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Proceedings Paper

Broadening the bandwidth and increasing the efficiency of traveling-wave integrated-optic modulators
Author(s): Evgeny M. Zolotov; V. M. Pelekhaty; Robert F. Tavlykaev
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Paper Abstract

New chirped-toothed electrodes with triangular or trapezoidal edges are invented for Z-cut LiNbO3 travelling-wave integrated-optic channel modulators. Such electrodes produce sweeped-frequency sinusoidally oscillating spatial dependencies of the local electro-optic interaction efficiency upon the coordinate along the direction of wave propagation. These dependencies are obtained for lossless electrodes by the reverse Fourier transform implying the desirable uniform rectangular magnitude-frequency-response and quadratic phase-frequency-response of the designed modulator. The invented electrodes ensure either equiefficient bandwith broadening or modulation efficiency increase in the fixed frequency band depending on the implied frequency response. The influence of the frequency dependent rf losses is corrected by an appropriate amplitude modification of the electro-optic interaction dependence for initially lossless electrodes. For example, two electrode structures (1 cm and 7.5 mm long) are designed for the broadband (up to 160 GHz) and bandpass (from 80 GHz up to 160 GHz) modulators. The computed magnitude frequency responses show perfect uniformity in the frequency band taking into account the influence of the frequency dependent rf losses of 1 - 2 dB (DOT) cm-1 (DOT) GHz-1/2.

Paper Details

Date Published: 14 May 1993
PDF: 14 pages
Proc. SPIE 1932, Guided-Wave Optics, (14 May 1993); doi: 10.1117/12.145584
Show Author Affiliations
Evgeny M. Zolotov, General Physics Institute (Russia)
V. M. Pelekhaty, General Physics Institute (Russia)
Robert F. Tavlykaev, General Physics Institute (Russia)

Published in SPIE Proceedings Vol. 1932:
Guided-Wave Optics
Alexander M. Prokhorov; Evgeny M. Zolotov, Editor(s)

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