Patent ID: 7146079
Filing Date: 2006-12-05
Classification: H01S

Abstract:
1. A dynamic gain equalizer comprising: an optical waveguide circuit having a multistage optical demultiplexing coupler which is formed by connecting optical demultiplexing couplers arranged at a plurality of stages, a multistage optical multiplexing coupler formed by connecting optical multiplexing couplers arranged at a plurality of stages, and optical connecting circuits including optical phase shifters each capable of changing a phase of propagating light and optical delay lines each for adding a predetermined delay time to the propagating light, wherein each of at least one of the optical demultiplexing couplers in the multistage optical demultiplexing coupler and at least one of the optical multiplexing couplers in the multistage optical multiplexing coupler is provided with variable optical amplitude means, and the multistage optical demultiplexing coupler and the multistage optical multiplexing coupler are formed asymmetrically with respect to an extension of a line which connects a center arranged position of optical outputting ends of the multistage optical demultiplexing coupler with a center arranged position of optical inputting ends of the multistage optical multiplexing coupler.