Broadband Photonic Crystal Passive Filters For英文电子书.pdf

OThOl.pdf Broadband Photonic Crystal Passive Filters for Monolithically Integrated InP Photonic Integrated Circuits Marcelo Davan,o, Aimin Xing, Evelyn L. Hu, and Daniel J. Blumenthal Dept. ofElectical and Computer Engineering, University ofCalifornia Santa Barbara, Santa Barbara CA 93106 mdavanco@ece. ucsb. edu James Raring Materials Dept., University ofCalifornia Santa Barbara, Santa Barbara CA 93106 Abstract: Two broadband, InP photonic crystal optical filters with reduced back-reflections are demonstrated: one 10pm-long low-pass with 20dB stop-band extinction; one 30pm-long, 40-nm bandwidth notch with 20dB extinction. Both could find applications as band-rejection filters in monolithic InP photonic integrated circuits. © 2005 Optical Society ofAmerica OCIS codes: (130.3120) Integrated Optics Devices; (250.5300) Photonic Integrated Circuits 1. Introduction Extremely compact Photonic Crystal (PC) microcavity filters for optical communications have been proposed and demonstrated in the literature, with promising results for employment in monolithic Photonic Integrated Circuits (PIC) [1]. Due to the large refractive index discontinuities involved, very broadband filters can be designed, offering good prospects for applications in coarse DWM (CDWM)systems. In this work, we demonstrate two very compact and broadband deeply etched PC filters that could be incorporated into an InP monolithic Photonic Integrated Circuit (PIC) such as described in [2]. The first structure is a six-period, 20xl0[tm2 tilted rectangular array of air holes that provides a low-pass transfer function with an edge close to 2=1.54[tm with about 20dB sto