Análisis comparativo del desempeño de receptores ópticos coherentes y no coherentes para GFDM en redes PON.

Abstract

The objective was to analyse the performance of GFDM transmission using coherent and noncoherent optical receivers, for which a transmission of a radio frequency signal over fiber was made using GFDM signal on a passive optical network (PON) at 10 Gb/s through an OptSim-Matlab cosimulation. The need to improve the performance of future 5G networks will mean that the fronthaul

will be a high-speed link implemented over an optical fiber, to guarantee the requirements of the new

generation mobile network.

In order to satisfy user data rates higher than 10 Gb/s, with a latency less than 1 ms, one of the main candidates is the GFDM multi-carrier scheme as a 5G waveform. The challenge is to increase the fronthaul link capacity which depends on the combination of: the type of optical detection that is used, the modulation formats and digital post-processing of the signal. In addition, a good option for the transmission scheme to be used is the coherent transmission, because this substantially increases the performance capacity of an optical network compared to schemes based on intensity modulation and direct detection. The results obtained show an appreciable improvement in the receiver sensitivity (around 3 dB) using a coherent detector. Within this perspective it is envisioned that the coherent detection will allow to increase the capacity of the fronthaul optical networks. However, an important disadvantage of the coherent transmission is its high implementation cost. Additionally, dispersion pre-compensation and post-compensation studies could be carried out introduced in the signal by the propagation of its in the optical fiber.