CN216979482U

CN216979482U - Double-refraction crystal type non-magnetic ring optical isolator

Info

Publication number: CN216979482U
Application number: CN202220271233.5U
Authority: CN
Inventors: 刘峰; 周孟欣; 宋立
Original assignee: Changfei Wuhan Photosystem Co ltd
Current assignee: Changfei Wuhan Photosystem Co ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-07-15
Anticipated expiration: 2032-02-10

Abstract

The utility model discloses a birefringent crystal type magnetic-ring-free optical isolator which comprises an installation sleeve, wherein an incident plate is spirally connected to the surface of one end of the installation sleeve, an emergent plate is spirally connected to the surface of the other end of the installation sleeve, an electrifying controller is fixedly installed on the surface of the installation sleeve, and a Faraday optical rotator is arranged in the installation sleeve. According to the double-refraction crystal type magnetic-ring-free optical isolator, the arranged Faraday optical rotator adopts the double-refraction crystal with low cost to replace a polarization element in the traditional free space optical isolator, so that the same function can be achieved at low cost, the coil connected to the surface of the Faraday optical rotator can replace the traditional magnetic ring structure through the arranged power-on controller component, the material cost can be further saved, meanwhile, the Faraday optical rotator can be conveniently adhered to the inner wall of the coil, and the function of the device is not inferior to that of the traditional free space optical isolator.

Description

Double-refraction crystal type non-magnetic ring optical isolator

Technical Field

The utility model relates to the technical field of optical isolator structures, in particular to a birefringent crystal type non-magnetic ring optical isolator.

Background

With the rapid development of optical communication technology, the prevention of reflection existing in an optical path in an optical module is an important problem which must be solved, so that a non-reciprocal passive optical device which only allows light to be transmitted along a forward optical path, namely an optical isolator, is needed, the influence of reflected light on the stability of a system light source is reduced, the precision and the safety of a transmission light source are ensured, the optical isolator can be divided into an online type and a free space type according to the structure of the optical isolator, the free space type isolator is mainly applied to optical paths of semiconductor lasers and optical modules, and because light emitted by the lasers has extremely high linearity, the free space type optical isolator related to polarization can be adopted; the existing optical isolator has certain disadvantages when in use, the existing free space type optical isolator mainly comprises a 0-degree polaroid, a Faraday rotator and a 45-degree polaroid to form the Faraday optical rotator, a magnetic ring is additionally arranged, the polarization state of return light is vertical to incident light due to the nonreciprocity of the Faraday rotator, so that the return light cannot pass through the 0-degree polaroid, the effect of inhibiting the return light is achieved, the polaroid and the Faraday rotator are imported abroad at present, the price is high, and the cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a birefringent crystal type non-magnetic ring optical isolator which can effectively solve the problems in the background technology.

In order to achieve the purpose, the utility model adopts the technical scheme that:

a double-refraction crystal type non-magnetic ring optical isolator comprises a mounting sleeve, wherein an incident plate is spirally connected to the surface of one end of the mounting sleeve, an emergent plate is spirally connected to the surface of the other end of the mounting sleeve, a power-on controller is fixedly mounted on the surface of the mounting sleeve, and a Faraday optical rotator is arranged inside the mounting sleeve;

faraday optical rotator is including setting up in the inside first birefringence crystal of installation cover, the other end fixedly connected with Faraday optical rotation piece of first birefringence crystal, the other end fixedly connected with second birefringence crystal of Faraday optical rotation piece, the material of first birefringence crystal and second birefringence crystal is titanium dioxide, first birefringence crystal, Faraday optical rotation piece and second birefringence crystal pass through the binder and connect.

Preferably, threaded grooves are formed in the surfaces of the two ends of the installation sleeve, an installation groove is formed in the installation sleeve, a positioning block is fixedly installed on the surface of one end of the installation sleeve, and a positioning groove is formed in the surface of the positioning block.

Preferably, a first spiral groove is formed in the side surface of the incident plate, a first connecting frame is fixedly mounted at the middle of one end surface of the incident plate, and an incident optical cable is connected to the surface of the first connecting frame in an embedded manner.

Preferably, a second spiral groove is formed in the side surface of the emergent plate, a second connecting frame is fixedly mounted at the middle of one end surface of the emergent plate, and an emergent optical cable is connected to the surface of the second connecting frame in an embedded mode.

Preferably, a coil is connected to the surface of the power controller, and a power interface is fixedly connected to the surface of the coil.

Preferably, the surfaces of the first birefringent crystal and the second birefringent crystal are plated with antireflection films, and the assembly angle of the antireflection films on the surfaces of the first birefringent crystal and the second birefringent crystal is seven degrees.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, the arranged Faraday optical rotator adopts the birefringent crystal with low cost to replace a polarizing element in the traditional free space optical isolator, so that the same function can be achieved with low cost, the traditional magnetic ring structure is replaced by the coil connected to the surface of the Faraday optical rotator through the arranged power-on controller component, the material cost can be further saved, meanwhile, the Faraday optical rotator can be conveniently adhered to the inner wall of the coil, and the device function is not inferior to that of the traditional free space optical isolator.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a birefringent crystal-type magnetic-ring-free optical isolator according to the present invention;

FIG. 2 is a schematic cross-sectional view of a mounting sleeve of a birefringent crystal-type magnetic-ring-free optical isolator according to the present invention;

FIG. 3 is a schematic diagram of the connection of a power-on controller assembly and a Faraday rotator of a birefringent crystal-type magnetic-ring-free optical isolator according to the present invention.

In the figure: 1. installing a sleeve; 101. a thread groove; 102. mounting grooves; 103. positioning a block; 2. an incident plate; 201. a first screw groove; 202. a first connecting frame; 203. an incident optical cable; 3. an exit plate; 301. a second screw groove; 302. an outgoing optical cable; 4. a power-on controller; 401. a coil; 402. a power interface; 5. a Faraday rotator; 501. a first birefringent crystal; 502. a Faraday rotator; 503. a second birefringent crystal.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1-3, a birefringent crystal type magnetic-ring-free optical isolator comprises a mounting sleeve 1, wherein one end surface of the mounting sleeve 1 is spirally connected with an incident plate 2, the other end surface of the mounting sleeve 1 is spirally connected with an emergent plate 3, a power-on controller 4 is fixedly mounted on the surface of the mounting sleeve 1, and a faraday optical rotator 5 is arranged inside the mounting sleeve 1;

the Faraday optical rotator 5 comprises a first birefringent crystal 501 arranged in the mounting sleeve 1, the other end of the first birefringent crystal 501 is fixedly connected with a Faraday optical rotation sheet 502, the other end of the Faraday optical rotation sheet 502 is fixedly connected with a second birefringent crystal 503, the first birefringent crystal 501 and the second birefringent crystal 503 are made of titanium dioxide, the first birefringent crystal 501, the Faraday optical rotation sheet 502 and the second birefringent crystal 503 are connected through a binder, the optical path gluing scheme is adopted for generating the Faraday optical rotator 5, the first birefringent crystal 501 and the second birefringent crystal 503 which are made of titanium dioxide are glued with the Faraday optical rotation sheet 502 by using an adhesive, and then a small piece of the Faraday optical rotator 5 for use can be generated through a dicing saw;

threaded grooves 101 are formed in the surfaces of two ends of the installation sleeve 1, an installation groove 102 is formed in the installation sleeve 1, a positioning block 103 is fixedly installed on the surface of one end of the installation sleeve 1, positioning grooves are formed in the surface of the positioning block 103, the installation of the incident plate 2 and the emergent plate 3 can be facilitated through the threaded grooves 101 which are symmetrically formed in the upper and lower directions, the installation groove 102 is used for installing the coil 401 and the Faraday optical rotator 5, and when the optical isolator needs to be installed on the surface of a workbench in a positioning mode, the optical isolator can be fixed through bolts and the positioning grooves in the surface of the positioning block 103;

the side surface of the incident plate 2 is provided with a first screw groove 201, the surface of one end of the incident plate 2 is positioned at the middle part and is fixedly provided with a first connecting frame 202, the surface of the first connecting frame 202 is embedded and connected with an incident optical cable 203, the incident plate 2 can be screwed in and out on the surface of the screw groove 101 by utilizing the first screw groove 201, the operation is simple and convenient, and the first connecting frame 202 can be conveniently embedded and placed with the incident optical cable 203 so as to ensure that the incident light is stably injected into the installation sleeve 1;

a second screw groove 301 is formed in the side surface of the emergent plate 3, a second connecting frame is fixedly installed at the position, located in the middle, of the surface of one end of the emergent plate 3, an emergent optical cable 302 is embedded and connected into the surface of the second connecting frame, the emergent plate 3 can be screwed in and out of the surface of the screw groove 101 through the second screw groove 301, the operation is simple and convenient, and the emergent optical cable 302 can be conveniently embedded and placed in the second connecting frame, so that the emergent light can be stably emitted out of the installation sleeve 1;

the surface of the electrifying controller 4 is connected with a coil 401, the surface of the coil 401 is fixedly connected with a power interface 402, the electrifying controller 4 can be used for switching on or switching off the current transmission on the surface of the coil 401 at any time, the isolation can be increased after the Faraday optical rotator 5 is close to the light incident surface, and then a magnetic field is formed by adjusting alternating current;

the surfaces of the first birefringent crystal 501 and the second birefringent crystal 503 are coated with antireflection films, and the assembly angle of the antireflection films on the surfaces of the first birefringent crystal 501 and the second birefringent crystal 503 is seven degrees, so that the stability of the return light can be guaranteed not to be influenced when the return light enters the light source.

The working principle is as follows: in the using process of the device, when light is transmitted in the forward direction, linearly polarized light passes through the first birefringent crystal 501 and the Faraday optical rotation sheet 502, the linearly polarized light is rotated by forty-five degrees, the light passes through the second birefringent crystal 503 smoothly, reverse light is divided into two beams of light by the second crystal and is transmitted respectively, the polarization direction is still rotated by the forty-five degrees anticlockwise when passing through the optical rotation sheet, the polarization state direction is perpendicular to the polarization direction of original input light after passing through the Faraday optical rotation sheet 502, and after passing through the polarization beam splitter formed by the birefringent crystals with the optical axis forming a certain included angle with the crystal surface, the transmission direction of the polarization beam splitter forms a certain included angle with the original direction, so that certain transverse displacement occurs between return light and the incident light, the return light cannot enter the light emitting element, the isolation effect is achieved, and the linearly polarized light emitted by the laser can pass through the forward direction and is cut to the reverse direction.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a birefringent crystal type does not have magnetic ring optical isolator, includes installation cover (1), its characterized in that: an incident plate (2) is spirally connected to the surface of one end of the mounting sleeve (1), an emergent plate (3) is spirally connected to the surface of the other end of the mounting sleeve (1), an electrifying controller (4) is fixedly mounted on the surface of the mounting sleeve (1), and a Faraday optical rotator (5) is arranged in the mounting sleeve (1);

faraday optical rotator (5) is including setting up in the inside first birefringent crystal (501) of installation cover (1), the other end fixedly connected with Faraday optical rotation piece (502) of first birefringent crystal (501), the other end fixedly connected with second birefringent crystal (503) of Faraday optical rotation piece (502), the material of first birefringent crystal (501) and second birefringent crystal (503) is titanium dioxide, first birefringent crystal (501), Faraday optical rotation piece (502) and second birefringent crystal (503) pass through the binder and connect.

2. A birefringent crystal-type magnetic-ring-less optical isolator as claimed in claim 1, wherein: threaded grooves (101) are formed in the surfaces of the two ends of the installation sleeve (1), an installation groove (102) is formed in the installation sleeve (1), a positioning block (103) is fixedly installed on the surface of one end of the installation sleeve (1), and a positioning groove is formed in the surface of the positioning block (103).

3. A birefringent crystal-type magnetic-ring-less optical isolator as claimed in claim 1, wherein: the side surface of the incidence plate (2) is provided with a first screw groove (201), a first connecting frame (202) is fixedly installed at the position, located in the middle, of one end surface of the incidence plate (2), and an incidence optical cable (203) is connected to the surface of the first connecting frame (202) in an embedded mode.

4. A birefringent crystal-type magnetic-ring-less optical isolator as claimed in claim 1, wherein: the side surface of the emergent plate (3) is provided with a second screw groove (301), a second connecting frame is fixedly arranged at the middle part of the surface of one end of the emergent plate (3), and an emergent optical cable (302) is embedded and connected to the surface of the second connecting frame.

5. A birefringent crystal-type magnetic-ring-less optical isolator as claimed in claim 1, wherein: the surface of the electrifying controller (4) is connected with a coil (401), and the surface of the coil (401) is fixedly connected with a power interface (402).

6. A birefringent crystal-type magnetic-ring-less optical isolator as claimed in claim 1, wherein: the surfaces of the first birefringent crystal (501) and the second birefringent crystal (503) are plated with antireflection films, and the assembly angle of the antireflection films on the surfaces of the first birefringent crystal (501) and the second birefringent crystal (503) is seven degrees.