A new method to quantitatively compare focal ratio degradation due to different end termination techniques

Claire Poppett; Jeremy Allington-Smith

doi:10.1117/12.856114

14 July 2010 A new method to quantitatively compare focal ratio degradation due to different end termination techniques

Claire Poppett, Jeremy Allington-Smith

Proceedings Volume 7735, Ground-based and Airborne Instrumentation for Astronomy III; 77350U (2010) https://doi.org/10.1117/12.856114
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

We investigate the FRD performance of a 150 μm core fibre for its suitability to the SIDE project.¹ This work builds on our previous work² (Paper 1) where we examined the dependence of FRD on length in fibres with a core size of 100 μm and proposed a new multi-component model to explain the results. In order to predict the FRD characteristics of a fibre, the most commonly used model is an adaptation of the Gloge⁸model by Carrasco and Parry³ which quantifies the the number of scattering defects within an optical bre using a single parameter, d0. The model predicts many trends which are seen experimentally, for example, a decrease in FRD as core diameter increases, and also as wavelength increases. However the model also predicts a strong dependence on FRD with length that is not seen experimentally. By adapting the single fibre model to include a second fibre, we can quantify the amount of FRD due to stress caused by the method of termination. By fitting the model to experimental data we find that polishing the fibre causes a small increase in stress to be induced in the end of the fibre compared to a simple cleave technique.

Citation Download Citation

Claire Poppett and Jeremy Allington-Smith "A new method to quantitatively compare focal ratio degradation due to different end termination techniques", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77350U (14 July 2010); https://doi.org/10.1117/12.856114

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