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Proceedings Paper

High-speed electro-optic modulators and switches on LiNbO3
Author(s): Thomas Pohlmann; Andreas Neyer; Edgar I. Voges
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Paper Abstract

High-speed electro-optic modulators and switches have important applications in external modulator systems and high-speed instrumentation. Phase-linear switching at high frequencies is accomplished by using balanced bridge interferometric switches with electro-optic tunable X-couplers. The devices are fabricated by titanium indiffusion into X-cut Y-propagating LiNbO3. For high-speed operation, traveling-wave electrodes of aluminium and gold are realized and investigated. Devices with a 3-dB bandwidth of 6.5 GHz using coplanar traveling-wave electrodes with a switching voltage of 7.0 V, an overall insertion loss of 4 dB and -35 dB extinction ratio are realized for ) = I .3 pm. The relations to determine the theoretical maximum 3-dB bandwidth of traveling-wave modulators rely on infinitely thin electrodes and the quasi-TEM approximation, which is not the case in practice. The influence of finite electrode thickness on the frequency response will be discussed. LiNbO3 devices show dc drift effects when applying dc voltages resulting in a temporal change of the output power of optical modulators and switches. Improvements in dc drift stability due to electrodes and buffer layers of indium-tin-oxide are reported. The performance of a new high-speed wavelength selective switch based on two-mode interference will be presented.

Paper Details

Date Published: 1 August 1990
PDF: 12 pages
Proc. SPIE 1274, Electro-Optic and Magneto-Optic Materials II, (1 August 1990); doi: 10.1117/12.20482
Show Author Affiliations
Thomas Pohlmann, Univ. Dortmund (Germany)
Andreas Neyer, Univ. Dortmund (Germany)
Edgar I. Voges, Univ. Dortmund (Germany)

Published in SPIE Proceedings Vol. 1274:
Electro-Optic and Magneto-Optic Materials II
Hans Dammann, Editor(s)

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