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Proceedings Paper

Performance investigation of 112 Gb/s PDM-QPSK long-haul systems employing discrete mode lasers
Author(s): John O'Carroll; Vidak Vujicic; Nicolas Brochier; Laurent Bramerie; Liam P. Barry
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Paper Abstract

100-Gb/s coherent systems based on polarization-division multiplexed quadrature phase shift keying (PDMQPSK), with aggregate wavelength-division multiplexed (WDM) capacities approaching 10 Tb/s per fibre, are being widely deployed due to the benefits provided by coherent detection. The stringent linewidth requirements for lasers used in these systems only allow optical sources with certain phase noise characteristics to be employed. A major challenge is therefore to produce lasers with the requisite performance at low cost. Discrete mode laser diodes (DMLDs) can be designed for narrow linewidth emission and present an economic approach with a focus on high volume manufacturability of monolithic semiconductor lasers. In this paper the performance of a 112 Gb/s long-haul optical transmission system employing PDM-QPSK is investigated using a range of transmitter lasers with linewidth values ranging from 100 kHz to 5 MHz. A linewidth of 100 kHz was obtained from an external cavity laser (ECL) and linewidths ranging from 200 kHz to 5 MHz were obtained from DMLDs. The performance of the system is analysed through experimental measurements and simulations performed by Virtual Photonics Incorporated Transmission Maker (VPI™). Results are presented for back-to-back operation and after transmission through G.654 pure silica core fibre (PSCF) at distances up to 6930 km.

Paper Details

Date Published: 2 May 2014
PDF: 8 pages
Proc. SPIE 9134, Semiconductor Lasers and Laser Dynamics VI, 91341K (2 May 2014); doi: 10.1117/12.2052131
Show Author Affiliations
John O'Carroll, Eblana Photonics Ltd. (Ireland)
Vidak Vujicic, Dublin City Univ. (Ireland)
Nicolas Brochier, Orange Labs (France)
Laurent Bramerie, FOTON Lab., CNRS, Univ. Europenne de Bretagne (France)
Liam P. Barry, Dublin City Univ. (Ireland)

Published in SPIE Proceedings Vol. 9134:
Semiconductor Lasers and Laser Dynamics VI
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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