Isolation measuring device for optical isolator

Abstract

The utility model discloses an optical isolator isolation measuring device, which comprises a connecting rod, the connecting rod is provided with a bottom plate, a first support plate, a second support plate and a third support plate from bottom to top in sequence, the bottom plate is provided with a reflector, the first support plate is provided with an optical isolator, and the second support plate is provided with a depolarization splitting prism; one end of the first supporting plate is rotatably sleeved with the connecting rod, a light source is arranged on the third supporting plate, and the power meter is located on the second supporting plate. The connecting rod is rotatably sleeved with the first supporting plate, the optical isolator located on the first supporting plate is separated from the light path of emergent light of the light source, the purpose of taking away the optical isolator from the light path is achieved, and operation is easy and convenient. Meanwhile, when the optical isolator is replaced and installed, the optical isolator is rotated to the outer side of the whole measuring device through the first supporting plate, so that a larger operation space is provided, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of optical element manufacturing, and particularly to a device for measuring the isolation degree of an optical isolator. Background Art

[0002] A Faraday optical isolator is a passive optical device that only allows unidirectional light to pass through. Its working principle is based on the non-reciprocity of the Faraday rotation. The light reflected by the fiber echo can be well isolated by the optical isolator. The optical isolator mainly uses the Faraday effect of the magneto-optical crystal to achieve the isolation of the reflected light. The optical isolator has the characteristics of low forward insertion loss, high reverse isolation degree, and high return loss.

[0003] The isolation degree is the most important index of the Faraday optical isolator. Therefore, whether the isolator can accurately measure the isolation degree is the key to testing the performance of the optical isolator. The measurement method of the isolation degree is mainly to measure the ratio of the retroreflected light after the light passes through the isolator to the retroreflected light without passing through the isolator. However, the existing isolation degree measurement devices are relatively complex in structural design. Summary of the Invention

[0004] The purpose of the utility model is to provide a device for measuring the isolation degree of an optical isolator for the problems existing in the prior art. The structural design of the utility model is simple, and the isolation degree of the optical isolator can be conveniently measured.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A device for measuring the isolation degree of an optical isolator includes a connecting rod. A bottom plate, a first support plate, a second support plate, and a third support plate are sequentially arranged on the connecting rod from bottom to top. A reflecting mirror is arranged on the bottom plate. An optical isolator is arranged on the first support plate. A depolarizing beam splitter prism is arranged on the second support plate. The optical paths of the depolarizing beam splitter prism, the optical isolator, and the reflecting mirror are coaxial. One end of the first support plate is rotatably sleeved on the connecting rod. A light source is arranged on the third support plate. The light emitted by the light source passes through the depolarizing beam splitter prism. The light emitted from the depolarizing beam splitter prism reaches the reflecting mirror via the optical isolator and then returns along the original path to the depolarizing beam splitter prism. A power meter is arranged on the reflection optical path of the depolarizing beam splitter prism, and the power meter is located on the second support plate.

[0007] In the above technical solution, the optical power meter records the optical power before and after the light passes through the optical isolator, and calculates the ratio of the two optical powers to obtain the isolation degree of the optical isolator. By sleeving the first support plate on the connecting rod, the first support plate can rotate around the connecting rod. When the first support plate is rotated, the optical isolator on the first support plate is separated from the optical path of the light emitted by the light source, achieving the purpose of removing the optical isolator from the optical path, and the operation is simple and convenient. At the same time, when replacing and installing the optical isolator, the optical isolator is rotated to the outside of the whole measuring device through the first support plate, thereby providing a larger operating space and improving work efficiency. The measuring device of the present utility model has a simple structural design and is easy to operate.

[0008] Further, the connecting rod is provided with a limiting groove, and a limiting block is arranged on the inner wall of one end of the first support plate connected to the connecting rod. The limiting block is located in the limiting groove. By the limiting block abutting against the side wall of the limiting groove, the rotation limit of the first support plate is realized. The setting of the positions of the limiting groove and the limiting block ensures that when the first support plate rotates to the extreme position, the optical isolator on the first support plate and the depolarizing beam splitter prism and the mirror arranged in the measuring device are in the coaxial position of the optical path, ensuring the accuracy of the measurement.

[0009] Further, the arc length range of the limiting groove is 1 / 5 to 1 / 3 of the circumference of the connecting rod, ensuring that the first support plate has a certain rotation space, enabling the first support plate to rotate to the outside of the measuring device, generating a larger operating space and being convenient for operation.

[0010] Further, a connecting plate is arranged on the first support plate, and a fixing ring is connected to the connecting plate. The optical isolator can be fixed through the fixing ring. At the same time, bolts for adjusting the ring diameter size are arranged on the fixing ring, which can be suitable for optical isolators of different sizes.

[0011] Further, a plurality of limiting seats are arranged on the second support plate, a limiting rod is sleeved on the limiting seat, and a screw rod is also arranged on the limiting seat. The screw rod abuts against the limiting rod. By the screw rod pressing against the limiting rod, the limiting rod restricts the movement of the depolarizing beam splitter prism. At the same time, by moving the limiting rod, different sizes of depolarizing beam splitter prisms can be adapted.

[0012] Further, a second through hole is arranged on the second support plate, and a first through hole is arranged on the first support plate. The first through hole and the second through hole are coaxially arranged. The first through hole and the second through hole facilitate the passage of light.

[0013] Further, an installation groove is provided on the bottom plate, and the installation groove is used for installing the mirror. The position of the mirror is positioned through the installation groove.

[0014] Further, a light-shielding curtain is provided on the third support plate. The light-shielding curtain is used to prevent external light from affecting the test results.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. By sleeving the first support plate on the connecting rod, the first support plate can rotate around the connecting rod. When the first support plate is rotated, the optical isolator located on the first support plate is disengaged from the optical path of the light emitted by the light source, achieving the purpose of removing the optical isolator from the optical path, and the operation is simple and convenient. At the same time, when replacing and installing the optical isolator, the optical isolator is rotated to the outside of the overall measuring device through the first support plate, thereby providing a larger operation space and improving the work efficiency. The measuring device of the present utility model has a simple structure design and convenient operation.

[0017] 2. The optical isolator can be fixed by the fixing ring. At the same time, bolts for adjusting the ring diameter size are provided on the fixing ring, which can be applicable to optical isolators of different sizes.

[0018] 3. By tightening the limiting rod with the screw rod, the limiting rod restricts the movement of the depolarizing beam splitter prism. At the same time, different sizes of depolarizing beam splitter prisms can be adapted by moving the limiting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the front view of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0020] Figure 2 is the side view of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0021] Figure 3 is the side sectional view of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0022] Figure 4 is the internal optical path schematic diagram of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0023] Figure 5 is the top view of the first support plate of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0024] Figure 6 is the top view of the second support plate of a measuring device for the isolation degree of an optical isolator of the present utility model;

[0025] Figure 7This is an optical path schematic diagram of the measurement principle of an isolation degree measurement device for an optical isolator of the present utility model.

[0026] In the figure: 1. Connecting rod; 101. Limiting groove; 102. First connecting rod; 103. Second connecting rod; 2. Bottom plate; 201. Installation groove; 3. First support plate; 301. First through hole; 302. Limiting block; 4. Second support plate; 401. Second through hole; 5. Third support plate; 6. Power meter; 7. Depolarization beam splitter prism; 8. Reflecting mirror; 9. Optical isolator; 10. Connecting plate; 11. Fixed ring; 12. Light source; 13. Limiting seat; 14. Limiting rod. Specific implementation manners

[0027] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0029] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] Next, in combination with Figures 1 to 7 , through specific embodiments and their application scenarios, a detailed description will be given to an isolation degree measurement device for an optical isolator provided by the embodiments of the present utility model.

[0031] An optical isolator isolation measurement device includes a connecting rod 1. From bottom to top, the connecting rod 1 is successively provided with a bottom plate 2, a first support plate 3, a second support plate 4, and a third support plate 5. A reflecting mirror 8 is arranged on the bottom plate 2, an optical isolator 9 is arranged on the first support plate 3, and a depolarizing beam splitter prism 7 is arranged on the second support plate 4. The optical paths of the depolarizing beam splitter prism 7, the optical isolator 9, and the reflecting mirror 8 are coaxial. One end of the first support plate 3 is rotatably sleeved with the connecting rod 1. A light source 12 is arranged on the third support plate 5. The light emitted by the light source 12 passes through the depolarizing beam splitter prism 7. The light emitted from the depolarizing beam splitter prism 7 reaches the reflecting mirror 8 via the optical isolator 9 and then returns along the original path to the depolarizing beam splitter prism 7. A power meter 6 is arranged on the reflection optical path of the depolarizing beam splitter prism 7, and the power meter 6 is located on the second support plate 4.

[0032] It should be noted that, as Figure 4 and Figure 7 shown, the measurement principle of the optical isolator isolation measurement device of the present utility model is as follows: The light emitted by the light source 12 passes through the depolarizing beam splitter prism 7. The light emitted from the depolarizing beam splitter prism 7 reaches the reflecting mirror 8 via the optical isolator 9 and then returns along the original path to the depolarizing beam splitter prism 7. The depolarizing beam splitter prism 7 reflects the light to the power meter 6, and the power meter 6 measures the light power at this time. This light power is denoted as Pout. Remove the optical isolator 9. The light emitted by the light source 12 passes through the depolarizing beam splitter prism 7. The light emitted from the depolarizing beam splitter prism 7 reaches the reflecting mirror 8 and then returns along the original path to the depolarizing beam splitter prism 7. The depolarizing beam splitter prism 7 reflects the light to the power meter 6, and the power meter 6 measures the light power at this time as Pin. Using the calculation formula , the isolation degree of the measured optical isolator 9 is obtained . Among them, the optical isolator 9 is composed of a Faraday rotator and polarization beam splitters arranged on both sides. When measuring the first light power Pout, it is necessary to ensure that one of the polarization beam splitters is fixed, and adjust the other polarization beam splitter to make the reading of the power meter 6 reach the minimum value. At this time, the recorded light power Pout is the minimum value.

[0033] Specifically, as Figure 1 , Figure 2 and Figure 3As shown in the figure, the connecting rod 1 is fixedly connected above the bottom plate 2. The connecting rod 1 includes a first connecting rod 102 and a second connecting rod 103. Both the first connecting rod 102 and the second connecting rod 103 are round rods. The diameter of the cross-section of the first connecting rod 102 is larger than that of the cross-section of the second connecting rod 103, so as to prevent the first support plate 3 from sliding down when the first support plate 3 is sleeved. The first connecting rod 102 and the second connecting rod 103 are fixedly connected coaxially. One end of the third support plate 5 is fixedly connected to the connecting rod 1, and the light source 12 is arranged on the third support plate 5. One end of the second support plate 4 is fixedly connected to the connecting rod 1, and a depolarizing beam splitter prism 7 is arranged at the other end. A reflecting mirror 8 is arranged on the bottom plate 2. The first support plate 3 is sleeved on the connecting rod 1, so that the first support plate 3 can rotate around the connecting rod 1. When performing the second optical power measurement, rotating the first support plate 3 can achieve the purpose of removing the optical isolator 9 from the optical path, and the operation is simple and convenient. At the same time, when replacing and installing the optical isolator 9, the optical isolator 9 is rotated to the outside of the whole measuring device through the first support plate 3, thereby providing a larger operating space and improving the work efficiency.

[0034] Further, as Figure 5 shown, the connecting rod 1 is provided with a limiting groove 101. The limiting groove 101 is arranged along the circumferential side of the first connecting rod 1. A limiting block 302 is arranged on the inner wall of the end of the first support plate 3 connected to the connecting rod 1. The limiting block 302 is located in the limiting groove 101. By abutting the limiting block 302 against the side wall of the limiting groove 101, the rotational limit of the first support plate 3 is realized. The arrangement of the positions of the limiting groove 101 and the limiting block 302 ensures that when the first support plate 3 rotates to the limit position, the optical isolator 9 located on the first support plate 3 and the depolarizing beam splitter prism 7 and the reflecting mirror 8 arranged in the measuring device are in the coaxial position of the optical path, ensuring the accuracy of the measurement.

[0035] Further, as Figure 5 shown, the arc length range of the limiting groove 101 is 1 / 5 - 1 / 3 of the circumference of the connecting rod 1. Preferably, the range of the limiting groove 101 is 1 / 4 of the circumference of the connecting rod 1, ensuring that the first support plate 3 has a certain rotational space, enabling the first support plate to rotate to the outside of the measuring device, generating a larger operating space and facilitating the operation.

[0036] Further, as Figure 5 shown, a connecting plate 10 is arranged on the first support plate 3, and a fixing ring 11 is connected to the connecting plate 10. The optical isolator 9 can be fixed through the fixing ring 11. At the same time, bolts for adjusting the ring diameter are arranged on the fixing ring 11, and different sizes of optical isolators 9 can be adapted by adjusting the ring diameter.

[0037] Further, as Figure 1 、 Figure 3 and Figure 6As shown in the figure, four limit seats 13 are provided on the second support plate 4. The four limit seats 13 are symmetrically arranged around. A limit rod 14 is sleeved on the limit seat 13. A screw rod is threadedly connected to the upper end of the limit seat 13. By rotating the screw rod, the screw rod can be abutted against the limit rod 14, thereby restricting the movement of the limit rod 14. When the depolarizing beam splitter prism 7 is placed between the four limit seats 13, the limit rod 14 abuts against the periphery of the depolarizing beam splitter prism 7, thereby restricting the movement of the depolarizing beam splitter prism 7. At the same time, by moving the position of the limit rod 14, depolarizing beam splitter prisms 7 of different sizes can be adapted, improving the adaptability of the device.

[0038] Further, as Figure 3 shown, a second through hole 401 is provided on the second support plate 4, and a first through hole 301 is provided on the first support plate 3. The first through hole 301 and the second through hole 401 are coaxially arranged, facilitating the passage of light through the first through hole 301 and the second through hole 401.

[0039] Further, as Figure 3 shown, an installation groove 201 is provided on the bottom plate 2. The installation groove 201 is used to install the mirror 8, and the position of the mirror 8 is positioned through the installation groove 201.

[0040] Further, a light-shielding curtain is provided on the third support plate 5. One end of the light-shielding curtain is connected to the third support plate 5. When testing, the light-shielding curtain is lowered to avoid the influence of external light on the test results through the light-shielding curtain.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical isolator isolation measurement device, comprising a connecting rod (1), wherein a bottom plate (2), a first support plate (3), a second support plate (4), and a third support plate (5) are sequentially arranged on the connecting rod (1) from bottom to top, and it is characterized in that, A mirror (8) is provided on the bottom plate (2), an optical isolator (9) is provided on the first support plate (3), a depolarizing beam splitter prism (7) is provided on the second support plate (4), and the optical paths of the depolarizing beam splitter prism (7), the optical isolator (9) and the mirror (8) are coaxial; one end of the first support plate (3) is rotatably sleeved with the connecting rod (1), a light source (12) is provided on the third support plate (5), the light emitted by the light source (12) passes through the depolarizing beam splitter prism (7), the light emitted from the depolarizing beam splitter prism (7) reaches the mirror (8) via the optical isolator (9) and then returns along the original path to the depolarizing beam splitter prism (7), a power meter (6) is provided on the reflection optical path of the depolarizing beam splitter prism (7), and the power meter (6) is located on the second support plate (4).

2. The isolator isolation measurement device according to claim 1, wherein The connecting rod (1) is provided with a limiting groove (101), and a limiting block (302) is provided on the inner wall of the end of the first support plate (3) connected to the connecting rod (1), and the limiting block (302) is located in the limiting groove (101).

3. The isolator isolation measurement device according to claim 2, wherein, The arc length range of the limiting groove (101) is 1 / 5 to 1 / 3 of the circumference of the connecting rod (1).

4. The optical isolator isolation measurement device according to claim 1, wherein, A connecting plate (10) is provided on the first support plate (3), and a fixing ring (11) is connected to the connecting plate (10).

5. A light isolator isolation measurement device according to claim 1, characterized in that, A plurality of limiting seats (13) are provided on the second support plate (4), a limiting rod (14) is sleeved on the limiting seats (13), and a screw is further provided on the limiting seats (13), and the screw abuts against the limiting rod (14).

6. The optical isolator isolation measurement device according to claim 1, characterized in that A second through hole (401) is provided on the second support plate (4), a first through hole (301) is provided on the first support plate (3), and the first through hole (301) and the second through hole (401) are coaxially arranged.

7. The optical isolator isolation measurement device according to claim 1, characterized in that, An installation groove (201) is provided on the bottom plate (2), and the installation groove (201) is used for installing the mirror (8).

8. A light isolator isolation measurement device according to claim 1, characterized in that A light-shielding curtain is provided on the third support plate (5).

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