Sensitivity assessment of coherent optically preamplified PPM systems

Pavlos Theodorou; Jaafar M. H. Elmirghani

doi:10.1117/12.290396

10 October 1997 Sensitivity assessment of coherent optically preamplified PPM systems

Pavlos Theodorou, Jaafar M. H. Elmirghani

Proceedings Volume 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III; (1997) https://doi.org/10.1117/12.290396
Event: Voice, Video, and Data Communications, 1997, Dallas, TX, United States

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.

Citation Download Citation

Pavlos Theodorou and Jaafar M. H. Elmirghani "Sensitivity assessment of coherent optically preamplified PPM systems", Proc. SPIE 3230, All-Optical Communication Systems: Architecture, Control, and Network Issues III, (10 October 1997); https://doi.org/10.1117/12.290396

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KEYWORDS

Receivers

Optical amplifiers

Interference (communication)

Homodyne detection

Optical filters

Signal to noise ratio

Optical fibers

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