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

Viasnoff-Schwoob, E.; Weisbuch, C.; Benisty, H.; Cuisin, C.; Derouin, E.; Drisse, O.; Duan, G-H.; Legou├ęzigou, L.; Legou├ęzigou, O.; Pommereau, F.; Golka, S.; Heidrich, H.; Hensel, H. J.; Janiak, K.
March 2005
Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p101107
Academic Journal
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.


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