CN214067437U - Optical circulator integrating beam expanding function - Google Patents
Optical circulator integrating beam expanding function Download PDFInfo
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- CN214067437U CN214067437U CN202023137525.XU CN202023137525U CN214067437U CN 214067437 U CN214067437 U CN 214067437U CN 202023137525 U CN202023137525 U CN 202023137525U CN 214067437 U CN214067437 U CN 214067437U
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- wave plate
- optical circulator
- faraday rotator
- birefringent crystal
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Abstract
The utility model provides an integrated optical circulator who expands beam function, include the double-fiber collimator, first birefringence crystal, first half wave plate group, first faraday rotator, second birefringence crystal, second faraday rotator, second half wave plate group, third birefringence crystal, negative lens group and the positive lens group that arrange in proper order along the light path direction, the periphery of first faraday rotator and second faraday rotator is provided with the magnet. Through the negative lens group and the positive lens group arranged in free space as the beam expanding output of the second port, the fusion splicing and coiling of optical fibers are reduced, the operation difficulty and the occupied area of coiled fibers can be reduced, the volume of the overall device can be reduced, and the assembly is convenient.
Description
Technical Field
The utility model relates to an optical device field especially relates to an integrated optical circulator who expands beam function.
Background
The optical circulator uses the nonreciprocal characteristic of light propagating in the magneto-optical crystal to complete the directional propagation of multi-port input and output, and has the function of enabling optical signals to be transmitted only along a specified port sequence. When an optical signal is input from a designated port, the optical signal can be output only along a predetermined port in the device. When the transmission sequence of the optical signals is changed, namely the optical signals are not transmitted according to the appointed ports, the loss is large, and the isolation of the signals can be realized.
General circulator has three port, under some application scenarios, need expand the beam output at the second port, so pass through the fused fiber splice connection beam expanding system in second port department, realize expanding beam output then to and the transmission and the receiving function of communication, nevertheless owing to the butt fusion that needs optic fibre, can increase the total volume of device, and need coil optic fibre, increased the operation degree of difficulty, also can influence stability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an integrated beam expanding function is in order to realize small-size optical circulator who integrates.
In order to realize the purpose of the utility model, the utility model provides an integrated optical circulator that expands beam function, including the double fiber collimator, the first birefringent crystal, the first half wave plate group, the first Faraday rotator, the second birefringent crystal, the second Faraday rotator, the second half wave plate group, the third birefringent crystal, the negative lens group and the positive lens group that are arranged along the light path direction in proper order; magnets are provided on the outer peripheries of the first and second Faraday rotators.
It can be seen by above-mentioned scheme that, the first port and the third port of double fiber collimator as the optical circulator, and the combination through negative lens group and positive lens group uses as the second port, can realize the function of optical circulator through setting gradually of above-mentioned device, and set up negative lens group and positive lens group in second port department, negative lens group is used for expanding the beam with the parallel light of third birefringent crystal outgoing, the output of rethread positive lens group has the parallel light of great facula diameter, then saved the expensive double clad optic fibre that generally sets up at the second port, avoid the problem that the facula quality that double clad optic fibre brought descends simultaneously, negative lens group and positive lens group through the free space arrangement of present case, the butt fusion and the coiling of optic fibre have been reduced, can reduce the operation degree of difficulty and dish fibre area occupied, can reduce overall device volume, convenient assembly.
According to a further scheme, the optical circulator further comprises a fixing tube, the fixing tube is provided with a mounting hole in a penetrating mode along the axial direction, and the double-optical-fiber collimator, the first birefringent crystal, the first half-wave plate group, the first Faraday rotator, the second birefringent crystal, the second Faraday rotator, the second half-wave plate group and the third birefringent crystal are all arranged in the mounting hole.
In a further aspect, the negative lens group is disposed within the mounting hole.
In a further aspect, the positive lens group is disposed in the mounting hole.
In a further proposal, the magnet is arranged in a magnetic ring shape and is sleeved outside the fixed pipe.
The first half-wave plate group comprises a first half-wave plate and a second half-wave plate, an included angle of optical axes of the first half-wave plate and the second half-wave plate is set to be 45 degrees, and the first half-wave plate and the second half-wave plate are arranged along the radial direction of the fixed tube; the second half-wave plate group comprises a third half-wave plate and a fourth half-wave plate, an included angle of optical axes of the third half-wave plate and the fourth half-wave plate is set to be 45 degrees, and the third half-wave plate and the fourth half-wave plate are arranged along the radial direction of the fixed tube.
According to a further scheme, the optical circulator further comprises an arc-shaped plate arranged in the fixed pipe, the arc-shaped plate comprises an arc-shaped bottom surface and a mounting plane, the arc-shaped bottom surface is mounted on the arc-shaped inner wall of the fixed pipe, and the first birefringent crystal, the first half wave plate group, the first Faraday rotator, the second birefringent crystal, the second Faraday rotator, the second half wave plate group and the third birefringent crystal are mounted on the mounting plane.
It is from top to bottom visible, can conveniently assemble the device through fixed pipe and arc to and improve the stability after the assembly, in addition, negative lens group and positive lens group can assemble selectively the fixed intraductal according to actual demand, can have bigger facula outside the fixed pipe, and then can have higher integrated level in the fixed pipe, are favorable to further miniaturization.
In a further aspect, the dual fiber collimator includes a single mode fiber, a multi mode fiber, a capillary tube and a lens, the single mode fiber and the multi mode fiber being inserted in parallel into the capillary tube.
Still further, the negative lens group includes at least one concave lens, biconcave lens, plano-concave lens, or negative meniscus lens.
Still further, the positive lens group includes at least one of a convex lens, a biconvex lens, a plano-convex lens, or a positive meniscus lens.
From the above, the negative lens group and the positive lens group have various options in arrangement, and in practical application, one, two or more combinations can be performed according to different application scenes.
Drawings
Fig. 1 is a structural diagram of an embodiment of the optical circulator of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
Referring to fig. 1, the optical circulator with integrated beam expanding function of the present application includes a dual-fiber collimator 1, a first birefringent crystal 31, a first half-wave plate set 321, a first faraday rotator 331, a second birefringent crystal 34, a second faraday rotator 332, a second half-wave plate set 322, a third birefringent crystal 37, a negative lens set, and a positive lens set, which are sequentially arranged along an optical path direction.
The optical circulator further comprises a fixed pipe 39 and an arc-shaped plate 38, the fixed pipe 39 penetrates through the installation hole along the axial direction, the arc-shaped plate 38 is arranged in the fixed pipe 39, the arc-shaped plate 38 comprises an arc-shaped bottom surface and an installation plane, the arc-shaped bottom surface is installed on the arc-shaped inner wall of the fixed pipe 39, and the first birefringent crystal 31, the first half-wave plate set 321, the first faraday rotator 331, the second birefringent crystal 34, the second faraday rotator 332, the second half-wave plate set 322 and the third birefringent crystal 37 are all located in the installation hole and installed on the installation plane.
The dual optical fiber collimator 1 includes a single mode optical fiber 11, a multi mode optical fiber 12, a capillary 13 and a lens 14, the single mode optical fiber 11 and the multi mode optical fiber 12 are inserted in parallel into the capillary 13, the capillary 13 and the lens 14 are opposite in inclined plane, and the output end of the lens 14 faces the first birefringent crystal 31. The dual fiber collimator 1 is located at a first axial end of the fixed tube 39, the single mode fiber 11 is used as the first port P1, and the multimode fiber 12 is used as the third port P2.
The first half-wave plate group 321 includes a first half-wave plate and a second half-wave plate, an included angle between optical axes of the first half-wave plate and the second half-wave plate is 45 °, the first half-wave plate and the second half-wave plate are radially attached to an end face of the first birefringent crystal 31 along the fixed tube 39, and the first half-wave plate and the second half-wave plate respectively occupy half of the end face of the first birefringent crystal 31.
The second half wave plate group 322 includes a third half wave plate and a fourth half wave plate, the optical axis included angle of the third half wave plate and the fourth half wave plate is set at 45 °, the third half wave plate and the fourth half wave plate are arranged along the radial direction of the fixed tube 39 and attached to the end face of the second birefringent crystal 34, and the third half wave plate and the fourth half wave plate each occupy half of the end face of the second birefringent crystal 34.
The second birefringent crystal 34 is abutted between the first faraday rotator 331 and the second faraday rotator 332, the magnet 35 is disposed in a magnetic ring, the magnet 35 is sleeved outside the fixed tube 39, and the magnet 35 is disposed at the periphery of the first faraday rotator 331 and the second faraday rotator 332, so as to provide a magnetic field for the two faraday rotators, thereby realizing magneto-rotation.
The beam expanding device formed by combining the negative lens group and the positive lens group is arranged at the second axial end of the fixed tube 39, the negative lens group comprises at least one concave lens, double concave lens, plano-concave lens or negative meniscus lens, the positive lens group comprises at least one convex lens, double convex lens, plano-convex lens or positive meniscus lens, and in actual use, type selection, quantity selection and matching of related light paths can be carried out according to requirements.
In the present embodiment, the negative lens group includes the biconcave lens 21, the positive lens group includes the biconvex lens 22, and both the biconcave lens 21 and the biconvex lens 22 are disposed in the mounting hole of the fixed tube 39.
When the signal light output from the first port P1 is directed to the second port P2, after being output from the lens 14, collimated parallel light in the horizontal direction is formed, the collimated parallel light passes through the birefringent crystal 31, because of the different refractive indexes of the o light and the e light in the YV04 birefringent crystal, the o light and the e light are split into two parallel lights with polarization states perpendicular to each other, the two lights respectively pass through the half-wave plates with different optical axis orientations in the first half-wave plate set 104, the polarization directions of the o light and the e light are rotated around the optical axes of the half-wave plates respectively passing through, one of the two half-wave plates is rotated by 45 degrees clockwise, the other is rotated by 45 degrees counterclockwise, the polarization states of the o light and the e light are changed from perpendicular to parallel, then pass through the first faraday rotator 331, the polarization direction is rotated by 45 degrees, the polarization directions of the two light are both changed into the horizontal direction, then pass through the second birefringent crystal 107, at this time, the two parallel light beams are relative to the optical axis of the second birefringent crystal, its direction of propagation does not change, pass through second Faraday rotator 332 again, the polarization direction is rotatory 45 degrees, two bundles of light rethread second half wave plates that the optical axis orientation in half wave plate group 322 is different respectively, two bundles of parallel light polarization directions are rotatory around the optical axis of the half wave plate that passes through separately, one of them turns 45 degrees clockwise, another anticlockwise turns 45 degrees, the polarization direction mutually perpendicular of two bundles of light, parallel incident o light and e light pass through third birefringent crystal 110 after, assemble into a bundle of horizontal direction's parallel light beam, parallel light beam passes through biconcave lens 21 earlier and expands the beam, pass through biconvex lens 22 collimation after expanding the beam and export from second port P2.
The signal light returned from the second port P2 passes through the double convex lens 22, the double concave lens 21, the third birefringent crystal 37, the second half wave plate group 322, the second faraday rotator 332, the second birefringent crystal 34, the first faraday rotator 331, the first half wave plate group 321, and the first birefringent crystal 31 in this order, passes through the deviation of the optical path, is coupled into the multimode optical fiber 12, and is output from the third port P3.
It is from top to bottom visible, first port and the third port of double fiber collimator conduct light circulator, and the combination through negative lens group and positive lens group uses as the second port, can realize light circulator's function through setting gradually of above-mentioned device, and set up negative lens group and positive lens group in second port department, negative lens group is used for expanding the parallel light beam of third birefringent crystal outgoing, the output of rethread positive lens group has the parallel light of great facula diameter, then generally saved the expensive double-clad optic fibre that sets up at the second port, avoid the problem that the facula quality that double-clad optic fibre brought descends simultaneously, negative lens group and the positive lens group through the free space arrangement of present case, the butt fusion and the coiling of optic fibre have been reduced, can reduce the operation degree of difficulty and dish fibre area occupied, can reduce overall device volume, convenient assembly.
Claims (10)
1. An optical circulator integrated with a beam expanding function is characterized by comprising a double-fiber collimator, a first birefringent crystal, a first half-wave plate group, a first Faraday rotator, a second birefringent crystal, a second Faraday rotator, a second half-wave plate group, a third birefringent crystal, a negative lens group and a positive lens group which are sequentially arranged along the direction of an optical path;
and magnets are arranged on the peripheries of the first Faraday rotator and the second Faraday rotator.
2. An optical circulator as claimed in claim 1, wherein:
the optical circulator further comprises a fixing pipe, the fixing pipe penetrates through the mounting hole along the axial direction, and the double-optical-fiber collimator, the first birefringent crystal, the first half-wave plate group, the first Faraday rotator, the second birefringent crystal, the second Faraday rotator, the second half-wave plate group and the third birefringent crystal are all arranged in the mounting hole.
3. An optical circulator as claimed in claim 2, wherein:
the negative lens group is arranged in the mounting hole.
4. An optical circulator as claimed in claim 3, wherein:
the positive lens group is arranged in the mounting hole.
5. An optical circulator as claimed in claim 2, wherein:
the magnet is arranged in a magnetic ring mode, and the magnet is sleeved outside the fixed pipe.
6. An optical circulator as claimed in claim 2, wherein:
the first half-wave plate set comprises a first half-wave plate and a second half-wave plate, an included angle between optical axes of the first half-wave plate and the second half-wave plate is set to be 45 degrees, and the first half-wave plate and the second half-wave plate are arranged along the radial direction of the fixed tube;
the second half wave plate group comprises a third half wave plate and a fourth half wave plate, an included angle of optical axes of the third half wave plate and the fourth half wave plate is set to be 45 degrees, and the third half wave plate and the fourth half wave plate are arranged along the radial direction of the fixed tube.
7. An optical circulator as claimed in claim 2, wherein:
the optical circulator is characterized by further comprising an arc plate arranged in the fixed pipe, the arc plate comprises an arc bottom surface and an installation plane, the arc bottom surface is installed on the arc inner wall of the fixed pipe, and the first birefringent crystal, the first half-wave plate group, the first Faraday rotator, the second birefringent crystal, the second Faraday rotator, the second half-wave plate group and the third birefringent crystal are all installed on the installation plane.
8. An optical circulator as claimed in claim 1, wherein:
the dual-fiber collimator includes a single-mode fiber, a multi-mode fiber, a capillary tube and a lens, the single-mode fiber and the multi-mode fiber being inserted into the capillary tube in parallel.
9. An optical circulator as claimed in any one of claims 1 to 8, wherein:
the negative lens group includes at least one concave lens, biconcave lens, plano-concave lens, or negative meniscus lens.
10. An optical circulator as claimed in any one of claims 1 to 8, wherein:
the positive lens group includes at least one convex lens, biconvex lens, plano-convex lens, or positive meniscus lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023137525.XU CN214067437U (en) | 2020-12-23 | 2020-12-23 | Optical circulator integrating beam expanding function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023137525.XU CN214067437U (en) | 2020-12-23 | 2020-12-23 | Optical circulator integrating beam expanding function |
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| Publication Number | Publication Date |
|---|---|
| CN214067437U true CN214067437U (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023137525.XU Active CN214067437U (en) | 2020-12-23 | 2020-12-23 | Optical circulator integrating beam expanding function |
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| CN (1) | CN214067437U (en) |
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2020
- 2020-12-23 CN CN202023137525.XU patent/CN214067437U/en active Active
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