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.
© 2006 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: November 1, 2005
Revised Manuscript: February 13, 2006
Manuscript Accepted: February 27, 2006
Tatsuya Sugita, Kouki Hirano, Tomiya Abe, and Yuzo Itoh, "Aberration properties in a chirped grating for coarse wavelength division demultiplexing," Appl. Opt. 45, 5597-5606 (2006)