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Compact eight-channel wavelength demultiplexer using modified photonic crystal ring resonators for CWDM applications

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Abstract

An eight-channel wavelength demultiplexer by cascading of ring resonators (RRs) in photonic crystal (PhC) structure is proposed in this paper. In designing of this demultiplexer, we used eight square-shaped PhC RRs with different refractive index (RI) of defect rods to generate a distinctive resonance wavelength. Each PhC RR has a specific resonance wavelength with tuning a variety of design parameters such as RI of a whole, defect and inner rods and radius of defect rods. In operating wavelength of λ0 = 1497 nm, the transmission power and quality factor (Q) of single RR are discovered as 96% and 1000, respectively. The average power transmission, channel spacing, crosstalk and full width at half maximum are found by finite difference time domain method to be about 96 ± 1%, 2.25 nm, − 35 dB and 1.5 nm, respectively. Simulation outcomes demonstrate that the designed demultiplexer has a proper operation. The footprint of the designed device is about ~ 115 μm2, which makes this device a promising for future photonic integrated circuits.

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Acknowledgments

This work was funded by University of Zabol Grant No. UOZ-GR-9618-171.

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Correspondence to Mohammad Reza Rakhshani.

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Rakhshani, M.R. Compact eight-channel wavelength demultiplexer using modified photonic crystal ring resonators for CWDM applications. Photon Netw Commun 39, 143–151 (2020). https://doi.org/10.1007/s11107-020-00879-8

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