An adjustable optical power splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing

Abstract

The present application discloses an adjustable optical splitting ratio splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing, including a bottom plate. A collimator is provided on the bottom plate, and a plurality of polarization beam splitters and wavelength division multiplexing chips are provided on the bottom plate. The plurality of polarization beam splitters are coupled to each other and form a beam splitting optical path with the wavelength division multiplexing chip. In the embodiment of the present application, by using the above adjustable optical splitting ratio splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing, multiple linearly polarized lights with different wavelengths are combined into one beam by the wavelength division multiplexing chip to achieve wavelength division multiplexing, and the multiplexed linearly polarized light is divided into multiple beams according to the wavelength by the wavelength division multiplexing chip to achieve wavelength division demultiplexing, realizing the integration and miniaturization of the splitter, wavelength division multiplexer, and wavelength division demultiplexer. By adjusting the splitting ratio of the polarization beam splitter at the corresponding position through the rotatable 1 / 2 wave plate provided on the beam splitting optical path, the splitter can achieve beam splitting with multiple splitting ratios, and has stronger practicability and applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber splitters, and particularly to an adjustable optical splitting ratio splitter that realizes polarization-maintaining wavelength division multiplexing and demultiplexing. Background Art

[0002] An optical splitter, also known as an optical branching device, is an optical fiber connection device with multiple input ends and multiple output ends, and is commonly used for optical signal coupling, branching, and distribution.

[0003] Wavelength division multiplexing combines multiple light beams with different wavelengths into one beam, and wavelength division demultiplexing separates multiplexed optical signals by wavelength.

[0004] Most of the existing polarization-maintaining optical splitters do not have the functions of wavelength division multiplexing and wavelength division demultiplexing, and all have a fixed optical splitting ratio, unable to flexibly adapt to various optical splitting requirements. Moreover, they all adopt the method of fused biconical taper. In the case of multiple paths, the optical fibers need to be fused and connected in series to achieve the effects of 1 to 2, 2 to 4, and 4 to 8. The polarization-maintaining wavelength division multiplexing / demultiplexing is the same as the fused biconical taper method. In such a series connection, both the loss and the extinction ratio will have a large attenuation. Moreover, after the optical splitter is connected in series, there are optical fibers and fusion joints, which need to be encapsulated in a box, resulting in a relatively large volume. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an adjustable optical splitting ratio splitter that realizes polarization-maintaining wavelength division multiplexing and demultiplexing, which has a small structure, can adjust the optical splitting ratio, and integrates the functions of wavelength division multiplexing and wavelength division demultiplexing.

[0006] To achieve the above object, the present invention is realized through the following technical solutions.

[0007] The present application provides an adjustable optical splitting ratio splitter that realizes polarization-maintaining wavelength division multiplexing and demultiplexing, including a bottom plate;

[0008] At least four collimators are provided on the bottom plate;

[0009] A plurality of polarization beam splitters are provided on the bottom plate and are coupled to each other, and are used for splitting the incident linearly polarized light into two perpendicular polarized lights or purifying the incident linearly polarized light;

[0010] A plurality of wavelength division multiplexing chips are provided on the bottom plate, and are used for combining multiple incident linearly polarized lights with different wavelengths into one beam, or dividing the incident multiplexed linearly polarized light into multiple beams according to wavelength, or reflecting or transmitting a single linearly polarized light according to wavelength correspondingly;

[0011] Among them, at least two of the collimators serve as input ends, and at least two collimators serve as output ends. The polarization beam splitter receives the incident light input from the input end of the collimator and forms a beam splitting optical path with the wavelength division multiplexing film, and the optical axis of the output end of the collimator is coaxial with the outgoing light of the beam splitting optical path.

[0012] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, further comprising:

[0013] A half-wave plate, at least one of which is rotatably provided on the bottom plate;

[0014] Among them, the half-wave plate is located on the beam splitting optical path at the incident light position of the corresponding polarization beam splitter and is used to adjust the beam splitting ratio of the corresponding polarization beam splitter.

[0015] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, wherein the beam splitting ratio range of the half-wave plate for adjusting the corresponding polarization beam splitter is greater than 0% and less than 100%.

[0016] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, further comprising:

[0017] A wave plate adjusting ring, which is arranged on the bottom plate and connected to the half-wave plate;

[0018] A polarization adjustment rod, which is connected to the wave plate adjusting ring and coupled with the half-wave plate, and is used to adjust the angle of the half-wave plate.

[0019] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, wherein one of the wavelength division multiplexing films is located at the intersection position of the optical axes of the input ends of two of the collimators.

[0020] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, wherein one of the wavelength division multiplexing films is located at the intersection position of the optical axes of the output ends of two of the collimators.

[0021] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, wherein a polarization beam splitter for purifying the linearly polarized light incident on itself is provided between the corresponding collimator and the wavelength division multiplexing film.

[0022] Further defined, the above adjustable beam splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, further comprising:

[0023] A glass tube, which is arranged between the collimator and the bottom plate;

[0024] The outer sealing tube is arranged at the corresponding position of the collimator on the bottom plate and is used to seal and protect the collimator at the corresponding position.

[0025] The present invention has at least the following beneficial effects:

[0026] 1. A beam splitting optical path is formed by the polarization beam splitter and the wavelength division multiplexing chip on the bottom plate. The wavelength division multiplexing chip can combine multiple linearly polarized light beams with different wavelengths incident on itself into one beam to achieve wavelength division multiplexing, and can also divide the multiplexed linearly polarized light incident on itself into multiple beams according to wavelengths to achieve wavelength division demultiplexing.

[0027] 2. The integration and miniaturization of the splitter, wavelength division multiplexer, and wavelength division demultiplexer are realized, and more usage scenarios can be satisfied.

[0028] 3. By arranging a rotatable half-wave plate on the beam splitting optical path, that is, by changing the polarization direction angle of the light incident on itself through the half-wave plate, the beam splitting ratio of the polarization beam splitter at the corresponding position is adjusted, so that the splitter can achieve beam splitting with multiple beam splitting ratios, and the practicability and applicability are stronger. Description of the Drawings

[0029] Figure 1 It is a specific structural schematic diagram of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application;

[0030] Figure 2 It is a sectional structural schematic diagram of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application;

[0031] Figure 3 It is an enlarged structural schematic diagram of the "PBS fixed tube 500" part of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application;

[0032] Figure 4 It is an enlarged structural schematic diagram of the "glass tube 910" part of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application;

[0033] Figure 5 It is a beam splitting optical path schematic diagram of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application when only polarized light is input by the "first collimator 210";

[0034] Figure 6 It is a beam splitting optical path schematic diagram of the adjustable beam splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing in the embodiment of the present application when only polarized light is input by the "seventh collimator 270";

[0035] Figure 7This is a schematic diagram of the optical splitting path when the polarization-maintaining wavelength division multiplexing and demultiplexing tunable optical splitting ratio splitter according to the embodiments of the present application inputs polarized light from the "first collimator 210" and the "first collimator 210".

[0036] Reference numerals

[0037] 100 - bottom plate, 210 - first collimator, 220 - second collimator, 230 - third collimator, 240 - fourth collimator, 250 - fifth collimator, 260 - sixth collimator, 270 - seventh collimator, 310 - first polarization beam splitter, 320 - second polarization beam splitter, 330 - third polarization beam splitter, 340 - fourth polarization beam splitter, 350 - fifth polarization beam splitter, 360 - sixth polarization beam splitter, 370 - seventh polarization beam splitter, 410 - first wavelength division multiplexing chip, 420 - second wavelength division multiplexing chip, 500 - PBS fixed tube, 600 - sealing cover, 700 - plug, 810 - wave plate adjustment ring, 820 - 1 / 2 wave plate, 830 - polarization adjustment rod, 910 - glass tube, 920 - outer sealing tube. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present application will be clearly described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0039] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0040] Next, with reference to the accompanying drawings, the tunable optical splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0041] As Figure 1 - Figure 2As shown in the figure, an embodiment of the present application provides an adjustable optical splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing, including a bottom plate 100. On the bottom plate 100, a first collimator 210, a second collimator 220, a third collimator 230, a fourth collimator 240, and a fifth collimator 250 are fixedly arranged in an array. Among them, the first collimator 210 is used for input of polarized light, and the second collimator 220, the third collimator 230, the fourth collimator 240, and the fifth collimator 250 are used for output of polarized light. A first polarization beam splitter 310, a second polarization beam splitter 320, a third polarization beam splitter 330, a fourth polarization beam splitter 340, and a fifth polarization beam splitter 350 are also fixedly arranged on the bottom plate 100. Among them, the first polarization beam splitter 310 is located on the optical axis of the first collimator 210 and is used for purifying and filtering the polarized light emitted by the first collimator 210. The fifth polarization beam splitter 350 is located on the optical axis of the fifth collimator 250 and is used for purifying and filtering the polarized light incident on the fifth collimator 250.

[0042] A first wavelength division multiplexing chip 410 located on the side of the first polarization beam splitter 310 away from the first collimator 210 and a second wavelength division multiplexing chip 420 located on the side of the fifth polarization beam splitter 350 away from the fifth collimator 250 are fixedly arranged on the bottom plate 100. The first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 can reflect polarized light of a specific wavelength incident on themselves. For example, Figure 5 As shown in the figure, polarized light with a wavelength of 1310 nm is emitted by the first collimator 210. The polarized light emitted by the first collimator 210 has an incident angle of 45° with the first wavelength division multiplexing chip 410 after passing through the first polarization beam splitter 310. The polarized light emitted to the second wavelength division multiplexing chip 420 has a reflection angle of 45° with the second wavelength division multiplexing chip 420. The first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 are on the same horizontal line and are symmetric about the perpendicular line of this horizontal line. The reflected light of the first wavelength division multiplexing chip 410 can be emitted to the second wavelength division multiplexing chip 420 and, after being reflected by 45° by the second wavelength division multiplexing chip 420, is transmitted through the fifth polarization beam splitter 350 to the fifth collimator 250.

[0043] The second polarization beam splitter 320 is located on the optical axis of the second collimator 220, the third polarization beam splitter 330 is located on the optical axis of the third collimator 230, and the fourth polarization beam splitter 340 is located on the optical axis of the fourth collimator 240. The second polarization beam splitter 320, the third polarization beam splitter 330, the fourth polarization beam splitter 340 are collinear with the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420. That is, the reflected light of the first wavelength division multiplexing chip 410 generates two mutually perpendicular polarized lights after passing through the second polarization beam splitter 320. One of the polarized lights is horizontally incident on the third polarization beam splitter 330, and the other polarized light is vertically incident on the second collimator 220. The horizontally emitted light of the second polarization beam splitter 320 generates two mutually perpendicular polarized lights after passing through the third polarization beam splitter 330. One of the polarized lights is horizontally incident on the fourth polarization beam splitter 340, and the other polarized light is vertically incident on the third collimator 230. The horizontally emitted light of the third polarization beam splitter 330 generates two mutually perpendicular polarized lights after passing through the fourth polarization beam splitter 340. One of the polarized lights is horizontally incident on the second wavelength division multiplexing chip 420, and the other polarized light is vertically incident on the fourth collimator 240. At this time, the lights output by the second collimator 220, the third collimator 230, the fourth collimator 240, and the fifth collimator 250 are all polarized lights with a wavelength of 1310 nm.

[0044] In the embodiment of the present application, the above-mentioned adjustable splitting ratio optical splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing is adopted. Through the splitting properties of the second polarization beam splitter 320, the third polarization beam splitter 330, and the fourth polarization beam splitter 340, and the reflection properties of the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 for polarized lights of specific wavelengths, a one-to-four splitting optical path incident from the first collimator 210 is formed. At the same time, the first polarization beam splitter 310 and the second polarization beam splitter 320 filter the polarized lights incident on themselves, improving the overall extinction ratio of the optical splitter.

[0045] In a preferred embodiment, a sixth collimator 260 and a seventh collimator 270 are fixedly arranged on the bottom plate 100. The sixth collimator 260 and the seventh collimator 270 are symmetrically arranged on both sides of the bottom plate 100 and their optical axes are collinear with the first wavelength division multiplexing flat plate and the second wavelength division multiplexing chip 420. A sixth polarization beam splitter 360 and a seventh polarization beam splitter 370 are also fixedly arranged on the bottom plate 100 through a PBS fixing tube 500. The sixth polarization beam splitter 360 is located on the optical path between the sixth collimator 260 and the second wavelength division multiplexing chip 420, and the seventh polarization beam splitter 370 is located on the optical path between the seventh collimator 270 and the first wavelength division multiplexing chip 410.

[0046] The first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 can transmit polarized lights of specific wavelengths incident on themselves, such as Figure 6As shown, polarized light with a wavelength of 1550 nm is emitted through the seventh collimator 270. The polarized light emitted by the seventh collimator 270 is transmitted to the first wavelength division multiplexing chip 410 after being purified by the seventh polarization beam splitter 370. The transmitted light of the first wavelength division multiplexing chip 410 generates two mutually perpendicular polarized lights after passing through the second polarization beam splitter 320. One of the polarized lights is horizontally incident on the third polarization beam splitter 330, and the other polarized light is vertically incident on the second collimator 220. That is, the horizontally emitted light of the second polarization beam splitter 320 generates two mutually perpendicular polarized lights after passing through the third polarization beam splitter 330. One of the polarized lights is horizontally incident on the fourth polarization beam splitter 340, and the other polarized light is vertically incident on the third collimator 230. The horizontally emitted light of the third polarization beam splitter 330 generates two mutually perpendicular polarized lights after passing through the fourth polarization beam splitter 340. One of the polarized lights is horizontally incident on the second wavelength division multiplexing chip 420, and the other polarized light is vertically incident on the fourth collimator 240. The transmitted light of the second wavelength division multiplexing chip 420 is transmitted to the sixth collimator 260 after being purified by the sixth polarization beam splitter 360. At this time, the lights output by the second collimator 220, the third collimator 230, the fourth collimator 240, and the sixth collimator 260 are all polarized lights with a wavelength of 1550 nm.

[0047] In the embodiment of the present application, the above adjustable optical splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing is adopted. Through the splitting properties of the second polarization beam splitter 320, the third polarization beam splitter 330, and the fourth polarization beam splitter 340, and the transmission properties of the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 for polarized light of a specific wavelength, a one-to-four optical splitting path incident from the seventh collimator 270 is formed. At the same time, the polarized light incident on itself is filtered by the sixth polarization beam splitter 360 and the seventh polarization beam splitter 370 to improve the overall extinction ratio of the optical splitter.

[0048] In a preferred embodiment, as Figure 7As shown in the figure, polarized light with a wavelength of 1310 nm is emitted through the first collimator 210, and at the same time, polarized light with a wavelength of 1550 nm is emitted through the seventh collimator 270. The polarized light emitted by the first collimator 210 is transmitted to the first wavelength division multiplexing chip 410 after being purified by the first polarization beam splitter 310. The polarized light emitted by the seventh collimator 270 is transmitted to the first wavelength division multiplexing chip 410 after being purified by the seventh polarization beam splitter 370. The first wavelength division multiplexing chip 410 multiplexes the two polarized lights with different wavelengths and emits them to the second polarization beam splitter 320. The multiplexed polarized light generates two mutually perpendicular polarized lights after passing through the second polarization beam splitter 320. One of the polarized lights is horizontally incident on the third polarization beam splitter 330, and the other polarized light is vertically incident on the second collimator 220. That is, the horizontally emitted light of the second polarization beam splitter 320 generates two mutually perpendicular polarized lights after passing through the third polarization beam splitter 330. One of the polarized lights is horizontally incident on the fourth polarization beam splitter 340, and the other polarized light is vertically incident on the third collimator 230. The horizontally emitted light of the third polarization beam splitter 330 generates two mutually perpendicular polarized lights after passing through the fourth polarization beam splitter 340. One of the polarized lights is horizontally incident on the second wavelength division multiplexing chip 420, and the other polarized light is vertically incident on the fourth collimator 240. The second wavelength division multiplexing chip 420 demultiplexes the received polarized light into two polarized lights with different wavelengths. Among them, the polarized light with a wavelength of 1310 nm is reflected, and the polarized light with a wavelength of 1550 nm is transmitted. The reflected light of the second wavelength division multiplexing chip 420 is transmitted to the fifth collimator 250 after being purified by the fifth polarization beam splitter 350. The transmitted light of the second wavelength division multiplexing chip 420 is transmitted to the sixth collimator 260 after being purified by the sixth polarization beam splitter 360. At this time, the second collimator 220, the third collimator 230, and the fourth collimator 240 output multiplexed polarized light of a wavelength of 1550 nm and a wavelength of 1310 nm, the fifth collimator 250 outputs polarized light with a wavelength of 1310 nm, and the sixth collimator 260 outputs polarized light with a wavelength of 1550 nm.

[0049] In the embodiment of the present application, the above-mentioned adjustable optical splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing is adopted. When two polarized lights with different wavelengths are simultaneously input by the first collimator 210 and the seventh collimator 270, wavelength division multiplexing can be realized through the first wavelength division multiplexing chip 410 and wavelength division demultiplexing can be realized through the second wavelength division multiplexing chip 420, so as to output polarized lights with different wavelengths while realizing two-to-five optical splitting. According to the same principle, the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 can be replaced with optical splitting chips with different optical splitting ratios, and in this way, the output of the same wavelength combination can also be realized, forming a two-to-four optical splitting effect.

[0050] It can be understood that the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 are not specified to transmit or reflect polarized light with wavelengths of 1310 nm and 1310 nm, perform polarization-maintaining wavelength division multiplexing and demultiplexing. According to the usage requirements, the specifications of the first wavelength division multiplexing chip 410 and the second wavelength division multiplexing chip 420 can be adjusted to achieve the transmission or reflection of polarized light in each band, polarization-maintaining wavelength division multiplexing and demultiplexing.

[0051] In a preferred embodiment, five sealing covers 600 are respectively fixedly provided on the bottom plate 100 at positions corresponding to the first collimator 210, the second collimator 220, the third collimator 230, the fourth collimator 240, and the fifth collimator 250 by screws. The sealing cover 600 at the position corresponding to the first collimator 210 covers the first polarization beam splitter 310 and the first wavelength division multiplexing chip 410. The sealing cover 600 at the position corresponding to the second collimator 220 covers the second polarization beam splitter 320. The sealing cover 600 at the position corresponding to the third collimator 230 covers the third polarization beam splitter 330. The sealing cover 600 at the position corresponding to the fourth collimator 240 covers the fourth polarization beam splitter 340. The sealing cover 600 at the position corresponding to the fifth collimator 250 covers the fifth polarization beam splitter 350 and the second wavelength division multiplexing chip 420. Openings are provided on the sealing cover 600 at the path of the beam splitting optical path, so it will not block the beam splitting optical path. A plug 700 for covering the optical path between the sixth collimator 260 and the sealing cover 600 at the position corresponding to the fifth collimator 250 is provided, and similarly, a plug 700 for covering the optical path between the seventh collimator 270 and the sealing cover 600 at the position corresponding to the first collimator 210 is also provided.

[0052] Four wave plate adjusting rings 810 are fixedly provided on the bottom plate 100 between adjacent two sealing covers 600 by bolts. The wave plate adjusting rings 810 will not block the beam splitting optical path and are in close contact with the corresponding sealing covers 600 to prevent the leakage of the beam splitting optical path. The wave plate adjusting rings 810 have a rotation output end and a rotation input end. A 1 / 2 wave plate 820 is connected to the rotation output end of the wave plate adjusting ring 810, and a polarization adjusting rod 830 is connected to the rotation input end of the wave plate adjusting ring 810. When the wave plate adjusting ring 810 is fastened to the bottom plate 100 by bolts, its rotation input end and rotation output end cannot rotate. When the wave plate adjusting ring 810 is not fastened to the bottom plate 100 by bolts or the fastening force is not strong, the 1 / 2 wave plate 820 can be driven to rotate by rotating the polarization adjusting rod 830.

[0053] The half-wave plate 820 is located on the path of the beam splitting optical path and can change the polarization direction angle of the transmitted polarized light by itself. That is, the half-wave plate 820 between the two sealing covers 600 at the corresponding positions of the first collimator 210 and the second collimator 220 can receive the transmitted and reflected light of the first wavelength division multiplexing chip 410, change its polarization direction angle, and then emit it to the second polarization beam splitter 320. Similarly, the half-wave plate 820 between the two sealing covers 600 at the corresponding positions of the second collimator 220 and the third collimator 230 can receive the transmitted light of the second polarization beam splitter 320, change its polarization direction angle, and then emit it to the third polarization beam splitter 330. The half-wave plate 820 between the two sealing covers 600 at the corresponding positions of the third collimator 230 and the fourth collimator 240 can receive the transmitted light of the third polarization beam splitter 330, change its polarization direction angle, and then emit it to the fourth polarization beam splitter 340. The half-wave plate 820 between the two sealing covers 600 at the corresponding positions of the fourth collimator 240 and the fifth collimator 250 can receive the transmitted light of the fourth polarization beam splitter 340, change its polarization direction angle, and then emit it to the second wavelength division multiplexing chip 420.

[0054] In the embodiment of the present application, the above adjustable optical splitting ratio splitter for polarization-maintaining wavelength division multiplexing and demultiplexing is adopted. When polarized light passes through the half-wave plate 820, the polarization direction angle of the incident polarized light by itself will be changed, so as to realize the adjustment of the optical splitting ratio. For example, when the half-wave plate 820 between the two sealing covers 600 at the corresponding positions of the first collimator 210 and the second collimator 220 rotates the polarization direction angle of the incident horizontal polarized light by 45° to form a 45° angle with the optical axis of the second polarization beam splitter 320, the second polarization beam splitter 320 will split the incident polarized light into two polarized lights that are perpendicular to each other and have an optical intensity of 50% each. Since the angle of the half-wave plate 820 is adjustable, the polarization direction angle of the incident polarized light by itself can be adjusted, thereby affecting the optical splitting ratio of the polarization beam splitter at the corresponding position. The range of the optical splitting ratio of the polarization beam splitter at the corresponding position is greater than 0% and less than 100%. By adjusting the four half-wave plates 820 respectively, polarized light outputs with different optical splitting ratios can be obtained.

[0055] In a preferred embodiment, the first collimator 210, the second collimator 220, the third collimator 230, the fourth collimator 240, the fifth collimator 250, the sixth collimator 260, and the seventh collimator 270 are respectively fixedly arranged in the glass tube 910 by glue. The glass tube 910 at the corresponding positions of the first collimator 210, the second collimator 220, the third collimator 230, the fourth collimator 240, and the fifth collimator 250 is fixedly arranged on the bottom plate 100 by glue. The glass tube 910 at the corresponding positions of the sixth collimator 260 and the seventh collimator 270 is fixedly arranged in the PBS fixing tube 500 by glue. An outer sealing tube 920 for protecting the collimator and the optical fiber at the corresponding positions is sleeved outside the glass tube 910. Among them, the PBS fixing tube 500 is fixedly arranged inside the outer sealing tube 920 at the corresponding positions.

[0056] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0057] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. An adjustable optical power splitting ratio splitter for realizing polarization-maintaining wavelength division multiplexing and demultiplexing, characterized in that, Including: Base plate; Collimators, with at least four provided on the base plate; Polarizing beam splitters, with multiple ones provided on the base plate and coupled to each other, for splitting the incident linearly polarized light into two perpendicular polarized lights or purifying the incident linearly polarized light; Wavelength division multiplexing chips, with multiple ones provided on the base plate, for combining multiple incident linearly polarized lights with different wavelengths into one beam, or dividing the incident multiplexed linearly polarized light into multiple beams according to wavelengths, or reflecting or transmitting a single linearly polarized light according to wavelengths correspondingly; Among them, at least two of the collimators serve as input ends, the optical axes of at least two input ends of the collimators are perpendicular, at least two collimators serve as output ends, and the optical axes of at least two output ends of the collimators are perpendicular; The polarizing beam splitter receives the incident light input from the input end of the collimator and forms a beam splitting optical path with the wavelength division multiplexing chip, and the optical axis of the output end of the collimator is coaxial with the outgoing light of the beam splitting optical path; One of the wavelength division multiplexing chips is located at the intersection position of the optical axes of two input ends of the collimators; One of the wavelength division multiplexing chips is located at the intersection position of the optical axes of two output ends of the collimators; A polarizing beam splitter for purifying the incident linearly polarized light is provided between the collimator and the wavelength division multiplexing chip at the corresponding position; It further includes a half-wave plate, with at least one rotatably provided on the base plate; the half-wave plate is located on the beam splitting optical path at the incident light position of the polarizing beam splitter at the corresponding position and is used to adjust the beam splitting ratio of the polarizing beam splitter at the corresponding position.

2. The tunable optical power splitting ratio optical splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing according to claim 1, wherein The range of the beam splitting ratio of the polarizing beam splitter adjusted by the half-wave plate is greater than 0% and less than 100%.

3. The tunable optical power splitting ratio optical splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing according to claim 1, wherein It further includes: Wave plate adjusting ring, provided on the base plate and connected to the half-wave plate; Polarization adjusting rod, connected to the wave plate adjusting ring and coupled to the half-wave plate, for adjusting the angle of the half-wave plate.

4. The tunable optical power splitting ratio optical splitter for implementing polarization-maintaining wavelength division multiplexing and demultiplexing according to claim 1, wherein It further includes: Glass tube, provided between the collimator and the base plate; Outer sealing tube, provided on the base plate at the corresponding position of the collimator, for sealing and protecting the collimator at the corresponding position.

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