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Misalignment effects on the spectral characteristics of edge filters based on singlemode–multimode–singlemode (SMS) fibre structures are investigated numerically and experimentally. A modal propagation analysis is used with a set of guided modes calculated using the finite-difference method to determine the transmission loss of the SMS-based edge filters. A limit for the tolerable misalignment of the SMS fiber-based edge filter is proposed, beyond which the spectral performance of the SMS structure degrades unacceptably. The numerical results are verified experimentally with good agreement.
Hatta, A. et al (2009) Misalignment limits for a singlemode-multimode-singlemode fiber-based edge filter. Journal of Lightwave Technology, Vol.27, no.13, pp.2482-2488. DOI 10.1109/JLT.2008.2011499