Microminiature optical isolation device based on optical fiber lens

Abstract

The utility model provides a subminiature optical isolation device based on an optical fiber lens. The subminiature optical isolation device comprises a first optical fiber lens assembly, an isolation assembly and a second optical fiber lens assembly which are arranged in sequence. Wherein the first optical fiber lens assembly is provided with a first optical fiber lens and a first supporting piece, the second optical fiber lens assembly is provided with a second optical fiber lens and a second supporting piece, the first optical fiber lens is directly processed at the tail end of a first optical fiber, the first supporting piece is sleeved outside the first optical fiber lens, and the second optical fiber lens is directly processed at the tail end of a second optical fiber. The second supporting piece is sleeved outside the second optical fiber lens; the isolation assembly is located between the first optical fiber lens assembly and the second optical fiber lens assembly and comprises a first light splitting crystal, an optical rotation crystal and a second light splitting crystal, and the optical rotation crystal is located between the first light splitting crystal and the second light splitting crystal. According to the utility model, miniaturization of the optical isolation device can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication devices, and specifically, to a super-small optical isolation device based on an optical fiber lens. Background Art

[0002] With the development of optical communication technology, optical devices are widely used in optical fiber communication systems. Among them, an optical isolation device is a common optical device. The optical isolation device only allows unidirectional transmission of optical signals, that is, the optical signal can only enter from the first end of the optical isolation device and exit from the second end, and the optical signal incident from the second end cannot exit from the first end.

[0003] With the continuous improvement of the requirements for data transmission speed in modern communication technology, the performance of optical devices has also been continuously improved. To improve the data transmission speed, usually two ways are adopted. The first is to improve the data transmission rate of a single link, and the second is to increase the number of links. However, it is relatively difficult to improve the transmission rate of a single link, and the number of links can relatively easily increase the amount of transmitted data, but it will also increase the floor area of the device and increase the cost. Therefore, usually, it is considered to reduce the volume of the link device to achieve the purpose of reducing the space required for the site.

[0004] Increasing the number of links in an optical fiber communication system will lead to an increase in the volume of the optical fiber communication system. Since the installation space of the optical fiber communication system is often limited, increasing the number of links means that it is necessary to reduce the volume of the optical devices therein and achieve miniaturization of the optical devices. Traditional optical isolation devices are usually large in volume. Usually, a separate lens is required to collimate and focus the divergent light emitted from the optical fiber. Due to the limitations of the lens processing technology, it is impossible to process a lens with a smaller size, resulting in the inability to further compress the size of traditional devices.

[0005] In addition, the collimating lens in traditional devices itself will increase the material cost, and the lens also needs to be adjusted and coordinated with the optical fiber, further increasing the labor cost, resulting in a relatively high production cost of the optical isolation device. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a super-small optical isolation device based on an optical fiber lens that realizes miniaturization of volume.

[0007] To achieve the above object, the ultra-small optical isolation device based on an optical fiber lens provided by the present utility model includes a first optical fiber lens assembly, an isolation assembly, and a second optical fiber lens assembly arranged in sequence; wherein, the first optical fiber lens assembly is provided with a first optical fiber lens, the first optical fiber lens is sheathed with a first support member, the second optical fiber lens assembly is provided with a second optical fiber lens, and the second optical fiber lens is sheathed with a second support member; the first optical fiber lens is directly processed at the end of the first optical fiber, and the second optical fiber lens is directly processed at the end of the second optical fiber; the isolation assembly is located between the first optical fiber lens assembly and the second optical fiber lens assembly, and the isolation assembly includes a first beam splitting crystal, a Faraday rotator crystal, and a second beam splitting crystal, and the Faraday rotator crystal is located between the first beam splitting crystal and the second beam splitting crystal.

[0008] As can be seen from the above solution, a first optical fiber lens and a second optical fiber lens are provided in the optical isolation device, and moreover, both the first optical fiber lens and the second optical fiber lens are directly processed at the ends of the optical fibers. In this way, the lens size is greatly reduced, and there is no need to adjust and cooperate the optical fibers and the lenses. While reducing the size and components, it can also reduce the labor cost, which not only meets the requirements of miniaturization of optical devices but also reduces the manufacturing cost of the devices.

[0009] A preferred solution is that the first optical fiber lens assembly is bonded to the first side of the isolation assembly by an adhesive. Further, the second optical fiber lens assembly is on the second side of the isolation assembly by an adhesive; the first side and the second side are opposite to each other.

[0010] Thus, by using the adhesive to fix the first optical fiber lens assembly, the second optical fiber lens assembly, and the isolation assembly, the connection of the first optical fiber lens assembly, the second optical fiber lens assembly, and the isolation assembly is very reliable, and there is no need to use additional connecting devices, which is beneficial to reducing the volume of the optical isolation device.

[0011] A further solution is that the Faraday rotator assembly includes a Faraday rotator crystal clamped between the first beam splitting crystal and the second beam splitting crystal, and a magnetic ring is arranged outside the Faraday rotator crystal.

[0012] An alternative solution is that the Faraday rotator crystal is doped with magnetic particles and no magnetic ring is provided.

[0013] Due to the non-reciprocity of the Faraday rotator crystal, after the optical signal passes through the Faraday rotator crystal from the first direction, the reflected optical signal cannot enter the first optical fiber, thereby realizing the isolation of the optical signal.

[0014] A further solution is that the first optical fiber lens assembly further includes a first support member sleeved outside the first optical fiber lens. In addition, the second optical fiber lens assembly further includes a second support member sleeved outside the second optical fiber lens. The provision of the support member can help enhance the strength of the optical isolation device, and at the same time, facilitate the production and use of the device.

[0015] In a further solution, the first fiber optic lens is disposed opposite to the first beam splitting crystal. Further, the second fiber optic lens is disposed opposite to the second beam splitting crystal. Description of the Drawings

[0016] Figure 1 FIG. is a schematic structural view of an embodiment of the ultra-small optical isolation device based on a fiber optic lens of the present utility model.

[0017] Figure 2 FIG. is a cross-sectional view of an embodiment of the ultra-small optical isolation device based on a fiber optic lens of the present utility model.

[0018] The present utility model will be further described below in conjunction with the drawings and embodiments. Detailed Embodiment

[0019] The ultra-small optical isolation device based on a fiber optic lens of the present utility model is an optical isolation device provided with an optical isolation component therein. The optical isolation component is used to isolate an optical signal, so that the optical signal can only be transmitted in one direction, and the reflected optical signal cannot enter the incident end again.

[0020] See Figure 1 And Figure 2 , the ultra-small optical isolation device of the present utility model is provided with an optical isolation component having a first fiber optic lens assembly 10 and a second fiber optic lens assembly 15. Among them, the first fiber optic lens assembly 10 has a first fiber optic lens 11, and a first support member 12 is sleeved outside the first fiber optic lens 11. The first support member 12 can be glass or the like. The first fiber optic lens 11 is directly processed at the end of the first optical fiber, for example, made by methods such as discharging and forming a ball, laser processing or grinding. In addition, the first fiber optic lens 11 can also be made by other known processing techniques, for example, the method of making a fiber optic lens disclosed in the Chinese patent application with the publication number CN1910485A.

[0021] Similar to the first fiber optic lens assembly 10, the second fiber optic lens assembly 15 has a second fiber optic lens 16, and a second support member 17 is sleeved outside the second fiber optic lens 16. The second fiber optic lens 16 is also directly processed at the end of the second optical fiber, so that the size of the second fiber optic lens 16 is very small.

[0022] The ultra-small optical isolation device is further provided with an isolation component 20. In this embodiment, the isolation component 20 has a first beam splitting crystal 21, a second beam splitting crystal 22 and a polarization rotation component. Among them, the polarization rotation component includes a polarization rotation crystal 23, and a magnet 24 is disposed outside the polarization rotation crystal 23.

[0023] From Figure 1 It can be seen that the first fiber optic lens assembly 10 is disposed on the first side of the isolation component 20, that is Figure 2on the left side of [], and the second fiber optic lens assembly 15 is arranged on the second side of the isolation assembly 20, that is Figure 2 on the right side of []. Therefore, the first side and the second side of the isolation assembly 20 are opposite sides. Preferably, the first fiber optic lens assembly 10 is bonded to the first side of the isolation assembly 20 by an adhesive, and the second fiber optic lens assembly 15 is bonded to the second side of the isolation assembly 20 by an adhesive.

[0024] Since the first support 12 is located on the outermost layer of the first fiber optic lens assembly 10, the outer diameter of the first fiber optic lens assembly 10 is actually the outer diameter of the first support 12. Similarly, the outer diameter of the second fiber optic lens assembly 15 is actually the outer diameter of the second support 17. In this embodiment.

[0025] Inside the isolation assembly 20, the first beam splitting crystal 21 is close to the first fiber optic lens assembly 10, the second beam splitting crystal 22 is close to the second fiber optic lens assembly 15, and the optical rotation crystal 23 is clamped between the first beam splitting crystal 21 and the second beam splitting crystal 22. The magnetic ring 24 is sleeved outside the first beam splitting crystal 21, the optical rotation crystal 23 and the second beam splitting crystal 22. Of course, the magnetic ring 24 can also be only sleeved outside the optical rotation crystal 23.

[0026] The optical signal emitted from the first fiber optic lens 11 is incident on the first beam splitting crystal 21. After passing through the first beam splitting crystal 21, the optical signal is incident on the optical rotation crystal 23, passes through the optical rotation crystal 23 and then is incident on the second beam splitting crystal 22, and finally exits from the second beam splitting crystal 22 to the second fiber optic lens 16. Since the optical rotation crystal 23 has non-reciprocity for the optical signal, the optical signal emitted from the first fiber optic lens 11 can pass through the optical rotation crystal 23 and be incident on the second fiber optic lens 16, but the optical signal reflected back from the second fiber optic lens 16 cannot enter the first fiber, thus realizing the isolation of the optical signal and avoiding the interference of the reflected optical signal on the incident optical signal.

[0027] In other embodiments, magnetic particles are doped in the optical rotation crystal, so that there is no need to arrange a magnetic ring outside the optical rotation crystal.

[0028] Preferably, the first fiber optic lens 11 is arranged opposite to the first beam splitting crystal 21, and the second fiber optic lens 16 is arranged opposite to the second beam splitting crystal 22.

[0029] Since the ultra-small optical isolation device of the present invention does not provide a separate collimating lens, but directly forms two fiber optic lenses at the ends of the optical fibers, the volume of the optical isolation device is greatly reduced, and without the need to provide a collimating lens, the number of devices used in the optical isolation device can also be reduced, the production cost can be reduced, and it also has the advantage of being easy to integrate.

[0030] First, by directly processing the fiber lens at the end of the optical fiber, the size of the collimator is effectively reduced. Correspondingly, the size of the isolation component can also be reduced, greatly compressing the size of the optical isolation device and achieving miniaturization of the optical isolation device. Secondly, the present utility model uses a fiber lens to manufacture an optical isolation device, which can simplify the structure of the optical isolation device, simplify the production steps, and can reduce the size of high-value components. For example, reducing the size of the beam-splitting crystal and the optical rotation crystal can reduce the production cost. Finally, due to the small size and simple structure of the optical isolation device, it is easy to integrate with other optoelectronic devices.

[0031] Finally, it should be emphasized that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. The ultra-small optical isolation device based on an optical fiber lens, comprising: A first optical fiber lens assembly, an isolation assembly, and a second optical fiber lens assembly arranged in sequence; It is characterized in that: The first optical fiber lens assembly is provided with a first optical fiber lens and a first support member. The second optical fiber lens assembly is provided with a second optical fiber lens and a second support member. The first optical fiber lens is directly processed at the end of the first optical fiber. The second optical fiber lens is directly processed at the end of the second optical fiber. The first support member is sleeved outside the first optical fiber lens. The second support member is sleeved outside the second optical fiber lens; The isolation assembly is located between the first optical fiber lens assembly and the second optical fiber lens assembly. The isolation assembly includes a first beam splitting crystal, a polarization rotation crystal, and a second beam splitting crystal. The polarization rotation crystal is located between the first beam splitting crystal and the second beam splitting crystal.

2. The ultra-small optical isolation device based on an optical fiber lens according to claim 1, wherein: The first optical fiber lens assembly is on the first side of the isolation assembly through an adhesive.

3. The ultra-small optical isolation device based on an optical fiber lens according to claim 2, wherein: The second optical fiber lens assembly is on the second side of the isolation assembly through an adhesive; The first side is opposite to the second side.

4. The ultra-small optical isolation device based on an optical fiber lens according to any one of claims 1 to 3, wherein: A magnetic ring is arranged outside the polarization rotation crystal.

5. The ultra-small optical isolation device based on an optical fiber lens according to any one of claims 1 to 3, wherein: The first optical fiber lens is arranged opposite to the first beam splitting crystal.

6. The ultra-small optical isolation device based on an optical fiber lens according to any one of claims 1 to 3, wherein: The second optical fiber lens is arranged opposite to the second beam splitting crystal.

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