Optical Isolator
The optical isolator design addresses low utilization efficiency by using PBS prisms and half-wave plates for polarization splitting and path adjustment, enhancing crystal efficiency and reducing costs while enabling multi-port expansion.
Patent Information
- Application Number
- CN202111072589.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-09-13
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2041-09-13
AI Technical Summary
Existing optical isolators have low utilization efficiency of magneto-optical crystals, leading to high costs and manufacturing challenges due to the large aperture requirements of TGG crystals, which affect the uniformity of the extinction ratio and polarization rotation angle.
An optical isolator design that includes input and output components with PBS prisms and half-wave plates, allowing for polarization splitting and optical path adjustment, enabling multiple ports and reducing the need for a large magneto-optical rotation crystal by arranging it along a single optical path, thus improving utilization efficiency.
Enhances the utilization efficiency of magneto-optical crystals, reduces costs, and improves the uniformity of the crystal extinction ratio while allowing for multi-port expansion and symmetric packaging.
Smart Images
Figure CN113885231B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of optical devices, and in particular to an optical isolator. Background Art
[0002] In high-power laser systems, in order to prevent the return light from returning to the system and affecting the stable operation of the laser or even destroying the internal components of the laser, it is often necessary to add an optical isolator so that the light can only pass in one direction. An optical isolator is a directional passive device that allows light to pass in one direction but prevents it from passing in the opposite direction. It can be used in fields such as optical communications and optical measurements. If the light energy returned in the fiber laser system is strong, it may cause the performance of the entire system to drop sharply or even burn the entire system. An optical isolator is a directional passive device that allows light to pass in one direction but prevents it from passing in the opposite direction. It can be used in fields such as optical communications and optical measurements. Therefore, it is necessary to add an optical isolation device in the optical path to filter out as much of this return light as possible to avoid its impact on the laser system and improve the stability of the system output.
[0003] Existing optical isolators mainly include transmissive single-stage isolators, transmissive multi-stage isolators, reflective single-stage isolators and reflective multi-stage isolators. A key component in the isolator is a magneto-rotation element. The core component of the optical isolator is a Faraday rotator crystal (TGG crystal). The TGG crystal accounts for the main cost of the optical isolator. Conventional optical fiber isolators use a circular TGG crystal. Both polarized beams pass through the same TGG crystal. Therefore, a large-aperture TGG crystal is required to meet the transmission of the light beam. Under normal circumstances, the polarized beam passes through a TGG crystal, and the utilization ratio of the TGG crystal aperture is ≤10%. It can be seen that the utilization rate is very low.
[0004] In addition, as the aperture of the TGG crystal increases, the purchase price increases almost squarely. At the same time, the TGG crystal with an increased diameter has greater requirements for its manufacturing process, specifically the material uniformity of the TGG crystal, which generally affects the uniformity of the TGG crystal extinction ratio ER and the consistency of the polarization rotation angle. Inconsistent rotation angles will affect forward loss and reverse isolation. In addition, due to cost constraints and process limitations of Faraday rotator crystals, the port expansion of optical isolators is also limited to a certain extent. Summary of the invention
[0005] The object of the present invention is to provide an optical isolator which can improve the utilization efficiency of magneto-optical crystals.
[0006] In order to achieve the purpose of the present invention, the present invention provides an optical isolator, comprising a first input component, a second input component, a first output component, a second output component, a magneto-optical rotation crystal, a first optical path adjustment PBS prism, a second optical path adjustment PBS prism and an optical rotation half-wave plate, wherein the first input component comprises a first input port group, a first input PBS prism and a first input half-wave plate arranged in sequence, the first input PBS prism is provided with two mutually parallel first input dielectric films, the two first input dielectric films are distributed along a first separation and combination direction, the first input port group comprises a first input collimator, the first input collimator faces one of the first input dielectric films, the second input component comprises a second input port group, a second input PBS prism and a second output The first output assembly comprises a first output port group, a first output PBS prism and a first output half-wave plate, the first output PBS prism is provided with two mutually parallel second input dielectric films, the two second input dielectric films are distributed along the first splitting and combining direction, the second input port group comprises a second input collimator, and the second input collimator faces one of the second input dielectric films; the first output assembly comprises a first output port group, a first output PBS prism and a first output half-wave plate arranged in sequence, the first output PBS prism is provided with two mutually parallel first output dielectric films, the two first output dielectric films are distributed along the first splitting and combining direction, the first output port group comprises a first output collimator, and the first output collimator faces one of the first output dielectric films; the second output assembly comprises a second output port group, a second output PBS prism and a second output half-wave plate arranged in sequence The output half-wave plate is provided on the second output PBS prism, and two second output dielectric films are parallel to each other, and the two second output dielectric films are distributed along the first splitting and combining direction. The second output port group includes a second output collimator, and the second output collimator faces one of the second output dielectric films. A magnet is provided on the periphery of the magneto-optical rotation crystal. The first optical path adjustment PBS prism is provided with a first adjustment dielectric film and a second adjustment dielectric film parallel to each other, and the first adjustment dielectric film and the second adjustment dielectric film are distributed along the second splitting and combining direction. The second optical path adjustment PBS prism is provided with a third adjustment dielectric film and a fourth adjustment dielectric film parallel to each other, and the third adjustment dielectric film and the fourth adjustment dielectric film are distributed along the second splitting and combining direction. The second input PBS prism, the second input half-wave plate, the second adjustment dielectric film and the second adjustment dielectric film are distributed along the second splitting and combining direction. The plasma film, the magneto-optical rotation crystal, the optical rotation half-wave plate, the fourth adjustment dielectric film, the second output half-wave plate, and the second output PBS prism are arranged in sequence along the first optical path; the first input PBS prism, the first input half-wave plate, and the first adjustment dielectric film are arranged in sequence along the second optical path; the third adjustment dielectric film, the first output half-wave plate, and the first output PBS prism are arranged in sequence along the third optical path; the first optical path, the second optical path, and the third optical path are parallel; the first splitting and combining direction is perpendicular to the second splitting and combining direction; and the second splitting and combining direction is perpendicular to the first optical path; the first input dielectric film, the second input dielectric film, the first output dielectric film, the second output dielectric film, the first adjustment dielectric film, the second adjustment dielectric film, the third adjustment dielectric film, and the fourth adjustment dielectric film are all polarization splitting dielectric films.
[0007] It can be seen from the above scheme that the optical fiber is polarized and combined by the input / output PBS prism, and the optical path is adjusted by the first / second optical path adjustment PBS prism, and then the light is converged on the first optical path to pass through the magneto-optical rotation crystal and realize the corresponding optical rotation, so that the light input from different ports all passes through the magneto-optical rotation crystal and is output from the corresponding different ports, thereby greatly improving the utilization efficiency of the magneto-optical rotation crystal. Since the magneto-optical rotation crystal only needs to be arranged along the first optical path, the magneto-optical rotation crystal can be made relatively small and does not need to cover the entire area, thereby greatly reducing the cost and also facilitating improving the uniformity of the crystal extinction ratio ER.
[0008] A further solution is that the first input port group includes a plurality of first input collimators distributed along the second splitting and combining direction, and the plurality of first input collimators are all oriented toward the same first input dielectric film.
[0009] In a further embodiment, the first input port group includes a first aperture, and the first aperture is arranged between the first input collimator and the first input PBS prism.
[0010] A further solution is that the second input port group includes a plurality of second input collimators distributed along the second splitting and combining direction, and the plurality of second input collimators are all oriented toward the same second input dielectric film.
[0011] In a further embodiment, the second input port group includes a second aperture, and the second aperture is arranged between the second input collimator and the second input PBS prism.
[0012] A further solution is that the first output port group includes a plurality of first output collimators distributed along the second splitting and combining direction, and the plurality of first output collimators are all oriented toward the same first output dielectric film.
[0013] In a further embodiment, the first output port group includes a third aperture, and the third aperture is arranged between the first output collimator and the first output PBS prism.
[0014] A further solution is that the second output port group includes a plurality of second output collimators distributed along the second splitting and combining direction, and the plurality of second output collimators are all oriented toward the same second output dielectric film.
[0015] In a further embodiment, the second output port group includes a fourth aperture, and the fourth aperture is arranged between the second output collimator and the second output PBS prism.
[0016] It can be seen from the above that since the first / second optical path adjustment PBS prism can converge and separate the optical paths, the input collimators or output collimators in the first input component, the second input component, the first output component and the second output component can be expanded according to actual needs, and multi-port expansion applications can be achieved by adjusting the transmission or reflection of the dielectric film.
[0017] A further solution is that the second adjustment dielectric film is perpendicular to the fourth adjustment dielectric film.
[0018] It can be seen from the above that the second adjustment dielectric film is perpendicular to the fourth adjustment dielectric film, and thus the input port and the output port of the isolator are arranged symmetrically, which is beneficial to the packaging of the isolator housing and the port connection. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 1 is a top view of the structure of the first embodiment of the optical isolator of the present invention.
[0020] Figure 2 It is a side structural diagram of the first input component in the first embodiment of the optical isolator of the present invention.
[0021] Figure 3 It is a side structural diagram of the second output component in the first embodiment of the optical isolator of the present invention.
[0022] Figure 4 It is a side structural diagram of the second input component in the first embodiment of the optical isolator of the present invention.
[0023] Figure 5 It is a side structural diagram of the first output component in the first embodiment of the optical isolator of the present invention.
[0024] Figure 6 This is a first optical path transmission state diagram of the first embodiment of the optical isolator of the present invention.
[0025] Figure 7 It is a second optical path transmission state diagram of the first embodiment of the optical isolator of the present invention.
[0026] Figure 8 1 is a top view of the structure of the second embodiment of the optical isolator of the present invention.
[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION
[0028] Optical isolator first embodiment:
[0029] Reference Figure 1 , Figure 1It is a top view of the optical isolator, which includes a first input component, a second input component, a first output component, a second output component, a magneto-optical rotation crystal 16, a magnet 17, a first optical path adjustment PBS prism 31, a second optical path adjustment PBS prism 32 and an optical rotation half-wave plate 185.
[0030] Reference Figure 2 , Figure 2 It is a side view structural diagram of the first input component, which includes a first input port group, a first input PBS prism 21 and a first input half-wave plate 181 arranged in sequence. The first input PBS prism 21 is provided with two mutually parallel first input dielectric films 211, and the two first input dielectric films 211 are distributed along the first separation and combination direction Z. The first input port group includes a first input collimator 11 and a first aperture 151. The first input collimator 11 faces a first input dielectric film 211 located on the lower side, and the first aperture 151 is arranged between the first input collimator 11 and the first input dielectric film 211 of the first input PBS prism 21.
[0031] Reference Figure 3 , Figure 3 1 is a side view structural diagram of the second output component, which includes a second output port group, a second output PBS prism 24 and a second output half-wave plate 184 arranged in sequence. The second output PBS prism 24 is provided with two second output dielectric films 241 parallel to each other, and the two second output dielectric films 241 are distributed along the first separation and combination direction Z. The second output port group includes a second output collimator 14 and a fourth aperture 154. The second output collimator 14 faces a second output dielectric film 241 located on the upper side, and the fourth aperture 154 is arranged between the second output collimator 14 and the second output dielectric film 241 of the second output PBS prism 24.
[0032] Reference Figure 4 , Figure 4 It is a side view structural diagram of the second input component, which includes a second input port group, a second input PBS prism 22 and a second input half-wave plate 182 arranged in sequence. The second input PBS prism 22 is provided with two second input dielectric films 221 parallel to each other, and the two second input dielectric films 221 are distributed along the first separation and combination direction Z. The second input port group includes a second input collimator 12 and a second diaphragm 152. The second input collimator 12 faces a second input dielectric film 221 located on the lower side, and the second diaphragm 152 is arranged between the second input collimator 12 and the second input dielectric film 221 of the second input PBS prism 22.
[0033] Reference Figure 5 , Figure 5It is a side view structural diagram of the first output component, which includes a first output port group, a first output PBS prism 23 and a first output half-wave plate 183 arranged in sequence. The first output PBS prism 23 is provided with two mutually parallel first output dielectric films 231, and the two first output dielectric films 231 are distributed along the first separation and combination direction Z. The first output port group includes a first output collimator 13 and a third aperture 153. The first output collimator 13 faces a first output dielectric film 231 located on the upper side, and the third aperture 153 is arranged between the first output collimator 13 and the third adjustment dielectric film 321 of the first output PBS prism 23.
[0034] The first optical path adjustment PBS prism 31 is located on a side close to the first input component and the second input component. The first optical path adjustment PBS prism 31 is provided with a first adjustment dielectric film 311 and a second adjustment dielectric film 312 which are parallel to each other. The first adjustment dielectric film 311 and the second adjustment dielectric film 312 are distributed along the second separation and combination direction Y. The second optical path adjustment PBS prism 32 is located on a side close to the first output component and the second output component. The second optical path adjustment PBS prism 32 is provided with a third adjustment dielectric film 321 and a fourth adjustment dielectric film 322 which are parallel to each other. The third adjustment dielectric film 321 and the fourth adjustment dielectric film 322 are distributed along the second separation and combination direction Y.
[0035] The magneto-optical rotatory crystal 16 and the optical rotatory half-wave plate 185 are arranged between the first optical path adjustment PBS prism 31 and the second optical path adjustment PBS prism 32. The magnet 17 is arranged on the periphery of the magneto-optical rotatory crystal 16 and provides a magnetic field for the magneto-optical rotatory crystal 16. The magneto-optical rotatory crystal 16 adopts a Faraday optical rotatory crystal (TGG crystal).
[0036] Reference Figure 1 , and combined with Figures 2 to 5 The second input PBS prism 22, the second input half-wave plate 182, the second adjustment dielectric film 312, the magneto-optical rotatory crystal 16, the optical rotatory half-wave plate 185, the fourth adjustment dielectric film 322, the second output half-wave plate 184, and the second output PBS prism 24 are sequentially arranged along the first optical path X1 direction, and the second input half-wave plate 182, the magneto-optical rotatory crystal 16, the optical rotatory half-wave plate 185, and the second output half-wave plate 184 all extend in the first splitting and combining direction Z and have a certain height, so that the light transmitted or reflected from the two second input dielectric films 221 and the two second output dielectric films 241 can pass through the second input half-wave plate 182, the magneto-optical rotatory crystal 16, the optical rotatory half-wave plate 185, and the second output half-wave plate 184.
[0037] The first input PBS prism 21, the first input half-wave plate 181 and the first adjustment dielectric film 311 are sequentially arranged along the second optical path X2 direction, and the first input half-wave plate 181 and the first adjustment dielectric film 311 both extend in the first separation and combination direction Z and have a certain height, so that the light transmitted or reflected by the two first input dielectric films 211 can pass through the first input half-wave plate 181 and the first adjustment dielectric film 311. The third adjustment dielectric film 321, the first output half-wave plate 183 and the first output PBS prism 23 are sequentially arranged along the third optical path X3 direction, and the third adjustment dielectric film 321 and the first output half-wave plate 183 both extend in the first separation and combination direction Z and have a certain height, so that the light passing through the third adjustment dielectric film 321 and the first output half-wave plate 183 is incident on the first output dielectric film 231, and then transmitted or reflected by the first output dielectric film 231.
[0038] The first optical path X1, the second optical path X2 and the third optical path X3 are parallel, the first splitting and combining direction Z is perpendicular to the second splitting and combining direction Y, and the second splitting and combining direction Y is perpendicular to the first optical path X1. In actual use, the first optical path X1, the second optical path X2, the third optical path X3 and the second splitting and combining direction Y can be arranged in the horizontal direction, and the first splitting and combining direction Z can be arranged in the vertical direction. Figure 1 The second adjustment dielectric film 312 is perpendicular to the fourth adjustment dielectric film 322, and then by adjusting the optical path, the collimators of the first input component, the second input component, the first output component, and the second output component can be arranged symmetrically on both sides.
[0039] In addition, the first input dielectric film 211 , the second input dielectric film 221 , the first output dielectric film 231 , the second output dielectric film 241 , the first adjustment dielectric film 311 , the second adjustment dielectric film 312 , the third adjustment dielectric film 321 and the fourth adjustment dielectric film 322 are all polarization splitting dielectric films.
[0040] Reference Figure 6 , and combined with Figure 2 and Figure 3 , Figure 6The figure shows the polarization states of light in different devices when the light is transmitted forward and backward. When the light is transmitted forward from Port 1 to Port 4, the light is input from the first input collimator 11, passes through the first aperture 151 and is incident on the first input PBS prism 21. After polarization splitting, the two polarization split beams are separated along the first splitting and combining direction Z and are respectively transmitted along the second optical path X2. The two polarization split beams are incident on the first adjustment dielectric film 311. After being reflected by the first adjustment dielectric film 311, the two polarization split beams are transmitted along the second splitting and combining direction Y and are incident on the second adjustment dielectric film 312. After being reflected by the second adjustment dielectric film 312, the two polarization split beams pass through the magneto-optical rotation crystal 16, the optical rotation half-wave plate 185, the fourth adjustment dielectric film 322 and the second output half-wave plate 184 in sequence and are incident on the second output PBS prism 24. After being combined by the two second output dielectric films 241 of the second output PBS prism 24, the two polarization split beams are coupled into the second output collimator 14 for output, thereby realizing the forward transmission from the P1 to P4 ports.
[0041] When return light returns from the second output collimator 14, the return light passes through the polarization splitting of the second output PBS prism 24, the fourth adjustment dielectric film 322, the optical rotation half-wave plate 185, the magneto-optical rotation crystal 16, the second adjustment dielectric film 312, the second input half-wave plate 182 in sequence, and then passes through the second input PBS prism 22 for light combination before hitting the second aperture 152, thereby preventing the return light from entering the laser system, thereby achieving reverse isolation from the P4 to P2 port.
[0042] Reference Figure 7 , and combined with Figure 4 and Figure 5 , Figure 7 The figure shows the polarization states of light in different devices when the light is transmitted forward and backward. When the light is transmitted forward from Port2 to Port3, the light is input from the second input collimator 12, passes through the second aperture 152 and is incident on the second input PBS prism 22. After polarization splitting, the two polarization split beams are separated along the second splitting and combining direction Z and are respectively transmitted along the first optical path X1. The two polarization split beams sequentially pass through the second input half-wave plate 182, the second adjustment dielectric film 312, the magneto-optical rotation crystal 16, the optical rotation half-wave plate 185, and the fourth adjustment dielectric film 322, respectively, and are reflected by the fourth adjustment dielectric film 322 and the third adjustment dielectric film 321, and then pass through the first output half-wave plate 183 and are incident on the first output PBS prism 23. After the light is combined by the first output PBS prism 23, it is coupled into the first output collimator 13 for output, thereby realizing the forward transmission from the P2 to P3 ports.
[0043] When return light returns from the first output collimator 13, the return light passes through the polarization splitting of the first output PBS prism 23, the reflection of the third adjustment dielectric film 321 and the fourth adjustment dielectric film 322, the optical rotation half-wave plate 185, the magneto-optical rotation crystal 16, the reflection of the second adjustment dielectric film 312 and the first adjustment dielectric film 311, the first input half-wave plate 181, and then passes through the first input PBS prism 21 to combine the light and hit the first aperture 151, so as to prevent the return light from entering the laser system, thereby realizing reverse isolation from the P3 to P1 port.
[0044] Optical isolator second embodiment:
[0045] Reference Figure 8 , Figure 8 : is a top view of the second embodiment of the optical isolator. On the basis of the first embodiment, the number of input collimators or output collimators in the first input port, the second input port group, the first output port and the second output port group can be adjusted according to the actual port requirements, that is, the first input port group includes a plurality of first input collimators 11 distributed along the second separation and combination direction Y, and the plurality of first input collimators 11 are all facing the same first input dielectric film 211. The second input port group includes a plurality of second input collimators 12 distributed along the second separation and combination direction Y, and the plurality of second input collimators 12 are all facing the same second input dielectric film 221. The first output port group includes a plurality of first output collimators 13 distributed along the second separation and combination direction Y, and the plurality of first output collimators 13 are all facing the same first output dielectric film 231. The second output port group includes a plurality of second output collimators 14 distributed along the second separation and combination direction Y, and the plurality of second output collimators 14 are all facing the same second output dielectric film 241.
[0046] Of course, multiple different input collimators can be oriented toward different input dielectric films, and multiple different output collimators can be oriented toward different output dielectric films, which are specifically arranged according to the setting of the optical path, and can also achieve forward transmission and reverse isolation. The aperture can be arranged in an integral or discrete manner. The integral aperture is provided with multiple through holes, which correspond to the central axis of the collimator, and the discrete aperture corresponds to the collimator one by one. In addition, in addition to one prism to multiple collimators, the input PBS prism and the output PBS prism can also correspond to one prism to one collimator. As long as the multiple collimators are all oriented toward the adjustment dielectric film, the optical path can be converged and separated, thereby achieving a shared magneto-optical crystal to improve the utilization efficiency of the magneto-optical crystal. At the same time, the magneto-optical crystal can be made relatively small and does not need to cover the entire area, which can greatly reduce the cost and is also conducive to improving the uniformity of the crystal extinction ratio ER.
Claims
1. An optical isolator, characterized in that include: The first input component comprises a first input port group, a first input PBS prism and a first input half-wave plate arranged in sequence, the first input PBS prism is provided with two mutually parallel first input dielectric films, the two first input dielectric films are distributed along a first splitting and combining direction, the first input port group comprises a first input collimator, and the first input collimator faces one of the first input dielectric films; The second input component comprises a second input port group, a second input PBS prism and a second input half-wave plate arranged in sequence, the second input PBS prism is provided with two second input dielectric films parallel to each other, the two second input dielectric films are distributed along the first splitting and combining direction, the second input port group comprises a second input collimator, and the second input collimator faces one of the second input dielectric films; A first output component includes a first output port group, a first output PBS prism and a first output half-wave plate arranged in sequence, wherein the first output PBS prism is provided with two mutually parallel first output dielectric films, the two first output dielectric films are distributed along the first splitting and combining direction, the first output port group includes a first output collimator, and the first output collimator faces one of the first output dielectric films; The second output component includes a second output port group, a second output PBS prism and a second output half-wave plate arranged in sequence, the second output PBS prism is provided with two second output dielectric films parallel to each other, the two second output dielectric films are distributed along the first splitting and combining direction, the second output port group includes a second output collimator, and the second output collimator faces one of the second output dielectric films; A magneto-optical rotation crystal, wherein a magnet is arranged on the periphery of the magneto-optical rotation crystal; A first optical path adjustment PBS prism, wherein the first optical path adjustment PBS prism is provided with a first adjustment dielectric film and a second adjustment dielectric film parallel to each other, and the first adjustment dielectric film and the second adjustment dielectric film are distributed along a second separation and combination direction; A second optical path adjustment PBS prism, wherein the second optical path adjustment PBS prism is provided with a third adjustment dielectric film and a fourth adjustment dielectric film parallel to each other, and the third adjustment dielectric film and the fourth adjustment dielectric film are distributed along the second splitting and combining direction; The optical rotation half-wave plate, the second input PBS prism, the second input half-wave plate, the second adjustment dielectric film, the magneto-optical rotation crystal, the optical rotation half-wave plate, the fourth adjustment dielectric film, the second output half-wave plate, and the second output PBS prism are sequentially arranged along the first optical path direction; The first input PBS prism, the first input half-wave plate and the first adjustment dielectric film are arranged in sequence along the second optical path, the third adjustment dielectric film, the first output half-wave plate and the first output PBS prism are arranged in sequence along the third optical path, the first optical path, the second optical path and the third optical path are parallel, the first splitting and combining direction is perpendicular to the second splitting and combining direction, and the second splitting and combining direction is perpendicular to the first optical path; The first input dielectric film, the second input dielectric film, the first output dielectric film, the second output dielectric film, the first adjustment dielectric film, the second adjustment dielectric film, the third adjustment dielectric film and the fourth adjustment dielectric film are all polarization splitting dielectric films.
2. The optical isolator according to claim 1, characterized in that: The first input port group includes a plurality of the first input collimators distributed along the second splitting and combining direction, and the plurality of the first input collimators are all facing the same first input dielectric film.
3. The optical isolator according to claim 1, characterized in that: The first input port set includes a first aperture disposed between the first input collimator and the first input PBS prism.
4. The optical isolator according to claim 1, characterized in that: The second input port group includes a plurality of second input collimators distributed along the second splitting and combining direction, and the plurality of second input collimators are all oriented toward the same second input dielectric film.
5. The optical isolator according to claim 1, characterized in that: The second input port set includes a second aperture disposed between the second input collimator and the second input PBS prism.
6. The optical isolator according to claim 1, characterized in that: The first output port group includes a plurality of the first output collimators distributed along the second splitting and combining direction, and the plurality of the first output collimators are all oriented toward the same first output dielectric film.
7. The optical isolator according to claim 1, characterized in that: The first output port group includes a third aperture, and the third aperture is disposed between the first output collimator and the first output PBS prism.
8. The optical isolator according to claim 1, characterized in that: The second output port group includes a plurality of second output collimators distributed along the second splitting and combining direction, and the plurality of second output collimators are all oriented toward the same second output dielectric film.
9. The optical isolator according to claim 1, characterized in that: The second output port group includes a fourth aperture disposed between the second output collimator and the second output PBS prism.
10. The optical isolator according to any one of claims 1 to 9, characterized in that: The second adjustment dielectric film is perpendicular to the fourth adjustment dielectric film.