Simple intradyne PSK system for udWDM-PON.

A homodyne coherent receiver for ultra-dense WDM-PON with off the shelf components is presented. It consists of a conventional DFB, phase switched clock signal, an optical coupler instead of a 90° hybrid, balanced photodetectors and digital signal processing. The phase swing for a DBPSK signal was optimized and the performance was experimentally evaluated in terms of the sensitivity for several laser linewidths.

Experimental demonstration of a cost-effective bit rate variable IM/DD optical OFDM with reduced guard band.

We experimentally demonstrate an intensity modulated and direct detection optical OFDM with variable bit rate from 5 Gb/s to 9 Gb/s using BPSK format. A fast processing based on the Hartley transform is performed with low complexity DSP, achieving the same performance as 4QAM FFT-based processing. Using the same bandwidth occupancy as required for 5 Gb/s, the bit rate can be increased up to 80% and transmitted over 25 km SSMF, by reducing the guard band and adopting an optimized transceiver design with additional overhead, including half-length training symbols and cyclic extension.

Experimental investigation of channel crosstalk in a time-switched phase-diversity optical homodyne receiver.

Theoretical and experimental study of channel crosstalk effects in time-switched phase-diversity optical homodyne reception is presented, focused toward ultradense WDM passive optical networks. This receiver achieves ultralow channel spacing of 3 GHz per 1 dB power penalty at 1 Gbit/s and feasible implementation.

Homodyne receiver prototype with time-switching phase diversity and feedforward analog processing.

A differential phase shift keying homodyne optical receiver is experimentally demonstrated based on time-switching phase diversity, without the need for a 90 degrees optical hybrid. It achieves high tolerance to phase noise and feasible implementation with off-the-shelf electrical and optical components.