CN219417928U - Small-size low-loss polarization-dependent optical isolator - Google Patents
Small-size low-loss polarization-dependent optical isolator Download PDFInfo
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- CN219417928U CN219417928U CN202320512841.5U CN202320512841U CN219417928U CN 219417928 U CN219417928 U CN 219417928U CN 202320512841 U CN202320512841 U CN 202320512841U CN 219417928 U CN219417928 U CN 219417928U
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- isolator
- isolator body
- lens optical
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- packaging tube
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- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 230000010287 polarization Effects 0.000 title claims abstract description 19
- 230000001419 dependent effect Effects 0.000 title claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 33
- 238000004806 packaging method and process Methods 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 10
- 230000004323 axial length Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 13
- 238000010168 coupling process Methods 0.000 abstract description 13
- 238000005859 coupling reaction Methods 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Optical Couplings Of Light Guides (AREA)
Abstract
The utility model relates to a small-size low-loss polarization-dependent optical isolator which comprises a packaging tube, wherein an isolator body coaxial with the isolator body is arranged in the packaging tube, a metal sleeve and a magnetic ring which are sequentially sleeved on the isolator body and coaxial with the isolator body are arranged in a sleeved mode, tapered lens optical fibers coaxial with the isolator body are respectively arranged at two ends of the packaging tube in a penetrating mode, and the taper angle directions of the two tapered lens optical fibers face to the isolator body. The volume of the whole device can be greatly reduced by arranging the conical lens optical fiber capable of realizing the focusing function to replace a collimator in the conventional device, the minimum length of the whole device using the conical lens optical fiber can be smaller than 10mm, and the whole device is 1/3 of the conventional device, meanwhile, the conical lens optical fiber is used, so that the whole structure is simple, the difficulty of a product manufacturing process is reduced, the optical path transmission process is shortened, the coupling efficiency is improved, and the optical path coupling loss is reduced.
Description
Technical Field
The utility model relates to the technical field of optical fiber communication, in particular to a small-size low-loss polarization-dependent optical isolator.
Background
The optical isolator is a passive magneto-optical device that mainly uses the faraday effect of a magneto-optical crystal to isolate reflected light, allowing only light to be transmitted in a single direction. The optical isolator consists of three parts, namely a polarizer, an optical rotator and an analyzer. A polarizer is an optical device whose output beam becomes linearly polarized light in a direction, which is the polarization axis of the polarizer, when the beam is incident thereon. When the polarization direction of the incident light is perpendicular to the polarization axis of the polarizer, the light cannot pass through, so that the polarizer can be used as an analyzer. The optical rotator consists of optical activity material and permanent magnet, and the polarization direction of light passing through the optical rotator is rotated to a certain degree by means of magneto-optical effect.
The conventional polarization dependent optical isolator components as shown in fig. 3 are: pigtail (Pigtail), C-lens (C-type lens), magnet (Magnet), core (Core), center Tube (Center Tube), glass Tube (Glass Tube), outer House (shell), tail Cover (Tail Cover) several parts are assembled, the device structure of this type is complicated, the light path transmission process needs to be coupled for many times to increase the optical signal loss, and meanwhile, because of more component parts, the whole device packaging size is bigger, and the device occupies a larger space in a module.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a small-size low-loss polarization-dependent optical isolator.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a relevant optical isolator of small-size low loss polarization, includes the encapsulation pipe, the inside isolator body that is provided with rather than coaxial line, the metal sleeve pipe and the magnetic ring of just rather than coaxial line of cover in proper order establishing on the isolator body, the encapsulation pipe both ends all wear to be equipped with the toper lens optic fibre of isolator body same axial lead, two the cone angle direction of toper lens optic fibre all is towards the isolator body.
Preferably, the taper angles of the two tapered lens optical fibers are spherical structures.
Preferably, the angle of taper of both the tapered-lens fibers is in the range of 30 degrees to 60 degrees.
Preferably, two capillaries are arranged in the metal sleeve, the two capillaries are correspondingly positioned at two sides of the isolator body, and the two tapered lens optical fibers correspondingly penetrate out of the two capillaries.
Preferably, one ends of the two capillaries far away from the isolator body extend out of the packaging tube, two ends of the packaging tube are correspondingly provided with tail sleeves correspondingly matched and embedded with the two capillaries, and the two tapered lens optical fibers correspondingly penetrate out of the two tail sleeves.
Preferably, the end faces of the two capillaries close to the isolator body are both planar structures, and the end faces of the two capillaries far away from the isolator body are both cambered structures.
Preferably, the axial length of the magnetic ring is greater than the axial distance between the two tapered lens fibers.
The utility model has the beneficial effects that: the volume of the whole device can be greatly reduced by arranging the conical lens optical fiber capable of realizing the focusing function to replace a collimator in the conventional device, the minimum length of the whole device using the conical lens optical fiber can be smaller than 10mm, and the whole device is 1/3 of the conventional device, meanwhile, the conical lens optical fiber is used, so that the whole structure is simple, the difficulty of a product manufacturing process is reduced, the optical path transmission process is shortened, the coupling efficiency is improved, and the optical path coupling loss is reduced.
Drawings
FIG. 1 is a schematic cross-sectional view of an embodiment of the present utility model;
FIG. 2 is a schematic diagram of optical coupling according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a prior art product construction;
part names and serial numbers in the figure: 1-packaging tube 2-isolator body 3-metal sleeve 4-magnetic ring 5-conical lens optical fiber 6-capillary 7-tail sleeve.
Detailed Description
For the purpose of illustrating more clearly the objects, technical solutions and advantages of embodiments of the present utility model, the present utility model will be further described with reference to the accompanying drawings and embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "front", "rear", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or directions or positional relationships in which the product of the present utility model is conventionally put in use, are merely for convenience of describing the present utility model and for simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.
The embodiment of the utility model is shown in fig. 1 to 2, and the small-size low-loss polarization-dependent optical isolator comprises a packaging tube 1, wherein an isolator body 2 coaxial with the packaging tube 1 is arranged in the packaging tube, a metal sleeve 3 and a magnetic ring 4 which are sequentially sleeved on the isolator body 2 and coaxial with the isolator body, conical lens optical fibers 5 coaxial with the isolator body 2 are respectively arranged at two ends of the packaging tube 1 in a penetrating way, and the cone angle directions of the two conical lens optical fibers 5 face the isolator body 2.
Further improvement, as shown in fig. 1 to 2, the taper angles of the two tapered lens fibers 5 are both spherical structures, and it is preferable that the angle ranges of the taper angles of the two tapered lens fibers 5 are both 30 degrees to 60 degrees, and the condensing effect is better.
Specifically, the axial length of the magnetic ring 4 is greater than the axial distance between the two tapered lensed fibers 5, that is, the magnetic ring 4 covers the taper angle of the tapered lensed fiber 5 passing through the isolator body 2 to the other end, at least from the taper angle of the tapered lensed fiber 5 at one end.
As shown in fig. 1 to 2, two capillaries 6 are arranged in the metal sleeve 3, the two capillaries 6 are correspondingly positioned at two sides of the isolator body 2, the two tapered lens optical fibers 5 correspondingly penetrate out of the two capillaries 6, preferably, one ends of the two capillaries 6 far away from the isolator body 2 are all extended out of the packaging tube 1, two ends of the packaging tube 1 are correspondingly provided with tail sleeves 7 correspondingly matched and embedded with the two capillaries 6, the two tapered lens optical fibers 5 correspondingly penetrate out of the two tail sleeves 7, the tail sleeves 7 can play a role of protecting and supporting the capillaries 6 and the tapered lens optical fibers 5, further preferably, one end surfaces of the two capillaries 6 close to the isolator body 2 are of a plane structure, one end surfaces of the two capillaries 6 far away from the isolator body 2 are of an arc surface structure, and the connection between the capillaries 6 and the tail sleeves 7 can be more stable by arranging the end surfaces of the capillaries 6 far away from the isolator body 2 into the arc surface structure.
In a specific working process, as shown in fig. 1 to 2, an optical signal is transmitted from the left end of the tapered lens optical fiber 5 at the left end, focusing and collimation treatment are carried out on the optical signal through the taper angle end of the tapered lens optical fiber 5, an original input divergent optical signal is converted into a collimation focusing light spot, the light spot is received by the tapered lens optical fiber 5 at the right end through the isolator body 2 after being collimated and focused, the optical signal is output to the right end of the tapered lens optical fiber 5 at the right end, the volume of the whole device can be greatly reduced by arranging the tapered lens optical fiber 5 capable of realizing the focusing function to replace a collimator in a conventional device, the minimum length of the whole device using the tapered lens optical fiber 5 can be smaller than 10mm, and the whole length is 1/3 of the conventional device (shown in fig. 3), meanwhile, the use of the tapered lens optical fiber 5 not only simplifies the whole structure, reduces the difficulty of a product manufacturing process, but also shortens the light path transmission process, improves the coupling efficiency and reduces the coupling loss of a light path.
More specifically, the cone angle R value of the tapered lens optical fiber 5 can be calculated through NA (numerical aperture) value and mode field of the coupling interface material, that is, the size of the output light spot and the coupling distance of the tapered lens optical fiber 5 can be designed and manufactured according to the coupling requirement, and the coupling efficiency of the optical path can be further improved and the coupling loss of the optical path in the device can be optimized through matching the coupling interface material; the whole optical path transmission interface is a glue-free scheme, and optical path loss caused by thermal expansion and contraction of glue is not needed to be considered, so that the wide temperature performance of the product is greatly improved.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (7)
1. A small-sized low-loss polarization dependent optical isolator, characterized by: the novel isolator comprises a packaging tube, wherein an isolator body which is coaxial with the isolator body, a metal sleeve and a magnetic ring which are sequentially sleeved on the isolator body and coaxial with the isolator body are arranged in the packaging tube, conical lens optical fibers which are coaxial with the isolator body are respectively arranged at two ends of the packaging tube in a penetrating mode, and cone angle directions of the two conical lens optical fibers face the isolator body.
2. The small-scale, low-loss polarization dependent optical isolator of claim 1, wherein: the cone angles of the two conical lens optical fibers are spherical structures.
3. The small-scale, low-loss polarization dependent optical isolator of claim 1, wherein: the angle of taper of both of the tapered lensed fibers ranges from 30 degrees to 60 degrees.
4. The small-scale, low-loss polarization dependent optical isolator of claim 1, wherein: two capillaries are arranged in the metal sleeve, the two capillaries are correspondingly positioned at two sides of the isolator body, and the two tapered lens optical fibers correspondingly penetrate out of the two capillaries.
5. The small-scale, low-loss polarization dependent optical isolator of claim 4, wherein: the two ends of the capillary tubes, which are far away from the isolator body, extend to the outside of the packaging tube, the two ends of the packaging tube are correspondingly provided with tail sleeves which are correspondingly matched and embedded with the two capillary tubes, and the two conical lens optical fibers correspondingly penetrate out of the two tail sleeves.
6. The small-scale, low-loss polarization dependent optical isolator of claim 4, wherein: the end faces of the two capillaries, which are close to the isolator body, are of planar structures, and the end faces of the two capillaries, which are far away from the isolator body, are of cambered structures.
7. The small-scale, low-loss polarization dependent optical isolator of claim 1, wherein: the axial length of the magnetic ring is greater than the axial distance between the two conical lens optical fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320512841.5U CN219417928U (en) | 2023-03-10 | 2023-03-10 | Small-size low-loss polarization-dependent optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320512841.5U CN219417928U (en) | 2023-03-10 | 2023-03-10 | Small-size low-loss polarization-dependent optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219417928U true CN219417928U (en) | 2023-07-25 |
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ID=87228609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320512841.5U Active CN219417928U (en) | 2023-03-10 | 2023-03-10 | Small-size low-loss polarization-dependent optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219417928U (en) |
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2023
- 2023-03-10 CN CN202320512841.5U patent/CN219417928U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20241011 Address after: 518000, Building 11, Building 201, Hebei Industrial Zone, Hualian Community, Longhua Street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Feiyu Fiber Optic Co.,Ltd. Country or region after: China Address before: 518000 area a on the second floor, area D on the third floor and area a on the fourth floor of deliwei Industrial Park on the east side of Dalang South Road, building 11, Hebei Industrial Zone, Hualian community, Longhua street, Shenzhen City, Guangdong Province Patentee before: FLYIN OPTRONICS CO.,LTD. Country or region before: China |