Patent ID: 7738749
Filing Date: 2010-06-15
Classification: B82Y,G02B

Abstract:
1. A photonic crystal having a heterostructure, which is characterized in that it comprises: a) a first forbidden band zone and a second forbidden band zone, located adjacent to each other; b) a trunk waveguide obliquely crossing a boundary between the two forbidden band zones, which is designed so that a multiplexed/demultiplexed wavelength band constituting of a segment of a transmission wavelength band in the first forbidden band zone is excluded from a transmission wavelength band in the second forbidden band zone; and c) a branch waveguide extending from an intersection of the trunk waveguide and the aforementioned boundary into the first forbidden band zone and being designed so that its transmission wavelength band includes the aforementioned multiplexed/demultiplexed wavelength band.