CN114185133A - Divergence angle continuously adjustable optical fiber collimator - Google Patents
Divergence angle continuously adjustable optical fiber collimator Download PDFInfo
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- CN114185133A CN114185133A CN202111508190.4A CN202111508190A CN114185133A CN 114185133 A CN114185133 A CN 114185133A CN 202111508190 A CN202111508190 A CN 202111508190A CN 114185133 A CN114185133 A CN 114185133A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 91
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 230000006854 communication Effects 0.000 abstract description 22
- 238000004891 communication Methods 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
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- 230000003044 adaptive effect Effects 0.000 description 1
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- 230000003321 amplification Effects 0.000 description 1
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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
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- 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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
An optical fiber collimator with a continuously adjustable divergence angle relates to space laser communication and solves the problem that the deviation of an emergent beam angle of a traditional focusing mirror group or a multiplying power variable beam expanding mirror system is large in the process of changing the divergence angle. The collimator includes: the device comprises an optical fiber head, a mechanical shell, a fixed optical wedge, a movable optical wedge, a one-dimensional displacement table, a collimating lens group and an adjusting cylinder; the optical fiber head, the fixed optical wedge, the movable optical wedge, the one-dimensional displacement table and the adjusting cylinder are arranged in the mechanical shell, and the collimating lens group is fixed in the adjusting cylinder; the optical fiber head emits laser, and the laser is collimated and emitted by the collimating lens group after passing through the fixed optical wedge and the movable optical wedge; the movable optical wedge is arranged on the one-dimensional displacement table and drives the movable optical wedge to move along the inclined plane direction of the fixed optical wedge, so that the overall thickness of the optical wedge is changed, and the divergence angle of the emergent laser beam is changed; the collimating lens group reciprocates along the optical axis by adjusting the adjusting cylinder, and the distance between the collimating lens group and the optical fiber head is changed.
Description
Technical Field
The invention relates to the field of space laser communication, in particular to an optical fiber collimator with a continuously adjustable divergence angle.
Background
The space laser communication has been applied to various occasions such as satellites, ships, aircrafts, grounds and the like by virtue of the advantages of high communication speed, large communication capacity, high confidentiality, strong anti-interference and anti-interception capabilities and the like, and shows wide development prospects.
In a typical laser communication system, in order to ensure that a link is stable, the divergence angle of signal light is often required to be properly enlarged during design so as to cope with beam degradation caused by a change in the condition of the communication link. This results in a large link redundancy in case of good communication link conditions, which often results in insufficient received optical power in case of large link losses. If the divergence angle of the light beam can be properly adjusted according to the link condition, the divergence angle of the signal light beam can be reduced under the condition of ensuring that the link communication condition is better, so that the optical power of a receiving end is increased, and the communication speed is improved; under the condition of poor communication conditions (such as large platform vibration or strong atmospheric turbulence) the divergence angle can be properly increased to ensure the stable operation of the laser communication terminal.
A relatively mature method for changing the divergence angle of an optical fiber collimator is to adopt a focusing lens group or add a beam expansion system with adjustable amplification factor in front of the collimator. The two need the motor and the guide rail to work in coordination in the adjustment process, and the interval between the lenses is changed, so that the divergence angle of the emergent beam is changed. However, in the moving process of the lens, due to the limited precision of the motor and the guide rail, angular deviation often exists, so that the direction of an emergent light beam is changed, and the deviation angle often reaches the milliradian level through testing. This will seriously damage the parallelism of the receiving and transmitting optical path, reduce the usable range of the receiving visual field, and in serious cases, the communication link cannot be established, resulting in communication failure.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an optical fiber collimator with a continuously adjustable divergence angle, which solves the problems that the traditional focusing lens group or magnification variable beam expanding lens system has large deviation of an emergent light beam angle and large receiving and transmitting parallelism influence in the process of changing the divergence angle.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a fiber collimator with continuously adjustable divergence angle, the collimator comprising: the device comprises an optical fiber head, a mechanical shell, a fixed optical wedge, a movable optical wedge, a one-dimensional displacement table, a collimating lens group and an adjusting cylinder; the optical fiber head, the fixed optical wedge, the movable optical wedge, the one-dimensional displacement table and the adjusting cylinder are arranged in the mechanical shell, and the collimating lens group is fixed in the adjusting cylinder; the optical fiber head emits laser, and the laser is collimated and emitted by the collimating lens group after passing through the fixed optical wedge and the movable optical wedge; the movable optical wedge is arranged on the one-dimensional displacement table and drives the movable optical wedge to move along the inclined plane direction of the fixed optical wedge, so that the overall thickness of the optical wedge is changed, and the divergence angle of the emergent laser beam is changed; and adjusting the adjusting cylinder to enable the collimating lens group to reciprocate along the optical axis, so as to change the distance between the collimating lens group and the optical fiber head.
Preferably, the adjusting cylinder is uniformly provided with threads outside and is in threaded connection with the mechanical shell.
Preferably, the optical wedge device further comprises a bearing support, the movable optical wedge is arranged on the bearing support, and the bearing support is fixed on the one-dimensional displacement table.
Preferably, the inclined planes of the fixed optical wedge and the movable optical wedge are arranged in parallel, and the other planes are arranged in parallel or vertically.
Preferably, the fixed optical wedge and the movable optical wedge have the same projection width of the inclined plane.
Preferably, the material of the fixed optical wedge and the movable optical wedge is glass, and the fixed optical wedge and the movable optical wedge are replaceable.
Preferably, the fiber optic head is located at the optical axis.
Preferably, the collimating lens group includes a first lens, a second lens and a third lens which are coaxially disposed.
The invention has the beneficial effects that: in the double optical wedges, the fixed optical wedge is fixed in position, the relative position of the double optical wedges is changed by horizontally moving the optical wedges, the thickness of the equivalent optical flat plate is changed, the thickness of the equivalent optical flat plate in a Gaussian beam passing area is changed, and the ABCD matrix parameters of the Gaussian beams are changed. Meanwhile, the collimating lens adopts an achromatic design, and the requirements of the assembly and debugging and communication stages on different wave bands are met. The divergence angle is continuously adjustable, the light beam is not interrupted in the process of changing the divergence angle, and meanwhile, the pointing error is kept low. The continuous change of the divergence angles in different ranges can be realized by selecting the double optical wedges made of different materials and with different wedge angles. The minimum divergence angle that the fiber collimator that this patent mentioned can reach is 262.95 mu rad, and the maximum divergence angle is 2.0618mrad, through changing the optical parameter of collimating lens group, its divergence angle adjustment range can carry out individualized design according to actual demand, has satisfied the demand of laser communication system work each stage. The laser communication system is simple in structure and high in reliability, is suitable for being widely applied to the space laser communication system, improves the applicability of the system, and widens the application scene of laser communication. The installation and adjustment are convenient, the cost is low, the requirement on the moving precision of the displacement table is not high, and the large-area popularization and application are facilitated.
Drawings
FIG. 1 is a schematic diagram of an optical fiber collimator device with continuously adjustable divergence angle.
FIG. 2 is a schematic diagram of the movement of an optical wedge pair of the present invention during use.
FIG. 3 is a schematic diagram of the parameters of the Gaussian light of the present invention transmitted to the front surface of the lens via the dual wedges.
FIG. 4 is a graph of wedge optics of the present invention versus specific dimensional parameters.
FIG. 5 is a graph of the divergence angle of the exiting light of the present invention as a function of wedge vs. thickness.
In the figure: 1. the optical fiber device comprises an optical fiber head, 2 a mechanical shell, 3 a bearing support, 4 a fixed optical wedge, 5 a movable optical wedge, 6 a one-dimensional displacement table, 7 a first lens, 8 a second lens, 9 a third lens, 10 and an adjusting cylinder.
Detailed Description
The following describes a fiber collimator with continuously adjustable divergence angle according to the present invention in detail with reference to fig. 1 and the following embodiments. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in FIG. 1, the invention provides an adaptive adjusting mechanism with continuously adjustable divergence angle of emergent light, comprising an optical fiber head 1, a mechanical shell 2, a bearing support 3, a fixed optical wedge 4, a movable optical wedge 5, a one-dimensional displacement table 6, a collimating lens group and an adjusting cylinder 10. The optical fiber head 1 is a single-mode optical fiber pigtail, and the end face of the optical fiber head is required to be smooth and pollution-free. The mechanical shell 2 is used for fixing the fixed optical wedge 4 and the one-dimensional displacement table 6, wherein the fixed optical wedge 4 is fixed in a reserved square hole of the mechanical shell 2 through a fixing screw, the collimating lens group is fixed in the adjusting cylinder 10, and the adjusting cylinder 10 is connected with the mechanical shell 2 through threads. The thread length of the mechanical shell 2 connected with the adjusting cylinder 10 is long enough, and the distance between the collimating lens group and the optical fiber head 1 can be changed by rotating the adjusting cylinder 10 to collimate the emergent light beam. A square hole for the bearing support 3 to go in and out is reserved on the cylinder wall of the mechanical shell 2, and the size of the square hole can accommodate the one-dimensional displacement table 6, so that the bearing support 3 can drive the optical wedge 5 to freely go in and out of the one-dimensional displacement table 6 along the inclined plane direction of the fixed optical wedge 4. The bearing bracket 3 fixes the movable optical wedge 5 on the bearing bracket by gluing, wherein the inclined plane of the movable optical wedge 5 is parallel to the long edge of the bearing bracket 3.
In the use process, as shown in fig. 2 and 3, light with communication signals is emitted through the optical fiber head 1 of the tail fiber, and emitted Gaussian light enters the collimating lens group after being regulated by the fixed optical wedge 4 and the movable optical wedge 5; the collimating lens group can collimate the light from the fixed optical wedge 4 and the movable optical wedge 5, and the collimated Gaussian light is emitted and used for laser communication.
The method is realized by adjusting the divergence angle of emergent light by controlling the thickness of an optical wedge pair consisting of a fixed optical wedge 4 and a movable optical wedge 5, and comprises the following specific steps: the bearing support is controlled to move forwards along the inclined plane direction of the fixed optical wedge 4 on the one-dimensional displacement table 6, two inclined planes between the fixed optical wedge 4 and the movable optical wedge 5 are kept parallel, the thicknesses of the fixed optical wedge 4 and the movable optical wedge 5 are changed along with the movement of the bearing support 3, a small gap between the two optical wedges is ignored, the distance between the small gaps between the two optical wedges is kept unchanged, and the formula of the change of the thickness of the optical wedge pair along with the change of the moving distance of the bearing support 3 is shown as
Δd＝dl×sinα
Where Δ d is the thickness of the wedge pair, dlAlpha is the wedge angle of the optical wedge for the distance of movement of the carrier 3.
The ABCD matrix of the emergent Gaussian light which passes through the double optical wedges and is transmitted to the front surface of the lens is
The physical meaning represented by each parameter is shown in fig. 3, wherein b is the distance from the end face of the optical fiber head 1 to the optical wedge pair, and l is the distance from the end face of the optical fiber head 1 to the collimating lens group. d is the thickness of the wedge pair after ignoring the gap between the wedges, and n is the refractive index at 1550nm of the wedge pair used. This corresponds to the fiber tip 1 being moved forward along the optical axis by a distance of (l-d/n).
In the preferred embodiment, as shown in fig. 1, the widths of the inclined plane projections of the fixed optical wedge 4 and the movable optical wedge 5 are the same. The material used for the fixed wedge 4 and the movable wedge 5 is H-FK95N glass from Dougeny, which has a refractive index of 1.4291441 at a wavelength of 1550nm and a wedge angle of 5 DEG, and the specific dimensional parameters are shown in FIG. 4.
The parameters of the collimating lens group in the preferred embodiment are shown in table 1 below. The collimating lens group is subjected to 632.8nm and 1550nm achromatic design, and the requirements on different wave bands in the installation, adjustment and communication processes are met.
TABLE 1 parameters of collimating lens groups
In the preferred embodiment, the waist of the gaussian light emitted from the optical fiber head 1 is on the end face of the optical fiber head 1, and the radius of the waist is 5 μm, so that the divergence angle of the emitted gaussian light passing through the lens group will change, and the divergence angle changes with the thickness of the optical wedge pair/the moving distance of the mechanism as shown in fig. 5, it can be seen that the divergence angle of the emitted gaussian light changes approximately linearly with the change of the thickness of the optical wedge pair, and the minimum divergence angle that can be achieved is 262.95 μ rad, and the maximum divergence angle is 2.0618 mrad.
Claims (8)
1. A fiber collimator with continuously adjustable divergence angle, comprising: the device comprises an optical fiber head, a mechanical shell, a fixed optical wedge, a movable optical wedge, a one-dimensional displacement table, a collimating lens group and an adjusting cylinder; the optical fiber head, the fixed optical wedge, the movable optical wedge, the one-dimensional displacement table and the adjusting cylinder are arranged in the mechanical shell, and the collimating lens group is fixed in the adjusting cylinder; the optical fiber head emits laser, and the laser is collimated and emitted by the collimating lens group after passing through the fixed optical wedge and the movable optical wedge; the movable optical wedge is arranged on the one-dimensional displacement table and drives the movable optical wedge to move along the inclined plane direction of the fixed optical wedge, so that the overall thickness of the optical wedge is changed, and the divergence angle of the emergent laser beam is changed; and adjusting the adjusting cylinder to enable the collimating lens group to reciprocate along the optical axis, so as to change the distance between the collimating lens group and the optical fiber head.
2. The fiber collimator of claim 1, wherein the adjusting cylinder is threaded to the machine housing.
3. The optical fiber collimator with the continuously adjustable divergence angle as claimed in claim 1, further comprising a supporting bracket, wherein the movable optical wedge is disposed on the supporting bracket, and the supporting bracket is fixed on the one-dimensional displacement table.
4. The optical fiber collimator with continuously adjustable divergence angle as claimed in claim 1, wherein the inclined planes of the fixed wedge and the movable wedge are disposed in parallel, and the other planes are disposed in parallel or perpendicular.
5. The optical fiber collimator with continuously adjustable divergence angle as claimed in claim 4, wherein the widths of the inclined plane projections of the fixed wedge and the movable wedge are the same.
6. The optical fiber collimator with continuously adjustable divergence angle as claimed in claim 1, wherein the material of the fixed wedge and the movable wedge is glass and can be replaced.
7. A fiber collimator with continuously adjustable divergence angle according to claim 1, wherein the fiber head is located at the optical axis.
8. The fiber collimator of claim 1, wherein the collimating lens group comprises a first lens, a second lens and a third lens coaxially disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111508190.4A CN114185133A (en) | 2021-12-10 | 2021-12-10 | Divergence angle continuously adjustable optical fiber collimator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111508190.4A CN114185133A (en) | 2021-12-10 | 2021-12-10 | Divergence angle continuously adjustable optical fiber collimator |
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| CN114185133A true CN114185133A (en) | 2022-03-15 |
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| CN202111508190.4A Pending CN114185133A (en) | 2021-12-10 | 2021-12-10 | Divergence angle continuously adjustable optical fiber collimator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016130A (en) * | 2022-06-22 | 2022-09-06 | 中国科学院福建物质结构研究所 | Light spot adjusting optical system and printing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890343A (en) * | 2012-09-18 | 2013-01-23 | 中国科学院上海光学精密机械研究所 | Method for regulating output light beam of zooming system with optical wedge pair |
| CN204086693U (en) * | 2014-09-18 | 2015-01-07 | 光越科技(深圳)有限公司 | The high-power adjustable spot delivery of one class |
| CN211402828U (en) * | 2020-01-10 | 2020-09-01 | 杰讯光电(福建)有限公司 | Optical fiber collimator |
| CN214201835U (en) * | 2021-02-27 | 2021-09-14 | 北京工业大学 | High-power collimator for various optical fiber jumpers |
-
2021
- 2021-12-10 CN CN202111508190.4A patent/CN114185133A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890343A (en) * | 2012-09-18 | 2013-01-23 | 中国科学院上海光学精密机械研究所 | Method for regulating output light beam of zooming system with optical wedge pair |
| CN204086693U (en) * | 2014-09-18 | 2015-01-07 | 光越科技(深圳)有限公司 | The high-power adjustable spot delivery of one class |
| CN211402828U (en) * | 2020-01-10 | 2020-09-01 | 杰讯光电(福建)有限公司 | Optical fiber collimator |
| CN214201835U (en) * | 2021-02-27 | 2021-09-14 | 北京工业大学 | High-power collimator for various optical fiber jumpers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016130A (en) * | 2022-06-22 | 2022-09-06 | 中国科学院福建物质结构研究所 | Light spot adjusting optical system and printing method thereof |
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