Design of high speed optical transmission systems

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The objective of the proposed research is to study the transmission impairments in fiber optic systems and design new components and systems that enhance the quality of transmission. In this research program, we propose to develop new system designs and multiplexing schemes that provide the best  transmission performance. We also develop analytical expressions for the error probability of systems based on differential phase shift keying (DPSK) in different propagation regimes. These analytic expressions are important because the calculation of error probability of a nonlinear fiber-optic system by numerical simulations is a formidable task.  In this research program, we will develop novel time division multiplexing(TDM) schemes based on soliton interaction to reduce the time-bandwidth product of a signal. Such a scheme increases the spectral efficiency and hence, it would enable to transmit more data in a channel with limited bandwidth. For cable TV applications, it is desirable to design optical fibers that can carry large powers without back-reflection due to stimulated Brillouin scattering (SBS). Large optical power launched into the optical fiber causes lattice vibrations resulting in acoustic waves. The acoustic waves reflect the incident optical signal due to acousto-optic interaction. In the proposed research program, simulation tools to model acoustic propagation and acousto-optic interaction in fibers will be developed. With the help of these tools, we explore  new optical fiber designs that suppress back-reflections. We also develop new techniques to suppress the back-reflection due to SBS using isolators and dissimilar fiber geometries. The system designs investigated during the research programs are benefecial to Canada because several Canadian industries are interested in these designs in which it is possible to launch high optical powers to their system/device.