Patent ID: 7496256
Filing Date: 2009-02-24
Classification: G02B

Abstract:
1. A diffraction grating comprising a first block, a second block, a third block and a fourth block, the first to fourth blocks being connected together, both ends of a series of the first to fourth blocks being occupied by the first block and the fourth block, respectively, (a) the first block including: a plurality of first input waveguides; a first star coupler connected to the first input waveguides; and a plurality of first output waveguides connected to the first star coupler; (b) the second block having a plurality of groove structures that are formed on a substrate and in each of which a holey fiber is embedded; (c) the third block including: a plurality of delay waveguides; and grooves that are provided instead of a part of the delay waveguides, each of which being filled with an organic material; and (d) the fourth block including: a plurality of second input waveguides; a second star coupler connected to the second input waveguides; and a plurality of second output waveguides connected to the second star coupler.