Single-ended visible light and near-infrared optical fiber circulator

Abstract

The utility model discloses a single-ended visible light and near-infrared optical fiber circulator which is characterized in that a three-optical-fiber collimation optical fiber is provided with three fiber cores, one end of the three-optical-fiber collimation optical fiber penetrates into one end of a first connecting pipe, and a walking-off wafer is arranged at one end of the three-optical-fiber collimation optical fiber; the 1 / 2 wave plates are in one-to-one correspondence with the three fiber cores and are arranged at one end, far away from the three-optical-fiber collimating optical fiber, of the walking-off wafer; one end of the collimating lens is sleeved in the other end of the first connecting pipe, and the other end of the collimating lens extends into one end of the second connecting pipe; the other end of the first connecting pipe is in spherical fit with one end of the second connecting pipe; the collimating lens is made of magneto-optical crystals or magneto-optical glass of visible light and infrared bands, the reflectors are arranged at the light-emitting end of the collimating lens at intervals, and the distance between the light-emitting surface of the collimating lens and the three-optical-fiber collimating light intersection overlapping area is equal to the length of the sum of the optical paths of the collimating lens and the reflectors; the end face of the other end of the second connecting pipe is provided with a total reflection mirror used for reflecting optical signals emitted by the collimating lens. The device is low in manufacturing cost and simple in structure.

Description

Technical Field

[0001] The utility model relates to the field of lasers, in particular to a single-ended visible light and near-infrared optical fiber circulator. Background Art

[0002] With the increasing development of the optical communication industry, consumers are increasingly looking forward to black technology. For components, miniaturization and high performance are the expected development direction. At the same time, there are more expectations for the functional adjustability of components. People rarely make visible light circulators, and even fewer make visible light fiber circulators. Therefore, there are only a few visible light products on the market with high prices. Summary of the invention

[0003] The utility model aims to provide a single-ended visible light and near-infrared optical fiber circulator.

[0004] The technical solution adopted by the utility model is:

[0005] A single-ended visible light and near-infrared optical fiber circulator comprises a first connecting tube, a second connecting tube, and a three-fiber collimating optical fiber, a walk-off wafer, a 1 / 2 wave plate, a collimating lens, an optical lens and a reflector arranged in sequence; the three-fiber collimating optical fiber has three fiber cores for transmitting optical signals, one end of the three-fiber collimating optical fiber is inserted into one end of the first connecting tube, The walk-off chip is arranged at one end of the three-fiber collimating fiber; the 1 / 2 wave plate is arranged at the end of the walk-off chip away from the three-fiber collimating fiber, and corresponds to the three fiber cores of the three-fiber collimating fiber one by one; one end of the collimating lens is sleeved in the other end of the first connecting tube, and the other end of the collimating lens extends into one end of the second connecting tube; the other end of the first connecting tube is spherically matched with one end of the second connecting tube; the collimating lens is made of magneto-optical crystal or magneto-optical glass in the visible light and infrared bands, the optical lenses are arranged at intervals at the light-emitting end of the collimating lens, and the distance between the light-emitting surface of the collimating lens and the intersection and overlap area of ​​the three-fiber collimating light is equal to the length of the sum of the optical paths of the collimating lens and the optical lens; a total reflection mirror is arranged on the end face of the other end of the second connecting tube, and the total reflection mirror is used to reflect the light signal emitted by the collimating lens.

[0006] Furthermore, the three cores of the three-fiber collimator are arranged side by side; the walk-off chip and the 1 / 2 wave plate are sequentially bonded to the ends of the three-fiber collimator.

[0007] Furthermore, the optical lens is a Wollaston prism or a birefringent crystal wedge.

[0008] Furthermore, it also includes a magnetic ring, which is sleeved on the outer circumference of the first connecting tube and the second connecting tube. The magnetic ring is located on the circumference of the collimating lens and provides magnetism to the collimating lens.

[0009] Furthermore, the 1 / 2 wave plate is a three-piece structure, which can be a plurality of optical sheets that are optically bonded, deepened optically bonded, or glued with a corresponding light conductivity to a corresponding thickness, and then cut by a slicer according to preset specifications, that is, a one-time preparation is completed without the need to set the patches on the walk-off crystal separately. After cutting, the smaller parts can be glued together by arranging their sides side by side. The processing cost of this method is extremely low, and it greatly facilitates the assembly and processing of the circulator.

[0010] Furthermore, the fiber end face of the middle fiber of the three-fiber collimating fiber is plated with a high-reflection film or engraved with a reflection grating to form a high-isolation double-stage isolator.

[0011] The utility model adopts the above technical solution, using TEC optical fiber or a three-fiber head with a large mode field diameter, a walk-off chip and a 1 / 2 wave plate combination block, a collimating lens, a TGG crystal or magneto-optical glass, a birefringent crystal wedge or a wedge pair, a reflector, and a strong magnetic field magnetic ring. The utility model adopts the above technical solution, and the distance between the light-emitting surface of the collimating lens and the intersection and overlap area of ​​the three-fiber collimated light is equivalent to the total path length of the TGG crystal and the crystal wedge, and the reflective microplate is at the light-emitting end of the crystal wedge. The microlens of this patent can be directly made of magneto-optical crystal and magneto-optical glass, and the length of the microlens is the length of the required magneto-optical crystal. The magnetic ring is directly sleeved on the glass tube sleeve of the collimator. The utility model adopts the above technical solution to reflect the middle optical fiber light back, thereby making a double-stage isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods;

[0013] Figure 1 The utility model is a schematic structural diagram of a single-ended visible light and near-infrared optical fiber circulator. Implementation

[0014] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0015] like Figure 1As shown, the utility model discloses a single-ended visible light and near-infrared optical fiber circulator, which comprises a first connecting tube 2, a second connecting tube 6, and a three-fiber collimating optical fiber 1, a walk-off chip 3 (work-off crystal slice), a 1 / 2 wave plate 4, a collimating lens 5, an optical lens 7 and a reflector 9 which are arranged in sequence; the three-fiber collimating optical fiber 1 has three fiber cores for transmitting optical signals, one end of the three-fiber collimating optical fiber 1 penetrates into one end of the first connecting tube 2, the walk-off chip 3 (work-off crystal slice) is arranged corresponding to one end of the three-fiber collimating optical fiber 1; the 1 / 2 wave plate 4 is arranged away from the walk-off chip 3 (work-off crystal slice) and the three-fiber collimating optical fiber 1 is arranged. One end of the optical fiber 1 is connected to the optical fiber 1, and corresponds to the three cores of the three-fiber collimating optical fiber 1 one by one; one end of the collimating lens 5 is sleeved in the other end of the first connecting tube 2, and the other end of the collimating lens 5 extends into one end of the second connecting tube 6; the other end of the first connecting tube 2 is spherically matched with one end of the second connecting tube 6; the collimating lens 5 is made of magneto-optical crystal or magneto-optical glass in the visible light and infrared bands, and the reflector 9 is arranged at intervals at the light output end of the collimating lens 5, and the distance between the light output surface of the collimating lens 5 and the intersection and overlap area of ​​the three-fiber collimated light is equal to the length of the sum of the optical paths of the collimating lens 5 and the reflector 9; a total reflector is arranged on the end face of the other end of the second connecting tube 6, and the total reflector is used to reflect the optical signal emitted by the collimating lens 5.

[0016] Furthermore, the collimating lens 5 is made of TGG crystal.

[0017] Specifically, TGG crystal, also known as terbium gallium garnet crystal, has the chemical formula Tb3Ga5O12 and is a high-performance magneto-optical crystal in the visible and infrared bands. TGG crystal has high magneto-optical constant, low optical loss, high thermal conductivity and high laser damage threshold. TGG single crystal is the best magneto-optical material for making Faraday polarizers and isolators, with an applicable wavelength of 400~1100nm.

[0018] Further, the three cores of the three-fiber collimating optical fiber 1 are arranged side by side; the walk-off chip 3 (work-off crystal slice) and the 1 / 2 wave plate 4 are sequentially bonded and arranged on the end of the three-fiber collimating optical fiber 1. Specifically, the walk-off chip 3 (work-off crystal slice) and the 1 / 2 wave plate 4 form a combined block of the walk-off chip 3 (work-off crystal slice) and the 1 / 2 wave plate 4 and are then arranged on the end of the three-fiber collimating optical fiber 1.

[0019] Furthermore, the reflector 9 is a Wollaston prism or a birefringent crystal wedge.

[0020] Furthermore, it also includes a magnetic ring 8 , which is sleeved on the outer circumference of the first connecting tube 2 and the second connecting tube 6 . The magnetic ring 8 is located on the circumference of the collimating lens 5 and provides magnetism to the collimating lens 5 .

[0021] Furthermore, the 1 / 2 wave plate 4 is a three-piece structure, which can be a plurality of optical sheets that are optically bonded, deepened optically bonded, or glued with a corresponding light conductivity to a corresponding thickness, and then cut by a slicer according to preset specifications, that is, a one-time preparation is completed without the need to set the patches on the walk-off crystal separately. After cutting, the smaller parts can be glued together by arranging their sides side by side. The processing cost of this method is extremely low, and it greatly facilitates the assembly and processing of the circulator.

[0022] Furthermore, the fiber end face of the middle fiber of the three-fiber collimating fiber 1 is plated with a high-reflection film or engraved with a reflection grating to form a high-isolation double-stage isolator.

[0023] The utility model adopts the above technical solution, the collimating lens 5 is formed by magneto-optical crystal and magneto-optical glass, and the length of the micro lens is equal to the required length of the magneto-optical crystal. In this way, the production cost is low and the structure is also very simple and crude.

[0024] The distance between the light-emitting surface of the collimating lens 5 of the utility model and the intersection and overlap area of ​​the three-fiber collimated light is equivalent to the total path length of the TGG crystal and the crystal wedge angle, and the reflective micro-chip is at the light-emitting end of the crystal wedge angle. The micro-lens of the patent can be directly made of magneto-optical crystal and magneto-optical glass, and the length of the micro-lens is the length of the required magneto-optical crystal. The magnetic ring 8 is directly sleeved on the glass tube sleeve of the collimator. The patent reflects the intermediate optical fiber light back, and then a double-stage isolator is made.

[0025] The utility model adopts the above technical solution, using TEC optical fiber or three-fiber head with large mode field diameter, walk-off wafer 3 (work-off crystal slice) and 1 / 2 wave plate 4 combination block, TGG crystal or magneto-optical glass collimating lens 5, birefringent crystal wedge angle or wedge angle pair, reflector, strong magnetic field magnetic ring 8. The utility model adopts the above technical solution, the distance between the light-emitting surface of the collimating lens 5 and the intersection and overlap area of ​​the three-fiber collimated light is equivalent to the total path length of the TGG crystal and the crystal wedge angle, and the reflective micro-chip is at the light-emitting end of the crystal wedge angle. The microlens of this patent can be directly made of magneto-optical crystal and magneto-optical glass, and the length of the microlens is the length of the required magneto-optical crystal. The magnetic ring 8 is directly sleeved on the glass tube sleeve of the collimator. The utility model adopts the above technical solution to reflect the intermediate optical fiber light back, so as to make a double-stage isolator.

[0026] Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians of the art without making creative work are within the scope of protection of the present application.

Claims

1. A single-ended visible light and near-infrared optical fiber circulator, characterized in that: It includes a first connecting tube, a second connecting tube, and a three-fiber collimating optical fiber, a walk-off chip, a 1 / 2 wave plate, a collimating lens, an optical lens and a reflector arranged in sequence; the three-fiber collimating optical fiber has three fiber cores for transmitting optical signals, and one end of the three-fiber collimating optical fiber is inserted into one end of the first connecting tube. The walk-off chip is arranged at one end of the three-fiber collimating fiber; the 1 / 2 wave plate is arranged at the end of the walk-off chip away from the three-fiber collimating fiber, and corresponds to the three fiber cores of the three-fiber collimating fiber one by one; one end of the collimating lens is sleeved in the other end of the first connecting tube, and the other end of the collimating lens extends into one end of the second connecting tube; the other end of the first connecting tube is spherically matched with one end of the second connecting tube; the collimating lens is made of magneto-optical crystal or magneto-optical glass in the visible light and infrared bands, the optical lenses are arranged at intervals at the light-emitting end of the collimating lens, and the distance between the light-emitting surface of the collimating lens and the intersection and overlap area of ​​the three-fiber collimating light is equal to the length of the sum of the optical paths of the collimating lens and the optical lens; a total reflection mirror is arranged on the end face of the other end of the second connecting tube, and the total reflection mirror is used to reflect the light signal emitted by the collimating lens.

2. A single-ended visible light and near-infrared optical fiber circulator according to claim 1, characterized in that: The three fiber cores of the three-fiber collimator are arranged side by side; the walk-off chip and the 1 / 2 wave plate are sequentially attached to the ends of the three-fiber collimator.

3. A single-ended visible light and near-infrared optical fiber circulator according to claim 1, characterized in that: The 1 / 2 wave plate is a three-piece structure that is cut and formed sequentially.

4. A single-ended visible light and near-infrared optical fiber circulator according to claim 1, characterized in that: The optical lenses are Wollaston prisms or birefringent crystal wedges.

5. A single-ended visible light and near-infrared optical fiber circulator according to claim 1, characterized in that: The fiber end face of the middle fiber of the three-fiber collimation fiber is coated with a high-reflection film or engraved with a reflection grating to form a high-isolation double-stage isolator.

6. A single-ended visible light and near-infrared optical fiber circulator according to claim 1, characterized in that: It also includes a magnetic ring, which is sleeved on the outer circumference of the first connecting tube and the second connecting tube. The magnetic ring is located on the circumference of the collimating lens and provides magnetism to the collimating lens.

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