Reflection type two-stage isolator and communication module

Abstract

The utility model relates to the technical field of optical elements, in particular to a reflective two-stage isolator and a communication module. The reflective two-stage isolator comprises a first crystal, a second crystal, a half-wave plate, an optical rotation plate and a reflective element which are sequentially arranged along an optical path, wherein the dislocation directions of the first crystal and the second crystal are perpendicular to each other; in the X direction, the height of the half-wave plate is smaller than that of the optical rotation sheet, incident light enters the first crystal, sequentially passes through the second crystal, the half-wave plate and the optical rotation sheet and then is reflected by the reflection element, and reflected light sequentially passes through the optical rotation sheet, the second crystal and the first crystal and then is emitted; in the Y direction, the height of the half-wave plate is the same as that of the optical rotation plate, incident light enters the first crystal, sequentially passes through the second crystal, the half-wave plate and the optical rotation plate and then is reflected by the reflection element, and reflected light sequentially passes through the optical rotation plate, the half-wave plate, the second crystal and the first crystal and then is emitted. The above structure can be emitted from the same side of the first crystal along a light path so as to adapt to a special application environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical element technical field, especially a reflection type two-stage isolator and communication module. BACKGROUND

[0002] In the conventional two-stage isolator, there are two single-stage isolator cores, and the isolation degree is controlled by the relative angle of the two single-stage isolator cores.

[0003] In some special application environments, the signal light needs to enter and exit along the same side, and the application of the conventional isolator is limited, which is not conducive to the use and promotion of the isolator. SUMMARY

[0004] The technical problem to be solved by the embodiments of the utility model lies in providing a reflection type two-stage isolator and communication module to solve the problem that in some special application environments, the signal light needs to enter and exit along the same side, and the application of the conventional isolator is limited, which is not conducive to the use and promotion of the isolator.

[0005] The utility model discloses a reflection type two-stage isolator, include: first crystal, second crystal, half wave sheet, rotatory polarization piece and reflection element that set gradually along the light path, wherein, the misplacement direction of first crystal and second crystal is perpendicular to each other, in X direction, the height of half wave sheet is less than the height of rotatory polarization piece, incident light is incident to first crystal, and is passed through second crystal, half wave sheet, rotatory polarization piece in proper order after, be reflected by reflection element, and the reflected light is passed through rotatory polarization piece, second crystal and first crystal in proper order after emission, in Y direction, the height of half wave sheet is same with the height of rotatory polarization piece, incident light is incident to first crystal, and is passed through second crystal, half wave sheet, rotatory polarization piece in proper order after, be reflected by reflection element, and the reflected light is passed through rotatory polarization piece, half wave sheet, second crystal and first crystal in proper order after emission.

[0006] Optionally, the side, away from the second crystal, of the first crystal is provided with incident optical fibers and emission optical fibers arranged in parallel to each other, the incident light enters the first crystal through the incident optical fibers, and the reflected light is emitted through the emission optical fibers.

[0007] Optionally, a lens is further arranged between the rotatory polarization piece and the reflection element.

[0008] Optionally, the first crystal and the second crystal are both birefringent crystals.

[0009] Optionally, the first crystal and the second crystal are both yttrium vanadate crystals.

[0010] Optionally, the lens is a collimating lens.

[0011] Optionally, the reflecting element is a mirror.

[0012] The utility model discloses still a kind of communication module, including the reflection type two-stage isolator described above, including first crystal, second crystal, half-wave plate, optical rotatory plate and reflecting element are sequentially arranged along optical path, in application process, in X direction, the height of half-wave plate is less than the height of optical rotatory plate, incident light is incident to first crystal, and sequentially after passing second crystal, half-wave plate, optical rotatory plate, it is reflected by reflecting element, reflected light is sequentially after passing optical rotatory plate, second crystal and first crystal and is emitted;In Y direction, the height of half-wave plate is same with the height of optical rotatory plate, incident light is incident to first crystal, and sequentially after passing second crystal, half-wave plate, optical rotatory plate, it is reflected by reflecting element, reflected light is sequentially after passing optical rotatory plate, half-wave plate, second crystal and first crystal and is emitted;Therefore, optical signal can be emitted from the same side of first crystal, realize signal light and enter along the same side of first crystal, to adapt to special application environment, facilitate the use and popularization of isolator;Wherein, the misplacement direction of first crystal and first crystal is perpendicular, can be realized by adjusting the crystal axis direction of two materials, by the misplacement of two perpendicular directions, can increase the distance difference of reverse isolation, to improve isolation effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] The technical scheme of the utility model will be described further in detail below in combination with drawings and examples, and in the drawings:

[0014] Figure 1 It is the three-dimensional schematic view of reflection type two-stage isolator provided by the utility model embodiment;

[0015] Figure 2 It is the forward light transmission principle view of reflection type two-stage isolator sub in XZ direction provided by the utility model embodiment;

[0016] Figure 3 It is the forward light transmission principle view of reflection type two-stage isolator sub in YZ direction provided by the utility model embodiment;

[0017] Figure 4 It is the reverse light entry schematic view of reflection type two-stage isolator sub in XZ direction provided by the utility model embodiment;

[0018] Figure 5 It is the reverse light entry schematic view of reflection type two-stage isolator sub in YZ direction provided by the utility model embodiment.

[0019] Marked in the drawing is: 10, first crystal;20, second crystal;30, half-wave plate;40, optical rotatory plate;50, lens;60, reflecting element;70, incident optical fiber;80, emitted optical fiber. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] This utility model embodiment provides a reflective two-stage isolator, such as Figures 1 to 5 As shown, the optical path includes a first crystal 10, a second crystal 20, a half-wave plate 30, a rotator plate 40, and a reflecting element 60 arranged sequentially along the optical path. The misalignment directions of the first crystal 10 and the second crystal 20 are perpendicular to each other. In the X direction, the height of the half-wave plate 30 is less than the height of the rotator plate 40. The incident light is incident on the first crystal 10 and passes through the second crystal 20, the half-wave plate 30, and the rotator plate 40 in sequence before being reflected by the reflecting element 60. The reflected light passes through the rotator plate 40, the second crystal 20, and the first crystal 10 in sequence before exiting. In the Y direction, the height of the half-wave plate 30 is the same as the height of the rotator plate 40. The incident light is incident on the first crystal 10 and passes through the second crystal 20, the half-wave plate 30, and the rotator plate 40 in sequence before being reflected by the reflecting element 60. The reflected light passes through the rotator plate 40, the half-wave plate 30, the second crystal 20, and the first crystal 10 in sequence before exiting.

[0022] The reflective two-stage isolator of this embodiment includes a first crystal 10, a second crystal 20, a half-wave plate 30, a rotator 40, and a reflective element 60 arranged sequentially along the optical path. In application, in the X direction, the height of the half-wave plate 30 is less than the height of the rotator 40. Incident light enters the first crystal 10 and passes sequentially through the second crystal 20, the half-wave plate 30, and the rotator 40 before being reflected by the reflective element 60. The reflected light then passes sequentially through the rotator 40, the second crystal 20, and the first crystal 10 before exiting. In the Y direction, the height of the half-wave plate 30 is the same as the height of the rotator 40. Incident light enters the first crystal 10 and passes sequentially through the second crystal 20, the half-wave plate 30, and the rotator 40 before being reflected by the reflective element 60. The reflected light then exits after passing sequentially through the rotator 40, the second crystal 20, and the first crystal 10. After passing through the second crystal 20, half-wave plate 30, and optical rotator 40, the light is reflected by the reflective element 60. The reflected light then passes through the optical rotator 40, half-wave plate 30, second crystal 20, and first crystal 10 in sequence before exiting. Therefore, the optical signal can exit from the same side of the first crystal 10, realizing that the signal light enters and exits along the same side of the first crystal 10, which can adapt to special application environments and facilitate the use and promotion of isolators. The misalignment direction of the two first crystals 10 is perpendicular, which can be achieved by adjusting the crystal axis direction of the two materials. By misaligning the two perpendicular directions, the distance difference of reverse isolation can be increased to improve the isolation effect.

[0023] In this embodiment, the first crystal 10 is provided with an incident optical fiber 70 and an outgoing optical fiber 80 arranged in parallel on the side opposite to the second crystal 20. The incident light enters the first crystal 10 through the incident optical fiber 70, and the reflected light exits through the outgoing optical fiber 80.

[0024] In this embodiment, the arrangement of the incident fiber 70 and the outgoing fiber 80 makes the access and output of optical signals more convenient and efficient. The parallel arrangement of the incident fiber 70 and the outgoing fiber 80 facilitates connection with other optical communication devices in practical applications, reduces the complex wiring in the connection process of the incident fiber 70 and the outgoing fiber 80, and improves the convenience of system integration.

[0025] In this embodiment, refer to Figures 1 to 5 A lens 50 is also provided between the optical rotator 40 and the reflective element 60.

[0026] A lens 50 is positioned between the optical rotator 40 and the reflecting element 60. The lens 50 can focus or collimate the light. In this reflective two-stage isolator, the lens 50 optimizes the propagation characteristics of light in this part of the optical path, improving the transmission efficiency of the optical signal. For example, the lens 50 can collimate the diverging light passing through the optical rotator 40 into parallel light, making it more effectively reflected by the reflecting element 60, reducing energy loss during propagation, and improving the overall optical signal transmission quality of the isolator.

[0027] The following describes the forward optical path transmission process in this embodiment, with reference to... Figures 2 to 3 :

[0028] After the incident light from the incident fiber 70 passes through the first crystal 10, it is split into o-light and e-light, and the e-light is misaligned in the x-direction.

[0029] Then, after passing through the second crystal 20, the directions of the o-ray and e-ray remain unchanged, while the e-ray is misaligned in the y-direction.

[0030] Then, after passing through a half-wave plate at 30° (-22.5°), rotate 45° clockwise.

[0031] Then, after passing through the optical rotation plate 40, it rotates 22.5 degrees clockwise, for a total rotation of 45 degrees + 22.5 degrees = 66.5 degrees;

[0032] Then, the light is collimated by lens 50, reflected by reflector 60, and then converted into converging light by lens 50 again.

[0033] Then, after passing through the optical rotation plate, it rotates 40 degrees clockwise and then 22.5 degrees, for a total rotation of 45 degrees + 22.5 degrees + 22.5 degrees = 90 degrees, which is exactly converted into e-light and o-light;

[0034] The converted e light and o light pass through the second crystal 20, the e light is deflected back in the y direction, and the o light remains unchanged;

[0035] After passing through the first crystal 10, the e light is deflected back in the x direction, and the o light remains unchanged;

[0036] The o light and e light just combine to become circularly polarized light, and are incident on the exit fiber 80;

[0037] The following gives the light path transmission process of the reverse passing of the embodiment, referring to Figure 4 and Figure 5 :

[0038] The incident light of the exit fiber 80 passes through the first crystal 10 and is divided into o light and e light, and the e light has a misalignment in the x direction;

[0039] Then, after passing through the second crystal 20, the o light and e light remain unchanged in direction, and the e light has a misalignment in the y direction;

[0040] Then, after passing through the half-wave plate 30, it is rotated by 22.5 degrees clockwise;

[0041] Then, after passing through the lens 50, it is converted into collimated light, reflected after passing through the mirror, and then converted into convergent light again after passing through the lens 50;

[0042] Then, after passing through the rotatory plate 40, it is rotated by 22.5 degrees clockwise again, and the total rotation is 22.5 degrees+22.5 degrees=45 degrees;

[0043] Then, after passing through the half-wave plate 30 (-22.5 degrees) in reverse, it is rotated by -45 degrees clockwise, and the total rotation is 22.5 degrees+22.5 degrees-45 degrees=0 degrees, keeping the original o light and e light;

[0044] The unconverted o light and e light pass through the second crystal 20, the e light continues to misalign in the y direction, and the o light remains unchanged;

[0045] After passing through the second crystal 20, the e light continues to misalign in the x direction, and the o light remains unchanged;

[0046] The o light and e light keep a considerable distance and cannot combine and be incident on the exit fiber 80.

[0047] As a preferred scheme of the embodiment, the first crystal 10 and the second crystal 20 are both birefringent crystals.

[0048] As a preferred scheme of the embodiment, the first crystal 10 and the second crystal 20 both use yttrium vanadate crystals.

[0049] The yttrium vanadate crystal has good optical uniformity, high damage threshold, and stable physical and chemical properties. The optical uniformity ensures that the generation and propagation characteristics of o light and e light are stable when the light propagates in the crystal, and the distortion or loss of the optical signal is not caused by the non-uniformity inside the crystal. The high damage threshold enables the crystal to withstand a higher power optical signal, and in the optical communication system, it can work stably and is not easy to be damaged when facing different intensity of optical signal input. The stable physical and chemical properties ensure that the crystal can maintain its optical performance stability under different environmental conditions (such as temperature and humidity changes), thereby ensuring the long-term stable operation of the entire reflective double-stage isolator.

[0050] As a preferred scheme of the embodiment, the lens 50 is a collimating lens.

[0051] The collimating lens can convert the divergent light beam into a parallel light beam, ensuring that the optical signal can be uniformly reflected at the reflecting element 60, avoiding the non-uniformity of the reflected light caused by the divergence or convergence of the light, thereby improving the quality and stability of the reflected light. This is of great significance to improve the isolation performance of the isolator and ensure the accurate transmission of the optical signal in the entire optical path, especially in the optical communication application scenarios with high requirements for the quality of the optical signal, the role of the collimating lens is more critical.

[0052] As a preferred scheme of the embodiment, the reflecting element 60 is a mirror.

[0053] The mirror has high reflectivity and can efficiently reflect the optical signal collimated by the lens 50, ensuring that the optical signal propagates along the designed path in the optical path of the reflective double-stage isolator. The high reflectivity reduces the energy loss of the optical signal in the reflection process, improves the utilization rate of the optical signal, and helps to improve the performance of the entire isolator. At the same time, the structure of the mirror is relatively simple, easy to install and adjust, and reduces the manufacturing cost and maintenance difficulty of the isolator under the premise of ensuring the optical performance.

[0054] The application also discloses a communication module comprising the reflective double-stage isolator in the foregoing embodiment. The communication module comprises the same structure and advantages as the reflective double-stage isolator in the foregoing embodiment. The structure and advantages of the reflective double-stage isolator have been described in detail in the foregoing embodiment, and will not be repeated here.

[0055] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, but not limit them, and for those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced equivalently; all these modifications and replacements should belong to the protection scope of the claims of the present application.

Claims

1. A reflective two-stage isolator, characterized in that, include: A first crystal, a second crystal, a half-wave plate, a rotator, and a reflective element are arranged sequentially along the optical path, wherein the misalignment directions of the first crystal and the second crystal are perpendicular to each other; In the X direction, the height of the half-wave plate is less than the height of the optical rotator. The incident light is incident on the first crystal and passes through the second crystal, the half-wave plate, and the optical rotator in sequence before being reflected by the reflective element. The reflected light passes through the optical rotator, the second crystal, and the first crystal in sequence before exiting. In the Y direction, the height of the half-wave plate is the same as the height of the optical rotator. The incident light is incident on the first crystal and passes through the second crystal, the half-wave plate, and the optical rotator in sequence before being reflected by the reflective element. The reflected light passes through the optical rotator, the half-wave plate, the second crystal, and the first crystal in sequence before exiting.

2. The reflective two-stage isolator according to claim 1, characterized in that, The first crystal has an incident optical fiber and an outgoing optical fiber arranged parallel to each other on the side opposite to the second crystal. The incident light enters the first crystal through the incident optical fiber, and the reflected light exits through the outgoing optical fiber.

3. The reflective two-stage isolator according to claim 2, characterized in that, A lens is also provided between the optical rotator and the reflective element.

4. The reflective two-stage isolator according to claim 1, characterized in that, Both the first crystal and the second crystal are birefringent crystals.

5. The reflective two-stage isolator according to claim 4, characterized in that, Both the first crystal and the second crystal are made of yttrium vanadate crystals.

6. The reflective two-stage isolator according to claim 3, characterized in that, The lens is a collimating lens.

7. The reflective two-stage isolator according to claim 1, characterized in that, The reflective element is a reflector.

8. A communication module, characterized in that, Includes the reflective two-stage isolator as described in any one of claims 1 to 7.

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