CN117406461A - Adjustable light branching unit - Google Patents

Abstract

The invention relates to the technical field of optical communication, in particular to an adjustable optical splitter. Comprising the following steps: the system comprises an incident collimator, a first corner PBS module, an adjustable phase retarder, a second corner PBS module, a third corner PBS module, a PBS cube and an emergent module; the first corner PBS module is arranged on one side of the adjustable phase retarder, the second corner PBS module is arranged on one side of the adjustable phase retarder, which is away from the first corner PBS module, the third corner PBS module is arranged adjacent to the second corner PBS module, the PBS cube is arranged adjacent to the third corner PBS module, and the emergent module is arranged corresponding to the third corner PBS module and the PBS cube; the emergent module comprises a first emergent collimator and a second emergent collimator, and light signals incident from the incident collimator are split and combined under the combined action of the modules and then are emergent from the first emergent collimator and the second emergent collimator respectively. The adjustable light branching device solves the problems that in the prior art, the structure of the adjustable light branching device is complex, the coupling of devices is difficult, and the cost is high.

Description

Adjustable light branching unit

Technical Field

The invention relates to the technical field of optical communication, in particular to an adjustable optical splitter.

Background

The optical splitter is one of optical devices commonly used in the optical field, and particularly has important positions in the fields of optical communication, optical sensing and the like related to optical fiber optics. The optical branching principle commonly used at present comprises an optical fiber fusion technology, an NPBS based on a film coating technology, an optical chip and other technologies, and the technologies can support fixed optical branching functions, however, with the development of the fields of optical communication and the like, the requirement of an adjustable optical branching device technology with adjustable polarization and irrelevant is proposed.

Chinese patent CN100423477C shows an adjustable optical power splitter, which provides a method based on liquid crystal and birefringent crystal, but because the birefringent crystal has a high price, and the optical path shown in the invention is a three-dimensional optical path, this also results in difficulty in coupling devices, which is unfavorable for production and popularization, and the PBS in the patent replaces the scheme of the birefringent crystal, which makes the overall structure complex and the cost high.

Disclosure of Invention

The technical problem to be solved by the embodiment of the invention is to provide the adjustable optical splitter so as to solve the problems of complex structure, difficult device coupling and high cost of the adjustable optical splitter in the prior art.

The invention discloses a tunable optical splitter, which comprises: the system comprises an incident collimator, a first corner PBS module, an adjustable phase retarder, a second corner PBS module, a third corner PBS module, a PBS cube and an emergent module; the first corner PBS module is arranged on one side of the adjustable phase retarder, the second corner PBS module is arranged on one side of the adjustable phase retarder, which is away from the first corner PBS module, the third corner PBS module is arranged adjacent to the second corner PBS module, the PBS cube is arranged adjacent to the third corner PBS module, and the emergent module is arranged corresponding to the third corner PBS module and the PBS cube; the light signals incident from the incident collimator are respectively emitted from the first emergent collimator and the second emergent collimator after being split and combined under the combined action of the first corner PBS module, the adjustable phase retarder, the second corner PBS module, the third corner PBS module and the PBS cube.

Optionally, the first corner PBS module includes a first substrate, a first light splitting film and a first corner reflector disposed on the first substrate, and a first half-wave plate corresponding to the first corner reflector, where the first light splitting film is configured to transmit P light and reflect S light, and the first corner reflector is configured to reflect S light; the light signal which is incident to the first matrix from the incidence collimator is split by the first light splitting film, the P light is directly transmitted to the phase retarder, the S light is reflected by the first corner reflector and then is incident to the first half wave plate, and the P light is converted into the P light to be incident to the adjustable phase retarder.

Optionally, the adjustable phase retarder is disposed corresponding to the first rotation angle PBS module; the P light emitted from the first half wave plate to the adjustable phase retarder becomes elliptical polarized light after passing through the adjustable phase retarder, and the P light emitted from the first substrate to the adjustable phase retarder becomes elliptical polarized light after passing through the adjustable phase retarder.

Optionally, the second corner PBS module includes a second substrate, a second light splitting film and a second corner reflecting mirror disposed on the second substrate, and a second half-wave plate corresponding to the second light splitting film, where the second light splitting film is configured to transmit S light and reflect P light, and the second corner reflecting mirror is configured to reflect S light; and after the light signal emitted from the phase retarder to the second substrate is split by the second light splitting film, the P light is reflected to the second half wave plate and converted into S light to be incident to the third corner PBS module, and the S light is reflected by the second corner reflector and then is incident to the PBS cube.

Optionally, the third corner PBS module includes a third substrate, a third light splitting film and a third corner reflector disposed on the third substrate, and a third half-wave plate corresponding to the third corner reflector, where the third light splitting film is configured to transmit P light and reflect S light, and the third corner reflector is configured to reflect S light; s light emitted from the second half-wave plate to the third matrix is reflected to the emission module by the third light splitting film, light signals emitted from the phase retarder to the third matrix are split by the third light splitting film, P light is directly transmitted to the first emission collimator, S light is reflected to the third corner reflector and reflected to the third half-wave plate by the third corner reflector, and P light is emitted to the PBS cube; the first emergent collimator receives elliptical polarized light formed by P light and S light emitted by the third matrix.

Optionally, a fourth light splitting film is arranged in the PBS cube, wherein the fourth light splitting film is used for transmitting P light and reflecting S light; the S light emitted to the PBS cube from the second corner reflector is reflected by the fourth light splitting film and then enters the emitting module, and the P light emitted to the PBS cube from the third half-wave plate is directly transmitted to the second emitting collimator after passing through the fourth light splitting film; and the second emergent collimator receives elliptical polarization formed by P light and S light emergent from the PBS cube.

Optionally, the incident collimator, the first exit collimator and the second exit collimator are pigtails with collimating lenses.

Optionally, the PBS cube is a coated-based PBS cube glass element.

Optionally, the working wavelength of the first half-wave plate corresponds to the wavelength of the outgoing light reflected by the first corner reflecting mirror, the working wavelength of the second half-wave plate corresponds to the wavelength of the outgoing light reflected by the second light splitting film, and the working wavelength of the third half-wave plate corresponds to the wavelength of the outgoing light reflected by the third corner reflecting mirror.

Optionally, the adjustable phase retarder is an adjustable angle rotatable wave plate, or an adjustable phase liquid crystal phase retarder, an electro-optic crystal, an electro-optic ceramic, or the like.

Compared with the prior art, the adjustable optical splitter provided by the embodiment of the invention has the beneficial effects that: the incidence collimator is used for introducing the optical signal into the adjustable optical splitter, and the first corner PBS module is adjacent to the incidence collimator and used for dividing the optical signal into two branches; the adjustable phase retarder is positioned at one side of the first rotation angle PBS module and is used for controlling the phase retardation of the optical signal; the second corner PBS module is positioned at one side of the adjustable phase retarder, which is away from the first corner PBS module, and is used for receiving one beam of light signals emitted by the adjustable phase retarder; the third corner PBS module is arranged adjacent to the second corner PBS module and is used for receiving the other beam of light signals emitted by the adjustable phase retarder and the S-light signals emitted by the second corner PBS; the PBS cube is arranged adjacent to the third corner PBS module and is used for combining the light signals emitted by the second corner PBS module with the light signals emitted by the third corner PBS module; the emergent module comprises a first emergent collimator and a second emergent collimator, and is used for outputting optical signals from the adjustable optical splitter. The optical signal beam splitting with different splitting ratios can be realized by adjusting the adjustable phase delay device, and the adjustable phase delay device can control the phase delay of the optical signal so as to realize the adjustment and control of the phase of the optical signal. Through the design, the adjustable optical splitter can realize better optical signal splitting and beam combination, reduces optical loss and distortion, and utilizes the corner PBS and the adjustable phase retarder to realize optical signal splitting and beam combination in the adjustable optical splitter, so that the adjustable optical splitter has simpler structure and lower cost.

Drawings

The technical scheme of the invention will be further described in detail below with reference to the accompanying drawings and examples, wherein:

fig. 1 is a schematic structural diagram of an adjustable optical splitter according to an embodiment of the present invention.

The reference numerals in the drawings are as follows:

1000. a tunable optical splitter; 100. an incident collimator; 200. a first corner PBS module; 201. a first substrate; 202. a first light-splitting film; 203. a first corner mirror; 204. a first half-wave plate; 300. an adjustable phase retarder; 400. a second corner PBS module; 401. a second substrate; 402. a second light splitting film; 403. a second corner mirror; 404. a second half-wave plate; 500. a third corner PBS module; 501. a third substrate; 502. a third light-splitting film; 503. a third corner mirror; 504. a third half-wave plate; 600. PBS cube; 601. a fourth light-splitting film; 700. an exit module; 701. a first exit collimator; 702. and a second exit collimator.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

An embodiment of the present invention provides a tunable optical splitter 1000, as shown in fig. 1, the tunable optical splitter 1000 includes: an incident collimator 100, a first corner PBS module 200, an adjustable phase retarder 300, a second corner PBS module 400, a third corner PBS module 500, a PBS cube 600, and an exit module 700; the first corner PBS module 200 is arranged on one side of the adjustable phase retarder 300, the second corner PBS module 400 is arranged on one side of the adjustable phase retarder 300, which faces away from the first corner PBS module 200, the third corner PBS module 500 is arranged adjacent to the second corner PBS module 400, the PBS cube 600 is arranged adjacent to the third corner PBS module 500, and the emergent module 700 is arranged corresponding to the third corner PBS module 500 and the PBS cube 600; the exit module 700 includes a first exit collimator 701 and a second exit collimator 702, and the light signal incident from the incident collimator 100 is split and combined under the combined action of the first angular PBS module 200, the adjustable angular retarder 300, the second angular PBS module 400, the third angular PBS module 500, and the PBS cube 600, and then exits from the first exit collimator 701 and the second exit collimator 702 respectively.

The incident collimator 100 introduces the optical signal into the adjustable optical splitter 1000, and the first corner PBS module 200 is adjacent to the incident collimator 100 and is used for dividing the optical signal into two branches; the adjustable phase retarder 300 is located at one side of the first rotation angle PBS module 200 and is used for controlling the phase retardation of the optical signal; the second corner PBS module 400 is located at a side of the adjustable phase retarder 300 facing away from the first corner PBS module 200, and is configured to receive one of the light signals emitted from the adjustable phase retarder 300; the third corner PBS module 500 is disposed adjacent to the second corner PBS module 400, and is configured to receive another beam of light signal emitted from the adjustable phase retarder 300, and an S-light signal emitted from the second corner PBS; the PBS cube 600 is disposed adjacent to the third corner PBS module 500, and is configured to combine the optical signal emitted from the second corner PBS module 400 with the optical signal emitted from the third corner PBS module 500; the exit module 700 includes a first exit collimator 701 and a second exit collimator 702 for outputting optical signals from the adjustable optical splitter 1000. By adjusting the adjustable phase retarder 300, optical signal beam splitting with different splitting ratios can be realized, and the adjustable phase retarder 300 can control the phase retardation of the optical signal, so as to realize the adjustment and control of the phase of the optical signal. Through the design, the adjustable optical splitter 1000 can realize better optical signal splitting and beam combination, reduce optical loss and distortion, and utilize the corner PBS and the adjustable optical retarder 300 to realize optical signal splitting and beam combination in the adjustable optical splitter 1000, so that the adjustable optical splitter 1000 has simpler structure and lower cost.

Specifically, the corner PBS (Corner Cube Polarizing Beam SPlitter) is a special type of polarizing beam splitter that combines the functions of a polarizing beam splitter and a corner reflector. Corner PBSs are typically composed of two right angle prisms and a polarizing beam splitter. Both sides of the right angle prism are coated with reflective and transmissive coatings to form an internal reflected light path. The polarization beam splitter is positioned at the junction of the right-angle prism and is used for dividing the incident light into two light beams with different polarization directions. When incident light passes through the corner PBS, it first encounters the polarizing beamsplitter. The polarizing beam splitter splits incident light into two beams according to its polarization direction. One of the beams is reflected into the right-angle prism and is emitted again after multiple reflections. The other beam passes through the polarizing beam splitter and continues to propagate along the original incident direction. In this way, the corner PBS serves to split the incident light into two differently polarized beams and to perform the functions of reflection and splitting in a compact optical element.

Referring to fig. 1, the first corner PBS module 200 includes a first base 201, a first light splitting film 202 and a first corner mirror 203 disposed on the first base 201, and a first half-wave plate 204 corresponding to the first corner mirror 203, wherein the first light splitting film 202 is configured to transmit P light and reflect S light, and the first corner mirror 203 is configured to reflect S light; the light signal incident on the first substrate 201 from the incidence collimator 100 is split by the first splitting film 202, and then the P light is directly transmitted to the adjustable retarder 300, and the s light is reflected by the first corner mirror 203 and then is incident on the first half-wave plate 204, and is converted into the P light to be incident on the adjustable retarder 300.

The optical signal incident on the collimator 100 in the first corner PBS module 200 first enters the first matrix 201 of the first corner PBS module 200. Under the action of the first light-splitting film 202, the P light is directly transmitted to the adjustable retarder 300, and the S light is reflected by the first corner mirror 203, enters the first half-wave plate 204, is converted into the P light, and then enters the adjustable retarder 300. The first light-splitting film 202 functions to split an incident light signal into P light and S light. The P light is directly transmitted, and the S light is reflected, and the first corner mirror 203 is used to reflect the S light to change the transmission direction, and then the reflected S light is converted into the P light by the first half-wave plate 204, so that the P light has the same polarization state as the directly transmitted P light. After passing through the first angular PBS assembly 200, the P-light and the S-light enter the adjustable phase retarder 300, respectively. By adjusting the adjustable phase retarder 300, the phase adjustment of the P-light and the S-light can be achieved, thereby achieving the phase adjustment of the optical signal.

In particular, half-wave plates are typically made of crystalline materials with birefringent properties, the most common materials being orthoquartz or lithium tantalate. These crystalline materials, at a particular thickness, can cause the two polarization components of the incident light to undergo different phase delays, thereby changing the polarization state of the light. When linearly polarized light passes through a half wave plate, it is split into two orthogonal polarization components, called the fast and slow axis components, respectively. These two components experience different phase delays as they propagate inside the crystal, such that their relative phases change.

The P-ray signal reflected by the first corner mirror 203 to the first half-wave plate 204 and the P-ray signal transmitted by the first light splitting film 202 simultaneously pass through the adjustable phase retarder 300.

Referring to fig. 1, an adjustable phase retarder 300 is disposed corresponding to the first angular PBS module 200; the P light emitted from the first half wave plate 204 to the adjustable phase retarder 300 becomes ellipsometric light after passing through the adjustable phase retarder 300, and the P light emitted from the first substrate 201 to the adjustable phase retarder 300 becomes ellipsometric light after passing through the adjustable phase retarder 300.

After the P light emitted from the first half wave plate 204 enters the adjustable phase retarder 300, the P light becomes elliptical polarized light by adjusting the parameters of the adjustable phase retarder 300. Similarly, the P light emitted from the first substrate 201 is changed into elliptical light after passing through the adjustable phase retarder 300. The P-light exiting the first half-wave plate 204 and the first substrate 201 can be phase-adjusted by the adjustable phase retarder 300; adjusting a parameter of adjustable phase retarder 300, such as voltage or mechanical displacement, may change the phase delay of an optical signal as it passes through the retarder. After passing through the adjustable phase retarder 300, the P light changes from linearly polarized light to elliptically polarized light. The polarization control has the beneficial effects that the polarization state of the optical signal can be adjusted to adapt to different optical system requirements, the ellipsometric light can simulate the optical signals with different polarization states in a certain range, and greater flexibility and adaptability are provided. This design enables precise adjustment of the optical signal in terms of time and polarization, providing higher flexibility and possibility of performance optimization for the application of the optical system.

Specifically, the adjustable phase retarder 300 (AdjuStable PhaSe Delayer) is an optical element for controlling the phase retardation of incident light. The phase of light can be changed, so that the phase adjustment and control of light waves are realized. The adjustable phase retarder 300 is typically made of a material having an electro-optic effect, such as a liquid crystal, a piezoelectric material, or an electro-optic crystal. By applying an electric field or voltage, the optical properties of these materials can be changed, thereby changing the phase retardation of the light as it passes through them. In principle, the adjustable phase retarder 300 typically uses an electric field or voltage to adjust the refractive index of a material. By changing the refractive index, the propagation speed and phase retardation of the incident light also change. By adjusting the magnitude of the electric field or voltage, the amount of phase adjustment of the adjustable phase retarder 300 can be precisely controlled.

Referring to fig. 1, the second corner PBS module 400 includes a second substrate 401, a second light splitting film 402 and a second corner mirror 403 disposed on the second substrate 401, and a second half-wave plate 404 corresponding to the second light splitting film 402, wherein the second light splitting film 402 is configured to transmit S light and reflect P light, and the second corner mirror 403 is configured to reflect S light; the optical signal emitted from the adjustable retarder 300 to the second substrate 401 is split by the second splitting film 402, and then the P-light is reflected to the second half-wave plate 404 and converted into S-light, which is then incident to the third corner PBS module 500, and the S-light is reflected by the second corner mirror 403 and then incident to the PBS cube 600.

The second light splitting film 402 is for transmitting S light and reflecting P light, and the second corner mirror 403 is for reflecting S light. After exiting the adjustable retarder 300, the optical signal is split by the second splitting film 402, and the P-light is reflected to the second half-wave plate 404, converted into S-light, and then enters the third corner PBS module 500. The S light is reflected by the second corner mirror 403 and enters the PBS cube 600. The second light splitting film 402 plays a light splitting role in the second corner PBS module 400. The light source transmits S light and reflects P light, so that separation of light signals is realized; by this light splitting function, the optical signal can be split into different polarization components. After the optical signal emitted from the adjustable phase retarder 300 passes through the second light splitting film 402, the P light is reflected to the second half-wave plate 404 and converted into S light; this polarization conversion enables precise adjustment and control of the polarization of the optical signal in the optical system. The second corner mirror 403 is configured to reflect the S light, so that the S light is incident on the PBS cube 600, and by adjusting a position or an angle of the second corner mirror 403, a transmission path of the optical signal can be controlled, so as to implement optical path switching and directional control.

Referring to fig. 1, the third corner PBS module 500 includes a third substrate 501, a third light splitting film 502 and a third corner mirror 503 disposed on the third substrate 501, and a third half-wave plate 504 corresponding to the third corner mirror 503, wherein the third light splitting film 502 is configured to transmit P light, reflect S light, and the third corner mirror 503 is configured to reflect S light; the S light emitted from the second half-wave plate 404 to the third substrate 501 is reflected to the emission module 700 by the third light splitting film 502, the light signal emitted from the adjustable phase retarder 300 to the third substrate 501 is split by the third light splitting film 502, the P light is directly transmitted to the first emission collimator 701, the S light is reflected to the third corner mirror 503, and is reflected to the third half-wave plate 504 by the third corner mirror 503, so that the P light is emitted to the PBS cube 600; the first emission collimator 701 receives the elliptical polarized light formed by the P light emitted from the third substrate 501 and the S light beam.

Specifically, the third light splitting film 502 plays a role of light splitting in the third corner PBS module 500. It transmits P light and reflects S light, thus realizing separation of optical signals. By this light splitting function, the optical signal can be split into different polarization components.

Specifically, the third corner mirror 503 is configured to reflect the S light, so that the S light is incident on the third half-wave plate 504, and the P light is formed to exit to the PBS cube 600. The optical signal is directed into a particular optical element or optical path. By adjusting the position or angle of the third turning mirror 503, the transmission path of the optical signal can be controlled to function as optical path switching and directional control in the adjustable optical splitter 1000.

Specifically, the first emission collimator 701 receives elliptical light formed by P light emitted from the third substrate 501 and S light combined. The light beam is focused or kept propagating parallel to meet specific optical requirements.

Referring to fig. 1, a fourth light splitting film 601 is disposed in the pbs cube 600, wherein the fourth light splitting film 601 is configured to transmit P light and reflect S light; the S light emitted from the second corner mirror 403 to the PBS cube 600 is reflected by the fourth light splitting film 601 and then enters the emission module 700, and the P light emitted from the third half-wave plate 504 to the PBS cube 600 is directly transmitted to the second emission collimator 702 after passing through the fourth light splitting film 601; the second exit collimator 702 receives the elliptical polarized light formed by the P light and the S light beams exiting the PBS cube 600.

The fourth light splitting film 601 plays a role of light splitting in the PBS cube 600. It transmits P light and reflects S light, thus realizing separation of optical signals. This light splitting function allows the P-light and S-light to be handled independently or for different optical applications. The second exit collimator 702 receives the elliptical polarization formed by the P light and the S light combined from the PBS cube 600. This collimation allows the light beam to be focused or to be kept traveling in parallel to meet specific optical requirements.

Specifically, PBS Cube 600 (PBS Cube) is an optical element, also known as a polarizing beam splitting Cube or polarizing beam splitter Cube. It is a cube-shaped polarizing beam splitter capable of splitting incident light into two beams of different polarization directions. PBS cubes 600 are typically composed of two triangular prisms that form a cube structure with special optical coatings and precise assembly. These coatings and configurations enable the PBS cube 600 to perform the functions of splitting and polarization separation of light. As incident light passes through PBS cube 600, it first encounters a triangular prism. The triangular prism has a reflective and transmissive coating that splits the incident light into two beams according to its polarization direction. One of the beams is reflected into the inside of the cube and exits again after multiple reflections. The other beam passes through the second prism and continues to propagate along the original incident direction. In this way, PBS cube 600 enables splitting of incident light into two beams of different polarization directions, and is able to control the direction of light simultaneously. The compact design and efficient polarization beam splitting performance of PBS cube 600 makes it one of the components commonly used in optical systems.

In an alternative embodiment of the invention, the entrance collimator 100, the first exit collimator 701 and the second exit collimator 702 are pigtails with collimating lenses.

Specifically, the pigtail with the collimating lens is commonly used for collimating the light beam in an optical system, so that the light beam can be transmitted in parallel or focused to a specific area, and the collimating lens can correct the divergence or focusing property of the light beam, thereby being beneficial to improving the transmission quality and the directional stability of the light beam. The entrance collimator 100, the first exit collimator 701, and the second exit collimator 702 all perform a collimation function, and can transmit the light beam from the PBS cube 600 to a specific location and keep it propagating or focusing in parallel. This helps to ensure stable transmission and efficient coupling of the optical signals. The pigtail with the collimating lens can improve the performance, stability and adaptability of the optical system, so that the pigtail can better meet the requirements of specific applications.

In an alternative embodiment of the present invention, PBS cube 600 is a coated-based PBS cube glass element.

Specifically, the film-based PBS cube 600 achieves beam splitting by plating a special polarizing beam splitting film on the glass surface. The film coating technology can provide high-efficiency polarization beam splitting effect and has higher optical quality and stability.

In an alternative embodiment of the present invention, the working wavelength of the first half-wave plate 204 corresponds to the wavelength of the outgoing light reflected by the first turning angle mirror 203, the working wavelength of the second half-wave plate 404 corresponds to the wavelength of the outgoing light reflected by the second light splitting film 402, and the working wavelength of the third half-wave plate 504 corresponds to the wavelength of the outgoing light reflected by the third turning angle mirror 503.

The correspondence is to ensure that the light maintains a specific polarization state during transmission and processing in the optical system. By selecting the proper half-wave plate working wavelength, the light can be kept in a consistent polarization state when transmitted between different optical elements, thereby ensuring the normal operation of the system.

It should be noted that the operating wavelength of the half-wave plate is not limited to the wavelength of the outgoing light reflected by the specific element. In practical application, a proper half-wave plate working wavelength can be selected according to the requirement so as to meet the requirement of a specific optical system.

In alternative embodiments of the invention, the adjustable phase retarder 300 is an angularly adjustable rotatable wave plate, or a phase adjustable liquid crystal phase retarder, an electro-optic crystal, an electro-optic ceramic, or the like.

The adjustable phase retarder 300 may be implemented using different techniques. One common method is to use a rotatable wave plate, which is a polarizing element with an adjustable angle, and by rotating the wave plate, the phase difference of the light beam passing through the wave plate can be changed, so as to realize control of the phase delay of the light. Another common type of adjustable phase retarder 300 is the use of liquid crystal phase retarders, electro-optic crystals, or electro-optic ceramics, among others. These materials have electro-optical effect, and the phase of light can be changed by applying an electric field, so that the adjustment of the phase delay of light can be realized, and the precise control of the phase delay of light can be realized.

It should be understood that the foregoing embodiments are merely illustrative of the technical solutions of the present invention, and not limiting thereof, and that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art; all such modifications and substitutions are intended to be included within the scope of this disclosure as defined in the following claims.

Claims (10)

1. A tunable optical splitter, comprising: the system comprises an incident collimator, a first corner PBS module, an adjustable phase retarder, a second corner PBS module, a third corner PBS module, a PBS cube and an emergent module; the first corner PBS module is arranged on one side of the adjustable phase retarder, the second corner PBS module is arranged on one side of the adjustable phase retarder, which is away from the first corner PBS module, the third corner PBS module is arranged adjacent to the second corner PBS module, the PBS cube is arranged adjacent to the third corner PBS module, and the emergent module is arranged corresponding to the third corner PBS module and the PBS cube;

the light signals incident from the incident collimator are respectively emitted from the first emergent collimator and the second emergent collimator after being split and combined under the combined action of the first corner PBS module, the adjustable phase retarder, the second corner PBS module, the third corner PBS module and the PBS cube.

2. The adjustable optical splitter of claim 1, wherein the first corner PBS module comprises a first substrate, a first light splitting film and a first corner mirror disposed on the first substrate, and a first half-wave plate corresponding to the first corner mirror, wherein the first light splitting film is configured to transmit P light and reflect S light, and the first corner mirror is configured to reflect S light; the light signal which is incident to the first matrix from the incidence collimator is split by the first light splitting film, the P light is directly transmitted to the phase retarder, the S light is reflected by the first corner reflector and then is incident to the first half wave plate, and the P light is converted into the P light to be incident to the adjustable phase retarder.

3. The adjustable optical splitter of claim 2, wherein the adjustable phase retarder is disposed corresponding to the first angular of rotation PBS module; the P light emitted from the first half wave plate to the adjustable phase retarder becomes elliptical polarized light after passing through the adjustable phase retarder, and the P light emitted from the first substrate to the adjustable phase retarder becomes elliptical polarized light after passing through the adjustable phase retarder.

4. A tunable optical splitter according to claim 3, wherein the second corner PBS module comprises a second substrate, a second light splitting film and a second corner mirror disposed on the second substrate, and a second half-wave plate corresponding to the second light splitting film, wherein the second light splitting film is configured to transmit S light and reflect P light, and the second corner mirror is configured to reflect S light; and after the light signal emitted from the phase retarder to the second substrate is split by the second light splitting film, the P light is reflected to the second half wave plate and converted into S light to be incident to the third corner PBS module, and the S light is reflected by the second corner reflector and then is incident to the PBS cube.

5. The adjustable optical splitter of claim 4, wherein the third corner PBS module comprises a third substrate, a third light splitting film and a third corner mirror disposed on the third substrate, and a third half-wave plate corresponding to the third corner mirror, wherein the third light splitting film is configured to transmit P light, reflect S light, and reflect S light; s light emitted from the second half-wave plate to the third matrix is reflected to the emission module by the third light splitting film, light signals emitted from the phase retarder to the third matrix are split by the third light splitting film, P light is directly transmitted to the first emission collimator, S light is reflected to the third corner reflector and reflected to the third half-wave plate by the third corner reflector, and P light is emitted to the PBS cube; the first emergent collimator receives elliptical polarized light formed by P light and S light emitted by the third matrix.

6. A tunable optical splitter according to claim 5, wherein a fourth light splitting film is disposed within the PBS cube, wherein the fourth light splitting film is configured to transmit P light and reflect S light; the S light emitted to the PBS cube from the second corner reflector is reflected by the fourth light splitting film and then enters the emitting module, and the P light emitted to the PBS cube from the third half-wave plate is directly transmitted to the second emitting collimator after passing through the fourth light splitting film; and the second emergent collimator receives elliptical polarization formed by P light and S light emergent from the PBS cube.

7. The adjustable optical splitter according to any one of claims 1-6, wherein the entrance collimator, the first exit collimator and the second exit collimator are pigtails with collimating lenses.

8. A tunable optical splitter according to any one of claims 1 to 6, wherein the PBS cube is a coated-based PBS cube glass element.

9. The tunable optical splitter of claim 5 or 6, wherein the first half-wave plate has an operating wavelength corresponding to a wavelength of the outgoing light reflected by the first corner mirror, the second half-wave plate has an operating wavelength corresponding to a wavelength of the outgoing light reflected by the second light splitting film, and the third half-wave plate has an operating wavelength corresponding to a wavelength of the outgoing light reflected by the third corner mirror.

10. A tunable optical splitter according to any one of claims 1-6, wherein the tunable optical retarder is an angularly tunable rotatable waveplate, or a phase tunable liquid crystal phase retarder, an electro-optic crystal, an electro-optic ceramic, or the like.