Patent ID: 6496613
Filing Date: 2002-12-17
Classification: G02B

Abstract:
A wavelength router comprising:two first waveguides, each having a plurality of input/output sections, a plurality of connecting sections, and a structure such that light entering from each of said input/output sections diffuses toward each of said connecting sections; a plurality of second waveguides; and optical path converters which guide light from said first waveguides to said second waveguides, or guide light from said second waveguides to said first waveguides; wherein: said connecting sections of one of said two first waveguides are interconnected to said connecting sections of the other of said two first waveguides, respectively, via said plurality of second waveguides, respectively; distances between said plurality of light input/output sections and said connecting sections of each first waveguide are different from each other; said optical path converters are disposed at said connecting sections; a length of a line connecting two adjacent optical path converters on each first waveguide is G.; a first optical path length between a first of the two adjacent optical path converters and a condensing point at one of said input/output sections is L; a second optical path length between a second of the two adjacent optical path converters and the condensing point is L plus dL; the two adjacent optical path converters are located such that an isosceles triangle is formed having: as one side the first optical path length; as another side a portion from the condensing point to a length L along the second optical path length; and a base of length g; an angle &PHgr; between the base of length g of the isosceles triangle and the line of length G connecting the two adjacent optical path converters is 75 to 90 degrees; and g equals G cos &PHgr;.