Etch-tuned ridged waveguide magneto-optic isolator

Abstract

Isolation ratios as large as 3000 to 1 (−35 dB) at wavelengths near 1.55 μm have been measured on ridged waveguide Faraday rotation isolators. These are the best results ever reported for any waveguide isolator. Single-mode, triple-layer bismuth yttrium iron garnet films were chemically etched to reduce the linear birefringence of the active top layer to zero at 1.49 μm. Ion implantation enhanced etching was used to create ridges 8 μm wide and 0.5 μm high. Using fiber coupled light from a tunable color center laser, isolation ratios of −25 dB or better were achieved over a wavelength range of ±0.03 μm near 1.5 μm. A silica overlayer was used to increase the effective thickness of the active layer and raise the optimum wavelength from 1.49 to 1.55 μm.

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A new full-vectorial FD-BPM scheme: application to the analysis of magnetooptic and nonlinear saturable media

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“…• /cm and λ = 1.485 µm [16]. The Faraday rotation effect is responsible for a periodic power transfer between the transverse components E x and E y .…”

“…1. This structure was originally designed to operate as an isolator based upon Faraday rotation [15], [16]. The waveguide layer is made of bismuth yttrium iron garnet (Bi-YIG) with thickness t 1 = 3.1 µm.…”