Array Antenna Integrated Quantum Well Optical Modulator for 60 GHz Band Radio over Fiber System

We propose and demonstrate a planar array antennacoupled InGaAs/InAlAs multiple quantum well (MQW) optical phase modulator for use in radio over fiber systems, targeting 60 GHz-band millimeter-wave wireless transmissions.This modulator includes an assembly of five types of five-layer asymmetric coupled quantum wells (FACQWs) and a two-element array antenna.The design of the FACQWs enables a considerable change in the refractive index in response to minimal electric fields generated by the antenna.The modulator achieved a carrier-to-sideband ratio (CSR) of up to 45.9 dB at a power density of 11 W/m 2 , which corresponds to a phase shift of 10.1 mrad.The phase shift characteristics of a four-element array antenna modulator are also analyzed.