Gain-flattening filters (GFFs) are key wavelength division multiplexing components in fiber-optics telecommunications. Challenging issues in the design of thin-film GFFs were recently the subject of a contest organized at the 2001 Conference on Optical Interference Coatings. The interest and main difficulty of the proposed problem was to minimize the sensitivity of a GFF to simulated fabrication errors. A high-yield solution and its design philosophy are described. The approach used to control the filter robustness is explained and illustrated by numerical results.
© 2002 Optical Society of America
(060.4510) Fiber optics and optical communications : Optical communications
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.4170) Optical devices : Multilayers
(310.0310) Thin films : Thin films
Pierre G. Verly, "Design of a Robust Thin-film Interference Filter for Erbium-doped Fiber Amplifier Gain Equalization," Appl. Opt. 41, 3092-3096 (2002)