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Use of Multimode Interference Couplers to Broaden the Passband of Dispersive Integrated WDM Filters

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Abstract

One of the problems encountered with conventional waveguide-based WDM filters now being developed for use in WDM telecommunications and computer fiber networks is that their spectral passbands are “peaked”. Deviation of a signal wavelength from the center of a filter passband thus introduces excess loss. All signal wavelengths and filters have therefore to be very precisely aligned if a high-performance system is to be obtained, which places very tight constraints on both device and system design and operation.

© 1996 Optical Society of America

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