TRANSMISSION OF A TRUE SINGLE-POLARIZATION 40 GBIT S SOLITON DATA SIGNAL OVER 205KM USING A STABILIZED ERBIUM FIBER RING LASER AND 40 GHZ ELECTRONIC TIMING RECOVERY/

Four independently modulated 10 Gbit/s channels were transmitted over 205 km with a penalty of less than 1.5 dB. The pulse source comprised a stabilised 10 GHz erbium fibre ring laser, multiplexed to 40 Gbit/s in a single polarisation by four independent lithium niobate modulator s. Following transmission the requirement to kick start the demodulato r is avoided using a 40 GHz electronic clock recovery circuit with a 1 0 GHz output. The experiment is performed entirely with commercial com ponents and semiconductor laser diodes.