Effects of Optical Phase Noise and Fiber Dispersion on Performance of LTE-A Signal Transmission over a Seamless Fiber-MMW System

摘要

Optical phase noise and fiber dispersion induced effects are important impairments that would limit the performance of a seamless fiber-wireless system. In this paper, we experimentally investigate the effects of these impairments on performance of an LTE-A signal transmission over a seamless fiber-millimeter-wave system at 92.5 GHz. To evaluate the effects of optical phase noise, we compare the performance of a modulator-based optical two-tone signal generator using dual-wavelength and single-wavelength with different fiber-delay lengths for data modulation, and an optical heterodyne system using a free-running laser for a local oscillator. For evaluation of fiber dispersion induced effects, different fiber transmission lengths are used for the signal transmission in each case. At the receiver, to avoid the effects of frequency offset and electrical phase noise, a simple direct detection scheme using an envelope detector is used.