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Proceedings Paper

Sensitivity assessment of coherent optically preamplified PPM systems
Author(s): Pavlos Theodorou; Jaafar M. H. Elmirghani
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Paper Abstract

The main objective of this paper is to investigate the application of an erbium doped fiber amplifier (EDFA) in a coherent receiver using the pulse position modulation (PPM) format. Such a combination can exploit the abundant monomode fiber bandwidth to offer improved sensitivity and improved multichannel selectivity through the exploitation of coherent transmission. Original theoretical results are presented for a system operating in thermal noise dominant condition at a bit rate of 622 Mbit/s and a wavelength of 1.53 micrometer. By using a suboptimal matched filter the results demonstrate that the system offers 7.5 dB sensitivity improvement over a homodyne PPM system and 9.4 dB improvement over PSK homodyne. The system investigated also offers a 10.4 dB sensitivity improvement over an equivalent optically preamplified direct detection (DD) PPM system. It is also demonstrated that by using an optical filter in order to reduce the ASE noise due to EDFA the improvement in receiver sensitivity was only 0.3 dB. This greatly reduces the requirement for optical filters in coherent systems and therefore the full bandwidth of the optical amplifiers can be utilized.

Paper Details

Date Published: 10 October 1997
PDF: 12 pages
Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); doi: 10.1117/12.290396
Show Author Affiliations
Pavlos Theodorou, Univ. of Northumbria/Newcastle (United Kingdom)
Jaafar M. H. Elmirghani, Univ. of Northumbria/Newcastle (United Kingdom)


Published in SPIE Proceedings Vol. 3230:
All-Optical Communication Systems: Architecture, Control, and Network Issues III
John M. Senior; Robert A. Cryan; Chunming Qiao, Editor(s)

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