CN107346050A - A kind of compact optical delayer - Google Patents
A kind of compact optical delayer Download PDFInfo
- Publication number
- CN107346050A CN107346050A CN201710637492.9A CN201710637492A CN107346050A CN 107346050 A CN107346050 A CN 107346050A CN 201710637492 A CN201710637492 A CN 201710637492A CN 107346050 A CN107346050 A CN 107346050A
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- China
- Prior art keywords
- optical
- light
- cat
- roof prism
- prism
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/34—Optical coupling means utilising prism or grating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
Abstract
The invention discloses a kind of compact optical delayer, including shell, one end of the shell is connected with double-fiber collimator, the inside of shell is provided with cat's eye reflex device close to tail position, gap is remained between the cat's eye reflex device and double-fiber collimator, the inside of the shell is provided with roof prism, roof prism is distributed in the input and output light path between cat's eye reflex device and double-fiber collimator, the other end of the shell is provided with motor, clamper is connected between motor and cat's eye reflex device, this compact optical delayer, by installing cat's eye reflex device, so that whole delayer is compacter, volume is significantly smaller than traditional adjustable delay device, motor and cat's eye reflex device are connected by clamper, the convenient reflection position to cat's eye reflex device is adjusted, it ensure that the reasonability of design.
Description
Technical field
The present invention relates to optical delay technical field, specially a kind of compact optical delayer.
Background technology
Optical delay (also known as optical delay line) is the device that desired optical delay is produced in the propagation of light, and can
To be operable to adjust the signal optical path delay in light, optical delay line can be used in various applications, including optical communication equipment
Or module, optical sensor device or system, or other optical instruments, for example, with for reference beam and sample beam
Optical coherence tomography (OCT) system of two interference light arms, one or more optical delay devices can be used, to cause
Different opposing optical retardations between optical reference light and sampled light；
It is that the light for needing to postpone is introduced and exported using two optical fiber collimators to postpone mostly in traditional light delay device
Device, due to the limitation of optical fiber collimator volume so that whole optical delay devices can not be made smaller, although going out in the market
Showing double-fiber collimator, it is possible to achieve a collimater volume produces the input and output of light simultaneously, but due to double optical fiber
The input of collimater and output light are influenceed by collimation lens, can produce an angle of cut, and this is allowed in traditional delay device
Speculum be difficult to realize the reception of light and be reflected back collimater, so that the double-fiber collimator of small volume can not be prolonged in light
Applied in slow device, and then limit the diminution of the volume of deferred mount.
The content of the invention
The technical problem to be solved in the present invention is to overcome the defects of existing, there is provided a kind of compact optical delayer, can
The miniaturization of optical delay is realized, effectively can be solved the problems, such as in background technology.
To achieve the above object, the present invention provides following technical scheme：A kind of compact optical delayer, including shell,
One end of the shell is connected with double-fiber collimator, and the inside of shell is provided with optical reflector close to tail position, described
Gap is remained between optical reflector and double-fiber collimator, the inside of the shell is provided with roof prism, roof prism
It is distributed in the input and output light path between optical reflector and double-fiber collimator.
As a preferred technical solution of the present invention, the roof prism by from prism material refractive index n,
With the long side angles such as two of design roof prism so that the light from optical fiber collimator passes through the propagation side after roof prism
To the optical propagation direction that roof prism is reached with being reflected from reflector is parallel.
As a preferred technical solution of the present invention, the optical reflector positioner, for causing the optics
Reflector is relatively moved relative to the double-fiber collimator and the roof prism, to change prolonging for the output beam
Chi Liang.
As a preferred technical solution of the present invention, the positioner includes to move the optical reflector
To the motor of appropriate location, and connection motor and the clamper of optical reflector.
As a preferred technical solution of the present invention, the positioner includes manually operated device, to pass through people
Manually operated make optical reflector movement in place instead of motor.
As a preferred technical solution of the present invention, the optical reflector is prism of corner cube, to by the input
The reflection of light beam, to produce the output beam.
As a preferred technical solution of the present invention, the optical reflector is cat's eye reflex device, to will be described defeated
Enter the reflection of light beam, to produce the output beam.
As a preferred technical solution of the present invention, the cat's eye reflex device is that a side is spherical convex lens, separately
Side is concave spherical mirror, receives the input light from roof prism by spherical convex lens, then pass through concave spherical mirror
Reflect light back into convex lens.
As a preferred technical solution of the present invention, the cat's eye reflex device is a transparent cylinder overall processing,
Convex spherical, and a sphere anti-reflection film wherein are processed into two end faces of cylinder, are allowed to form the convex lens by light；It is another
Individual sphere plating total reflection film, form the reflection concave spherical surface for carrying out light to cylinder inside.
As a preferred technical solution of the present invention, the optical parametric of cat's eye reflex device meets equation below：R1=(n-
1)r2；
L=r1+r2；
Wherein：
R1 is concave spherical mirror sphere curvature radius；
R2 is spherical convex lens sphere curvature radius；
L is distance of the spherical convex lens summit to concave spherical mirror summit；
N is the refractive index of two kinds of lens materials.
Compared with prior art, the beneficial effects of the invention are as follows：Book compact optical delayer, it is anti-by installing opal
Emitter so that whole delayer is compacter, and volume is significantly smaller than traditional adjustable delay device, and motor is connected by clamper
With cat's eye reflex device, the convenient reflection position to cat's eye reflex device is adjusted, and ensure that the reasonability of design.
Brief description of the drawings
Fig. 1 is traditional fiber adjustable delay device fundamental diagram；
Fig. 2 is another example fundamental diagram of prior art optical delay line；
Fig. 3 is the first of the compact optical fiber variable delay device of use double optical fiber collimators, roof prism and prism of corner cube
Implement illustration；
Fig. 4 is the first of the compact optical fiber variable delay device of use double optical fiber collimators, roof prism and prism of corner cube
The basic mechanical schematic diagram of embodiment；
Fig. 5 A be using double optical fiber collimators, roof prism and cat's eye reflex device compact optical fiber variable delay device the
The optical arrangement figure of two embodiments；
Fig. 5 B are cat's eye reflex device schematic diagram；
Fig. 6 is to use double optical fiber collimator, roof prism and cat's eye reflex devices, and with the addition of the compact of basic mechanical structure
The second embodiment figure of type optical fibre variable delayer.
In figure：1 shell, 2 clampers, 3 cat's eye reflex devices, 4 motors, 5 roof prisms, 6 double-fiber collimators, 7 pyramid ribs
Mirror, 8 prism of corner cube brackets, 9 leading screws, 10 optical fiber collimators.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1 is an example of the optical delay line of prior art, and wherein optical fiber collimator 10 is by from the first optical fiber
Input optical signal is collimated into inputs light beam, and then beam propagation certain distance incides the reflector of prism of corner cube 7, then reflected light
Beam is propagated back to optical fiber collimator 10, and focuses the light into the second optical fiber, when direction of the reflector along light beam translates, can adjust
The optical path length of the reflected beams is saved, as the distance d of retroeflector adjustment, then optical path length variation is 2d.
Fig. 2 further illustrates another example of the optical delay line of prior art, has wherein guiding screw mandrel 9 is connected to
The prism of corner cube bracket 8 of screw thread, for converting rotational motion to the linear motion for prism of corner cube 7, it can use manual
Knob or motor carry out the rotation for prism of corner cube 7, to change optical path length, can also use other motions, such as
Using linear magnetic motor or linear piezoelectric motor come the linear motion for the reflector of prism of corner cube 7.
It is can be seen that from Fig. 1 and Fig. 2 due to using two optical fiber collimators 10, two collimaters are needed between keeping certain
Every thus delay line is relatively large sized, for some applications, especially for needing to use those of multiple delay lines should
With, such as Phased Array Radar System, then need greater compactness of optical delay line.
Fig. 3 is included (Fig. 3 A and 3B) and shows the compact optics based on the optical reflector being used as using prism of corner cube 7
First example of delay line, as shown in Figure 3A, in this example using double-fiber collimator 6, to provide the light delay of compact
The input and output port of line, the double-fiber collimator 6 in example shown include being used to keep two optical fiber closely placed to make
For the metal sleeve of input optical fibre light path (for example, upper fiber light path) and output optical fibre light path (for example, bottom optic fibre light path),
And it is placed on side input light of the reception from input optical fibre circuit of the terminal of input and output optical fibre light path and will exports
Light is directed to the collimation lens in output optical fibre circuit, and as shown in Figure 3A, the reflector of prism of corner cube 7 is used for receiving from input
The inputs light beam of optical fiber and roof prism 5, light beam is then reflected back roof prism 5, finally returns back to double-fiber collimator 6；
More specifically, the end face of input and output optical fibre is placed at or near the focal plane of lens, if two light
Beam is input to collimation lens from two optical fiber, and by producing two collimated light beams after lens, two collimated light beams will be formed
Two directions of propagation of the angle of the crossing；
As shown in Figure 3A, when using some commercially available double optical fiber collimators, the interval between two light beams is generally about
1mm, although the spacing between focal length or two fibre tips that can be by changing lens, beam crosses angle also has about 3.7
Degree；
As shown in Figure 3A, in the light path of two light beams, roof prism 5 is placed between collimation lens and prism of corner cube 7, is made
Must be from double-fiber collimator 6 towards the light beam in the direction of prism of corner cube 7 and the reflected beams from prism of corner cube 7 and towards double light
The light beam of fine collimater 6 can be with parallel to each other；
For example, roof prism 5 can be made up of BK-7 glass, refractive index n is 1.5, and roof angle is 3.7 degree, so that two
The angle of cut is 3.7 degree of light beam parallelization, such as Fig. 3 B；
Generally, ridge angle can determine that the collimation lens in double optical fiber collimators will be from angle with formula β=α/[2 (n-1)]
The light that cone prism 7 reflects is focused in output optical fibre facet；
Compact adjustable optical delay line in Fig. 3 A can be along light beam by using actuator (such as motor 4)
The position of the direction movement reflector of prism of corner cube 7 of propagation carries out delay regulation, by the way that prism of corner cube 7 to be moved to different positions
Different optical path delay can be obtained by putting；
As shown in Figure 3A, can use the place apparatus part of device housings 1, including the actuator of mobile prism of corner cube 7 or
Motor 4.
Fig. 4 shows the more details of Fig. 3 A compact optical fiber delayers, and prism of corner cube 7 is fixed to the threaded folder of tool
Holder 2, move back and forth prism of corner cube 7 by turning through the screw rod of guiding screw thread of clamper, knob or motor 4 can be used
Carry out the rotary motion for prism of corner cube 7, other Motion-generating mechanisms can also be used, such as use linear magnetic motor or line
Property piezo-electric motor carrys out the linear motion for the reflector of prism of corner cube 7.
Fig. 5 A and 5B show another example of compact optical delay line, and Fig. 5 A are shown using double optical fiber collimators,
The optical arrangement of roof prism 5 and cat's eye reflex device 3, similar to shown in Fig. 3 A and Fig. 4, phase is designed with other optical delay lines
Than 5A and 5B sizes can be obviously reduced；
Fig. 5 B show the structure of the cat's eye reflex device 3 used in Fig. 5 A, and cat's eye reflex device 3 has two spheres, curvature
Radius r1, r2 and length L meet following relation：R1=(n-1) r2, L=r1+r2, wherein n are the refractive indexes of reflector material,
The rear surface of cat's eye reflex device 3 is coated with high reflection material, such as silver, gold, aluminium or multilayer dielectric film；
Fig. 6 shows Fig. 5 A using double optical fiber collimators, and the compact optical fiber of roof prism 5 and cat's eye reflex device 3 is variable
The more details of delay line, including shell 1, one end of shell 1 are connected with double-fiber collimator 6, and it is defeated that the collimater includes reception
Enter the input optical fibre of light beam, for the light received is introduced into deferred mount, the collimater also includes output optical fibre, for that will prolong
The light of slow device exports from deferred mount, and the collimater also includes collimation lens, is placed on the side of input and output optical fibre
End face, to receive the inputs light beam from input optical fibre, and the output beam inside future self-dalay device is output to output light
It is fine；
The inside of shell 1 is provided with cat's eye reflex device 3 close to tail position, cat's eye reflex device 3 and double-fiber collimator 6 it
Between remain with gap, cat's eye reflex device 3 is used for receiving the inputs light beam for passing through collimation lens from input optical fibre, and this is inputted
Light beam is reflected as output beam by collimation lens to output optical fibre, and cat's eye reflex device 3 is that a side is that sphere is convex
Lens, opposite side are concave spherical mirrors, receive the input light from roof prism 5 by spherical convex lens, then pass through recessed ball
Face speculum reflects light back into convex lens, and the optical parametric of cat's eye reflex device 3 meets equation below：
R1=(n-1) r2；
L=r1+r2；
Wherein：
R1 is concave spherical mirror sphere curvature radius；
R2 is spherical convex lens sphere curvature radius；
L is distance of the spherical convex lens summit to concave spherical mirror summit；
N is the refractive index of two kinds of lens materials；
Light reaction device can be 3 two kinds of forms of prism of corner cube 7 and cat's eye reflex device, and cat's eye reflex device 3 is a transparent circle
Cylinder overall processing forms, and convex spherical is processed into two end faces of cylinder, and a sphere is provided with anti-reflection film wherein, is allowed to shape
Into the convex lens by light, another sphere is coated with total reflection film, forms the reflection concave spherical surface for passing through light to cylinder inside；
The inside of shell 1 is provided with roof prism 5, and roof prism 5 is distributed in cat's eye reflex device 3 and double-fiber collimator 6
Between input and output light path in, for receiving the input light from double-fiber collimator 6 and being transmitted to reflector, and by receiving
Reflected light from reflective optical system is transmitted to double-fiber collimator 6, roof prism 5 by the refractive index n of the material from prism, if
Count the long side angles such as two of roof prism 5 so that the light from optical fiber collimator 10 passes through the propagation side after roof prism 5
To the optical propagation direction that roof prism 5 is reached with being reflected from reflector is parallel；
The other end of shell 1 is provided with motor 4, and clamper 2, clamper 2 are connected between motor 4 and cat's eye reflex device 3
For making optical reflector be relatively moved relative to double-fiber collimator 6 and roof prism 5, to change prolonging for output beam
Chi Liang, the output shaft of motor 4, can will by driving clamper 2 to move so that optical reflector is moved to appropriate position
Motor 4 replaces with knob, to make optical reflector movement in place instead of motor 4 by the manually operated of people.
The present invention by installing cat's eye reflex device 3, using double-fiber collimator and roof prism so that whole delayer is more
Step up to gather, volume is significantly smaller than traditional adjustable delay device, and motor 4 and cat's eye reflex device 3 are connected by clamper 2, convenient
The reflection position of cat's eye reflex device 3 is adjusted, ensure that the reasonability of design.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of compact optical delayer, including shell (1), it is characterised in that：One end of the shell (1) is connected with double light
Fine collimater (6), the inside of shell (1) are provided with optical reflector (3) close to tail position, the optical reflector (3) with
Gap is remained between double-fiber collimator (6), the inside of the shell (1) is provided with roof prism (5), roof prism (5)
It is distributed in the input and output light path between optical reflector (3) and double-fiber collimator (6).
A kind of 2. compact optical delayer according to claim 1, it is characterised in that：The roof prism (5) passes through
From the refractive index n of the material of prism, and the long side angles such as two of design roof prism (5) so that from optical fiber collimator
(10) light is by the direction of propagation after roof prism (5), the light with reflecting arrival roof prism (5) from reflector (3)
The direction of propagation is parallel.
A kind of 3. compact optical delayer according to claim 1, it is characterised in that：Also include an optical reflector
(3) positioner, for causing the optical reflector (3) relative to the double-fiber collimator (10) and the roof prism
(5) relatively moved, to change the retardation of the output beam.
A kind of 4. compact optical delayer according to claim 3, it is characterised in that：The positioner includes can be with
The optical reflector (3) is set to be moved to the motor (4) of appropriate location, and connection motor and the clamper (2) of optical reflector.
A kind of 5. compact optical delayer according to claim 3, it is characterised in that：The positioner includes manual
The device of operation, to replace motor (4) to make the optical reflector (3) mobile in place by the manually operated of people.
A kind of 6. compact optical delayer according to claim 1, it is characterised in that：The optical reflector (3) is
Prism of corner cube (7), to by the reflection of the inputs light beam, to produce the output beam.
A kind of 7. compact optical delayer according to claim 1, it is characterised in that：The optical reflector (3) is
Cat's eye reflex device (3), the inputs light beam to be reflected, to produce the output beam.
A kind of 8. compact optical delayer according to claim 7, it is characterised in that：The cat's eye reflex device (3) is
One side is spherical convex lens, and opposite side is concave spherical mirror, is received by spherical convex lens from roof prism (5)
Input light, then convex lens are reflected light back into by concave spherical mirror.
A kind of 9. compact optical delayer according to claim 8, it is characterised in that：The cat's eye reflex device (3) is
One transparent cylinder overall processing, two end faces of cylinder are processed into convex spherical, and a sphere anti-reflection film wherein, are allowed to
Form the convex lens by light；Another sphere plating total reflection film, form the reflection concave spherical surface for carrying out light to cylinder inside.
A kind of 10. compact optical delayer according to claim 9, it is characterised in that：The optics of cat's eye reflex device (3)
Parameter meets equation below：R1=(n-1) r2；
L=r1+r2；
Wherein：
R1 is concave spherical mirror sphere curvature radius；
R2 is spherical convex lens sphere curvature radius；
L is distance of the spherical convex lens summit to concave spherical mirror summit；
N is the refractive index of two kinds of lens materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637492.9A CN107346050A (en) | 2017-07-31 | 2017-07-31 | A kind of compact optical delayer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637492.9A CN107346050A (en) | 2017-07-31 | 2017-07-31 | A kind of compact optical delayer |
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| CN107346050A true CN107346050A (en) | 2017-11-14 |
Family
ID=60258163
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| CN201710637492.9A Pending CN107346050A (en) | 2017-07-31 | 2017-07-31 | A kind of compact optical delayer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020047898A1 (en) * | 2018-09-05 | 2020-03-12 | 广州永士达医疗科技有限责任公司 | Frequency-sweeping galvanometer oct system |
| CN112545453A (en) * | 2019-09-26 | 2021-03-26 | 上海科技大学 | Probe of handheld photoacoustic imaging device |
| CN113614617A (en) * | 2019-03-06 | 2021-11-05 | 康拉德有限责任公司 | Collimator |
| CN113900188A (en) * | 2021-10-15 | 2022-01-07 | 中国电子科技集团公司第三十四研究所 | All-optical fiber delay device |
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|---|---|---|---|---|
| WO2020047898A1 (en) * | 2018-09-05 | 2020-03-12 | 广州永士达医疗科技有限责任公司 | Frequency-sweeping galvanometer oct system |
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