| 摘要 |
PROBLEM TO BE SOLVED: To realize an apparatus for optical branching/insertion with a small loss which can freely select a light having arbitrary wavelength from a wavelength multiplexed light signal and can drop it, without requiring the replacement or the extension/diminution of a light reflection device such as a Bragg reflection filter, even when an ad/drop wavelength (particularly drop wavelength) are changed. SOLUTION: The apparatus for optical branching/insertion is provided with a reflective wavelength variable type light reflection part 4 which can vary the reflective wavelength of inputted wavelength multiplexed light, an optical branching part 3 which takes out light reflected by the light reflection part 4 as branched light of wavelength multiplexed light, an optical insertion part 8 which adds light having a wavelength corresponding to the branched light to passing light without being reflected by the light reflection part 4 as inserted light, and a reflective wavelength control part 21a to control the reflective wavelength of the light reflection part 4 according to the wavelength subjected to the optical branching. |
