Subminiature circulator

Abstract

The utility model relates to a subminiature circulator, which comprises a first collimator, a circulator component and a second collimator which are sequentially arranged along the direction of an optical path, the circulator component comprises a first polarization splitting prism, a first wave plate, a first magneto-optical crystal, a birefringence wedge angle plate pair, a second magneto-optical crystal, a second wave plate and a second polarization splitting prism which are arranged along the light path direction; and the first magneto-optical crystal, the birefringence wedge angle sheet pair and the second magneto-optical crystal are matched with limiting grooves in the magnetic element. According to the utility model, the magnetic element is inverted-U-shaped, through the special structure of the magnetic element, the first magneto-optical crystal, the birefringence wedge angle sheet pair and the second magneto-optical crystal can be conveniently limited, the magnetic element is convenient to install, and the space is saved; the circulator component is arranged on the base strip; and the included angle between the mounting surface of the base strip and the horizontal plane is 4-10 degrees, so that a light beam enters the polarization splitting prism and the optical kernel according to the corresponding 4-10 degrees to correct the eccentricity of a light path.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical technology field especially relates to a super small circulator. BACKGROUND

[0002] Optical circulator is a kind of multi-port input-output nonreciprocal optical device, its function is to make optical signal only along the prescribed port sequence transmission. Its typical structure has N (N is greater than or equal to 3) ports, such as shown in figure, when light is input by port 1, light is output by port 2, when light is input by port 2, light is output by port 3, and so on. Figure 1

[0003] Due to the sequential transmission characteristics of optical circulator, it becomes an important device in bidirectional communication, it can be used to separate the optical signals of forward transmission and reverse transmission in the same optical fiber.

[0004] In data center and 5G application, it needs to place one or two circulators in a limited small space, to constitute the transceiver integrated module with doubled density, in such application, the size of circulator becomes the most critical requirement. INVENTION CONTENTS

[0005] In order to solve the above problems of prior art, the utility model provides a super small circulator.

[0006] In order to achieve the above purpose, the utility model adopts the main technical scheme includes:

[0007] A super small circulator, including first collimator, circulator component, second collimator arranged in turn along the light path direction, the circulator component includes first polarizing beam splitter, first wave plate, first magneto-optical crystal, birefringent wedge angle piece pair, second magneto-optical crystal, second wave plate, second polarizing beam splitter arranged along the light path direction, the first magneto-optical crystal, birefringent wedge angle piece pair, second magneto-optical crystal and the limiting slot on magnetic element cooperation.

[0008] Further, the circulator component is arranged on the base bar.

[0009] Further, the included angle between the mounting surface of the base bar and the horizontal plane is 4-10 °.

[0010] Further, the included angle between the mounting surface of the base bar and the horizontal plane is 7 °.

[0011] Further, the circulator component is provided with a sleeve.

[0012] Further, the magnetic element is inverted U-shaped.

[0013] ​The utility model discloses a beneficial effect is: the magnetic element is inverted U type, through the special structure of magnetic element, can conveniently to the first magneto -optical crystal, birefringent wedge angle piece pair, the second magneto -optical crystal is positioned, the structure of first magneto -optical crystal, birefringent wedge angle piece pair, second magneto -optical crystal after sticking is approximate for cuboid, its shape is cooperated with the shape of limit groove, can effectively utilize installation space, the installation of magnetic element is convenient, save space, the ring device part is set up on the base strip, the included angle of the mounting surface of base strip and horizontal plane is 4-10, make the light beam according to corresponding 4-10 incident in polarizing beam splitter and optical core, to correct optical path eccentricity. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the drawings needed to be used in the embodiment briefly introduced, should understand, the following drawings only shows some embodiments of the utility model, therefore should not be seen as the limitation to the scope, for ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0015] Figure 1 It is the structure explosion map of the utility model;

[0016] Figure 2 It is the structure structure perspective drawing of the utility model;

[0017] Mark explanation:

[0018] 10, first collimator;20, first polarizing beam splitter;30, first wave plate;40, first magneto -optical crystal;50, birefringent wedge angle piece pair;60, second magneto -optical crystal;70, second wave plate;80, second polarizing beam splitter;90, second collimator;100, base strip;110, magnetic element;111, limit groove;120, sleeve. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be broadly understood, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] As shown in Figures 1-2 A subminiature circulator includes a first collimator 10, a circulator component, and a second collimator 90 arranged in sequence along the light path direction; the circulator component includes a first polarization beam splitter prism 20, a first wave plate 30, a first magneto-optical crystal 40, a birefringent wedge angle piece pair 50, a second magneto-optical crystal 60, a second wave plate 70, and a second polarization beam splitter prism 80 arranged along the light path direction; the first magneto-optical crystal 40, the birefringent wedge angle piece pair 50, and the second magneto-optical crystal 60 cooperate with the limiting grooves 111 on the magnetic element 110;

[0023] In an embodiment, the circulator component is arranged on the base bar 100; the mounting surface of the base bar 100 is at an angle of 4-10° with the horizontal plane, so that the light beam is incident on the polarization beam splitter prism and the optical core at a corresponding 4-10°, to correct the optical path eccentricity; in an embodiment, the circulator component is externally provided with a sleeve 120 for packaging; in an embodiment, the mounting surface of the base bar 100 is at an angle of 7° with the horizontal plane.

[0024] In an embodiment, the magnetic element 110 is in the shape of an inverted U, through the special structure of the magnetic element 110, the first magneto-optical crystal 40, the birefringent wedge angle piece pair 50, and the second magneto-optical crystal 60 can be conveniently positioned; the structure of the first magneto-optical crystal 40, the birefringent wedge angle piece pair 50, and the second magneto-optical crystal 60 after being attached is approximately a cuboid, the shape thereof matches the shape of the limiting groove 111, the installation space can be effectively utilized, the installation of the magnetic element 110 is facilitated, and space is saved; at the same time, the first wave plate 30 and the second wave plate 70 can be attached to the two ends of the magnetic element 110 for fixation, facilitating installation; after the light beam enters the first polarization beam splitter prism 20, it is divided into two separated light beams with mutually perpendicular polarization states, the first wave plate 30 includes two wave plates, corresponding to the two light beams respectively; similarly, the second wave plate 70 includes two wave plates; the first polarization beam splitter prism 20 and the second polarization beam splitter prism 80 are fixed on the base bar 100;

[0025] The first collimator 10 includes a first optical fiber and a third optical fiber arranged side by side; the second collimator 90 includes a second optical fiber and a fourth optical fiber arranged side by side;

[0026] The first collimator 10 is used to collimate the light from the first optical fiber into a parallel light beam and guide the parallel light beam into the third optical fiber; the second collimator 90 is used to guide the parallel light beam into the second optical fiber and the fourth optical fiber or collimate the light from the second optical fiber into a parallel light beam; the first polarization beam splitter prism 20 and the second polarization beam splitter prism 80 are used to decompose the input light of any state into two polarization components with perpendicular polarization directions or synthesize two polarization components with perpendicular polarization directions into a light beam; the first wave plate 30, the second wave plate 70, the first magneto-optical crystal 40, and the second magneto-optical crystal 60 are used to change the polarization state of the light beam; the birefringent wedge angle piece pair 50 is a polarization-dependent angle deflector.

[0027] In an embodiment, the light from the first optical fiber is collimated into parallel light beams by the first collimator 10, and then sequentially passes through the first polarization beam splitter 20, the first wave plate 30, the first magneto-optical crystal 40, the birefringent wedge angle plate pair 50, the second magneto-optical crystal 60, the second wave plate 70, and the second polarization beam splitter 80, and the transmission direction of the light beams is not changed, and the light beams are received by the second optical fiber. The light from the second optical fiber is collimated into parallel light beams by the second collimator 90, and then sequentially passes through the second polarization beam splitter 80, the second wave plate 70, the second magneto-optical crystal 60, the birefringent wedge angle plate pair 50, and the first magneto-optical crystal 40, and the transmission direction of the light beams is not changed, and then the light beams pass through the first wave plate 30 and the first polarization beam splitter 20, and the light beams are received by the third optical fiber. The light from the third optical fiber is collimated into parallel light beams by the first collimator 10, and then sequentially passes through the first polarization beam splitter 20, the first wave plate 30, the first magneto-optical crystal 40, the birefringent wedge angle plate pair 50, the second magneto-optical crystal 60, the second wave plate 70, and the second polarization beam splitter 80, and the transmission direction of the light beams is not changed, and the light beams are received by the fourth optical fiber.

[0028] In an embodiment, the polarization beam splitter can decompose a light beam with an arbitrary polarization state into two mutually perpendicular polarized light beams and produce an arbitrary size of lateral separation distance in a longitudinal distance small enough, and vice versa, so as to solve the contradiction that the longer the long cross distance of the double-fiber collimator is, the larger the light spot is, and to realize the function of the ring device of the small-spot double-fiber collimator in a small cross distance.

[0029] In an embodiment, by using the above structure, a three-port ring device of the first, second, and third optical fibers can be formed, and a four-port ring device of the first, second, third, and fourth optical fibers can also be formed.

[0030] In an embodiment, the polarization beam splitter can decompose a light beam with an arbitrary polarization state into two mutually perpendicular polarized light beams and produce an arbitrary size of lateral separation distance in a longitudinal distance small enough, and vice versa, so as to solve the contradiction that the longer the long cross distance of the double-fiber collimator is, the larger the light spot is, and to realize the function of the ring device of the small-spot double-fiber collimator in a small cross distance.

[0031] In actual implementation products, the following sizes can be used: the polarization beam splitter has a thickness of 0.5-0.6 mm, the lens has a light spot diameter of about 0.25 mm, and the cross distance of the double-fiber collimator is about 0.6 mm, so that the length of the final ring device component can be about 2.8 mm.

[0032] The above description is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent transformation or direct or indirect application in the related technical field by using the content of the present application is also included in the patent protection range of the present application.

Claims

1. A miniature circulator, characterized in that: It includes a first collimator (10), a circulator component, and a second collimator (90) arranged sequentially along the optical path direction; the circulator component includes a first polarizing beam splitter (20), a first waveplate (30), a first magneto-optical crystal (40), a pair of birefringent wedge plates (50), a second magneto-optical crystal (60), a second waveplate (70), and a second polarizing beam splitter (80) arranged along the optical path direction; the first magneto-optical crystal (40), the pair of birefringent wedge plates (50), and the second magneto-optical crystal (60) cooperate with the limiting groove (111) on the magnetic element (110).

2. The ultra-miniature circulator according to claim 1, characterized in that: The circulator component is mounted on the base strip (100).

3. The ultra-miniature circulator according to claim 2, characterized in that: The angle between the mounting surface of the base strip (100) and the horizontal plane is 4-10°.

4. The ultra-miniature circulator according to claim 3, characterized in that: The mounting surface of the base strip (100) has an angle of 7° with the horizontal plane.

5. The ultra-miniature circulator according to claim 1, characterized in that: The circulator component is provided with a sleeve (120).

6. The ultra-miniature circulator according to claim 1, characterized in that: The magnetic element (110) is inverted U-shaped.

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