Relative intensity noise enhancement due to out-of-band dispersion in cascaded fibre Bragg gratings

We analyse the relative intensity noise (RIN) induced in a transmitted chan nel by the out-of-band dispersion from cascaded fibre Bragg gratings used f or dropping the adjacent channels. For wavelength-division-multiplexed syst ems having equal channel spacing, the RIN enhancement is due to the net out -of-band dispersion slope of the cascaded gratings and is considerably more significant than that due to propagation in fibre at the zero first-order dispersion wavelength. (C) 2000 Elsevier Science B.V. All rights reserved.