Generation and transmission of 85.4 Gb/s realtime 16QAM coherent optical OFDM signals over 400 km SSMF with preamble-less reception

This paper presents a real-time, coherent optical OFDM transmitter based on a field programmable gate array implementation. The transmitter uses 16QAM mapping and runs at 28 GSa/s achieving a data rate of 85.4 Gb/s on a single polarization. A cyclic prefix of 25% of the symbol duration is added enabling dispersion-tolerant transmission over up to 400 km of SSMF. This is the first transmission experiment performed with a real-time OFDM transmitter running at data rates higher than 40 Gb/s. A key aspect of the paper is the introduction of a novel method for OFDM symbol synchronization without relying on training symbols. Unlike conventional preamble-based synchronization methods which perform cross-correlations at regular time intervals and let the system run freely in between, the proposed method performs synchronization in a continuous manner ensuring correct symbol alignment at all times

InGaAsP multiple-quantum well Fabry-Perot optical modulators for soliton systems at #lambda# = 1.55 #mu#m

SIGLEAvailable from British Library Document Supply Centre-DSC:D200160 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Comparison of dispersion compensating fibre gratings and dispersion compensating fibre in multispan standard fibre WDM links

Transmission of 10Gbit/s per channel WDM over standard fibre using dispersion compensating fibre gratings and dispersion compensation fibre is investigated. The performance of the two techniques in the presence of self- and cross-phase modulation and for RZ and NRZ signal formats is compared

Reach enhancement of 100 % for a DP-64QAM super-channel using MC-DBP

A digital coherent super-receiver enables the reception and demodulation of a 7x10GBd DP-64QAM Nyquist spaced super-channel. Multi-channel DBP provides a 100% improvement in reach from 640km to 1280km of SSMF, with an ISD of 9.15b/s/Hz