Compact wavelength monitoring by lateral outcoupling in wedged photonic crystal multimode waveguides

作者：E. Viasnoff-Schwoob, C. Weisbuch, H. Benisty, C. Cuisin, E. Derouin, Olivier Drisse, G.-H. Duan, Lionel Legouezigou, O. Legouézigou, Frederic Pommereau, Sebastian Golka, Helmut Heidrich, H.‐J. Hensel, Klemens Janiak · 发表于：Applied Physics Letters · 年份：2005 · DOI：10.1063/1.1879105 · 被引用次数：43 · 研究领域：Photonic Crystals and Applications、Photonic and Optical Devices、Optical Network Technologies

A device concept for laterally extracting selected wavelengths from an optical signal traveling along a waveguide, for operation in metropolitan area networks, is presented. The signal on the fundamental mode of a multimode photonic crystal waveguide is coupled to a higher-order mode, at a center frequency that spatially depends on the slowly varying guide parameters. The device is compact, intrinsically fault tolerant, and can split any desired fraction of the signal for monitoring purpose. Characterizations by the internal light source technique validate the optical concept whereas an integrated device with four photodiodes qualifies its potential with respect to real-world applications.