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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14044
Title: Liquid crystal-based widely tunable integrated optic wavelength filters
Authors: Tripathi U.S.
Rastogi, Vipul K.
Published in: Journal of the Optical Society of America B: Optical Physics
Abstract: We report widely tunable wavelength filters using liquid crystal (LC)-based long-period waveguide gratings (LPWGs). The high birefringence and electrically tunable refractive index of the LC have been used to achieve a tuning range covering most of the S, C, and L bands of an optical communication system. E7 LC has been used as a cover layer in an LPWG rib waveguide structure. The LPWG structure couples light from the fundamental mode to the slab modes of the waveguide. This results in transmission dips at resonance wavelengths. The mode constants of the coupling modes can be changed by controlling the refractive index of the LC and hence the resonance wavelengths by using the externally applied electric field. We have carried out numerical simulations to analyze the performance of E7 LC-based LPWGs on various substrates such as ion-exchanged BK7 glass and proton-exchanged LiNbO3 and silicon-on-insulator and silicon nitride substrates. The potential applications of the device are electrically tunable wavelength filters for optical communication systems. © 2019 Optical Society of America
Citation: Journal of the Optical Society of America B: Optical Physics (2019), 36(7): 1883-1889
URI: https://doi.org/10.1364/JOSAB.36.001883
http://repository.iitr.ac.in/handle/123456789/14044
Issue Date: 2019
Publisher: OSA - The Optical Society
ISSN: 7403224
Author Scopus IDs: 57208401047
7006364661
Author Affiliations: Tripathi, U.S., Instrument Research and Development Establishment, Dehradun, Uttarakhand 248008, India, Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Rastogi, V., Department of Physics, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Corresponding Author: Tripathi, U.S.; Instrument Research and Development EstablishmentIndia; email: ust@irde.drdo.in
Appears in Collections:Journal Publications [PH]

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