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Open AccessFeature PaperArticle

Application of Semiconductor Optical Amplifier (SOA) in Managing Chirp of Optical Code Division Multiple Access (OCDMA) Code Carriers in Temperature Affected Fibre Link

Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow G1 1XW, UK
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Appl. Sci. 2018, 8(5), 715; https://doi.org/10.3390/app8050715
Received: 27 March 2018 / Revised: 30 April 2018 / Accepted: 30 April 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Applications of Semiconductor Optical Amplifiers)
Chromatic and temperature induced dispersion can both severely affect incoherent high data rate communications in optical fibre. This is certainly also true for incoherent optical code division multiple access (OCDMA) systems with multi-wavelength picosecond code carriers. Here, even a relatively small deviation from a fully dispersion compensated transmission link can strongly impact the overall system performance, the number of simultaneous users, and the system cardinality due to the recovered OCDMA auto-correlation being strongly distorted, time-skewed, and having its full width at half maximum (FWHM) value changed. It is therefore imperative to have a simple tunable means for controlling fibre chromatic or temperature induced dispersion with high sub-picosecond accuracy. To help address this issue, we have investigated experimentally and by simulations the use of a semiconductor optical amplifier (SOA) for its ability to control the chirp of the passing optical signal (OCDMA codes) and to exploit the SOA ability for dispersion management of a fibre link in an incoherent OCDMA system. Our investigation is done using a 19.5 km long fibre transmission link that is exposed to different temperatures (20 °C and 50 °C) using an environmental chamber. By placing the SOA on a transmission site and using it to manipulate the code carrier’s chirp via SOA bias adjustments, we have shown that this approach can successfully control the overall fibre link dispersion, and it can also mitigate the impact on the received OCDMA auto-correlation and its FWHM. The experimental data obtained are in a very good agreement with our simulation results. View Full-Text
Keywords: group velocity dispersion; chirp; optical code division multiple access auto-correlation; fibre propagation; chromatic dispersion; temperature induced dispersion; super-continuum generation; optical code division multiple access transmitter; optical code division multiple access receiver/decoder; semiconductor optical amplifier group velocity dispersion; chirp; optical code division multiple access auto-correlation; fibre propagation; chromatic dispersion; temperature induced dispersion; super-continuum generation; optical code division multiple access transmitter; optical code division multiple access receiver/decoder; semiconductor optical amplifier
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Ahmed, M.S.; Glesk, I. Application of Semiconductor Optical Amplifier (SOA) in Managing Chirp of Optical Code Division Multiple Access (OCDMA) Code Carriers in Temperature Affected Fibre Link. Appl. Sci. 2018, 8, 715.

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