Graded-Index Microstructured Polymer Optical Fibres
In this chapter we describe the factors that limit the bandwidth of large-core multimode polymer fibres, including intramodal and intermodal dispersion. The latter is usually addressed by using a graded-index (GI) to equalise the group velocities of the fast and slow modes. While most GI fibres use differences in chemical composition to produce the index gradient, it is also possible to use a graded microstructure. Such fibres (denoted GImPOF) differ from conventional GI POF not just in having a microstructure, but also in having a much larger index contrast. We model the behaviour of a non-microstructured (i.e. azimuthally averaged) fibre with the same contrast. We present the modelling and experimental results for a GImPOF and assess its potential.
KeywordsGroup Velocity Fibre Bragg Grating Material Dispersion Plastic Optical Fibre Microstructured Optical Fibre
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