12.5 GHz spectral linewidth optical DWDM photonic crystal demultiplexer in L Band communication window

Balaji, VR and Sivasubramanian, A and Shaik, EH and Hegde, G and Ali, N and Awaphan, A and Medha, AM and Dhanabalan, SS (2024) 12.5 GHz spectral linewidth optical DWDM photonic crystal demultiplexer in L Band communication window. In: Optical and Quantum Electronics, 56 (7).

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Abstract

We propose a Dense Wavelength Division Multiplexing (DWDM) Demultiplexer for L band (1565�1635 nm) applications. The design comprises a Y-shaped branch, a circular ring cavity (CRC), a bus waveguide, and a drop waveguide. To simplify the fabrication process, a CRC cavity is used instead of a regular large ring resonator in the design. The diameter of the CRC cavity is 820 nm. Coupled mode theory is used to examine the behaviour of the proposed demultiplexer. Proposed design achieves a narrow resonant wavelength of 12.5 GHz with a 0.1 nm spectral linewidth, a high-quality factor of 15,789, and minimal cross-talk of � 85 dB between adjacent channels. The results confirm that there is a transmission peak at one of the output port, with simultaneous drop of transmission power i.e. zero, at other output port. Additionally, the results convey that the reflection is zero at the peak resonant wavelength for all channels. Further, the proposed design offers a fabrication tolerance of ± 1 nm for air hole and CRC radii at which the resonant wavelength and transmission would not be effected. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

Item Type:	Journal Article
Publication:	Optical and Quantum Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Demultiplexing; Dense wavelength division multiplexing; Drops; Optical communication; Optical waveguides, Circular ring; Coupling mode; Coupling mode theory; Demultiplexers; Dense wavelength-division-multiplexing; Dense-wavelength-division-multiplexing; Modes theory; Quality factors; Resonant wavelengths; Ring cavities, Crosstalk
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	14 Aug 2024 12:02
Last Modified:	14 Aug 2024 12:02
URI:	http://eprints.iisc.ac.in/id/eprint/85452

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