Lithium niobate four-channel beam splitter
By designing a lithium niobate four-channel beam splitter and adopting a multimode interference coupling structure, the problems of large size and poor beam splitting uniformity of traditional beam splitters are solved, achieving miniaturization and high-efficiency beam splitting, which is suitable for high-speed optical communication and quantum technology.
Patent Information
- Application Number
- CN202511290634.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-10
- Publication Date
- 2025-11-07
AI Technical Summary
Traditional beam splitters suffer from problems such as large size, poor beam splitting uniformity, narrow bandwidth, and low process tolerance, making it difficult to meet the needs of modern multi-channel, high-speed, reconfigurable systems.
A lithium niobate four-channel beam splitter was designed, comprising a lithium niobate substrate, a lithium niobate core layer, and a silicon dioxide cladding layer. It adopts a multimode interference coupling structure, is compact in size and simple to fabricate, and operates at a wavelength of 1550nm.
It achieves miniaturization and uniform beam splitting, improves process tolerance, and has a high product yield, making it suitable for fields such as high-speed optical communication, quantum technology, microwave photonics, and future optical computing.
Smart Images
Figure CN120908931A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to a lithium niobate four-channel beam splitter. BACKGROUND
[0002] Multi-mode interference beam splitters utilize the self-imaging effect generated when light is transmitted in a multi-mode waveguide to realize the multi-path replication and distribution of input light fields. Compared with traditional beam splitters, MMIs have the advantages of high uniformity, wide bandwidth, compact size, high process tolerance, etc. These characteristics make MMIs an ideal solution for realizing multi-channel beam splitting, especially for high-channel integrated systems.
[0003] With the rapid development of optical communication, quantum information processing, microwave photonics and optical computing, there is an increasing demand for high-performance, miniaturized and low-power photonics integrated chips. As one of the most basic passive devices in photonic integrated circuits, the performance of a beam splitter directly affects the power consumption, bandwidth, integration level and functional complexity of a system. Traditional beam splitters have the problems of large size, poor light splitting uniformity, narrow bandwidth and low process tolerance, and are difficult to meet the requirements of modern multi-channel, high-speed and reconfigurable systems.
[0004] Therefore, a lithium niobate four-channel beam splitter is provided to solve the above problems. SUMMARY
[0005] The lithium niobate four-channel beam splitter provided by the application has the advantages of small size, compact structure and simple processing.
[0006] To achieve the above object, the application provides the following technical scheme: a lithium niobate four-channel beam splitter, comprising a lithium niobate substrate, a lithium niobate core layer and a silicon dioxide cladding layer; the lithium niobate core layer is arranged on the lithium niobate substrate; the silicon dioxide cladding layer is attached to the lithium niobate core layer.
[0007] The lithium niobate core layer comprises an input section, a multi-mode interference coupling section and an output section connected in sequence from left to right.
[0008] Preferably, the input section comprises an input straight waveguide section and an input tapered waveguide section connected to the input straight waveguide section; the wide end of the input tapered waveguide section is connected to the multi-mode interference coupling section.
[0009] Preferably, the output section comprises four output tapered waveguide sections and four output straight waveguide sections connected to the four output tapered waveguide sections respectively; the wide end of the output tapered waveguide section is connected to the multi-mode interference coupling section.
[0010] Preferably, the width of the multi-mode interference coupling section is 50 mu m, and the length is 705.5 mu m.
[0011] Preferably, the input tapered waveguide segment has a length of 15 μm, the large end of the input tapered waveguide segment has a width of 5.4 μm, and the small end has a width of 1.2 μm.
[0012] Preferably, the input straight waveguide segment and the output straight waveguide segment each have a width of 1.2 μm and a length of 10 μm.
[0013] Preferably, the four output straight waveguide segments are spaced apart by 12.8 μm.
[0014] Preferably, the output tapered waveguide segment has a large end width of 5.4 μm and a small end width of 1.2 μm, and a length of 15 μm.
[0015] Compared with the prior art, the lithium niobate four-channel beam splitter has the following beneficial effects: the lithium niobate core layer is arranged on the lithium niobate substrate, the silica cladding layer is attached to the lithium niobate core layer, and the working wavelength of the beam splitter is 1550 nm. The lithium niobate four-channel beam splitter has the advantages of small size, compact structure, simple processing, large manufacturing tolerance, high product yield, uniform beam splitting within the working wavelength range, and wide application prospects in the fields of high-speed optical communication, quantum technology, microwave photonics, and future optical computing. BRIEF DESCRIPTION OF DRAWINGS
[0016] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the principles of the present application, and do not constitute a limitation of the present application. In the drawings:
[0017] Figure 1 Fig. 1 is a schematic view of a chip cross section of the lithium niobate four-channel beam splitter of the present application;
[0018] Figure 2 Fig. 2 is a structural view of the lithium niobate four-channel beam splitter of the present application;
[0019] Figure 3 Fig. 3 is a field distribution diagram of light transmission in the beam splitter when the wavelength of the incident light is 1550 nm;
[0020] Figure 4 Fig. 4 is a normalized output energy diagram of each output port of the lithium niobate four-channel beam splitter of the present application when the wavelength of the incident light is 1550 nm.
[0021] In the drawings: 1, lithium niobate substrate; 2, lithium niobate core layer; 3, silica cladding layer; 4, input segment; 41, input straight waveguide segment; 42, input tapered waveguide segment; 5, multimode interference coupling segment; 6, output segment; 61, output tapered waveguide segment; 62, output straight waveguide segment. DETAILED DESCRIPTION
[0022] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a 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 skilled in the art without creative efforts fall within the scope of the present application.
[0023] As shown in the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a 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 skilled in the art without creative efforts fall within the scope of the present application. Figures 1-4 A lithium niobate four-channel beam splitter includes a lithium niobate substrate 1, a lithium niobate core layer 2 and a silica cladding layer 3. The lithium niobate core layer 2 is arranged on the lithium niobate substrate 1. The silica cladding layer 3 is attached to the lithium niobate core layer 2. The lithium niobate core layer 2 includes, in sequence from left to right, an input section 4, a multimode interference coupling section 5 and an output section 6.
[0024] Specifically, the input section 4 includes an input straight waveguide section 41 and an input tapered waveguide section 42 connected to the input straight waveguide section 41. The wide end of the input tapered waveguide section 42 is connected to the multimode interference coupling section 5.
[0025] Specifically, the input tapered waveguide section 42 has a length of 15 μm. The wide end of the input tapered waveguide section 42 has a width of 5.4 μm, and the narrow end has a width of 1.2 μm.
[0026] Specifically, the input straight waveguide section 41 and the output straight waveguide section 62 each have a width of 1.2 μm and a length of 10 μm.
[0027] Specifically, the output section 6 includes four output tapered waveguide sections 61 and output straight waveguide sections 62 connected to the four output tapered waveguide sections 61, respectively. The wide end of the output tapered waveguide section 61 is connected to the multimode interference coupling section 5.
[0028] Specifically, the four output straight waveguide sections 62 are spaced apart by 12.8 μm.
[0029] Specifically, the wide end of the output tapered waveguide section 61 has a width of 5.4 μm, and the narrow end has a width of 1.2 μm. The output tapered waveguide section 61 has a length of 15 μm.
[0030] Specifically, the multimode interference coupling section 5 has a width of 50 μm and a length of 705.5 μm. The length of the multimode interference coupling section has a manufacturing tolerance range of -4% to +4%.
[0031] Specifically, when the operating wavelength of the beam splitter is a center wavelength of 1550 nm, the total output power of the beam splitter is greater than 90% within the manufacturing tolerance range.
[0032] The lithium niobate four-channel beam splitter has a lithium niobate core layer arranged on a lithium niobate substrate, and a silicon dioxide cladding layer attached to the lithium niobate core layer, and has a working wavelength of 1550 nm. The lithium niobate beam splitter has a small size, a compact structure, simple processing, large manufacturing tolerance, high product yield, and can realize uniform beam splitting in the working wavelength range, and has a wide prospect in the fields of high-speed optical communication, quantum technology, microwave photonics and future optical computing.
[0033] Finally, it should be noted that: the above is only the preferred embodiment of the present application, and is not used to limit the present application, although the present application is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A lithium niobate four-channel beam splitter, characterized by, The lithium niobate substrate (1), the lithium niobate core layer (2) and the silica cladding (3); the lithium niobate core layer (2) is arranged on the lithium niobate substrate (1); the silica cladding (3) is attached to the lithium niobate core layer (2); The lithium niobate core layer (2) comprises an input section (4), a multimode interference coupling section (5) and an output section (6) connected in sequence from left to right.
2. The lithium niobate four-channel beam splitter of claim 1, wherein, The input section (4) comprises an input straight waveguide section (41) and an input tapered waveguide section (42) connected with the input straight waveguide section (41); the wide end of the input tapered waveguide section (42) is connected with the multimode interference coupling section (5).
3. The lithium niobate four-channel beam splitter of claim 2, wherein, The output section (6) comprises four output tapered waveguide sections (61) and output straight waveguide sections (62) connected with the four output tapered waveguide sections (61) respectively; the wide end of the output tapered waveguide section (61) is connected with the multimode interference coupling section (5).
4. The lithium niobate four-channel beam splitter of claim 3, wherein, The width of the multimode interference coupling section (5) is 50μm, and the length is 705.5μm.
5. The lithium niobate four-channel beam splitter of claim 2, wherein, The length of the input tapered waveguide section (42) is 15μm, the width of the large end of the input tapered waveguide section (42) is 5.4μm, and the width of the small end is 1.2μm.
6. The lithium niobate four-channel beam splitter of claim 3, wherein, The width of the input straight waveguide section (41) and the output straight waveguide section (62) is 1.2μm, and the length is 10μm.
7. The lithium niobate four-channel beam splitter of claim 3, wherein, The interval between the four output straight waveguide sections (62) is 12.8μm.
8. The lithium niobate four-channel beam splitter of claim 3, wherein, The width of the large end of the output tapered waveguide section (61) is 5.4μm, and the width of the small end is 1.2μm; the length of the output tapered waveguide section (61) is 15μm.