Bayvel, Polina L.; (1990) Investigation of Stimulated Brillouin scattering in single mode optical fibre ring resonators. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis describes the theoretical and experimental investigation of stimulated Brillouin scattering (SBS) in single mode optical fibres and all-fibre ring resonators. SBS is a nonlinear threshold effect which occurs in single mode fibres at low optical pump powers, and can be a limitation in optical fibre coherent transmission systems. High finesse optical fibre ring resonators are attractive for the study of SBS as their geometry offers a very low round-trip loss coupled with a significant enhancement of the circulating power over the input power resulting in low SBS thresholds. After a review of the SBS theory and an overview of the research work carried out in the field of SBS in single mode optical fibres, the system of coupled equations which described the generation of the SBS process is solved numerically. The numerical results are compared with existing analytical solutions and published experimental data, and the implications and applications of the results to optical fibre transmission systems and Brillouin amplifiers are discussed. The evaluation of high finesse single-mode ring resonator operation carried out, including the fabrication, alignment, and characterisation of devices fabricated from ordinary and polarisation maintaining fibre, at 633 nm and 830 nm is described. The theoretical and experimental investigation of SBS generation in all-fibre single mode ring resonators is presented. An analytical theory describing the operation and performance parameters of all-fibre Brillouin lasers is derived, and a numerical modelling of the transient operation of the Brillouin laser is carried out. The transient and steady-state characteristics of a Brillouin amplifier based on an all-fibre ring resonator are considered. The experimental investigation of the operation of all-fibre Brillouin lasers is described. Particular attention focuses on the semiconductor laser pumped Brillouin laser and the first demonstration of this device operating at a submilliwatt threshold is presented. The processes of four wave mixing (FWM) and a related process of Brillouin enhanced four wave mixing (BEFWM) are observed for the first time in all-fibre ring resonators, and the physics of these processes is considered. The applications of the work in this thesis including local oscillators, generation and distribution of high frequency microwave components, amplification, and phase conjugation are also discussed.

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