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Zero-birefringence dual mode waveguides and polarization-independent two-mode (de)multiplexer on thin film Lithium niobate

Kaushalram, A and Talabattula, S (2021) Zero-birefringence dual mode waveguides and polarization-independent two-mode (de)multiplexer on thin film Lithium niobate. In: Optics Communications, 500 .

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Official URL: https://doi.org/10.1016/j.optcom.2021.127334


Zero birefringence (ZBR) dual-mode rib waveguides supporting two quasi TE modes (TE00, TE10) and two quasi TM modes (TM00, TM10) are designed on thin film X-cut lithium niobate. Anisotropy of lithium niobate is utilized to achieve a birefringence of �2 � 10�5 for both fundamental mode pair and the first order mode pair simultaneously, using full-vectorial finite difference Eigen mode solver. Coherence length of 1.4 mm is achieved with practically acceptable tolerances to fabrication errors. ZBR waveguides have been used to design polarization-independent two-mode (de) multiplexer with mode conversion efficiency greater than 96 and a crosstalk of about �14 dB for both TE and TM polarizations. Proposed device is tolerant to fabrication errors and exhibits a broad bandwidth of 165 nm. Polarization-independent components reduce system complexity in mode/polarization division hybrid multiplexing schemes and are also useful in multi-analyte sensing. © 2021 Elsevier B.V.

Item Type: Journal Article
Publication: Optics Communications
Publisher: Elsevier B.V.
Additional Information: The copyright for this article belongs to Elsevier B.V.
Keywords: Birefringence; Directional couplers; Lithium; Multiplexing equipment; Niobium compounds; Polarization, Asymmetric directional coupler; Fabrication errors; Lithium niobate; Mode division multiplexer; Multi-mode waveguides; Multimode waveguide; Polarization independent; Thin film lithium niobate; Thin-films; Zero birefringence, Thin films
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 24 Sep 2021 07:55
Last Modified: 24 Sep 2021 07:55
URI: http://eprints.iisc.ac.in/id/eprint/69719

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