CN213240586U - Micro-structure reflection-type optical isolator - Google Patents
Micro-structure reflection-type optical isolator Download PDFInfo
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- CN213240586U CN213240586U CN202022387210.4U CN202022387210U CN213240586U CN 213240586 U CN213240586 U CN 213240586U CN 202022387210 U CN202022387210 U CN 202022387210U CN 213240586 U CN213240586 U CN 213240586U
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
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- 230000009286 beneficial effect Effects 0.000 description 3
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- 229910009372 YVO4 Inorganic materials 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a micro-structure reflection-type optical isolator, which comprises a beam splitter, a half-wave plate, a collimating lens, a Faraday optical rotator and a reflecting element which are distributed along the forward transmission path of light; the collimating lens, the Faraday element and the reflecting element are mutually and tightly attached; two ports are arranged on one side of the beam splitter, which is far away from the half-wave plate; the forward optical path transmission process of the micro-structure reflection-type optical isolator is as follows: incident light is input from one port, is divided into o light and e light through the beam splitter, and the polarization direction anticlockwise rotates 45 degrees after passing through the half-wave plate, and then passes through collimating lens collimation, then rotates the polarization direction anticlockwise 22.5 degrees by the Faraday optical rotator, and then reflects to the Faraday optical rotator through the reflecting element, rotates the polarization direction anticlockwise 22.5 degrees again, and emergent light o light becomes e light, and e light becomes o light, and then o light and e light pass through the beam splitter and gathers into a beam of light and export from another port.
Description
Technical Field
The utility model relates to an optical isolator technical field, more specifically say, relate to a micro-structure reflection-type optical isolator.
Background
The polarization-dependent optical isolator is used as an important component of a polarization-maintaining optical fiber device, has the function of allowing light to pass through forward and reverse isolation, and simultaneously has strong polarization-maintaining capacity, so that the polarization-dependent optical isolator becomes a key device of various civil or military interference type sensors and coherent communication.
The development of isolators is mature at present and can be divided into free space isolators and on-line isolators. The most common on-line isolator consists of collimators at both ends and an isolator core in the center. The core part comprises a polarization displacement device, a Faraday rotator and a half-wave plate, and the size of the structure is limited by the influence of factors such as the working distance of a collimator, the size of a polarization light splitting device and the like, so that the length cannot be very small.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a microstructure reflection-type optical isolator is provided.
The utility model provides a technical scheme that its technical problem adopted is:
constructing a micro-structured reflection-type optical isolator including a beam splitter, a half-wave plate, a collimator lens, a Faraday rotator, and a reflecting element, which are distributed along a forward transmission path of light; the collimating lens is closely attached to the Faraday rotator, and the Faraday rotator is closely attached to the reflecting element;
the forward optical path transmission process of the microstructure reflection-type optical isolator is as follows: incident light is divided into o light and e light through the beam splitter, the polarization directions of the o light and the e light are rotated anticlockwise by 45 degrees after passing through the half-wave plate, the o light and the e light are collimated through the collimating lens, then the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees through the Faraday optical rotator, then the o light and the e light pass through the reflecting element, then the light returns to the Faraday optical rotator, the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees again, the incident light o light changes the e light, the e light changes the o light, and then the o light and the e light are converged into a beam of light again through the beam splitter.
Preferably, the optical axis angle of the beam splitter is 45 degrees, and the beam splitter has the function of splitting and combining light.
Preferably, the beam splitter is made of YVO 4.
Preferably, the collimating lens and the faraday rotator are bonded by optical cement, and the faraday rotator and the reflecting element are bonded by optical cement.
Preferably, the collimating lens is a silicone lens.
Preferably, the half-wave plate is a 22.5-degree half-wave plate and is made of quartz crystal.
Preferably, the reflecting element is specifically glass coated with a high-reflection film.
Preferably, two ports corresponding to the input and output ends of the optical fiber are arranged on one side of the beam splitter away from the half-wave plate.
The beneficial effects of the utility model reside in that: compared with the conventional transmission type isolator, the size of the device is only half of the size of the existing design, so the appearance size of the product is greatly reduced, and the cost can also be only half of the size of the existing design due to the reduction of the size; can directly assemble into core assembly with collimating lens, Faraday rotator and reflecting element, when adjusting the product, only need directly adjust distance and angle between beam splitter and this core assembly, consequently it is low to the requirement of product regulation and equipment, can effectively improve production efficiency and qualification rate, and the structure is more stable moreover, and the reliability is high to compare in Wedge type isolator, do not have the PMD influence, need not compensate it.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the drawings:
FIG. 1 is a schematic diagram of a forward transmission optical path of a micro-structured reflective optical isolator according to a preferred embodiment of the present invention;
fig. 2 is a polarization change diagram of a forward transmission light path of a micro-structured reflective optical isolator according to a preferred embodiment of the present invention, wherein a dotted arrow indicates an e-polarization direction and a solid arrow indicates an o-polarization direction;
fig. 3 is a polarization change diagram of a reverse transmission light path of a micro-structured reflection-type optical isolator according to a preferred embodiment of the present invention, in which a dotted arrow indicates an o-polarization direction and a solid arrow indicates an e-polarization direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention.
The microstructure reflection-type optical isolator according to the preferred embodiment of the present invention is shown in fig. 1, and referring to fig. 2 to 3, and includes a beam splitter 1, a half-wave plate 2, a collimator lens 3, a faraday rotator 4, and a reflection element 5, which are distributed along a forward transmission path of light; the collimating lens 3 is tightly attached to the Faraday optical rotator 4, and the Faraday optical rotator 4 is tightly attached to the reflecting element; two ports 01 and 02 respectively corresponding to the input and output ends of the optical fiber are arranged on one side of the beam splitter 1 away from the half-wave plate 2;
the forward optical path transmission process of the micro-structure reflection-type optical isolator is as follows: incident light is input from a port 01, is divided into o light and e light by a beam splitter 1, the polarization directions of the o light and the e light are rotated anticlockwise by 45 degrees after passing through a half-wave plate 2, and are collimated by a collimating lens 3, then the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees by a Faraday optical rotator, and then the light passes through a reflecting element 5, and then the light returns to the Faraday optical rotator 4, the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees again, the incident light is changed into the e light and the e light, and then the o light and the e light are converged into a beam again by the beam splitter 1 again to be output from a port 02;
the reverse light path transmission process of the micro-structure reflection-type optical isolator is as follows: incident light is divided into o light and e light through a beam splitter 1, the o light and the e light are collimated through a collimating lens 3, then the polarization directions of the o light and the e light are rotated by 22.5 degrees in a counterclockwise way through a Faraday optical rotator, the o light and the e light pass through a reflecting element 5, then the light returns to the Faraday optical rotator 4, the polarization directions of the o light and the e light are rotated by 22.5 degrees in a counterclockwise way again, the polarization directions of the o light and the e light are rotated by 45 degrees in a clockwise way after passing through a half-wave plate 2, the incident light o light is still the o light, the e light is still the e light, and then the o light and the e light respectively exit from two sides of a port 02 through the beam splitter 1 again and cannot;
the utility model can reduce the size of the structure by directly connecting the port on the optical splitter 1 with the optical fiber; compared with the conventional transmission type isolator, the size of the device is only half of the size of the existing design, so the appearance size of the product is greatly reduced, and the cost can also be only half of the size of the existing design due to the reduction of the size; can directly assemble into core assembly with collimating lens 3, Faraday rotator 4 and reflecting element 5, when adjusting the product, only need directly adjust distance and angle between optical splitter 1 and this core assembly, it is low to the requirement of product regulation and equipment, can effectively improve production efficiency and qualification rate, and the structure is more stable moreover, and the reliability is high to compare in Wedge type isolator, do not have the PMD influence, need not compensate it.
As shown in fig. 2-3, the optical axis angle of the beam splitter 1 is 45 degrees, and it has the function of splitting and combining light.
As shown in fig. 1, the beam splitter 1 is made of YVO4, and the thickness of YVO4 is 0.2 mm; a 10:1 splitting distance can be achieved, i.e., a crystal length of 10mm can separate O, E beams by a gap of about 1 mm.
As shown in fig. 1-3, the collimating lens 3 is bonded to the faraday rotator through optical cement, and the faraday rotator is bonded to the reflecting element through optical cement; the positions of all the parts are fixed, and the optical isolation effect can be achieved on the premise of keeping the volume small.
As shown in fig. 1, the collimator lens 3 is embodied as a silicon lens; is beneficial to reducing the size of the product.
As shown in fig. 1, the half-wave plate 2 is made of quartz crystal.
As shown in fig. 1 to 3, the reflective element 5 is specifically glass coated with a high reflective film on the surface; is beneficial to reducing the cost of the product.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (9)
1. A micro-structured reflection-type optical isolator comprising a beam splitter, a half-wave plate, a collimator lens, a Faraday rotator, and a reflecting element, which are disposed along a forward transmission path of light; the collimating lens is closely attached to the Faraday rotator, and the Faraday rotator is closely attached to the reflecting element.
2. The microstructured reflective optical isolator of claim 1, wherein said microstructured reflective optical isolator is configured to transmit in a forward optical path by: incident light is divided into o light and e light through the beam splitter, the polarization directions of the o light and the e light are rotated anticlockwise by 45 degrees after passing through the half-wave plate, the o light and the e light are collimated through the collimating lens, then the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees through the Faraday optical rotator, the o light and the e light pass through the reflecting element, then the light returns to the Faraday optical rotator, the polarization directions of the o light and the e light are rotated anticlockwise by 22.5 degrees again, the incident light o light changes the e light, the e light changes the o light, and then the o light and the e light are converged into a beam of light again through the beam splitter.
3. The microstructured reflective optical isolator of claim 1, wherein said beam splitter has an optic axis angle of 45 degrees and is capable of splitting and combining light.
4. The microstructured reflective optical isolator of claim 1, wherein said beam splitter is fabricated from YVO 4.
5. The microstructured reflective optical isolator of claim 1, wherein said collimating lens is optically bonded to said faraday rotator and said faraday rotator is optically bonded to said reflective element.
6. The microstructured reflective optical isolator of claim 1, wherein said collimating lens is embodied as a silicone lens.
7. The microstructured reflective optical isolator of claim 1, wherein said half-wave plate is specifically a 22.5 degree half-wave plate and is fabricated from quartz crystal.
8. The microstructured reflective optical isolator of claim 1, wherein said reflective element is embodied as a glass coated with a high reflectivity film.
9. The microstructured reflective optical isolator of claim 1, wherein the splitter is provided with two ports on a side thereof remote from the half-wave plate, the two ports corresponding to respective input and output ends of the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022387210.4U CN213240586U (en) | 2020-10-23 | 2020-10-23 | Micro-structure reflection-type optical isolator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022387210.4U CN213240586U (en) | 2020-10-23 | 2020-10-23 | Micro-structure reflection-type optical isolator |
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| CN213240586U true CN213240586U (en) | 2021-05-18 |
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| CN202022387210.4U Active CN213240586U (en) | 2020-10-23 | 2020-10-23 | Micro-structure reflection-type optical isolator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419363A (en) * | 2021-07-22 | 2021-09-21 | 北极光电(深圳)有限公司 | Reflection type polarization-maintaining optical isolator |
| WO2023040746A1 (en) * | 2021-09-17 | 2023-03-23 | 北京工业大学 | Cylindrical vector fiber optic isolator and optical device |
| CN117590629A (en) * | 2023-12-12 | 2024-02-23 | 深圳市飞宇光纤股份有限公司 | Reflective on-line optical isolator |
-
2020
- 2020-10-23 CN CN202022387210.4U patent/CN213240586U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113419363A (en) * | 2021-07-22 | 2021-09-21 | 北极光电(深圳)有限公司 | Reflection type polarization-maintaining optical isolator |
| WO2023040746A1 (en) * | 2021-09-17 | 2023-03-23 | 北京工业大学 | Cylindrical vector fiber optic isolator and optical device |
| CN117590629A (en) * | 2023-12-12 | 2024-02-23 | 深圳市飞宇光纤股份有限公司 | Reflective on-line optical isolator |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211029 Address after: No.5 Lianfeng Avenue, Zhuhai Free Trade Zone, Guangdong 519030 Patentee after: ZHUHAI FTZ OPLINK COMMUNICATIONS, Inc. Address before: 519000 room 3001, building 39, Shidai Shanhuhai phase 5, aviation new town, Jinwan District, Zhuhai City, Guangdong Province Patentee before: Lv Chengjiang |
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| TR01 | Transfer of patent right |