Optical Heterodyne Analog Radio-Over-Fiber Link for Millimeter-Wave Wireless Systems

Optical heterodyne analog radio-over-fiber (A-RoF) links provide an efficient solution for future millimeter wave (mm-wave) wireless systems. The phase noise of the photo-generated mm-wave carrier limits performance such links, especially, transmission low subcarrier baud rate multi-carrier signals. In this work, we present three different techniques compensation laser frequency offset (FO) and (PN) in optical A-RoF system. first approach advocates use receiver; second uses standard digital signal processing (DSP) algorithms, while third approach, a photonic integrated mode locked (MLL) with reduced DSP is advocated. FO PN these approaches demonstrated by successfully transmitting 1.95 MHz spaced orthogonal division multiplexing (OFDM) over 25 km 61 GHz link. advantages limitations are discussed detail regard to recent 5G recommendations, highlighting their potential deployment next generation