EE Seminar: Error analysis and mitigation
Speaker: Omer Onn
M.Sc. student under the supervision of Dr. Ofer Amrani
Wednesday, October 25th 2017 at 15:00
Room 011, Kitot Bldg., Faculty of Engineering
Optical OFDM Self Coherent detection – Error analysis and mitigation
Abstract
An improved self-coherent DSP-based optical receiver that utilizes polarization diversity is presented and analyzed. It is aimed at demonstrating that coherent performance can be approached by employing field reconstruction on differential-phase detection and judicious digital signal processing. Performance is improved compared to known techniques by addressing two of the issues associated with self-coherent detection: 1. the phase drift caused by theduring field reconstruction; and 2. the loss of synchronization induced by a zero-intensity sample with undefined phase. These will be met with phase estimation and periodic correction, and with polarization-diversity and a non-linear quantization scheme, respectively. It is demonstrated by means of simulations that the improved receiver allows achieving detection of an Optical Orthogonal Frequency Division Multiplexing at a pre-coded BER of 10-5, with 12 bit non-uniform quantization, over an 18dB Signal-to-Noise Ratio channel. This is compared to both a coherent receiver and Direct Digital Self-Coherent Detection (DSCD) and cross-polarizedation-DSCD (X-DSCD), upon which the receiver discussed in this work is based.
