Power penalties due to in-band and out-of-band dispersion in FBG cascades

Ylä-Jarkko, K.H., Zervas, M.N., Durkin, M.K., Barry, Ian E. and Grudinin, A.B. (2003) Power penalties due to in-band and out-of-band dispersion in FBG cascades. IEEE Journal of Lightwave Technology, 21 (2), 506-510. (doi:10.1109/JLT.2003.808763).

Abstract

We measure the in-band dispersion penalty in a cascade of five 50-GHz low-dispersion linear-phase fiber Bragg gratings (FBGs) and compare the results with conventional apodised FBGs. At the 0.5-dB power penalty level, the usable bandwidth of a single linear-phase FBG (40 GHz) is twice as wide as that of a conventional apodised FBG (19 GHz). The bandwidth-utilization factor of a single linear-dispersion grating is 89%, while for the five-grating cascade, it is 76%. To our knowledge, these are the highest values reported to date for cascaded optical devices. The corresponding factors for the conventional gratings are 53% and 31%. We also measure the additional penalty on a dropped channel caused by a cascade of five adjacent-channel gratings. The bandwidth narrowing due to the adjacent-channel FBGs is 6 GHz both for linear-phase and conventional FBGs, giving a usable bandwidth of 34 GHz (linear-phase) and 13 GHz (conventional).

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Contributors

Author: M.N. Zervas

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