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Proceedings Paper

InP PIC technologies for high-performance Mach-Zehnder modulator
Author(s): Y. Ueda; Y. Ogiso; N. Kikuchi
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Paper Abstract

We have developed compact InP-based Mach-Zehnder modulators (MZMs) for small-form-factor pluggable coherent transceivers. In this paper, we introduce InP-based photonic integration circuit (PIC) technologies for high-performance MZMs. As the first topic, we show our design concept for a multi-quantum well (MQW) with a large refractive-index change and a low excess loss for a low-loss MZM with a low driving voltage. We fabricated dual polarization (DP) inphase and quadrature modulators (IQMs) in the form of a PIC in which we monolithically integrated a quad MZM based on the designed MQW. It operated at a half-wavelength voltage of 1.9 V with an excess loss of less than 1 dB as designed. We achieved 32-Gbaud DP-QPSK operation with a 0.2-dB penalty compared with a lithium niobate modulator. We also show another newly developed high-speed IQM for future higher-speed systems. We reduced the RF signal loss of an MZM by reducing the series resistance of the overcladding and optimizing the RF electrode structure. The fabricated high-speed IQM operated at higher than 64 Gbaud with QPSK/16QM modulations. Furthermore, we present an InP-MZM integrated with a new type of spot-size converter (SSC) fabricated with a three-dimensional semiconductor process. The SSC integrated MZM exhibited an insertion loss improvement of ~3 dB compared with our conventional InP-MZM for an optical system with a 4.5-μm mode field diameter. The low loss characteristics are beneficial in that they allow us to reduce the MZM-module cost thanks to an improved loss budget for optical assembly.

Paper Details

Date Published: 28 January 2017
PDF: 7 pages
Proc. SPIE 10129, Optical Metro Networks and Short-Haul Systems IX, 1012905 (28 January 2017); doi: 10.1117/12.2253492
Show Author Affiliations
Y. Ueda, Nippon Telegraph and Telephone Corp. (Japan)
Y. Ogiso, Nippon Telegraph and Telephone Corp. (Japan)
N. Kikuchi, Nippon Telegraph and Telephone Corp. (Japan)

Published in SPIE Proceedings Vol. 10129:
Optical Metro Networks and Short-Haul Systems IX
Atul K. Srivastava; Benjamin B. Dingel; Youichi Akasaka, Editor(s)

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