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Chromatic and temperature induced dispersion can both severely affect incoherent high data rate communications in optical fiber. 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 fiber 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 exploit the SOA ability for dispersion management of a fiber link in an incoherent OCDMA system. Our investigation is done using a 19.5 km long fiber transmission link exposed to different temperatures (20 and 50) oC using an environmental chamber. By placing the SOA on a transmission site and using it to manipulate the code carriers chirp via SOA bias adjustments, we have shown that this approach can successfully control the overall fiber link dispersion, and can also mitigate the impact on the received OCDMA auto-correlation and it’s FWHM. The experimental data obtained are in a very good agreement with our simulation results.

applied sciences

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