the single-mode fiber 11 1 of two optical fiber collimators 1 connects light source, a connection light power meter, regulate sextuple adjusting bracket, monitoring optical power meter reading simultaneously, when Output optical power is more than 90%, fine setting optical fiber collimator 1 position is until light power meter reading is maximum, now, two optical fiber collimator 1 emergent lights are parallel;
3. adopt optical cement that two optical fiber collimators 1 are fixed on package casing 4 end, until optical cement takes off sextuple adjusting bracket after solidifying completely again, effectively can avoid optical fiber collimator 1 change in location that in optical cement process of setting, stress causes like this.
In use, light wave is beaten on prism of corner cube 2 from the injection of optical fiber collimator 1, and then after rotation 180 °, parallel returning enters another optical fiber collimator 1 and export.Ball screw 33 is driven to rotate by rotation of adjustment knob 31, the convert rotational motion of ball screw 33 is rectilinear motion by feed screw nut 1, thus drive prism of corner cube 2 to move around along ball screw 33, distance between adjustment optical fiber collimator 1 and prism of corner cube 2, reaches the object that precise hard_drawn tuhes postpones.
A method for accurate Time delay control, light wave, successively through GRIN Lens and globe lens, is then injected through conical reflecting from the string face of prism of corner cube, makes light wave rotate 180 °, then penetrates after globe lens and GRIN Lens successively.
The string face of above-mentioned prism of corner cube is coated with the anti-reflection film to optical wavelength 1550nm, and the conical surface is coated with the anti-film of the increasing of optical wavelength 1550nm.
The plated film of above-mentioned optical wavelength and prism of corner cube can be selected by demand.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the accurate fibre delay line based on prism of corner cube, it is characterized in that: comprise optical fiber collimator, prism of corner cube, ball-screw and package casing, two optical fiber collimators are arranged on one end of package casing, prism of corner cube and ball-screw are placed in package casing, the string face of prism of corner cube is relative with the optical emission exit of optical fiber collimator, the string face of described prism of corner cube is coated with anti-reflection film, three conical surfaces are coated with and increase anti-film, prism of corner cube is fixed in lens mount, lens mount is connected with ball-screw by contiguous block, on lens mount, symmetry offers spring eye, mounting spring in spring eye, spring is in compressive state, between spring and package casing inwall, steel ball is set, when this lag line assembles, need to carry out correcting to guarantee that two optical fiber collimator emergent lights are parallel, concrete steps are as follows:
Step one. be fixed in lens mount by the prism of corner cube being used for reflecting by optical cement, lens mount is connected with ball-screw by contiguous block, then in overall loading package casing;
Step 2. the front end of two optical fiber collimators is stretched in package casing, and it is relative with the string face of prism of corner cube, the rear end of two optical fiber collimators is fixed on sextuple adjusting bracket by fixture, and the single-mode fiber one of two optical fiber collimators connects light source, a connection light power meter, regulate sextuple adjusting bracket, monitoring optical power meter reading simultaneously, when Output optical power is more than 90%, fine setting optical fiber collimator position is until light power meter reading is maximum, now, two optical fiber collimator emergent lights are parallel;
Step 3. adopt optical cement two optical fiber collimators to be fixed on package casing end, until optical cement takes off sextuple adjusting bracket after solidifying completely again.
2. the accurate fibre delay line based on prism of corner cube according to claim 1, it is characterized in that: described optical fiber collimator comprises single-mode fiber, stainless-steel tube, GRIN Lens and globe lens, install GRIN Lens and globe lens successively in stainless-steel tube, stainless-steel tube connects single-mode fiber near one end of GRIN Lens.
3. the accurate fibre delay line based on prism of corner cube according to claim 2, it is characterized in that: described ball-screw comprises adjusting knob, shaft coupling, ball screw, feed screw nut one, feed screw nut two and motion circle, adjusting knob is connected with ball screw by shaft coupling, feed screw nut one is threaded with ball screw, feed screw nut two and motion snare are connected on ball screw, and motion circle connects as one with feed screw nut one by feed screw nut two.
4. the accurate fibre delay line based on prism of corner cube according to claim 3, is characterized in that: lens mount is enclosed by contiguous block be connected with motion.
5. the method adopting the accurate fibre delay line described in claim 3 or 4 to realize precise delay control, it is characterized in that: drive ball screw to rotate by rotation of adjustment knob, the convert rotational motion of ball screw is rectilinear motion by feed screw nut one, thus drive prism of corner cube to move around along ball screw, distance between adjustment optical fiber collimator and prism of corner cube, light wave is successively through GRIN Lens and globe lens, then incident angle cone prism, after prism of corner cube reflection, light wave rotates 180 °, then penetrates after globe lens and GRIN Lens successively.
6. method according to claim 5, is characterized in that: light wave is injected through conical reflecting from the string face of prism of corner cube, and the string face of this prism of corner cube is coated with anti-reflection film, and the conical surface is coated with and increases anti-film.
7. method according to claim 6, is characterized in that: described anti-reflection film is the anti-reflection film to optical wavelength 1550nm, and increasing anti-film is to the anti-film of the increasing of optical wavelength 1550nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310239921.9A CN103293604B (en) | 2013-06-18 | 2013-06-18 | Based on the accurate fibre delay line of prism of corner cube and the method for accurate Time delay control |
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| CN201310239921.9A CN103293604B (en) | 2013-06-18 | 2013-06-18 | Based on the accurate fibre delay line of prism of corner cube and the method for accurate Time delay control |
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| CN103293604A CN103293604A (en) | 2013-09-11 |
| CN103293604B true CN103293604B (en) | 2015-11-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108828767A (en) * | 2018-07-23 | 2018-11-16 | 北京图湃影像科技有限公司 | A kind of automatic control optical time delay line apparatus |
| CN109164571A (en) * | 2018-09-27 | 2019-01-08 | 广州永士达医疗科技有限责任公司 | A kind of optical delay line device |
| CN113589436B (en) * | 2021-09-29 | 2022-01-07 | 首都师范大学 | Closed track optical delay module, terahertz system and photoelectric system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762883A (en) * | 2009-12-31 | 2010-06-30 | 浙江大学 | Polarization-independent micro optical fiber variable delay line |
| CN202720386U (en) * | 2012-07-06 | 2013-02-06 | 梁联长 | Fiber delay line with adjustable light |
| CN203337857U (en) * | 2013-06-18 | 2013-12-11 | 中国工程物理研究院流体物理研究所 | A precise fiber delay line based on a pyramid prism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5017959B2 (en) * | 2006-08-14 | 2012-09-05 | 富士通オプティカルコンポーネンツ株式会社 | Polarization-independent optical isolator and optical transceiver |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762883A (en) * | 2009-12-31 | 2010-06-30 | 浙江大学 | Polarization-independent micro optical fiber variable delay line |
| CN202720386U (en) * | 2012-07-06 | 2013-02-06 | 梁联长 | Fiber delay line with adjustable light |
| CN203337857U (en) * | 2013-06-18 | 2013-12-11 | 中国工程物理研究院流体物理研究所 | A precise fiber delay line based on a pyramid prism |
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