A novel cost-effective combline generation and cross-talk mitigation in optical OFDM signal using optical iFFT circuits

Abstract

This paper is focused on the proposed novel techniques for cost-effective and high performance optical OFDM systems. We propose a novel cost-effective optical comb-line generation source to produce 8-sub-carriers with spectral flatness of <1dB with drive amplitudes of 1Vpi employing single dual-drive Mach-Zehnder-Modulator and show a comparison with other efficient comb-generator methods. We also propose a novel optical iFFT-based implementation for 87.5 Gbit/s optical NRZ-OFDM generations. It is shown that the cross-talk introduced by imperfect WDM demultiplexer to separate sub-carriers for modulation can be significantly reduced.

A Survey of Optical Carrier Generation Techniques for Terabit Capacity Elastic Optical Networks

“…Two approaches have been pursued to reduce the RF drive power requirements namely: i) optimization of RF signals ii) employ alternative materials in order to achieve low V π modulators. On the first approach, Mishra et al simulated the effect of using different RF drive signals, in order to find an optimum solution for generating an OFC with less drive power, but with the same spectral flatness and number of lines [99]. In subsequent work [100], the authors demonstrated generation of a 9 line OFC, exhibiting a 1.1 dB of spectral flatness and a 6.25 GHz frequency spacing, using a single DD-MZM (V π = 3.5V), driven by 1 − 1.6V π amplitude RF signals.…”