Ultra-broadband fabrication-tolerant mode division (de)multiplexer on thin film Lithium niobate

被引：9
作者：
Kaushalram, Archana [1 ]
Yadunath, T. R. [1 ,2 ]
Das, Partha P. [2 ]
Hegde, Gopalkrishna [3 ]
Talabattula, Srinivas [1 ]
机构：
[1] Indian Inst Sci, Dept Elect Commun Engn, Bengaluru 560012, India
[2] Natl Inst Technol, Dept Phys, Mangalore, Karnataka, India
[3] Indian Inst Sci, Ctr BioSyst Sci & Engn, Bengaluru 560012, India
来源：
OPTICS COMMUNICATIONS | 2020年 / 475卷
关键词：
Mode division multiplexer; Thin film Lithium niobate; Crosstalk; Bandwidth; Asymmetric directional coupler; WAVE-GUIDE; DIRECTIONAL COUPLER; COMPACT; MULTIPLEXER; POWER;
D O I：
10.1016/j.optcom.2020.126251
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Mode division (de) multiplexers based on asymmetric directional coupler are designed and analysed on the emerging thin film lithium niobate platform in rib, buried and strip waveguide configurations. Rib configuration offers a large bandwidth of similar to 215 nm with a crosstalk level lower than -10 dB, and provides a large fabrication tolerance of +/- 50 nm. Strip configuration exhibits a better crosstalk of -19.7 dB at the design wavelength of 1550 nm, and has a reasonable fabrication tolerance of +/- 30 nm. Performance of (de) multiplexers on all three waveguide configurations are analysed in terms of modal crosstalk, mode conversion efficiency, bandwidth, along with fabrication tolerance to width and sidewall angle. The influence of electro-optic effect on the coupling length of lithium niobate mode multiplexers is also investigated.
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页数：8
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