Mini polarization maintaining optical fiber isolator device

Abstract

The utility model relates to a mini polarization-maintaining optical fiber isolator device, which comprises two single-mode polarization-maintaining single-light tail fibers, two plano-convex lenses, a mini isolator core, a polaroid, a first glass tube and two second glass tubes. The tail fiber end face of the single-mode polarization-maintaining single-light tail fiber is combined with the plane end of the plano-convex lens in an attached mode. The plano-convex lens and the single-mode polarization-maintaining single-light tail fiber are packaged by the first glass tube, the plano-convex lens and the single-mode polarization-maintaining single-light tail fiber are packaged by the second glass tube to form a single-optical-fiber polarization-maintaining collimator, the polarizing film is attached to the mini isolator core, the mini isolator core is installed on one second glass tube, and the two second glass tubes are combined together by the first glass tube. The mini polarization maintaining optical fiber isolator device is ingenious in structural design, uses mini structural design, compresses the size of the whole device, enables the size of the whole device to be small, saves cost, and enables transmission coupling loss to be small, reverse isolation degree to be large, return loss to be large, extinction ratio to be large and linearity to be strong through optical design.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical communication, CATV, optical amplifier, especially to the field of optical isolator, specifically refers to a mini polarization maintaining optical fiber isolator device. BACKGROUND

[0002] At present, the optical isolator in the prior art is large in size, and most of them do not have the function of maintaining the polarization state of the polarized light, so they cannot be applied to high-precision working scenes that require polarization state, such as communication, radar, measurement and remote sensing fields, to ensure the quality and accuracy of signal transmission. UTILITY MODEL CONTENTS

[0003] The utility model aims at overcoming the above-mentioned shortcomings of the prior art, and provides a mini polarization maintaining optical fiber isolator device which has large reverse isolation, large return loss, strong linearity and wide application range.

[0004] In order to achieve the above-mentioned purpose, the mini polarization maintaining optical fiber isolator device of the utility model is as follows:

[0005] The mini polarization maintaining optical fiber isolator device mainly comprises two single-mode polarization maintaining single optical tail fibers, two plano-convex lenses, a mini isolator core, a polarizer, a first glass tube and two second glass tubes. One end face of one single-mode polarization maintaining single optical tail fiber is combined with one plane end of one plano-convex lens. One plano-convex lens and one single-mode polarization maintaining single optical tail fiber are packaged by one second glass tube to form a single optical fiber polarization maintaining collimator. The device comprises two single optical fiber polarization maintaining collimators. The polarizer is attached to the mini isolator core. The mini isolator core is installed on one second glass tube. The first glass tube combines the two second glass tubes. The two second glass tubes are respectively located at the two ends of the first glass tube. The mini isolator core and the polarizer are located between the two second glass tubes.

[0006] Preferably, the outer diameter of the single-mode polarization maintaining single optical tail fiber is 1.0 mm, the tail fiber end face has a polishing angle of 6 degrees, and is coated with a corresponding anti-reflection film layer.

[0007] Preferably, the plano-convex lens has an outer diameter of 1.0 mm. One end face of the plano-convex lens is a spherical surface with a radius of curvature of 1.0 mm and a length of 2.1 mm. The plano-convex lens is coated with a corresponding anti-reflection film layer. The polishing angle of the other end plane of the plano-convex lens is 6 degrees, and the film layer is coated with a corresponding anti-reflection film layer.

[0008] Preferably, the outer diameter of the mini isolator core is 1.45 mm, and the length is 3 mm.

[0009] Preferably, the polarizer has a light passing direction of 0 degree angle, a length of 0.9mm, and a thickness of 0.9mm.

[0010] Preferably, the first glass tube combines the two collimators and the mini isolator core and the polarizer together, and the first glass tube has an outer diameter of 1.9mm and a length of 14mm.

[0011] Preferably, the second glass tube has an outer diameter of 1.5mm, an inner diameter of 1.0mm, and a length of 5mm.

[0012] The mini polarization maintaining optical fiber isolator device has the advantages of ingenious structure design, mini structure design, compressed overall device volume, small size, cost saving, small transmission coupling loss, large reverse isolation, large return loss, large extinction ratio, high linearity, polarization light maintaining function, and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a structural schematic view of the mini polarization maintaining optical fiber isolator device.

[0014] Figure 2 Fig. 2 is a collimator structural schematic view of the mini polarization maintaining optical fiber isolator device.

[0015] Figure 3 Fig. 3 is a mini isolator core structural schematic view of the mini polarization maintaining optical fiber isolator device.

[0016] REFERENCE NUMERALS:

[0017] 1 single mode polarization maintaining single optical fiber tail fiber

[0018] 2 plano-convex lens

[0019] 3 mini isolator core

[0020] 4 polarizer

[0021] 5 first glass tube

[0022] 6 second glass tube DETAILED DESCRIPTION

[0023] In order to more clearly describe the technical content of the present application, further description will be made in combination with specific embodiments.

[0024] The utility model discloses a mini polarization maintaining optical fiber isolator device, wherein including two single mode polarization maintaining single optical tail fibers 1, two plano -convex lenses 2, a mini isolator core 3, a polaroid 4, a first glass tube 5 and two second glass tubes 6, the tail fiber end face of one single mode polarization maintaining single optical tail fiber 1 and one plano -convex lens 2 plane end adhere combination, one second glass tube 6 encapsulates one plano -convex lens 2 and one single mode polarization maintaining single optical tail fiber 1, and a single optical fiber polarization maintaining collimator is formed, the device includes two single optical fiber polarization maintaining collimators, the polaroid 4 is pasted on the mini isolator core 3, the mini isolator core 3 is installed on one second glass tube 6, the first glass tube 5 combines two second glass tubes 6 together, and the two second glass tubes 6 are located at the both ends of the first glass tube 5 respectively, and the mini isolator core 3 and the polaroid 4 are located between the two second glass tubes 6.

[0025] As a preferred embodiment of the utility model, the outer diameter of the single mode polarization maintaining single optical tail fiber 1 is 1.0mm, the tail fiber end face polishing angle is 6 degrees, and a corresponding antireflection film layer is plated.

[0026] As a preferred embodiment of the utility model, the outer diameter of the plano -convex lens 2 is 1.0mm, one end face of the plano -convex lens 2 is spherical, the curvature radius is 1.0mm, the length is 2.1mm, a corresponding antireflection film layer is plated, and the polishing angle of the other end plane end of the plano -convex lens 2 is 6 degrees, and a corresponding antireflection film layer is plated.

[0027] As a preferred embodiment of the utility model, the outer diameter of the mini isolator core 3 is 1.45mm, and the length is 3mm.

[0028] As a preferred embodiment of the utility model, the polaroid 4 is 0 degrees angle in light transmission direction, and the length is 0.9mm, and the thickness is 0.9mm.

[0029] As a preferred embodiment of the utility model, the first glass tube 5 combines two collimators and the mini isolator core 3 and the polaroid 4 together, the outer diameter of the first glass tube 5 is 1.9mm, and the length is 14mm.

[0030] As a preferred embodiment of the utility model, the outer diameter of the second glass tube 6 is 1.5mm, the inner diameter is 1.0mm, and the length is 5mm.

[0031] In the specific embodiment of the utility model, a mini polarization maintaining optical fiber isolator is disclosed, and the structural diagram is as shown in Figure 1As shown, mainly includes two outer diameter OD1.0mm single mode polarization maintaining single optical tail fiber 1, two outer diameter OD1.0mm Clens flat convex lens 2, a mini isolator core 3, a polarizer 4, size 0.9*0.9mm, two second glass tube 6 OD1.5*ID1.0*L5mm, a first glass tube 5 OD1.9*L14mm.

[0032] The technical scheme adopted by the utility model is:

[0033] 1), contain two outer diameter OD1.0mm single mode polarization maintaining single optical tail fiber 1, tail fiber end face polishing angle 6 degrees and need to be plated with corresponding antireflection film layer.

[0034] 2), contain two outer diameter OD1.0mm Clens flat convex lens 2, one end face is spherical, and the curvature radius is R1.0mm, L2.1mm, plated with corresponding antireflection film layer, and the other end flat end polishing angle is 6 degrees, and also needs to be plated with corresponding antireflection film layer.

[0035] 3), contain two second glass tubes 6, that is, the second glass tube 6 of OD1.3*ID1.0*L5mm, the flat convex lens 2 and the single mode polarization maintaining single optical tail fiber 1 are encapsulated together to make single optical fiber polarization maintaining collimator.

[0036] 4), contain a step type mini isolator core piece 3, and the size is OD1.45*L3mm.

[0037] 5), contain a polarizer 4, and the light transmission direction is 0 degrees, and the size is L0.9*W0.9mm.

[0038] 6), contain a first glass tube 5, that is, the first glass tube 5 of OD1.9*L14mm, two collimators and the mini isolator core piece 3 with the polarizer 4 are combined and fixed together by injecting UV ultraviolet glue at both ends of the first glass tube 5.

[0039] 7), the polarizer 4 is attached to the mini isolator core piece 3 and is sleeved on the incident end collimator, so that the 0-degree light transmission direction of the polarizer 4 can be conveniently selected and adjusted. It is used to realize the additional function of the mini type polarization maintaining optical fiber isolator, and the function is slow axis light transmission and fast axis cut-off, or fast axis light transmission and slow axis cut-off.

[0040] The utility model discloses a mini type polarization maintaining optical fiber isolator, and the outer envelope size can be as small as the outer diameter 1.9 length 14mm. The return loss is large, reaches 60dB above, the polarization state of polarized light can be kept, the function of slow axis light transmission and fast axis cut-off, or fast axis light transmission and slow axis cut-off can be added, the transmission coupling loss is small, can be below 0.5dB, the linearity is strong, and the reverse isolation degree is high, and the peak isolation degree can be above 42dB.

[0041] The following is a specific embodiment of the utility model, 1550nm single-stage mini isolator.

[0042]

[0043] The specific implementation scheme of the embodiment can be referred to the related description in the above embodiment, which will not be repeated here.

[0044] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0045] It should be noted that, in the description of the utility model, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the utility model, unless otherwise specified, the meaning of "multiple" is at least two.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The mini polarization maintaining optical fiber isolator device of the utility model adopts ingenious structure design, uses mini structure design, compresses the overall device volume, makes its size small, saves cost, and through optical design, makes the transmission coupling loss small, the reverse isolation degree large, the echo loss large, the extinction ratio large, and the linearity strong. And has the effect of maintaining polarized light, can increase the slow axis light transmission, fast axis cut-off function or fast axis light transmission, slow axis cut-off function according to customer requirements. It can be widely used in optical fiber network, optical fiber amplifier, optical fiber laser, CATV optical device, optical fiber instrument, optical fiber test, optical signal monitoring and other devices.

[0048] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the specification and drawings should be considered as illustrative rather than limiting.

Claims

1. A mini polarization maintaining optical fiber isolator device, characterized by, The device comprises two single-mode polarization maintaining single fiber, two plano-convex lenses, a mini isolator core, a polarizer, a first glass tube and two second glass tubes, the end face of one single-mode polarization maintaining single fiber and the flat end of one plano-convex lens are combined, one second glass tube encapsulates one plano-convex lens and one single-mode polarization maintaining single fiber, and a single fiber polarization maintaining collimator is formed, the device comprises two single fiber polarization maintaining collimators, the polarizer is attached to the mini isolator core, the mini isolator core is installed on one second glass tube, the first glass tube combines the two second glass tubes, the two second glass tubes are respectively located at the two ends of the first glass tube, and the mini isolator core and the polarizer are located between the two second glass tubes.

2. The mini-PMF isolator device according to claim 1, wherein, The outer diameter of the single-mode polarization maintaining single fiber is 1.0 mm, the polishing angle of the end face of the single-mode polarization maintaining single fiber is 6 degrees, and a corresponding anti-reflection film layer is coated.

3. The mini-PMF isolator device of claim 1, wherein, The outer diameter of the plano-convex lens is 1.0 mm, one end face of the plano-convex lens is a spherical face with a curvature radius of 1.0 mm and a length of 2.1 mm, and a corresponding anti-reflection film layer is coated, the polishing angle of the flat end of the plano-convex lens is 6 degrees, and a corresponding anti-reflection film layer is coated.

4. The mini-PMF isolator device of claim 1, wherein, The outer diameter of the mini isolator core is 1.45 mm, and the length is 3 mm.

5. The mini-PMF isolator device of claim 1, wherein, The light transmission direction of the polarizer is 0 degrees, the length is 0.9 mm, and the thickness is 0.9 mm.

6. The mini-PMF isolator device of claim 1, wherein, The first glass tube combines the two collimators, the mini isolator core and the polarizer, the outer diameter of the first glass tube is 1.9 mm, and the length is 14 mm.

7. The mini-PMF isolator device of claim 1, wherein, The outer diameter of the second glass tube is 1.5 mm, the inner diameter is 1.0 mm, and the length is 5 mm.

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