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Novel structure of an arrayed‐waveguide grating multiplexer with flat spectral response

A novel structure of arrayed‐waveguide grating (AWG) multiplexers with a graded‐index free‐propagation region (FPR) used to increase the wavelength pass band is presented. The 1‐dB and 3‐dB wavelength pass bands increase with the increase of the graded‐index FPR length. Flat and broadened spectral responses are obtained by using this novel structure. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 444–445, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20165