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Dual-band filtering-beam splitting integrated device based on photonic crystals for wavelength-division multiplexing systems

Z. M. HUANG1, Z. H. WU1,* , Y. F. CHI1, J. T. LI1, M. ZHONG1, Y. QIU1, B. TANG1

Affiliation

  1. School of Sciences, Southwest Petroleum University, 610500, Chengdu, China

Abstract

As optical communications demand greater bandwidth and efficiency, we propose a compact dual-band photonic-crystal device with a triangular lattice that integrates a ring resonator with point-defect microcavities to perform simultaneous filtering and symmetric 1:1 beam splitting at 1.31 μm and 1.55 μm. FDTD results show total transmittances of 96.4% and 98.6%, filtering efficiencies of 99.63% and 99.12%, insertion loss as low as 0.015 dB, and Q-factors of 689 and 738, demonstrating strong spectral selectivity and negligible loss. This highly integrated, low-loss, high-Q design is promising for compact WDM photonic integrated circuits..

Keywords

Photonic crystals, Optical filters, Beam splitters, Monolithic integration.

Submitted at: Nov. 17, 2025
Accepted at: Aug. 4, 2026

Citation

Z. M. HUANG, Z. H. WU, Y. F. CHI, J. T. LI, M. ZHONG, Y. QIU, B. TANG, Dual-band filtering-beam splitting integrated device based on photonic crystals for wavelength-division multiplexing systems, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 7-8, pp. 299-305 (2026)