Patent ID: 6424420
Filing Date: 2002-07-23
Classification: G01D

Abstract:
A measuring device for an arrayed-waveguide diffraction grating provided with a first light source; a first optical path, onto which light radiated from said first light source is introduced and on which the arrayed-waveguide diffraction grating to be measured is disposed; a second optical path, on which an optical path length varying means is disposed; and an interference means for causing interference in light that has passed through said first optical path and said second optical path; said measuring device for an arrayed-waveguide diffraction grating being characterized in the provision of:a second light source; a first multiplexing means for multiplexing light radiated from said second light source to a stage preceding said optical path length varying means; a demultiplexing means provided to a stage proceeding said optical path length varying means, for multiplexing said second light source coupled to said second optical path; an attenuating means for attenuating light radiated from said second light source by a specific amount; and a second multiplexing means for multiplexing light radiated from said demultiplexing means and said attenuating means.