Open AccessInGaAs/InAlAs multiple-quantum-well optical modulator integrated with a planar antenna for a millimeter-wave radio-over-fiber system
Author(s) -
Yusuke Miyazeki,
Hiroto Yokohashi,
Shotaro Kodama,
Hiroshi Murata,
Taro Arakawa
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.389574
Subject(s) - radio over fiber , extremely high frequency , materials science , optical modulator , optics , optoelectronics , modulation (music) , antenna (radio) , sideband , phase modulation , quantum well , radio frequency , compatible sideband transmission , modulation index , refractive index , optical fiber , physics , telecommunications , phase noise , power (physics) , laser , pulse width modulation , quantum mechanics , computer science , acoustics
An InGaAs/InAlAs multiple-quantum-well (MQW) optical phase modulator integrated with a planar antenna for a millimeter-wave (MMW) radio-over-fiber (RoF) system is fabricated, and its high-speed modulation under irradiation of MMW signals is experimentally demonstrated. The modulator exhibits a carrier-to-sideband ratio (CSR) of 62.7 dB, corresponding to a phase shift Δϕ of 1.46 mrad under irradiation of MMW signals with an RF power density P of ∼77 W/m 2 at a frequency of 57.5 GHz. The modulator is operated over the C band in optical communications. The modulation operation was attributed to the large change in refractive index caused by the quantum-confined Stark effect in the MQW. This is the first case where the refractive index change of a semiconductor was used as an antenna-coupled optical modulator.