Time-domain large-signal modeling of traveling-wave modulators on SOI

Authors: Bahrami, HadiSepehrian, HassanPark, Chul SooRusch, LeslieShi, Wei
Abstract: Silicon photonic modulators have strong nonlinear behavior in phase modulation and frequency response, which needs to be carefully addressed when they are used in highcapacity transmission systems. We demonstrate a comprehensive model for depletion-mode Mach–Zehnder modulators (MZMs) on silicon-on-insulator, which provides a bridge between device design and system performance optimization. Our methodology involves physical models of p–n–junction phase-shifters and traveling-wave electrodes, as well as circuit models for the dynamic microwave-light interactions and time-domain analysis. Critical aspects in the transmission line design for high-frequency operation are numerically studied for a case of p–n–junction loaded coplanar-strip electrode. The dynamic interaction between light and microwave is simulated using a distributed circuit model solved by the finite-difference time-domain method, allowing for accurate prediction of both small-signal and large-signal responses. The validity of the model is confirmed by the comparison with experimental results for a series push–pull MZM with a 6 mm phase shifter. The simulation shows excellent agreement with experiment for high-speed operation up to 46 Gb/s. We show that this time-domain model can well predict the impact of the nonlinear behavior on the large-signal response, in contrast to the poor prediction from linear models in the frequency domain.
Document Type: Article de recherche
Issue Date: 1 June 2016
Open Access Date: 14 September 2016
Document version: AM
Permalink: http://hdl.handle.net/20.500.11794/9828
This document was published in: Journal of Lightwave Technology, Vol. 34 (11), 2812-2823 (2016)
Institute of Electrical and Electronics Engineers
Alternative version: 10.1109/JLT.2016.2551702
Collection:Articles publiés dans des revues avec comité de lecture

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