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Broadband transverse magnetic pass polarizer with low insertion loss based on silicon nitride waveguide

Sharma, Tarun Kumar and Ranganath, Praveen and Nambiar, Siddharth and Selvaraja, Shankar Kumar (2018) Broadband transverse magnetic pass polarizer with low insertion loss based on silicon nitride waveguide. In: OPTICAL ENGINEERING, 57 (3).

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Official URL: http://dx.doi.org/10.1117/1.OE.57.3.037104

Abstract

A horizontally asymmetric transverse magnetic (TM) pass polarizer is presented. The device passes only TM mode and rejects transverse electric (TE) mode. The proposed device has an asymmetricity in the horizontal direction comprising a direction coupler region with a silicon waveguide, silicon nitride waveguide, and an air gap, all residing on silica. Between three equal width Si waveguides, we have one region filled with air and the other with SiN with unequal optimized widths. The device with its optimal dimensions yields an extremely low insertion loss (IL) of 0.16 dB for TM -> TM, while TE is rejected by an IL of >48 dB. The proposed polarizer is operated between C&L bands with a high extinction ratio and broadband width of about 110 nm. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)

Item Type: Journal Article
Additional Information: Copy right for this article belong to SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 07 May 2018 19:01
Last Modified: 07 May 2018 19:01
URI: http://eprints.iisc.ac.in/id/eprint/59770

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