Single-stage isolator with replaceable tail fiber

By setting connectors and connection components at both ends of the fiber optic isolator, detachable connection of the pigtail is achieved, which solves the problem that the type and length of the pigtail connector cannot be changed in the existing technology, improves the flexibility of the optical path system and reduces the replacement cost.

CN223679396UActive Publication Date: 2025-12-16深圳市飞宇光纤股份有限公司
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Patent Information

Application Number
CN202520266348.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-19
Publication Date
2025-12-16
Estimated Expiration
2035-02-19

AI Technical Summary

Technical Problem

The type and length of the pigtail connectors in existing fiber optic isolators cannot be easily changed, which means that when the equipment is updated, the pigtails need to be cut off and re-attached or new components need to be purchased, reducing the flexibility of the optical path system and increasing the replacement cost.

Method used

Design a single-stage isolator with replaceable pigtails. Connectors are installed at both ends of the isolator to enable detachable connection of the pigtails, and the pigtails can be flexibly replaced through structures such as wedges, ferrules, compression sleeves, and knobs.

Benefits of technology

It improves the flexibility of isolators within the optical path system, reduces the cost of replacing optical components during equipment upgrades, and enhances the system's adaptability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to an optical fiber communication technology, in particular to a single-stage isolator with replaceable tail fibers, which comprises a single-stage isolator body and connectors arranged at two ends of the single-stage isolator body, and the connectors are used for detachably installing the tail fibers at the two ends of the single-stage isolator body. The single-stage isolator body comprises a metal tube shell, single-fiber collimators symmetrically arranged at the two ends of the interior of the metal tube shell, and an isolator core arranged in the center of the interior of the metal tube shell and located between the two single-fiber collimators. The connector is arranged at each of the two ends of the single-stage isolator, so that the tail fiber connected with the single-stage isolator not only can cover various specifications and types, tail fiber lengths and the like, but also can be replaced according to the change of actual application scenes, and the flexibility of the isolator in an optical path system is greatly improved; and the cost caused by replacing the optical device when the equipment is updated is reduced.
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Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of optical fiber communication technology, specifically a single-stage isolator with replaceable tail fiber. BACKGROUND

[0002] Optical fiber isolator is applied to advanced optical fiber communication and optical fiber sensing system, and its role is to prevent the adverse effects of back-transmission light due to various reasons in optical path on light source and optical path system. For example, install optical isolator on both ends of doped optical fiber in optical fiber amplifier, which can improve the working stability of optical fiber amplifier. Without it, back-reflection light will enter the signal source (laser) and cause severe fluctuations in the signal source.

[0003] The existing isolator products are all with tail fiber products, and the length and joint type cannot be easily replaced after joint is installed. To reduce the replacement of joints and length changes caused by equipment updates, it is necessary to cut off the head and add a new head or purchase other joint types or isolators with different lengths. The utility model is intended to replace various joint types and tail fiber lengths at will, greatly increasing the flexibility of isolators in optical path system and reducing the cost of replacing optical devices during equipment updates. SUMMARY

[0004] The utility model aims at providing a single-stage isolator with replaceable tail fiber to solve the problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A single-stage isolator with replaceable tail fiber includes a single-stage isolator body and connectors arranged at both ends of the single-stage isolator body. The connectors are used to detachably install tail fibers at both ends of the single-stage isolator body.

[0007] The single-stage isolator body includes a metal tube shell, single-fiber collimators symmetrically arranged at both ends inside the metal tube shell, and an isolator core arranged in the center inside the metal tube shell and between the two single-fiber collimators.

[0008] A large glass tube is fixedly arranged inside the metal tube shell. The isolator core and the two single-fiber collimators are fixedly arranged in the metal tube shell through the large glass tube.

[0009] The single-stage isolator with replaceable tail fiber as described above includes two plug-in tubes fixedly connecting both ends of the single-fiber collimator, two tail fiber joints, and a sleeve for connecting the tail fiber joints and the plug-in tubes.

[0010] The ferrule and the pigtail joint are fixedly connected, and a connecting assembly is further arranged between the ferrule and the plug-in pipe.

[0011] The replaceable pigtail single-stage isolator as described above: the connecting assembly comprises a wedge block, and the wedge block is matched with a wedge taper opening arranged on the outer periphery of the plug-in pipe.

[0012] A slide is radially arranged on the ferrule, the wedge block is slidably arranged in the slide, one side of the wedge block forms a straight surface, the other side forms a second inclined surface, and a first inclined surface is further arranged on the straight surface; one side of the wedge taper opening is a straight annular surface, and the other side is a tapered surface.

[0013] The replaceable pigtail single-stage isolator as described above: a guide column is fixedly arranged in the ferrule in the radial direction, a push block is slidably arranged on the guide column, and a spring is further embedded in the push block.

[0014] One end of the spring is in contact with the inner wall of the push block, and the other end of the spring is in contact with the guide column.

[0015] The end of the push block away from the guide column forms a third inclined surface, and the third inclined surface is matched with the first inclined surface.

[0016] The replaceable pigtail single-stage isolator as described above: an extrusion sleeve is further arranged outside the plug-in pipe, and the extrusion sleeve is threadedly connected with the ferrule.

[0017] An optical seal is arranged on the inner wall of the extrusion sleeve, and a fourth inclined surface is formed at the end of the extrusion sleeve, and the fourth inclined surface is matched with the second inclined surface.

[0018] The replaceable pigtail single-stage isolator as described above: a knob is further integrally formed on the outer periphery of the extrusion sleeve, and a plurality of convex ribs are protrudingly arranged on the outer periphery of the knob.

[0019] The replaceable pigtail single-stage isolator as described above: one wedge angle piece is arranged on each of the two surfaces of the isolator core, the two wedge angle pieces are arranged side by side, a Faraday piece is arranged between the two wedge angle pieces, and a magnetic ring is arranged on the outer periphery of the Faraday piece.

[0020] The replaceable pigtail single-stage isolator as described above: the single-fiber collimator comprises a spherical lens, a ceramic plug-in core, and a small glass tube arranged in sequence.

[0021] Compared with the prior art, the single-stage isolator in the utility model has the beneficial effects that: the single-stage isolator is provided with a connector at each end, so that the pigtail connected with the single-stage isolator can cover various specifications and lengths of the pigtail, and the pigtail can be replaced according to the change of the actual application scene, greatly increasing the flexibility of the isolator in the optical path system and reducing the cost caused by the replacement of the optical device during equipment updating. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 Front view of the single-stage isolator with replaceable pigtail.

[0023] Figure 2 Internal structure schematic view of the single-stage isolator with replaceable pigtail.

[0024] Figure 3 Structure schematic view of the single optical fiber collimator in the single-stage isolator with replaceable pigtail.

[0025] Figure 4 Structure schematic view of the isolator core in the single-stage isolator with replaceable pigtail.

[0026] Figure 5 Structure schematic view of the single-stage isolator with replaceable pigtail.

[0027] Figure 6 Structure schematic view of the pigtail joint and the connector.

[0028] Figure 7 Structure schematic view of the single-stage isolator with replaceable pigtail. Figure 6 Structure schematic view of the single-stage isolator with replaceable pigtail.

[0029] Figure 8 Front view of the connector.

[0030] Figure 9 Sectional view of the single-stage isolator with replaceable pigtail. Figure 8 Three-dimensional view of the single-stage isolator with replaceable pigtail.

[0031] Figure 10 Structure schematic view of the single-stage isolator with replaceable pigtail. Figure 9 Three-dimensional view of the single-stage isolator with replaceable pigtail.

[0032] Figure 11 Structure schematic view of the single-stage isolator with replaceable pigtail. Figure 10 Structure schematic view of the single-stage isolator with replaceable pigtail.

[0033] Figure 12 Structure schematic view of the extrusion sleeve and the push block.

[0034] Figure 13 Structure schematic view of the single-stage isolator with replaceable pigtail. Figure 12 Structure schematic view of the single-stage isolator with replaceable pigtail.

[0035] In the figure: 1-metal tube shell; 2-single fiber collimator; 21-spherical lens; 22-ceramic ferrule; 23-small glass tube; 3-large glass tube; 4-isolator core; 41-wedge angle piece; 42-faraday piece; 43-magnetic ring; 5-connector; 501-plug tube; 5011-wedge taper; 502-sleeve; 5021-slide; 5022-guide groove; 5023-guide column; 503-extrusion sleeve; 504-enclosing aperture; 505-wedge block; 5051-straight surface; 5052-first inclined surface; 5053-second inclined surface; 506-push block; 507-spring; 6-tail fiber joint. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0037] Please refer to Figures 1-13 As an embodiment of the utility model, the single-stage isolator with replaceable tail fiber comprises a single-stage isolator body and connectors 5 arranged at both ends of the single-stage isolator body, and the connectors 5 are used for detachably mounting tail fibers at both ends of the single-stage isolator body.

[0038] The single-stage isolator body comprises a metal tube shell 1, single fiber collimators 2 symmetrically arranged at both ends inside the metal tube shell 1, and an isolator core 4 arranged in the center inside the metal tube shell 1 and between the two single fiber collimators 2.

[0039] The metal tube shell 1 is made of stainless steel, the single fiber collimator 2 is used for collimating a small-mode-field light beam transmitted in an optical fiber into a large-mode-field light beam for transmission over a longer distance.

[0040] In addition, a large glass tube 3 is fixedly arranged inside the metal tube shell 1, and the isolator core 4 and the two single fiber collimators 2 are fixedly arranged in the metal tube shell 1 through the large glass tube 3, that is, the large glass tube 3 plays a role of a connecting bridge, and specifically, the large glass tube 3 is made of high borosilicate material.

[0041] The isolator core 4 is a core element of the product and plays a role of forward light transmission and reverse isolation.

[0042] In this embodiment, the single-stage isolator in the utility model is provided with a connector 5 at each end, so that the tail fiber connected to the single-stage isolator can cover various specifications, types and tail fiber lengths, and the tail fiber can be replaced according to the change of the actual application scene, greatly increasing the flexibility of the isolator in the optical path system and reducing the cost caused by the replacement of optical devices during equipment updating.

[0043] As a further scheme of the utility model, the connector 5 includes two plug-in tubes 501 fixedly connected with both ends of the single-fiber collimator 2, two pigtail connectors 6, and a sleeve 502 for connecting the pigtail connector 6 and the plug-in tube 501.

[0044] The sleeve 502 and the pigtail connector 6 are fixedly connected, and a connecting assembly is further arranged between the sleeve 502 and the plug-in tube 501.

[0045] In this embodiment, the connecting assembly can not only realize detachable connection between the plug-in tube 501 and the pigtail connector 6, but also can replace pigtails of different models and lengths according to actual needs.

[0046] As a further scheme of the utility model, the connecting assembly includes a wedge block 505, the wedge block 505 is matched with a wedge taper opening 5011 arranged on the outer periphery of the plug-in tube 501.

[0047] A slide 5021 is radially arranged on the sleeve 502, the wedge block 505 is slidably arranged in the slide 5021, one side of the wedge block 505 forms a straight surface 5051, the other side forms a second inclined surface 5053, and a first inclined surface 5052 is further arranged on the straight surface 5051; one side of the wedge taper opening 5011 is a straight annular surface, and the other side is a tapered surface.

[0048] In this embodiment, when the plug-in tube 501 is completely inserted into the sleeve 502, the wedge block 505 is embedded into the wedge taper opening 5011, at this time, the tapered surface and the straight surface 5051 are matched, so that the plug-in tube 501 cannot be pulled out of the sleeve 502.

[0049] As a further scheme of the utility model, a guide column 5023 is fixedly arranged in the sleeve 502 in the radial direction, a push block 506 is slidably arranged on the guide column 5023, and a spring 507 is further embedded in the push block 506.

[0050] One end of the spring 507 abuts against the inner wall of the push block 506, and the other end abuts against the guide column 5023.

[0051] The end of the push block 506 away from the guide column 5023 forms a third inclined surface, and the third inclined surface is matched with the first inclined surface 5052.

[0052] In this embodiment, since the spring 507 is kept in a compressed state, the push block 506 has been continuously given a pushing force, thus, under the pushing force of the push block 506, the first inclined surface 5052 is always kept given a pushing force by the third inclined surface of the end head, and the first inclined surface 5052, under the pushing force of the third inclined surface, makes the wedge block 505 always have an inward force along the slide 5021.

[0053] As a further scheme of the utility model, the outside of the plug pipe 501 is further provided with an extrusion sleeve 503, the extrusion sleeve 503 is screw connected with the clamping sleeve 502;

[0054] An optical seal 504 is arranged on the inner wall of the extrusion sleeve 503, and a fourth inclined surface is formed at the end head of the extrusion sleeve 503, which cooperates with the second inclined surface 5053.

[0055] In this embodiment, the fourth inclined surface continuously approaches the wedge block 505 by rotating the extrusion sleeve 503, when the fourth inclined surface at the end of the extrusion sleeve 503 is attached to the second inclined surface 5053, the fourth inclined surface continuously extrudes the second inclined surface 5053 by continuously rotating the extrusion sleeve 503, which can make the wedge block 505 slide outward along the slide 5021; in the process of the wedge block 505 sliding outward, the first inclined surface 5052 acts on the fourth inclined surface, so that the push block 506 continuously moves away from the extrusion sleeve 503, and the spring 507 is further compressed; in this way, the wedge block 505 can be separated from the wedge taper opening 5011.

[0056] As a further scheme of the utility model, a knob is integrally arranged on the outer periphery of the extrusion sleeve 503, and a ring of convex ribs is arranged on the outer periphery of the knob.

[0057] In this embodiment, the knob can be rotated to drive the extrusion sleeve 503 to rotate, and the convex ribs can increase the friction between the fingers and the knob.

[0058] As a further scheme of the utility model, one wedge angle piece 41 is arranged on each side of the isolator core 4, the two wedge angle pieces 41 are arranged side by side, a Faraday sheet 42 is arranged between the two wedge angle pieces 41, and a magnetic ring 43 is arranged on the outer periphery of the Faraday sheet 42.

[0059] In this embodiment, the wedge angle piece 41 is made of lithium niobate crystal, the wedge angle is 13 degrees, the optical axis is in the light transmission right angle surface, and the optical axis forms an angle of 22.5 degrees with the right angle side; the thickness of the Faraday sheet 42 changes with the working wavelength, the Faraday sheet 42 rotates linearly polarized light by 45 degrees, and the magnetic ring 43 is made of samarium cobalt, which provides a magnetic field for the Faraday sheet 42 to work.

[0060] As a further scheme of the utility model, the single optical fiber collimator 2 comprises a spherical lens 21, a ceramic ferrule 22 and a small glass tube 23 arranged in sequence.

[0061] In the embodiment, the light beam is refracted by the spherical curvature of the spherical lens 21, so that the light beam is collimated or focused, one end 8-degree bevel, one end spherical, and both ends are coated with an anti-reflection film; the ceramic ferrule 22 is of an APC structure, the end face angle is 8°, and the inside has an optical fiber for butt joint with the spherical lens 21; the small glass tube 23 is used for packaging the spherical lens 21 and the ceramic ferrule 22 at both ends.

[0062] The above embodiment is exemplary but not restrictive, so that the technical scheme of the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model, and is included in the utility model.

Claims

1. A single-stage isolator with a replaceable pigtail, characterized by, The replaceable tail fiber single-stage isolator comprises a single-stage isolator body and connectors (5) arranged at both ends of the single-stage isolator body, the connectors (5) being used for detachably mounting tail fibers at both ends of the single-stage isolator body; The single-stage isolator body comprises a metal tube shell (1), single-fiber collimators (2) symmetrically arranged at both ends inside the metal tube shell (1), and an isolator core (4) arranged centrally inside the metal tube shell (1) and between the two single-fiber collimators (2); A large glass tube (3) is fixedly arranged inside the metal tube shell (1), and the isolator core (4) and the two single-fiber collimators (2) are fixedly arranged in the metal tube shell (1) through the large glass tube (3).

2. The single-stage isolator with replaceable pigtail according to claim 1, wherein, The connectors (5) comprise two plug-in tubes (501) fixedly connected at both ends of the single-fiber collimators (2), two tail fiber joints (6), and a sleeve (502) used for connecting the tail fiber joints (6) and the plug-in tubes (501); The sleeve (502) and the tail fiber joint (6) are fixedly connected, and a connecting assembly is further arranged between the sleeve (502) and the plug-in tube (501).

3. A single stage isolator with replaceable pigtail according to claim 2, wherein, The connecting assembly comprises a wedge block (505), and the wedge block (505) is matched with a circle of wedge taper openings (5011) formed on the outer periphery of the plug-in tube (501); A slide (5021) is formed on the sleeve (502) in the radial direction, the wedge block (505) is slidingly arranged in the slide (5021), one face of the wedge block (505) forms a straight face (5051), the other face forms a second inclined face (5053), and a first inclined face (5052) is further arranged on the straight face (5051); one face of the wedge taper opening (5011) is a straight annular face, and the other face is a tapered face.

4. The single-stage isolator with replaceable pigtail of claim 3, wherein, A guide column (5023) is fixedly arranged in the sleeve (502) in the radial direction, a push block (506) is slidingly arranged on the guide column (5023), and a spring (507) is further embedded in the push block (506); One end of the spring (507) is in contact with the inner wall of the push block (506), and the other end of the spring (507) is in contact with the guide column (5023); The end of the push block (506) away from the guide column (5023) forms a third inclined face, and the third inclined face is matched with the first inclined face (5052).

5. A single stage isolator with replaceable pigtail according to claim 4, wherein, An extrusion sleeve (503) is further arranged outside the plug-in tube (501), and the extrusion sleeve (503) is threadedly connected with the sleeve (502); An optical seal (504) is arranged on the inner wall of the extrusion sleeve (503), and a fourth inclined face is formed at the end of the extrusion sleeve (503), and the fourth inclined face is matched with the second inclined face (5053).

6. A single stage isolator with replaceable pigtail according to claim 5, wherein, A knob is integrally formed on the outer periphery of the extrusion sleeve (503), and a circle of convex ribs is protrusively arranged on the outer periphery of the knob.

7. The single-stage isolator with replaceable pigtail of claim 1, wherein, Two wedge angle sheets (41) are arranged on two sides of the isolator core (4) respectively, the two wedge angle sheets (41) are arranged side by side, and a Faraday sheet (42) is arranged between the two wedge angle sheets (41), and a magnetic ring (43) is arranged on the outer periphery of the Faraday sheet (42).

8. The single-stage isolator with replaceable pigtail of claim 1, wherein, The single-fiber collimator (2) comprises a spherical lens (21), a ceramic ferrule (22) and a small glass tube (23) arranged in sequence.