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Analysis of segmented traveling-wave optical modulators

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3 Author(s)
Li, G.L. ; Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, CA, USA ; Mason, T.G.B. ; Yu, P.K.L.

A simple and comprehensive modeling approach is developed for analyzing the frequency response of segmented traveling-wave optical modulators. The approach is based on the microwave transmission (ABCD) matrix theory. The case study for a GaAs traveling-wave Mach-Zehnder modulator (MZM) verifies this analysis approach with excellent agreement to the reported experimental results; the analyses for the quantum-well-based MZMs and electroabsorption modulators indicate that the segmented traveling-wave design can provide much better bandwidth than the lumped-element or the continuous-traveling-wave counterparts, with a few decibels penalty in the electrical-to-optical (E/O) conversion gain if low-loss optical waveguides are available. Meandered transmission line design, which provides more design freedom, is also analyzed using this modeling approach.

Published in:

Lightwave Technology, Journal of  (Volume:22 ,  Issue: 7 )

Date of Publication:

July 2004

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