CN211478702U - Symmetrical structure's optical fiber coupling structure of little battery of lens - Google Patents
Symmetrical structure's optical fiber coupling structure of little battery of lens Download PDFInfo
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- CN211478702U CN211478702U CN201921739323.7U CN201921739323U CN211478702U CN 211478702 U CN211478702 U CN 211478702U CN 201921739323 U CN201921739323 U CN 201921739323U CN 211478702 U CN211478702 U CN 211478702U
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Abstract
The utility model discloses a symmetrical structure's optical fiber coupling structure of little battery of lens, including two sets of little battery of lens, source optical fiber and receipt optic fibre, little battery of lens including the quartz substrate, install plano-convex lens in a side of quartz substrate, place two sets of little battery of lens symmetry, source optical fiber and receipt optic fibre respectively with the incident surface and the coincidence of emergent surface of the quartz substrate in two sets of little battery of lens. The utility model discloses place a plano-convex type microlens on the quartz substrate, form a microlens group. And the two micro lens groups are symmetrically arranged, and the end surfaces of the optical fibers are superposed with the incident surface or the emergent surface of the lens groups. The signal comes out from the source optical fiber, enters the receiving optical fiber after passing through the two micro lens groups, and the coupling efficiency is improved by adjusting the distance between the lens groups; the symmetrical structure is compact, and the micro lens has small volume, high integration level, high coupling efficiency and less loss.
Description
Technical Field
The utility model relates to an optic fibre device technical field especially relates to a symmetrical structure's optical fiber coupling structure of little battery of lens.
Background
With the widespread use of 1.3um low-loss, zero-dispersion single-mode (SMF) fibers and the rapid development of high-speed, high-capacity fiber-optic communications, fiber-to-fiber coupling is increasingly gaining attention. The application in life is very wide. With the progress of scientific technology, the current instruments and equipment have developed towards the trend of light, mechanical and electrical integration. The optical fiber coupler has large return loss and low coupling efficiency, and is easy to influence signal transmission. The ratio of the light transmission area to the total area of the ultra-small lens group is large, in the information transmission process, information is leaked very little through gaps among lens elements, the transmitted information is distorted little, the current development is fast, and the ultra-small lens group is applied to the fields of optical fiber sensing, optoelectronic devices, bionics and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is exactly in order to compensate prior art's defect, provides a symmetrical structure's little battery of optical fiber coupling structure, makes optical fiber coupling efficiency higher, and the loss is less, and compact structure is comfortable, and the coupling tolerance ratio is smaller, improves single mode fiber's coupling efficiency.
The utility model discloses a realize through following technical scheme:
the optical fiber coupling structure of the symmetrical micro lens group comprises two groups of micro lens groups, source optical fibers and receiving optical fibers, wherein each micro lens group comprises a quartz substrate, a plano-convex lens is arranged on one side surface of the quartz substrate, the two groups of micro lens groups are symmetrically arranged, and the source optical fibers and the receiving optical fibers are respectively superposed with the incident surface and the emergent surface of the quartz substrate in the two groups of micro lens groups.
The plano-convex lens adopts a SUSS MicroOpticsFC-Q-250 micro lens.
The quartz substrate is a fused quartz substrate, the thickness of the quartz substrate is 0.9mm, the internal transmittance is more than 0.99, the diameter of the lens is 240 mu m, the pitch of the lens is 250 mu m, the curvature radius is 330 mu m, the conic constant is 0, and the numerical aperture is 0.17.
The source fiber and the receiving fiber are both single-mode fiber Corning SMF-28e, the numerical aperture is 0.14, and the fiber core diameter is 8.3 mu m.
The distance between the two plano-convex lenses was set to 2.07 mm.
A single-layer MgF2 antireflection film is added on the surfaces of the two plano-convex lenses, so that the coupling efficiency is improved.
The utility model has the advantages that: the utility model discloses place a plano-convex type microlens on the quartz substrate, form a microlens group. And the two micro lens groups are symmetrically arranged, and the end surfaces of the optical fibers are superposed with the incident surface or the emergent surface of the lens groups. The signal comes out from the source optical fiber, enters the receiving optical fiber after passing through the two micro lens groups, and the coupling efficiency is improved by adjusting the distance between the lens groups; the symmetrical structure is compact, and the micro lens has small volume, high integration level, high coupling efficiency and less loss.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, the optical fiber coupling structure of the symmetrical micro lens group comprises two micro lens groups, a source optical fiber 1 and a receiving optical fiber 2, wherein the micro lens group comprises a quartz substrate 3, a plano-convex lens 4 is installed on one side surface of the quartz substrate 3, the two micro lens groups are symmetrically arranged, and the source optical fiber 1 and the receiving optical fiber 2 are respectively overlapped with an incident surface and an emergent surface of the quartz substrate 3 in the two micro lens groups.
The plano-convex lens 4 adopts a SUSS MicroOpticsFC-Q-250 micro lens.
The quartz substrate 3 is a fused quartz substrate, the thickness of the quartz substrate is 0.9mm, the internal transmittance is more than 0.99, the diameter of the lens is 240 μm, the pitch of the lens is 250 μm, the curvature radius is 330 μm, the conic constant is 0, and the numerical aperture is 0.17.
The source optical fiber 1 and the receiving optical fiber 2 are both single-mode optical fibers Corning SMF-28e, the numerical aperture is 0.14, and the fiber core diameter is 8.3 mu m.
The distance between the two plano-convex lenses 4 was set to 2.07 mm.
And a single-layer MgF2 antireflection film is added on the surfaces of the two plano-convex lenses 4.
The utility model discloses use SUSS MicroOpticsFC-Q-250 microlens and quartz substrate to form little battery, put two little battery symmetries after, the coincidence of the quartz substrate terminal surface of corning SMF-28e fiber end face and battery of lens, will adjust the distance between the little battery of lens again and can reach the optimum with coupling efficiency. The specific structure design method is as follows:
(1) the microlens array is placed on a quartz substrate. Microlens array SUSS micro optics SMO 39920: the substrate material is a fused quartz substrate, the thickness of the fused quartz substrate is 0.9mm, the internal transmittance is more than 0.99, the diameter of the lens is 240 mu m, the pitch of the lens is 250 mu m, the curvature radius is 330 mu m, the cone constant is 0, the numerical aperture is 0.17.
(2) The two microlens sets are symmetrically arranged. The parameters of the above elements provided by the supplier are as follows: (1) the numerical aperture of the single-mode fiber Corning SMF-28e is 0.14, the diameter of a fiber core is 8.3 mu m, the diameter of a mode field is 1.31 mu m, and the diameter of a mode field is 9.2 +/-0.4 mu m.
(4) The end face of the optical fiber is superposed with the end face of the micro lens group. And (3) enabling the end face of the optical fiber to be overlapped with the incident face of the end face of the quartz substrate.
(3) And adjusting the distance between the two microlens sets. The distance between the two lens groups was set to 2.07mm, and the system aperture stop was set to float according to the stop size.
After the structure design is finished, a Gaussian beam with the wavelength of 1.31 mu m and the beam waist diameter of 4.6 mu m is input, and the coupling efficiency of the current system is 86 percent. And a single MgF2 antireflection film is added on each glass surface, so that the coupling efficiency is increased to 91.965%, and the loss is only 0.38 dB.
1. The double-microlens array has an inverted symmetrical structure and a compact structure, the coupling efficiency is greatly improved by using the microlenses to couple the optical fibers, and the loss of light energy is also reduced.
2. The micro lens array has the characteristics of small volume, light weight and high integration level. The use of a microlens array is convenient.
3. Allowing source and receive fibers with any complex pattern while also fully accounting for diffraction effects.
Claims (6)
1. The utility model provides a symmetrical structure's optical fiber coupling structure of little battery of lens which characterized in that: the micro lens group comprises a quartz substrate, a plano-convex lens is arranged on one side surface of the quartz substrate, the two micro lens groups are symmetrically arranged, and the source optical fiber and the receiving optical fiber are respectively superposed with the incident surface and the emergent surface of the quartz substrate in the two micro lens groups.
2. The optical fiber coupling structure of a symmetrical micro-lens assembly according to claim 1, wherein: the plano-convex lens adopts a SUSS MicroOpticsFC-Q-250 micro lens.
3. The optical fiber coupling structure of a symmetrical microlens set according to claim 2, wherein: the quartz substrate is a fused quartz substrate, the thickness of the quartz substrate is 0.9mm, the internal transmittance is more than 0.99, the diameter of the lens is 240 mu m, the pitch of the lens is 250 mu m, the curvature radius is 330 mu m, the conic constant is 0, and the numerical aperture is 0.17.
4. The optical fiber coupling structure of a symmetrical micro-lens assembly according to claim 3, wherein: the source fiber and the receiving fiber are both single-mode fiber Corning SMF-28e, the numerical aperture is 0.14, and the fiber core diameter is 8.3 mu m.
5. The optical fiber coupling structure of a symmetrical micro-lens assembly according to claim 4, wherein: the distance between the two plano-convex lenses was set to 2.07 mm.
6. The optical fiber coupling structure of a symmetrical micro-lens assembly according to claim 5, wherein: and a single-layer MgF2 antireflection film is added on the surfaces of the two plano-convex lenses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921739323.7U CN211478702U (en) | 2019-10-17 | 2019-10-17 | Symmetrical structure's optical fiber coupling structure of little battery of lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921739323.7U CN211478702U (en) | 2019-10-17 | 2019-10-17 | Symmetrical structure's optical fiber coupling structure of little battery of lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211478702U true CN211478702U (en) | 2020-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921739323.7U Active CN211478702U (en) | 2019-10-17 | 2019-10-17 | Symmetrical structure's optical fiber coupling structure of little battery of lens |
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| CN (1) | CN211478702U (en) |
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2019
- 2019-10-17 CN CN201921739323.7U patent/CN211478702U/en active Active
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