For spectral filters with subnanometer bandwidth, precise control of the device components’ dimensions (error<λ/1000, where λ is the center wavelength) is critical. Theoretical results from the transfer-matrix method show that an electro-optic thin-film filter can have a subnanometer bandwidth and still tolerate a root-mean-square error in the thickness of each layer up to λ/100. Illustrative examples of an electro-optic thin-film spectral filter with 0.05-nm (6-GHz), −3-dB bandwidth are presented.
© 2004 Optical Society of America
(060.4080) Fiber optics and optical communications : Modulation
(060.4230) Fiber optics and optical communications : Multiplexing
(060.4510) Fiber optics and optical communications : Optical communications
Luc Gilles and Phuc Tran, "Flattop tunable dense-wavelength division-multiplexing filter-modulator," J. Opt. Soc. Am. B 21, 903-907 (2004)