Single-side fiber outgoing integrated micro-optical device

Abstract

The utility model provides a single-side fiber outgoing integrated micro-optical device, which is characterized in that a first optical fiber and a second optical fiber are arranged on the same side of a polarizing beam splitter, and a lens assembly, a Faraday rotation sheet and a total reflection sheet are sequentially arranged on the other side of the polarizing beam splitter; an optical signal emitted from the first optical fiber sequentially passes through the polarizing beam splitter, the lens assembly, the Faraday rotating piece and the total reflection piece, then is reflected back by the total reflection piece and is received by the second optical fiber, signal light is sent and received under single-side fiber outgoing, the internal layout of the module is more flexible, a half-wave plate is further arranged on an optical path of the first optical fiber, and the optical path of the first optical fiber is more flexible. The isolator is used for isolating optical signals returned from the second optical fiber to the first optical fiber, and the effect of the isolator is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical devices, in particular to a single-side fiber-outlet integrated micro-optical device. Background Art

[0002] With the development of coherent optical modules, silicon photonics solutions have gradually shown an advantageous position in the competition. However, due to the large loss of silicon photonics solutions, in order to ensure the long-distance transmission of the module, it is necessary to integrate optical transceiver integrated devices in the coherent module. The corresponding optical transceiver integrated devices all adopt a double-sided fiber output method, that is, the emitting optical fiber and the receiving optical fiber are located at different two sides. As a result, the optical transceiver integrated devices will occupy more space inside the module, which increases the difficulty of module optical path layout and engineering production.

[0003] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in the field of this technology. Utility Model Content

[0004] The problem to be solved by the utility model is that it is necessary to solve the problem that the optical transceiver integrated device occupies a large space inside the module due to the double-sided fiber output.

[0005] In a first aspect, a single-side fiber-outlet integrated micro-optical device is provided, comprising: a first optical fiber 1, a second optical fiber 2, a polarizing beam splitter 3, a first half-wave plate 4, a lens assembly 5, a Faraday rotator 6 and a total reflection plate 7, wherein:

[0006] The first optical fiber 1 and the second optical fiber 2 are arranged on the same side of the polarizing beam splitter 3, and the first optical fiber 1 and the second optical fiber 2 are parallel; the lens assembly 5, the Faraday rotation plate 6 and the total reflection plate 7 are arranged in sequence on the other side of the polarizing beam splitter 3, and the first half-wave plate 4 is arranged between the polarizing beam splitter 3 and the lens assembly 5, and is located on the optical path of the first optical fiber 1.

[0007] Preferably, when the first optical fiber 1 emits an optical signal, the optical signal is divided into a first o light 11 and a first e light 12 after passing through the polarizing beam splitter 3. The polarization states of the first o light 11 and the first e light 12 undergo a first rotation after passing through the first half-wave plate 4, and then are collimated through the lens assembly 5, and then undergo a second rotation after passing through the Faraday rotator 6. After the second rotation of the polarization state, the first o light 11 and the first e light 12 are reflected back to the Faraday rotator 6 by the total reflection plate 7, and undergo a third rotation of the polarization state after passing through the Faraday rotator 6, and the first o light 11 is transformed into a second e light 14, and the first e light 12 is transformed into a second o light 13. The second o light 13 and the second e light 14 are coupled to each other after passing through the polarizing beam splitter 3 and enter the second optical fiber 2.

[0008] Preferably, when the optical signal is emitted from the second optical fiber 2, the optical signal is divided into a third o light 21 and a third e light 22 after passing through the polarizing beam splitter 3. The third o light 21 and the third e light 22 are collimated after passing through the lens assembly 5, and then the polarization state is rotated for the first time after passing through the Faraday rotator 6. The third o light 21 and the third e light 22 after the first rotation of the polarization state are reflected back to the Faraday rotator 6 by the total reflection plate 7, and the polarization state is rotated for the second time after passing through the Faraday rotator 6. The third o light 21 and the third e light 22 after the second rotation of the polarization state are rotated for the third time after passing through the first half-wave plate 4. The third o light 21 and the third e light 22 after the third rotation of the polarization state are emitted at an angle after passing through the polarizing beam splitter 3.

[0009] Preferably, the single-sided fiber-outlet integrated micro-optical device also includes a third optical fiber 8, and the third optical fiber 8, the first optical fiber 1 and the second optical fiber 2 are commonly arranged on the same side of the polarizing beam splitter 3, and the third optical fiber 8 is parallel to the first optical fiber 1 and the second optical fiber 2.

[0010] Preferably, the single-side fiber-outlet integrated micro-optical device further includes a second half-wave plate 9 , which is disposed between the polarizing beam splitter 3 and the lens assembly 5 and is located on the optical path of the third optical fiber 8 .

[0011] Preferably, the lens assembly 5 comprises: a collimating lens 51 and a filter 52, wherein:

[0012] The collimating lens 51 and the filter 52 are arranged in sequence, the collimating lens 51 faces the polarizing beam splitter 3 , and the filter 52 faces the Faraday rotator 6 .

[0013] Preferably, the third optical fiber 8 is used to emit pump light, and the pump light is divided into a fourth o light 81 and a fourth e light 82 after passing through the polarizing beam splitter 3. The polarization states of the fourth o light 81 and the fourth e light 82 undergo a first rotation after passing through the second half-wave plate 9. After the first rotation of the polarization state, the fourth o light 81 and the fourth e light 82 are collimated by the collimating light lens 51. The collimated fourth o light 81 and the fourth e light 82 are reflected back to the polarizing beam splitter 3 by the filter 52. After passing through the polarizing beam splitter 3, the fourth o light 81 and the fourth e light 82 are coupled to each other and enter the second optical fiber 2.

[0014] Preferably, the single-sided fiber-outlet integrated micro-optical device also includes a multi-core pin 10, which is located on one side of the polarizing beam splitter 3. The multi-core pin 10 includes at least three slots, and the first optical fiber 1, the second optical fiber 2 and the third optical fiber 8 are respectively arranged in the three slots.

[0015] Preferably, the polarizing beam splitter 3 is inclined at a preset angle relative to the optical path of the first optical fiber 1 and the optical path of the second optical fiber 2;

[0016] The preset angle is 84° to 86°.

[0017] Preferably, the single-side fiber-outlet integrated micro-optical device further comprises a magnetic ring 71 , one end of the magnetic ring 71 is sleeved on the outside of the lens assembly 5 , and the other end of the magnetic ring 71 is sleeved on the outside of the full-reflection film 7 .

[0018] The utility model provides a single-sided fiber-outlet integrated micro-optical device, wherein a first optical fiber 1 and a second optical fiber 2 are arranged at the same side of a polarizing beam splitter 3, and a lens assembly 5, a Faraday rotator 6 and a total reflection plate 7 are arranged in sequence on the other side of the polarizing beam splitter 3. After the optical signal emitted from the first optical fiber 1 passes through the polarizing beam splitter 3, the lens assembly 5, the Faraday rotator 6 and the total reflection plate 7 in sequence, it is reflected back by the total reflection plate 7 and received by the second optical fiber 2, thereby realizing the sending and receiving of signal light under single-sided fiber-outlet. The single-sided fiber-outlet makes the internal layout of the module more flexible, and a half-wave plate is also arranged on the optical path of the first optical fiber 1, which is used to isolate the optical signal returned from the second optical fiber 2 to the first optical fiber 1, thereby realizing the effect of an isolator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a single-side fiber-outlet integrated micro-optical device provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the optical path of a signal light of a single-side fiber-outlet integrated micro-optical device provided in an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the optical path of a signal light of another single-side fiber-outlet integrated micro-optical device provided in an embodiment of the utility model;

[0023] Figure 4 A schematic structural diagram of another single-side fiber-outlet integrated micro-optical device provided in an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of the optical path of pump light for a single-side fiber-outlet integrated micro-optical device provided in an embodiment of the utility model;

[0025] The diagram numbers are as follows:

[0026] First optical fiber 1; first o light 11; first e light 12; second o light 13; second e light 14; second optical fiber 2; third o light 21; third e light 22; polarizing beam splitter 3; first half-wave plate 4; lens assembly 5; collimating light lens 51; filter 52; Faraday rotation plate 6; total reflection plate 7; third optical fiber 8; fourth o light 81; fourth e light 82; second half-wave plate 9; multi-core pin 10; magnetic ring 71. DETAILED DESCRIPTION

[0027] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0028] The terms "first", "second", etc. in this utility model are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0029] In the present invention, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, the term "coupling" can be a way of achieving electrical connection for signal transmission.

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Embodiment 1:

[0032] Embodiment 1 of the present invention provides a single-side fiber-outlet integrated micro-optical device, such as Figure 1 As shown, it includes: a first optical fiber 1, a second optical fiber 2, a polarizing beam splitter 3, a first half-wave plate 4, a lens assembly 5, a Faraday rotator 6 and a total reflection plate 7, wherein:

[0033] The first optical fiber 1 and the second optical fiber 2 are arranged on the same side of the polarizing beam splitter 3, and the first optical fiber 1 and the second optical fiber 2 are parallel; the lens assembly 5, the Faraday rotation plate 6 and the total reflection plate 7 are arranged in sequence on the other side of the polarizing beam splitter 3, and the first half-wave plate 4 is arranged between the polarizing beam splitter 3 and the lens assembly 5, and is located on the optical path of the first optical fiber 1.

[0034] In this embodiment, the first optical fiber 1 and the second optical fiber 2 are arranged in the multi-core ferrule 10, the first optical fiber 1 is located above the second optical fiber 2, and the first optical fiber 1 and the second optical fiber 2 extend to the end face of the multi-core ferrule 10, and the end face of the multi-core ferrule 10 is arranged in contact with one side of the polarizing beam splitter 3, so that the emission or incident direction of the first optical fiber 1 and the second optical fiber 2 is opposite to the polarizing beam splitter 3. In this embodiment, the first optical fiber 1 is used to emit signal light, and the second optical fiber 2 is used to receive signal light; Figure 1 and Figure 2 As shown, the optical signal emitted by the first optical fiber 1 is reflected back by the total reflection plate 7 after passing through the first half-wave plate 4, the lens assembly 5 and the Faraday rotation plate 6 in sequence, and is received by the second optical fiber 2. The first optical fiber 1 and the second optical fiber 2 are arranged at the same side position to complete the transmission and reception of the optical signal, thereby achieving the effect of single-sided fiber output.

[0035] On the other hand, when the signal light is being transmitted, the second optical fiber 2 generates return light that is reflected back to the transmitting end, causing impurities in the signal light, thus affecting the transmission quality of the signal light. In this embodiment: Figure 1 and Figure 3 As shown, the polarizing beam splitter 3 can split the optical signal into o light and e light with perpendicular polarization states, wherein the o light is ordinary light and the e light is extraordinary light. The first half-wave plate 4 and the Faraday rotator 6 are used to rotate the polarization states of the o light and the e light. Since the first half-wave plate 4 is provided on the optical path of the first optical fiber 1, and no half-wave plate is provided on the optical path of the second optical fiber 2, the optical signal emitted by the first optical fiber 1 can be coupled and received by the second optical fiber 2, while the optical signal emitted by the second optical fiber 2 cannot be coupled and received by the first optical fiber 1, achieving the effect of optical path isolation, so that the single-side fiber-outlet integrated micro-optical device provided in this embodiment also has the effect of an isolator, preventing the return light generated by the second optical fiber 2 from affecting the quality of the signal light.

[0036] It should be noted that, in this embodiment, the Faraday rotator 6 is tilted and has a preset angle relative to the optical path of the optical signal emitted from the first optical fiber 1 and the second optical fiber 2 , and the preset angle may be 84° to 86°.

[0037] In order to further demonstrate the above isolation effect on the returning light, two scenarios are provided. In one scenario, the first optical fiber 1 is used as the output end, and the second optical fiber 2 is used as the input end. The optical path is as follows:

[0038] like Figure 1 and Figure 2 As shown, when the first optical fiber 1 emits an optical signal, the optical signal is divided into a first o-light 11 and a first e-light 12 after passing through the polarizing beam splitter 3. The polarization states of the first o-light 11 and the first e-light 12 are rotated for the first time after passing through the first half-wave plate 4, and then collimated after passing through the lens assembly 5. After passing through the Faraday rotator 6, the polarization states of the first o-light 11 and the first e-light 12 after the second rotation of the polarization states are reflected back to the Faraday rotator 6 by the total reflection plate 7. After passing through the Faraday rotator 6, the polarization states are rotated for the third time, and the first o-light 11 is transformed into a second e-light 14, and the first e-light 12 is transformed into a second o-light 13. After passing through the polarizing beam splitter 3, the second o-light 13 and the second e-light 14 are coupled to each other and enter the second optical fiber 2.

[0039] The optical signal is divided into a first o light 11 and a first e light 12 by the polarizing beam splitter 3, and the polarization states of the first o light 11 and the first e light 12 are perpendicular to each other. Figure 1 and Figure 2 As shown, the first o-light 11 is relatively in the lower position, and the first e-light 12 is relatively in the upper position; after the first o-light 11 and the first e-light 12 pass through the first half-wave plate 4, their respective polarization states rotate in the symmetric direction of the optical axis of the first half-wave plate 4; after passing through the lens assembly 5, they are collimated, and then after passing through the Faraday rotator 6, the polarization states of the first o-light 11 and the first e-light 12 rotate by 22.5±0.1 degrees. Similarly, after being reflected by the total reflection plate 7 and passing through the Faraday rotator 6 again, the polarization states of the first o-light 11 and the first e-light 12 rotate again by 22.5±0.1 degrees. Subsequently, after the second o-light 13 and the second e-light 14 pass through the polarizing beam splitter 3, Figure 2 For reference, the second o light 13 is deflected downward, and the second e light 14 is deflected upward, and is just coupled to the port of the second optical fiber 2.

[0040] In another scenario, the second optical fiber 2 is used as the first optical fiber 1, and the first optical fiber 1 is used as the second optical fiber 2. The optical path is as follows:

[0041] like Figure 1 and Figure 3As shown, when the optical signal is emitted from the second optical fiber 2, the optical signal is divided into a third o light 21 and a third e light 22 after passing through the polarizing beam splitter 3. The third o light 21 and the third e light 22 are collimated after passing through the lens assembly 5, and then the polarization state is rotated for the first time after passing through the Faraday rotator 6. The third o light 21 and the third e light 22 after the first rotation of the polarization state are reflected back to the Faraday rotator 6 by the total reflection plate 7, and the polarization state is rotated for the second time after passing through the Faraday rotator 6. The third o light 21 and the third e light 22 after the second rotation of the polarization state are rotated for the third time after passing through the first half-wave plate 4. The third o light 21 and the third e light 22 after the third rotation of the polarization state are emitted at an angle after passing through the polarizing beam splitter 3.

[0042] The optical signal is split into a third o light 21 and a third e light 22 by the polarizing beam splitter 3, and the polarization states of the third o light 21 and the third e light 22 are perpendicular to each other. Figure 3 In the embodiment, the third o light 21 is in a relatively lower position, and the third e light 22 is in a relatively upper position; it is collimated by the lens assembly 5, and then passes through the Faraday rotator 6, and the polarization states of the third o light 21 and the third e light 22 are rotated by 22.5±0.1 degrees. Similarly, after being reflected by the total reflection plate 7 and passing through the Faraday rotator 6 again, the polarization states of the third o light 21 and the third e light 22 are rotated by 22.5±0.1 degrees again. After passing through the first half-wave plate 4, the polarization state directions of the third o light 21 and the third e light 22 are respectively rotated in the direction of symmetry of the optical axis of the first half-wave plate 4. At this time, the third o light 21 is still o light, and the third e light 22 is still e light. After passing through the polarizing beam splitter 3, Figure 3 For reference, the third o light 21 is deflected upward, and the third e light 22 is deflected downward, and is emitted at an angle, and cannot be coupled into the first optical fiber 1 .

[0043] Embodiment 2:

[0044] Embodiment 2 of the present invention provides another single-side fiber-outlet integrated micro-optical device based on embodiment 1. On the basis of realizing the transmission of signal light, pump light can also be transmitted on the basis of single-side fiber-outlet to realize wavelength division multiplexing, involving the following designs:

[0045] like Figure 4 As shown, the single-side fiber-outlet integrated micro-optical device also includes a third optical fiber 8. The third optical fiber 8, the first optical fiber 1 and the second optical fiber 2 are arranged together on the same side of the polarizing beam splitter 3, and the third optical fiber 8 is parallel to the first optical fiber 1 and the second optical fiber 2.

[0046] In this embodiment, the third optical fiber 8 is also disposed in the multi-core ferrule 10 and is located below the second optical fiber 2 ; the third optical fiber 8 is used to emit pump light, and the second optical fiber 2 is used to receive pump light.

[0047] like Figure 4 As shown, the single-side fiber-outlet integrated micro-optical device also includes a second half-wave plate 9 , which is arranged between the polarizing beam splitter 3 and the lens assembly 5 and is located on the optical path of the third optical fiber 8 .

[0048] The lens assembly 5 comprises: a collimating lens 51 and a filter 52, wherein:

[0049] The collimating lens 51 and the filter 52 are arranged in sequence, the collimating lens 51 faces the polarizing beam splitter 3 , and the filter 52 faces the Faraday rotator 6 .

[0050] In this embodiment, the filter 52 allows the signal light to pass through and blocks the pump light. When the pump light reaches the filter 52, the filter 52 reflects the pump light.

[0051] When the third optical fiber 8 emits pump light and the second optical fiber 2 receives pump light, the corresponding optical path is as follows:

[0052] like Figure 4 and Figure 5 As shown, the third optical fiber 8 is used to emit pump light, and the pump light is divided into a fourth o light 81 and a fourth e light 82 after passing through the polarizing beam splitter 3. The polarization states of the fourth o light 81 and the fourth e light 82 undergo a first rotation after passing through the second half-wave plate 9. After the first rotation of the polarization state, the fourth o light 81 and the fourth e light 82 are collimated by the collimating light lens 51. The collimated fourth o light 81 and the fourth e light 82 are reflected back to the polarizing beam splitter 3 by the filter 52. After passing through the polarizing beam splitter 3, the fourth o light 81 and the fourth e light 82 are coupled to each other and enter the second optical fiber 2.

[0053] After the pump light passes through the polarizing beam splitter 3, the polarization states of the fourth o light 81 and the fourth e light 82 separated are perpendicular to each other. Figure 5 For reference, the fourth o light 81 is at the bottom and the fourth e light 82 is at the top. After the fourth o light 81 and the fourth e light 82 pass through the second half-wave plate 9, the polarization state directions of the fourth o light 81 and the fourth e light 82 are rotated in the symmetric direction of the optical axis. After the fourth o light 81 and the fourth e light 82 pass through the polarizing beam splitter 3, Figure 5 For reference, the fourth o light 81 is deflected downward, and the fourth e light 82 is deflected upward, and is coupled exactly into the second optical fiber 2 .

[0054] Since the pump light does not need to consider the interference of the returning light, the situation that the pump light of the second optical fiber 2 returns to the third optical fiber 8 does not need to be discussed.

[0055] like Figure 4As shown, the single-side fiber-outlet integrated micro-optical device further includes a magnetic ring 71 , one end of the magnetic ring 71 is sleeved on the outside of the lens assembly 5 , and the other end of the magnetic ring 71 is sleeved on the outside of the full-reflection film 7 .

[0056] The lens assembly 5 and the total reflection plate 7 are relatively fixed by the magnetic ring 71 , and the Faraday rotator 6 is fixed inside the magnetic ring 71 .

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A single-side fiber-outlet integrated micro-optical device, characterized in that: include: A first optical fiber (1), a second optical fiber (2), a polarizing beam splitter (3), a first half-wave plate (4), a lens assembly (5), a Faraday rotator (6) and a total reflection plate (7), wherein: The first optical fiber (1) and the second optical fiber (2) are arranged on the same side of the polarizing beam splitter (3), and the first optical fiber (1) and the second optical fiber (2) are parallel to each other; the lens assembly (5), the Faraday rotation plate (6) and the total reflection plate (7) are arranged in sequence on the other side of the polarizing beam splitter (3); the first half-wave plate (4) is arranged between the polarizing beam splitter (3) and the lens assembly (5), and is located on the optical path of the first optical fiber (1).

2. The single-side fiber-outlet integrated micro-optical device according to claim 1, characterized in that: When the first optical fiber (1) emits an optical signal, the optical signal is split into a first o light (11) and a first e light (12) after passing through the polarizing beam splitter (3); the polarization states of the first o light (11) and the first e light (12) are rotated for the first time after passing through the first half-wave plate (4); the first o light (11) and the first e light (12) are collimated after passing through the lens assembly (5); the polarization states of the first o light (11) and the first e light (12) are rotated for the second time after passing through the Faraday rotator (6); the polarization states of the first o light (11) and the first e light (12) after the second polarization state rotation are reflected back to the Faraday rotator (6) by the total reflection plate (7); the polarization states of the first o light (11) and the first e light (12) are rotated for the third time after passing through the Faraday rotator (6); the first o light (11) is transformed into a second e light (14); the first e light (12) is transformed into a second o light (13); the second o light (13) and the second e light (14) are coupled to each other after passing through the polarizing beam splitter (3) and enter the second optical fiber (2).

3. The single-side fiber-outlet integrated micro-optical device according to claim 1, characterized in that: When an optical signal is emitted from the second optical fiber (2), the optical signal is split into a third o light (21) and a third e light (22) after passing through the polarizing beam splitter (3); the third o light (21) and the third e light (22) are collimated after passing through the lens assembly (5); the polarization states of the third o light (21) and the third e light (22) are rotated for the first time after passing through the Faraday rotator (6); the third o light (21) and the third e light (22) after the first polarization state rotation are reflected back to the Faraday rotator (6) by the total reflection plate (7); the polarization states of the third o light (21) and the third e light (22) after the second polarization state rotation are rotated for the second time after passing through the first half-wave plate (4); the third o light (21) and the third e light (22) after the third polarization state rotation are emitted at an angle after passing through the polarizing beam splitter (3).

4. The single-side fiber-outlet integrated micro-optical device according to claim 1, characterized in that: The single-side fiber-outlet integrated micro-optical device further comprises a third optical fiber (8); the third optical fiber (8), the first optical fiber (1) and the second optical fiber (2) are arranged together at the same side of the polarizing beam splitter (3); the third optical fiber (8) is parallel to the first optical fiber (1) and the second optical fiber (2).

5. The single-side fiber-outlet integrated micro-optical device according to claim 4, characterized in that: The single-side fiber-outlet integrated micro-optical device also includes a second half-wave plate (9), which is arranged between the polarizing beam splitter (3) and the lens assembly (5) and is located on the optical path of the third optical fiber (8).

6. The single-side fiber-outlet integrated micro-optical device according to claim 5, characterized in that: The lens assembly (5) comprises: a collimating lens (51) and a filter (52), wherein: The collimating light lens (51) and the optical filter (52) are arranged in sequence, the collimating light lens (51) faces the polarizing beam splitter (3), and the optical filter (52) faces the Faraday rotator (6).

7. The single-side fiber-outlet integrated micro-optical device according to claim 6, characterized in that: The third optical fiber (8) is used to emit pump light. After passing through the polarizing beam splitter (3), the pump light is split into a fourth O light (81) and a fourth E light (82). After passing through the second half-wave plate (9), the polarization states of the fourth O light (81) and the fourth E light (82) undergo a first rotation. After the first rotation of the polarization states, the fourth O light (81) and the fourth E light (82) are collimated by the collimating light lens (51). The collimated fourth O light (81) and the fourth E light (82) are reflected back to the polarizing beam splitter (3) by the filter (52). After passing through the polarizing beam splitter (3), the fourth O light (81) and the fourth E light (82) are coupled to each other and enter the second optical fiber (2).

8. The single-side fiber-outlet integrated micro-optical device according to claim 4, characterized in that: The single-side fiber-outlet integrated micro-optical device further comprises a multi-core ferrule (10), wherein the multi-core ferrule (10) is located on one side of the polarizing beam splitter (3), and the multi-core ferrule (10) comprises at least three slots, wherein the first optical fiber (1), the second optical fiber (2) and the third optical fiber (8) are respectively arranged in the three slots.

9. The single-side fiber-outlet integrated micro-optical device according to any one of claims 1 to 8, characterized in that: The polarizing beam splitter (3) is inclined at a preset angle relative to the optical path of the first optical fiber (1) and the optical path of the second optical fiber (2); The preset angle is 84° to 86°.

10. The single-side fiber-outlet integrated micro-optical device according to any one of claims 1 to 8, characterized in that: The single-side fiber-outlet integrated micro-optical device further comprises a magnetic ring (71), one end of the magnetic ring (71) being sleeved on the outside of the lens assembly (5), and the other end of the magnetic ring (71) being sleeved on the outside of the total reflection film (7).

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