A lithium niobate four-channel beam splitter
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-10
- Publication Date
- 2026-08-14
AI Technical Summary
传统分束器存在尺寸大、分光均匀性差、带宽窄和工艺容差低的问题，难以满足现代多通道、高速可重构系统的要求
[0015]与现有技术相比，本实用新型的有益效果是：本铌酸锂四通道分束器，铌酸锂芯层设置在铌酸锂衬底上；二氧化硅包层附在铌酸锂芯层上；分束器的工作波长为1550nm。基于铌酸锂制作，尺寸小，结构紧凑且加工简单，制作容差大，产品良率高，可实现工作波段内的均匀分束，在高速光通信、量子技术、微波光子学和未来光学计算等领域具有广阔前景。
Smart Images
Figure CN224636675U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a lithium niobate four-channel beam splitter. Background Technology
[0002] Multimode interferometric beamsplitters (MMIs) utilize the self-image effect generated when light propagates in a multimode waveguide to achieve multiple copies and distribution of the input optical field. Compared with traditional beamsplitters, MMI devices have advantages such as high uniformity, wide bandwidth, compact size, and high process tolerance. These characteristics make MMIs an ideal solution for realizing multi-channel beam splitting, especially suitable for high-channel-count integrated systems.
[0003] With the rapid development of fields such as optical communication, quantum information processing, microwave photonics, and optical computing, the demand for high-performance, miniaturized, and low-power photonic integrated chips is becoming increasingly urgent. As one of the most fundamental passive devices in photonic integrated circuits, the performance of beam splitters directly affects the system's power consumption, bandwidth, integration density, and functional complexity. 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 requirements of modern multi-channel, high-speed, reconfigurable systems.
[0004] Therefore, a lithium niobate four-channel beam splitter is proposed to address the above problems. Utility Model Content
[0005] The purpose of this invention is to overcome the existing defects and provide a lithium niobate four-channel beam splitter that is small in size, compact in structure and simple to process.
[0006] To achieve the above objectives, this utility model provides the following technical solution: 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 disposed on the lithium niobate substrate; the silicon dioxide cladding layer is attached to the lithium niobate core layer;
[0007] The lithium niobate core layer includes an input segment, a multimode interference coupling segment, and an output segment connected sequentially from left to right.
[0008] Preferably, the input segment includes an input straight waveguide segment and an input tapered waveguide segment connected to the input straight waveguide segment; the wide end of the input tapered waveguide segment is connected to the multimode interference coupling segment.
[0009] Preferably, the output segment includes four output tapered waveguide segments and output straight waveguide segments respectively connected to the four output tapered waveguide segments; the wide end of each output tapered waveguide segment is connected to the multimode interference coupling segment.
[0010] Preferably, the width of the multimode interference coupling segment is 50 μm and the length is 705.5 μm.
[0011] Preferably, the length of the input tapered waveguide segment is 15 μm, the width of the large end of the input tapered waveguide segment is 5.4 μm, and the width of the small end is 1.2 μm.
[0012] Preferably, the width of both the input straight waveguide segment and the output straight waveguide segment is 1.2 μm, and the length of both is 10 μm.
[0013] Preferably, the spacing between the four output straight waveguide segments is 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; the output tapered waveguide segment has a length of 15 μm.
[0015] Compared with existing technologies, the advantages of this invention are as follows: This lithium niobate four-channel beam splitter has a lithium niobate core layer disposed on a lithium niobate substrate; a silicon dioxide cladding layer is attached to the lithium niobate core layer; and the beam splitter operates at a wavelength of 1550nm. Based on lithium niobate, it is small in size, compact in structure, simple to process, has a large manufacturing tolerance, and a high product yield. It can achieve uniform beam splitting within the operating wavelength band and has broad prospects in high-speed optical communication, quantum technology, microwave photonics, and future optical computing. Attached Figure Description
[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0017] Figure 1 This is a schematic diagram of the cross-sectional shape of the lithium niobate four-channel beam splitter of this utility model;
[0018] Figure 2 This is a structural diagram of the lithium niobate four-channel beam splitter of this utility model;
[0019] Figure 3 This is a field distribution diagram of light transmission in the lithium niobate four-channel beam splitter of this utility model when light with a wavelength of 1550nm is incident.
[0020] Figure 4 This is a normalized output energy diagram of each output port of the lithium niobate four-channel beam splitter of this utility model with incident wavelength of 1550 nm.
[0021] In the figure: 1. Lithium niobate substrate; 2. Lithium niobate core layer; 3. Silica cladding; 4. Input section; 41. Input straight waveguide section; 42. Input tapered waveguide section; 5. Multimode interference coupling section; 6. Output section; 61. Output tapered waveguide section; 62. Output straight waveguide section. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] like Figure 1-4 As shown, a lithium niobate four-channel beam splitter includes a lithium niobate substrate 1, a lithium niobate core layer 2, and a silicon dioxide cladding layer 3; the lithium niobate core layer 2 is disposed on the lithium niobate substrate 1; the silicon dioxide cladding layer 3 is attached to the lithium niobate core layer 2; the lithium niobate core layer 2 includes an input segment 4, a multimode interference coupling segment 5, and an output segment 6 connected sequentially from left to right.
[0024] Specifically, input segment 4 includes input straight waveguide segment 41 and input tapered waveguide segment 42 connected to input straight waveguide segment 41; the wide end of input tapered waveguide segment 42 is connected to multimode interference coupling segment 5.
[0025] Specifically, the length of the input tapered waveguide segment 42 is 15μm, the width of the large end of the input tapered waveguide segment 42 is 5.4μm, and the width of the small end is 1.2μm.
[0026] Specifically, the width of the input straight waveguide section 41 and the length of the output straight waveguide section 62 are both 1.2 μm and 10 μm respectively.
[0027] Specifically, the output segment 6 includes four output tapered waveguide segments 61 and output straight waveguide segments 62 connected to the four output tapered waveguide segments 61 respectively; the wide end of the output tapered waveguide segment 61 is connected to the multimode interference coupling segment 5.
[0028] Specifically, the spacing between the four output straight waveguide segments 62 is 12.8 μm.
[0029] Specifically, the output tapered waveguide segment 61 has a large end width of 5.4 μm and a small end width of 1.2 μm; the output tapered waveguide segment 61 has a length of 15 μm.
[0030] Specifically, the width of the multimode interference coupling segment 5 is 50 μm, and its length is 705.5 μm. The length of the multimode interference coupling segment has a manufacturing tolerance range of -4% to +4%.
[0031] Specifically, when the beam splitter operates at a center wavelength of 1550 nanometers, within the manufacturing tolerance range, the total output power of the beam splitter is greater than 90%.
[0032] This lithium niobate four-channel beam splitter features a lithium niobate core layer mounted on a lithium niobate substrate, with a silicon dioxide cladding layer attached to the lithium niobate core layer. The beam splitter operates at a wavelength of 1550 nm. Based on lithium niobate, it is small in size, compact in structure, simple to fabricate, has a large manufacturing tolerance, and a high product yield. It can achieve uniform beam splitting within the operating wavelength band and has broad prospects in high-speed optical communication, quantum technology, microwave photonics, and future optical computing.
[0033] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A lithium niobate four-channel beam splitter, characterized in that, It includes a lithium niobate substrate (1), a lithium niobate core layer (2), and a silicon dioxide cladding layer (3); the lithium niobate core layer (2) is disposed on the lithium niobate substrate (1); the silicon dioxide cladding layer (3) is attached to the lithium niobate core layer (2); The lithium niobate core layer (2) includes an input segment (4), a multimode interference coupling segment (5), and an output segment (6) connected sequentially from left to right.
2. The lithium niobate four-channel beam splitter according to claim 1, characterized in that, The input segment (4) includes an input straight waveguide segment (41) and an input tapered waveguide segment (42) connected to the input straight waveguide segment (41); the wide end of the input tapered waveguide segment (42) is connected to the multimode interference coupling segment (5).
3. The lithium niobate four-channel beam splitter according to claim 2, characterized in that, The output segment (6) includes four output tapered waveguide segments (61) and output straight waveguide segments (62) respectively connected to the four output tapered waveguide segments (61); the wide end of the output tapered waveguide segment (61) is connected to the multimode interference coupling segment (5).
4. The lithium niobate four-channel beam splitter according to claim 3, characterized in that, The width of the multimode interference coupling segment (5) is 50 μm and the length is 705.5 μm.
5. The lithium niobate four-channel beam splitter according to claim 2, characterized in that, The length of the input conical waveguide segment (42) is 15 μm, the width of the large end of the input conical waveguide segment (42) is 5.4 μm, and the width of the small end is 1.2 μm.
6. The lithium niobate four-channel beam splitter according to claim 3, characterized in that, The width of the input straight waveguide segment (41) and the length of the output straight waveguide segment (62) are both 1.2 μm and 10 μm respectively.
7. The lithium niobate four-channel beam splitter according to claim 3, characterized in that, The spacing between the four output straight waveguide segments (62) is 12.8 μm.
8. The lithium niobate four-channel beam splitter according to claim 3, characterized in that, The output tapered waveguide segment (61) has a large end width of 5.4 μm and a small end width of 1.2 μm; the output tapered waveguide segment (61) has a length of 15 μm.