title: Segmented chirped grating for coarse wavelength division demultiplexing with multimode optical fibers.
abstract: A chirped grating segmented into partitions each having a constant blaze angle to use in a demultiplexer for coarse wavelength division multiplexing with multimode optical fibers is developed. Its designed configuration utilizes a resonance region to achieve high diffraction efficiency and large dispersion. The width, blaze angle, and diffraction order of each partition were optimized by vector diffraction analysis. The diffraction loss of the manufactured grating was less than 1.5 dB, and polarization-dependent loss was less than 0.6 dB within a wavelength width of at least 70 nm. It is confirmed that a demultiplexer with the developed chirped grating had a wide passband and low cross talk.
authors.affiliation: Materials Research Laboratory, Hitachi, Ltd. 7-1-1, Omika-cho, Hitachi, Ibaraki 319-1292, Japan. tatsuya.sugita.gs@hitachi.com
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Sugita
authors.forename: Kouki
authors.initials: K
authors.lastname: Hirano
authors.forename: Tomiya
authors.initials: T
authors.lastname: Abe
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Itoh