Patent ID: 6947642
Filing Date: 2005-09-20
Classification: G02B,G02F,H04B

Abstract:
1. An optical waveguide device comprising: a single-mode optical resonator waveguide serving as an optical ring resonator; a single-mode optical input/output waveguide having a first end and a second end; input signal light being inputted into the input/output waveguide at the first end and output signal light being outputted from the input/output waveguide at the second end; the input/output waveguide being located close to the resonator waveguide in an area; a Mach-Zehnder interferometer formed in such a way as to include a part of the resonator waveguide as its first optical waveguide arm and a part of the input/output waveguide as its second optical waveguide arm in the area; and the interferometer having a first optical coupler for optically coupling the first waveguide arm and the second waveguide arm with an input-side part of the input/output waveguide and a remaining part of the resonator waveguide due to multiple-mode optical interference, and a second optical coupler for optically coupling the first waveguide arm and the second waveguide arm with an output-side part of the input/output waveguide and the remaining part of the resonator waveguide due to multiple-mode optical interference; wherein the resonator waveguide, the input/output waveguide, and the interferometer constitute a first optical resonator section; and wherein at least one additional optical resonator section having a same configuration as the first resonator section is additionally provided in such a way as to be connected in cascade to the first resonator section; and wherein a total length of the resonator waveguide is determined in such a way that an operable frequency is 25 GHz or greater.