Abstract
Dense wavelength-division-multiplexing (WDM) lightwave systems will require devices for accessing the individual wavelength channels of multiwavelength optical-fiber links. In this paper we describe and characterize fully a high-performance wavelength multiplexing/demultiplexing (mux/demux) device based on a fiber Mach-Zehnder interferometer with Bragg gratings in the interferometer arms. The gratings are formed by using photosensitivity,1 which is a proven flexible means for fabricating gratings in both optical fibers and silica-on-silicon planar optical waveguides. When spliced into a multiwavelength transmission line, the mux/demux device can be used to extract wavelength channel(s) from the transmission line and/or to add wavelength channel(s) to the transmission line. In particular, the device is capable of multiplexing and demultiplexing optical channels spaced 100 GHz apart (0.8nm spacing at 1550 nm). The device complements previously demonstrated all-fiber narrowband channel demultiplexing components.2,3
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