CN217543553U - Polarization beam splitter - Google Patents
Polarization beam splitter Download PDFInfo
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- CN217543553U CN217543553U CN202221279026.0U CN202221279026U CN217543553U CN 217543553 U CN217543553 U CN 217543553U CN 202221279026 U CN202221279026 U CN 202221279026U CN 217543553 U CN217543553 U CN 217543553U
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- fiber collimator
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- beam splitter
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- collimator
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Abstract
The utility model discloses a polarization beam splitter, which comprises a packaging shell, a beam splitter, a first input single-fiber collimator, a second input single-fiber collimator, a first output double-fiber collimator, a second output double-fiber collimator, a polarizing plate, a first birefringent crystal and a second birefringent crystal; the first side surface of the light splitting sheet is plated with an antireflection film, the second side surface of the light splitting sheet is plated with a reflecting film and an antireflection film, the polarizing sheet is arranged at the outlet of the first input single-fiber collimator, the first birefringent crystal is arranged at the inlet of the first output double-fiber collimator, and the second birefringent crystal is arranged at the inlet of the second output double-fiber collimator; first input single fiber collimator is located the first side of beam-splitting piece, and second input single fiber collimator is located the second side of beam-splitting piece, and first output double fiber collimator and second output double fiber collimator are located the both sides of beam-splitting piece respectively. The embodiment of the utility model provides a can reduce the optical fiber management degree of difficulty, reduce volume and cost, obtain more stable optical property, but wide application in optical communication technical field.
Description
Technical Field
The utility model relates to an optical communication technical field especially relates to a polarization beam splitter.
Background
Coherent optical communication systems are gaining increasing attention because they have many advantages over other systems, such as increased receiver selectivity. The existing optical device for polarization coherent beam splitting generally connects a polarizer, a coupler and a polarization beam splitter through an optical fiber, and has the following problems: easy to be affected by environment, unstable performance, large volume, high cost, etc.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the embodiments of the present invention is to provide a polarization beam splitter, which can reduce the difficulty of optical fiber management, reduce the volume and cost, and obtain more stable optical performance.
The embodiment of the utility model provides a polarization beam splitter, including the encapsulation casing, and be located inside beam splitter, first input single fiber collimator, second input single fiber collimator, first output double fiber collimator, second output double fiber collimator, polaroid, first birefringent crystal and second birefringent crystal of encapsulation casing; the first side surface of the light splitting sheet is plated with an antireflection film, the second side surface of the light splitting sheet is plated with a reflecting film and an antireflection film, the polarizing sheet is arranged at an outlet of a first input single-fiber collimator, the first birefringent crystal is arranged at an inlet of a first output double-fiber collimator, and the second birefringent crystal is arranged at an inlet of a second output double-fiber collimator; the first input single-fiber collimator is located on a first side of the light splitting sheet, the second input single-fiber collimator is located on a second side of the light splitting sheet, and the first output double-fiber collimator and the second output double-fiber collimator are located on two sides of the light splitting sheet respectively.
Optionally, included angles between the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator and the light splitting sheet are acute angles.
Optionally, the light splitting piece is located at a central position of the package housing.
Optionally, the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator have the same included angle with the beam splitter.
Optionally, the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator all have an angle of 67.5 degrees with the beam splitter.
Optionally, the first birefringent crystal and/or the second birefringent crystal comprise wollaston prisms.
Optionally, the ratio of the reflective film to the antireflection film on the second side surface of the spectroscopic sheet is 50.
Implement the embodiment of the utility model provides a include following beneficial effect: in the embodiment, a first input single-fiber collimator, a second input single-fiber collimator, a first output double-fiber collimator and a second output double-fiber collimator are respectively arranged at two sides of a film beam splitter, signal light enters the beam splitter from the first input single-fiber collimator, reference light enters the beam splitter from the second input single-fiber collimator, the signal light and the reference light are superposed and interfered in the beam splitter and can be output from the first output double-fiber collimator and the second output double-fiber collimator respectively after being split in proportion; the optical fiber is transmitted by adopting a free space optical path, and devices are integrated on the packaging shell, so that the difficulty of optical fiber processing and management is reduced, the size of the optical device is reduced, the cost is effectively reduced, and more stable optical performance is obtained.
Drawings
Fig. 1 is a schematic structural diagram of a polarization beam splitter according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a polarization beam splitter, including a package housing 100, and a beam splitter 106, a first input single-fiber collimator 101, a second input single-fiber collimator 102, a first output dual-fiber collimator 103, a second output dual-fiber collimator 104, a polarizer 105, a first birefringent crystal 107, and a second birefringent crystal 108 located inside the package housing 100; wherein, a first side surface of the beam splitter 106 is plated with an antireflection film and a second side surface thereof is plated with a reflective film and an antireflection film, the polarizer 105 is disposed at an outlet of the first input single-fiber collimator 101, the first birefringent crystal 107 is disposed at an inlet of the first output dual-fiber collimator 103, and the second birefringent crystal 108 is disposed at an inlet of the second output dual-fiber collimator 104; the first input single-fiber collimator 101 is located at a first side of the beam splitter 106, the second input single-fiber collimator 102 is located at a second side of the beam splitter 106, and the first output dual-fiber collimator 103 and the second output dual-fiber collimator 104 are respectively located at two sides of the beam splitter 106.
It should be noted that the ratio of the reflection film and the antireflection film on the second side of the beam splitter is determined according to practical applications, and this embodiment is not particularly limited.
Specifically, signal light is input from a first input single-fiber collimator 101, and linearly polarized light is obtained after polarization by a polarizing plate 105; after the signal light and the reference light simultaneously pass through the film thin film light-splitting sheet 106 in a preset proportion, linearly polarized light of the first input single-fiber collimator and the reference light are mutually superposed and interfere with each other, a part of light is reflected to the first output double-fiber collimator 103, and a part of light is transmitted to the second output double-fiber collimator 104. Because the output double-fiber collimator is provided with the birefringent crystal, the light beam can be divided into two linearly polarized light beams which are separated from each other and have mutually vertical vibration directions. The generated interference light is split into two linearly polarized light beams to be output from the dual-fiber collimator.
Optionally, included angles between the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator and the light splitting sheet are acute angles.
It should be noted that, the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator form a certain angle with the light splitting sheet, so that the space of an optical device can be saved more effectively, the difficulty of optical fiber management can be reduced, and more stable performance can be obtained.
Optionally, the light splitting piece is located at a central position of the package housing.
It should be noted that, the beam splitter is located at the central position of the package housing, so that the first input single-fiber collimator, the second input single-fiber collimator, the first output double-fiber collimator and the second output double-fiber collimator distributed on two sides of the beam splitter can be more conveniently arranged, the single-fiber collimators or the double-fiber collimators distributed on two sides of the beam splitter are more uniform, and difficulty in processing and managing the optical fibers is reduced.
Optionally, the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator have the same included angle with the beam splitter.
It should be noted that the included angles between the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, the second output dual-fiber collimator and the beam splitter are all equal, so that effective transmission of the optical path is facilitated, and ineffective propagation of the optical path is reduced.
Optionally, included angles between the first input single-fiber collimator, the second input single-fiber collimator, the first output dual-fiber collimator, and the second output dual-fiber collimator and the light splitting sheet are all 67.5 degrees.
Specifically, when the beam splitter is in the vertical direction, the first input single-fiber collimator and the first output dual-fiber collimator respectively form an included angle of about 22.5 degrees with the horizontal direction, and the second input single-fiber collimator and the second output dual-fiber collimator beam splitter form an included angle of 22.5 degrees with the horizontal direction.
Optionally, the first birefringent crystal and/or the second birefringent crystal comprise wollaston prisms.
It should be noted that the birefringent crystal is determined by practical applications, including but not limited to wollaston prism, and the embodiment is not limited specifically.
Optionally, the ratio of the reflective film to the antireflection film on the second side surface of the spectroscopic sheet is 50.
Specifically, when the ratio of the reflection film to the antireflection film on the second side surface is 50, it indicates that the light emitted from the first output dual-fiber collimator and the second output dual-fiber collimator are equal to each other. The proportion of the reflecting film and the antireflection film on the second side surface of the light splitting sheet is determined according to the proportion of emergent light from the first output double-fiber collimator and the second output double-fiber collimator.
Implement the embodiment of the utility model provides a include following beneficial effect: in the embodiment, a first input single-fiber collimator, a second input single-fiber collimator, a first output double-fiber collimator and a second output double-fiber collimator are respectively arranged at two sides of a thin film beam splitter, signal light enters the beam splitter from the first input single-fiber collimator, reference light enters the beam splitter from the second input single-fiber collimator, and the signal light and the reference light are superposed and interfered in the beam splitter and can be split in proportion and then are respectively output from the first output double-fiber collimator and the second output double-fiber collimator; the optical fiber is transmitted by adopting a free space optical path, and devices are integrated on the packaging shell, so that the difficulty of optical fiber processing and management is reduced, the size of the optical device is reduced, the cost is effectively reduced, and more stable optical performance is obtained.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (7)
1. A polarization beam splitter is characterized by comprising a packaging shell, a beam splitter, a first input single-fiber collimator, a second input single-fiber collimator, a first output double-fiber collimator, a second output double-fiber collimator, a polarizing film, a first birefringent crystal and a second birefringent crystal, wherein the beam splitter, the first input single-fiber collimator, the second input single-fiber collimator, the first output double-fiber collimator, the second output double-fiber collimator, the polarizing film, the first birefringent crystal and the second birefringent crystal are positioned in the packaging shell; the first side surface of the light splitting sheet is plated with an antireflection film, the second side surface of the light splitting sheet is plated with a reflecting film and an antireflection film, the polarizing sheet is arranged at an outlet of a first input single-fiber collimator, the first birefringent crystal is arranged at an inlet of a first output double-fiber collimator, and the second birefringent crystal is arranged at an inlet of a second output double-fiber collimator; first input single fiber collimator is located the first side of beam-splitting piece, second input single fiber collimator is located the second side of beam-splitting piece, first output double fiber collimator with second output double fiber collimator is located respectively the both sides of beam-splitting piece.
2. The polarization beam splitter of claim 1, wherein the first input single collimator, the second input single collimator, the first output dual collimator, and the second output dual collimator are all at acute angles to the beam splitter.
3. The polarizing beam splitter of claim 1, wherein the beamsplitter is centrally located within the package housing.
4. The polarizing beam splitter of claim 1, wherein the first input single fiber collimator, the second input single fiber collimator, the first output dual fiber collimator, and the second output dual fiber collimator are all disposed at equal angles to the beam splitter.
5. The polarization beam splitter of claim 4, wherein the first input single fiber collimator, the second input single fiber collimator, the first output dual fiber collimator, and the second output dual fiber collimator are all at an angle of 67.5 degrees to the beam splitter.
6. The polarizing beam splitter as claimed in claim 1 wherein the first birefringent crystal and/or the second birefringent crystal comprises a wollaston prism.
7. The polarizing beam splitter of claim 1, wherein the ratio of reflective film to antireflective film on the second side of the beamsplitter is 50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221279026.0U CN217543553U (en) | 2022-05-25 | 2022-05-25 | Polarization beam splitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221279026.0U CN217543553U (en) | 2022-05-25 | 2022-05-25 | Polarization beam splitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217543553U true CN217543553U (en) | 2022-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221279026.0U Active CN217543553U (en) | 2022-05-25 | 2022-05-25 | Polarization beam splitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217543553U (en) |
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2022
- 2022-05-25 CN CN202221279026.0U patent/CN217543553U/en active Active
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