Non-magnetic space isolator and isolation detection method thereof

Abstract

The invention belongs to the technical field of isolators, and particularly relates to a non-magnetic space isolator and an isolation degree detection method thereof.The non-magnetic space isolator comprises an isolator body, the isolator body comprises a 0-degree polaroid and a 1 / 4 wave plate which are sequentially arranged in the optical axis direction, and the 0-degree polaroid and the 1 / 4 wave plate are bonded and fixed. The isolation degree detection method of the non-magnetic spatial isolator comprises the following steps: step 1, placing a detection sheet on a reflector, adjusting the polarization state of incident light and adjusting the transverse position of a detector to obtain the maximum power P0; and 2, the positions of the incident light and the detector are not changed, the isolator body is used for replacing the detection sheet, the power P1 is measured by the detector, and the isolation P1 / P0 of the isolator body can be obtained. The non-magnetic space isolator is free of a magnetic ring and a Faraday piece, simpler in structure, small in size, low in cost, high in isolation degree and wide in application range.

Description

Technical Field

[0001] The present invention belongs to the technical field of isolators, and more specifically, relates to a non-magnetic spatial isolator and a method for detecting its isolation degree. Background Art

[0002] An optical isolator is an optical device that allows light to be transmitted unidirectionally. Traditional isolators often consist of a magnetic ring, a Faraday plate, a wave plate, a polarizer, etc. The isolator has a high complexity, and the complexity of its structure will reduce the reliability of the isolator to a certain extent. In addition, due to the large number of components included in the traditional isolator, it has a large volume and high cost. Especially, the more components there are, the greater the influence of the error superposition of each component on the isolation degree, and the smaller the applicable range. Its large volume and high price limit the development and application of the isolator. Therefore, it is very necessary to design a non-magnetic spatial isolator and a method for detecting its isolation degree. Summary of the Invention

[0003] The object of the present invention is to design a non-magnetic spatial isolator and a method for detecting its isolation degree. The isolator has no magnetic ring and Faraday plate, and has a simpler structure, lower cost and higher isolation degree while. To achieve the above object, the present invention adopts the following technical solutions:

[0004] A non-magnetic spatial isolator includes an isolator body. The isolator body includes a polarizer and a wave plate arranged in sequence along the optical axis direction. The polarizer is a 0° polarizer, and the wave plate is a 1 / 4 wave plate. The 0° polarizer and the 1 / 4 wave plate are adhesively fixed.

[0005] Preferably, the included angle between the optical axis and the optical axis of the 0° polarizer is 45°.

[0006] Preferably, the 0° polarizer and the 1 / 4 wave plate are adhesively bonded by optical glue.

[0007] The present invention also includes a method for detecting the isolation degree of a non-magnetic spatial isolator, including the following steps:

[0008] Step 1: Place the detection piece on the mirror. One end of the detection piece is padded with a gasket to form an included angle A between the detection piece and the mirror. Shoot incident light into the detection piece, and the incident angle is as small as possible, and detect the reflected light with a detector. Adjust the polarization state of the incident light and the horizontal position of the detector to obtain the maximum power P 0 ;

[0009] Step 2: Keep the incident light and the detector position unchanged. Replace the detection piece with the isolator body. The incident end of the isolator body corresponds to the incident light. The included angle B between the isolator body and the mirror is greater than 8°. The detector measures the power P 1 , and the isolation degree P 1 / P of the isolator body can be obtained0 。

[0010] Preferably, the incident light is linearly polarized collimated light.

[0011] Preferably, the detector is a surface detector.

[0012] Preferably, the detection sheet is attached to the mirror as close as possible, and the included angle A is greater than 8°.

[0013] Preferably, the detection sheet is a 0° polarizer.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The isolator has no magnetic ring and Faraday plate, and has a simpler structure, lower cost and higher isolation degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the basic schematic diagram of a non-magnetic spatial isolator in Embodiment 1;

[0016] Figure 2 It is the isolator degree comparison diagram of different wave plates in Embodiment 1;

[0017] Figure 3 It is the isolator degree detection schematic diagram in Embodiment 2.

[0018] In the figure: 1, polarizer; 2, wave plate; 3, mirror; 4, gasket; 5, detector; 6, detection sheet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solution of the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0020] Embodiment 1

[0021] As Figure 1-2 shown, this embodiment proposes a non-magnetic spatial isolator, including an isolator body, which is composed of a polarizer 1 and a wave plate 2 arranged in sequence along the optical axis direction. The polarizer 1 is a 0° polarizer, the wave plate 2 is a 1 / 4 wave plate, and the 0° polarizer and the 1 / 4 wave plate are bonded and fixed.

[0022] The included angle between the optical axis and the optical transmission axis of the 0° polarizer is 45°.

[0023] The 0° polarizer and the 1 / 4 wave plate are adhesively bonded by optical cement.

[0024] In this embodiment, Figure 1 where θ is the optical axis angle and δ represents the polarization delay δ wave plate,

[0025]

[0026] where Corresponding wave plate, Corresponding polarizer, Corresponding to 0° incident polarized light.

[0027] That is, the wave plate does not affect the differential loss.

[0028]

[0029] To minimize ISO to 0, it is necessary to simultaneously satisfy δ = π / 2 and θ = 45°, that is: To achieve the maximum isolation, a 1 / 4 wave plate is required, and the angle between the optical axis and the transmission axis of the polarizer is 45°.

[0030] Figure 2 It can be seen from [description] that the peak value of the isolation is determined by the angle of the optical axis of the wave plate. The wavelength bandwidth of the isolation (shown by the red and blue dotted lines in the figure) and the temperature drift are restricted by the principle and materials. The wave plate (advanced wave plate) greatly reduces the bandwidth. The narrower the bandwidth, the smaller the wave plate error required to achieve the isolation at a given wavelength. To reduce the influence brought by the error, the 1 / 4 wave plate is adopted in the present invention.

[0031] Example 2

[0032] As Figure 3 shown, the present embodiment proposes a method for detecting the isolation of a non-magnetic spatial isolator, including the following steps:

[0033] Step 1: Place the detection piece 6 on the mirror. The detection piece 6 is a 0° polarizer. One end of the detection piece is padded with a gasket 4. An angle A is formed between the detection piece 1 and the mirror 3. The detection piece is as close as possible to the mirror, and the angle A is greater than 8°. Incident light is incident on the detection piece. The incident light is linearly polarized collimated light, and the incident angle is as small as possible, and the reflected light is detected by a detector 5. The detector 5 is a surface detector. Adjust the polarization state of the incident light and the horizontal position of the detector to obtain the maximum power P 0 ;

[0034] Step 2: With the incident light and the detector position unchanged, replace the detection piece 6 with the isolator body. The incident end of the isolator body corresponds to the incident light. The angle B between the isolator body and the mirror is greater than 8°. The detector measures the power P 1 , and the isolation of the isolator body can be obtained as P 1 / P 0 . It can be detected that the isolation of the non-magnetic spatial isolator is greater than or equal to 35 dB.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A non-magnetic space isolator, comprising an isolator body, wherein the isolator body comprises a polarizer and a wave plate arranged in sequence along an optical axis, characterized in that: The polarizer is a 0° polarizer, and the wave plate is a 1 / 4 wave plate. The 0° polarizer and the 1 / 4 wave plate are bonded and fixed.

2. A non-magnetic space isolator according to claim 1, characterized in that: The angle between the optical axis and the light transmission axis of the 0° polarizer is 45°.

3. A non-magnetic space isolator according to claim 1, characterized in that: The 0° polarizing plate and the 1 / 4 wave plate are bonded by optical adhesive.

4. The isolation degree detection method of the non-magnetic space isolator according to any one of claims 1 to 3, characterized in that: The following steps are included: Step 1: Place the detection sheet on the reflector, form an angle A between the detection sheet and the reflector, inject incident light into the detection sheet, and detect the reflected light with a detector, adjust the polarization state of the incident light and adjust the lateral position of the detector to obtain the maximum power P0; Step 2: The incident light and the detector position remain unchanged, and the detection piece is replaced by the isolator body. The detector measures the power P1, and the isolation degree P1 / P0 of the isolator body can be obtained.

5. The isolation degree detection method of the non-magnetic space isolator according to claim 4, characterized in that: The incident light is linearly polarized collimated light.

6. The isolation degree detection method of the non-magnetic space isolator according to claim 4, characterized in that: The detector is a surface detector.

7. The isolation degree detection method of the non-magnetic space isolator according to claim 4, characterized in that: The angle A is greater than 8°.

8. The isolation degree detection method of the non-magnetic space isolator according to claim 4, characterized in that: The detection plate is a 0° polarizing plate.

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