Four-channel integrated optical fiber isolator
By designing a four-channel integrated fiber optic isolator, the problems of increased space occupation and high cost caused by the increased number of fiber optic isolators in fiber optic communication are solved, achieving the effects of space saving and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-03-24
AI Technical Summary
In existing fiber optic communication, as the optical module rate increases, the number of fiber optic isolators per channel increases, resulting in problems such as large space occupation and high cost.
Design a four-channel integrated fiber optic isolator that integrates four isolators within the form factor of a conventional isolator. Employ one isolator core and two four-core collimators to achieve unidirectional transmission and reverse isolation of optical signals.
This significantly reduces the space required for fiber optic isolators, saving costs while maintaining the stability and lifespan of optical signals.
Smart Images
Figure CN224035664U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical fiber communication field especially four channel integrated optical fiber isolator. BACKGROUND
[0002] Wavelength division multiplexing (WDM) is the main means of increasing capacity of current optical fiber communication, and with the development of optical fiber communication technology, more and more rapid and higher integrated optical systems are becoming more and more important.
[0003] Optical fiber isolator is a kind of passive optical device that allows optical signal to pass in one direction, and the working principle of one kind of optical fiber isolator is based on the nonreciprocity of Faraday rotation of magneto-optical crystal, which limits the direction of light to make the light transmit in single direction, and the light reflected by optical fiber echo can be well isolated by optical isolator to prevent reflected light from interfering light source.
[0004] Current optical module rate is higher and higher, and array light multiplexing is needed, so the requirement for array laser is higher and higher, a considerable number of isolators are configured to isolate reverse light for protecting the stability and service life of laser, so a large number of optical fiber isolators and light sources are needed for corresponding use, and the current conventional optical fiber isolator is single channel, and with the sharp increase of the number of laser, the number of optical fiber isolators also sharply increases and occupies more and more space. UTILITY MODEL CONTENT
[0005] In view of the above problems, the utility model provides a four channel integrated optical fiber isolator, which realizes the function of four isolators with the outer dimension of one conventional isolator, greatly reduces the use space and saves cost.
[0006] The utility model adopts the technical scheme that:
[0007] A four channel integrated optical fiber isolator, comprising a tube shell, the two ends of the tube shell are respectively provided with a first optical fiber collimator and a second optical fiber device, the first optical fiber collimator and the second optical fiber collimator both have 4-core optical fibers, the 4-core optical fiber in the first optical fiber collimator corresponds to the 4-core optical fiber in the second optical fiber collimator one by one, an isolator core is arranged between the first optical fiber collimator and the second optical fiber collimator, the isolator core comprises an outer tube, the outer tube is provided with a first birefringent crystal corresponding to the first optical fiber collimator and a second birefringent crystal corresponding to the second optical fiber collimator, and an optical rotator is arranged between the first birefringent crystal and the second birefringent crystal.
[0008] Preferably, the first fiber collimator includes a first sleeve, in which a first capillary tube and a first collimating lens are inserted, and four optical fibers are inserted in the first capillary tube; the second fiber collimator includes a second sleeve, in which a second capillary tube and a second collimating lens are inserted, and four optical fibers are inserted in the second capillary tube; the first collimating lens and the second collimating lens both extend out of the sleeve and are arranged opposite to each other, and the isolator core is located between the first collimating lens and the second collimating lens.
[0009] More preferably, both the first capillary and the second capillary are provided with slots for accommodating four optical fibers.
[0010] More preferably, the slot is square.
[0011] More preferably, the slot is rectangular.
[0012] More preferably, the diameter of the optical fiber is 0.0625 mm.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a four-channel integrated fiber optic isolator, which achieves the function of four isolators with the size of one conventional isolator, greatly reducing the space required, and only using one isolator core and two four-core collimators, thus saving costs. Attached Figure Description
[0014] Figure 1 A schematic diagram of a four-channel integrated fiber optic isolator provided by this utility model.
[0015] Figure 2 A schematic diagram of the first fiber collimator in a four-channel integrated fiber optic isolator provided by this utility model.
[0016] Figure 3 A schematic diagram of the fiber arrangement and installation in the first fiber collimator of a four-channel integrated fiber optic isolator provided by this utility model. Figure 1 .
[0017] Figure 4 A schematic diagram of the fiber arrangement and installation in the first fiber collimator of a four-channel integrated fiber optic isolator provided by this utility model. Figure 2 .
[0018] Figure 5 This is a schematic diagram of the forward transmission of the isolator core in a four-channel integrated fiber optic isolator provided by this utility model.
[0019] Figure 6 This is a schematic diagram of the reverse transmission of the isolator core in a four-channel integrated fiber optic isolator provided by this utility model. Detailed Implementation
[0020] The preferred embodiments of this utility model will be described in detail with reference to the accompanying drawings.
[0021] Figures 1 to 6 This invention provides a preferred embodiment of a four-channel integrated fiber optic isolator. For example... Figures 1 to 6 As shown, the four-channel integrated fiber optic isolator includes a housing 10, with a first fiber collimator 20 and a second fiber optic device 30 respectively located at both ends of the housing. Each of the first and second fiber collimators 20 contains four optical fibers, with the four optical fibers in the first collimator 20 corresponding one-to-one with those in the second collimator 30. An isolator core 40 is located between the first and second fiber collimators 20 and 30. The isolator core 40 includes an outer tube 41, within which are a first birefringent crystal 41 corresponding to the first fiber collimator and a second birefringent crystal 42 corresponding to the second fiber collimator. A rotator 43 is located between the first and second birefringent crystals 41 and 42. The first and second fiber collimators 20 and 30 are respectively located at the left and right ends of the housing 10.
[0022] The isolator core 40 can be either polarization-independent or polarization-dependent. Let's take the polarization-independent type as an example: during forward transmission, if... Figure 5 As shown, four optical signals are input from the left side of the four-core optical fiber. After being collimated by the first optical fiber collimator 20 on the left, they pass horizontally through the middle isolator core 40, and are refracted by the first birefringent crystal 41, the optical rotator 43, and the second birefringent crystal 42, still outputting horizontally. Finally, they are received by the four optical fibers of the second optical fiber collimator 30 on the right. The optical paths correspond one-to-one within the optical fibers, transmitting independently. However, during reverse transmission, as... Figure 6 As shown, four optical signals are input from the right side of the four-core optical fiber. After being collimated by the second optical fiber collimator 30 on the right side, the signals pass horizontally through the middle isolator core 40, and are refracted by the second birefringent crystal 42, the optical rotator 43, and the first birefringent crystal 41. Due to the influence of magnetism, the optical path eventually undergoes an angular shift, and there is no horizontal output. Therefore, the signals cannot be received by the first optical fiber collimator 20 on the left side. The optical paths are not received one by one in the optical fiber, which is equivalent to the optical signals being isolated.
[0023] like Figure 2As shown, the first fiber collimator 20 and the second fiber collimator 30 have similar structures. The first fiber collimator 20 includes a first sleeve 21, in which a first capillary tube 22 and a first collimating lens 23 are inserted. Four optical fibers are inserted into the first capillary tube 22. The second fiber collimator 30 includes a second sleeve 31, in which a second capillary tube 32 and a second collimating lens 33 are inserted. Four optical fibers are inserted into the second capillary tube 32. The first collimating lens 23 and the second collimating lens 33 both extend out of the sleeve and are arranged opposite to each other. The isolator core 40 is located between the first collimating lens 23 and the second collimating lens 33.
[0024] Both the first capillary tube 22 and the second capillary tube 32 are provided with slots 200 for accommodating four optical fibers, such as... Figure 3 and 4 As shown, the slot can be square or rectangular. Four optical fibers are installed equidistantly into the slot and fixed with glue. The commonly used optical fiber diameter is 0.0625mm (62.5um). Due to the processing technology, the actual diameter may vary.
[0025] The four-channel integrated fiber optic isolator provided by this utility model achieves the functions of four isolators with the size of one conventional isolator, greatly reducing the space required and thus reducing the space occupied by fiber optic isolators in communication equipment; and it only uses one isolator core and two four-core collimators, saving both space and cost.
[0026] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.
Claims
1. A four-channel integrated fiber optic isolator, comprising a housing, characterized in that, The tube shell has a first fiber collimator and a second fiber collimator at its two ends, respectively. Each of the first and second fiber collimators has 4-core optical fibers, and the 4-core optical fibers in the first fiber collimator correspond one-to-one with the 4-core optical fibers in the second fiber collimator. An isolator core is provided between the first and second fiber collimators. The isolator core includes an outer tube, and the outer tube contains a first birefringent crystal corresponding to the first fiber collimator and a second birefringent crystal corresponding to the second fiber collimator. A rotator is provided between the first and second birefringent crystals.
2. The four-channel integrated fiber optic isolator according to claim 1, characterized in that: The first fiber collimator includes a first sleeve, into which a first capillary tube and a first collimating lens are inserted, and four optical fibers are inserted in the first capillary tube; the second fiber collimator includes a second sleeve, into which a second capillary tube and a second collimating lens are inserted, and four optical fibers are inserted in the second capillary tube; both the first and second collimating lenses extend out of the sleeve and are arranged opposite to each other, and the isolator core is located between the first and second collimating lenses.
3. The four-channel integrated fiber optic isolator according to claim 2, characterized in that: Both the first and second capillaries have slots for accommodating four optical fibers.
4. The four-channel integrated fiber optic isolator according to claim 2, characterized in that: The slot is square.
5. The four-channel integrated fiber optic isolator according to claim 2, characterized in that: The slot is rectangular.
6. The four-channel integrated fiber optic isolator according to claim 2, characterized in that: The optical fiber has a diameter of 0.0625 mm.