Aberration properties in a chirped grating for coarse wavelength division demultiplexing |
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| Authors: | Sugita Tatsuya Hirano Kouki Abe Tomiya Itoh Yuzo |
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| Affiliation: | Materials Research Laboratory, Hitachi Ltd., 7-1-1 Omika-cho, Hitachi, Ibaraki 319-1292, Japan. tsugita@hrl.hitachi.co.jp |
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| Abstract: | We studied the imaging performance of a chirped grating for a demultiplexer designed for coarse wavelength division multiplexing using a wavefront aberration analysis and the ray tracing simulation. The demultiplexer was composed of a chirped grating, cylindrical lenses, and a waveguide. The best image point and the spot shape focused by the chirped grating were effectively calculated with the wavefront aberration. We applied the aberration analysis to design a waveguide to connect branched beams to photodetectors, and we confirmed the demultiplexing performance experimentally. |
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