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Extinction Ratio Adjustment for the Coupler-Type Wavelength Demultiplexer Made by K+-Ion Diffused Waveguides
Kiyoshi KISHIOKA Yoshinori YAMAMOTO
IEICE TRANSACTIONS on Electronics
Publication Date: 1994/11/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory)
demultiplexer, directional coupler, ion-exchange waveguide, integrated optical device,
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In this paper, a novel coupler-type wavelength demultiplexer composed of the K+-ion diffused waveguides, which has an adjustment function for optimizing the diffusion depth, is proposed to achieve reliably the high extinction ratio. The optimization in the diffusion depth is made by repeating the K+-ion diffusion and extinction-ratio measurement alternatively, and the high extinction ratios more than 20 dB are measured reliably at both operation wavelengths of 0.6328 and 0.83 µm. Experimental results on the polarization dependence in the extinction-ratio adjustment are also reported.