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Investigations into optical fibre-ring resonators

Kadiwar, Rajeshkumar K.; (1990) Investigations into optical fibre-ring resonators. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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This thesis is concerned with the theoretical and experimental characterisation of the all fibre ring resonator. Active and passive versions of the ring resonator fibre optic gyroscope are examined as specific applications for the fibre ring resonator. Firstly, the characteristics of ring resonators formed with polarisation maintaining fibre are investigated. Polarisation mode cross coupling within the fibre resonator is shown to cause the resonant polarisation eigenmodes of the device to become dependent upon the loop birefringence. Resonance splitting effects and a non-linear phase separation between the resonant eigenmodes with loop birefringence is found to follow. The effects of polarisation anisotropy within the resonator are presented in detail. Several methods to reduce this polarisation instability are evaluated theoretically and a novel method demonstrated experimentally. The limitations of the ring resonator due to the non-linear stimulated Brillouin scattering process are then investigated. The depletion effect due to the onset of stimulated Brillouin lasing in fibre resonators is shown to lead to finesse and modulation depth variations with input power. The dependence of these effects upon resonator and material parameters is characterised. Two novel schemes for suppressing the onset of stimulated Brillouin lasing are presented. The drift characteristics of passive ring resonator gyroscopes made with polarisation maintaining fibre are theoretically calculated. The feasibility of various polarisation stabilisation schemes are evaluated. One of the first solid-state stimulated Brillouin ring laser gyroscopes is also demonstrated. The design criteria of this gyroscope are presented. The frequency lock-in effect is shown to occur in this gyroscope and a novel scheme that avoids this effect is demonstrated.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Investigations into optical fibre-ring resonators
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Thesis digitised by ProQuest.
Keywords: Applied sciences; Fiber optics
URI: https://discovery.ucl.ac.uk/id/eprint/10109907
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