A 176‐190 GHz transmitter module using indium phosphide and gallium arsenide MMICs

Abstract

their polarization dependence. Our results clearly show the possibility of achieving polarization-insensitive operation in the presence of stress-induced birefringence and that the polarizationinsensitive condition can be maintained over a wide range of temperature. A temperature sensitivity of Ϫ0.14 nm/°C for the Bragg wavelength was obtained with an epoxy-clad Bragg grating, which is an order of magnitude larger than the value achieved with a fiber Bragg grating or a Bragg grating fabricated on a silica waveguide [12, 13]. Realization of tunable polarization-insensitive filters with Bragg gratings fabricated in simple polymer waveguide structures is promising.

A 180–196 GHz image‐reject Schottky‐diode MMIC mixer

“…Future systems may take advantage of the greater bandwidths available at higher frequencies in atmospheric transmission windows near 140 and 200 GHz to enable higher data rates, possibly up to 40 Gb/s. Earlier articles described receiver and transmitter modules, based on InP and GaAs MMICs, that could be used to demonstrate a point-topoint telecommunications link in the 176 -190 GHz band [6,7]. In these modules, the overall gain achieved was limited by the HEMT-based MMIC mixer, which exhibited relatively high conversion loss.…”