Improvement of Temperature Independencies in Multilayered Tunable Optical Separators Using Surface Acoustic Waves

Nobuo GOTO  Yasumitsu MIYAZAKI  Yasuo AKAO  

IEICE TRANSACTIONS (1976-1990)   Vol.E68   No.10   pp.698-704
Publication Date: 1985/10/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Optical and Quantum Electronics

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Temperature dependence of a SAW-controlled optical wavelength demulti-/multiplexer has been discussed. The device consists of ZnS/Ta2O5/Nb2O5 thin-films on a Y-cut LiNbO3 substrate. The tuning SAW frequency for the optical switching shifted with temperature by -0.20 MHz/. It is theoretically found that a temperature-independent demulti-/multiplexer can be realized when two waveguides possess the similar temperature properties. When the device is used in a narrow wavelength range, the device constituted of nearly degenerated waveguides exhibits small temperature dependence. These results were experimentally verified. In a nearly degenerated device, the temperature dependence was approximately +0.02 MHz/. The other device having small temperature-dependence was fabricated with a ZnS/Ta2O5/Ti-diffused waveguide on a Y-cut LiNbO3, whose temperature dependence was +0.02 MHz/.