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Highly Linear Broadband Optical Modulator Based on Electro-Optic Polymer

TitleHighly Linear Broadband Optical Modulator Based on Electro-Optic Polymer
Publication TypeJournal Article
Year of Publication2012
AuthorsZhang, X., B. Lee, C-Y. Lin, A. X. Wang, A. Hosseini, and R. T. Chen
JournalIEEE Photonics Journal
Volume4
Issue6
Pagination2214 - 2228
Date Published12/2012
Abstract

In this paper, we present the design, fabrication, and characterization of a traveling-wave directional coupler modulator based on electro-optic polymer, which is able to provide both high linearity and broad bandwidth. The high linearity is realized by introducing Δβ -reversal technique in the two-domain directional coupler. A traveling-wave electrode is designed to function with bandwidth-length product of 302 GHz·cm , by achieving low microwave loss, excellent impedance matching, and velocity matching, as well as smooth electric-field profile transformation. The 3-dB bandwidth of the device is measured to be 10 GHz. The spurious-free dynamic range of 110 dB ±3 Hz2/3 is measured over the modulation frequency range of 2-8 GHz. To the best of our knowledge, such high linearity is first measured at the frequency up to 8 GHz. In addition, a 1 × 2 multimode interference 3-dB splitter, a photobleached refractive index taper, and a quasi-vertical taper are used to reduce the optical insertion loss of the device.

DOI10.1109/JPHOT.2012.2228477
Short TitleIEEE Photonics J.