Selective delivery of broadband wireless and wired services in an integrated ROF-PON system using dual-sideband optical carrier suppression

Abstract

Selective delivery of gigabit-per-second wireless and wired services is demonstrated in an integrated fiber-wireless access network using the millimeter-wave (mm-wave) radio-over-fiber (RoF) system employing the dual-sideband optical carrier suppression technique. A dual-electrode Mach-Zehnder modulator is used in this technique to generate 40 GHz carrier to distribute 1.25 Gbps data via direct modulation (DM) over a 20 km RoF system. The results show that selective signal delivery can be achieved using a low-cost DM laser diode drive current of 20 mA. The advantage of the proposed system is that it provides versatility to control the gigabit-per-second (Gbps) signal delivery in an integrated ROF-PON system with a common high frequency oscillator shared for the whole system. ABSTRACT: In "A Wideband Ultrathin Low Profile MetamaterialMicrowave Absorber" published in the 57th volume of Microwave and Optical Technology Letters, the authors come to the conclusion that the proposed structure can realize a broadband absorber, which we cannot agree with. In our opinion, it should be cross-polarization reflection rather than absorption.