OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING ELEMENT MANUFACTURING HOLOGRAM, OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING ELEMENT MANUFACTURING METHOD, OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING ELEMENT, MULTIPLEXING/DEMULTIPLEXING MODULE AND OPTICAL TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a method for easily manufacturing a small sized optical waveguide type diffraction grating element which is capable of selectively reflecting light having plural wavelengths and has a desired reflection characteristic or the like. SOLUTION: Mutually different K pieces (K>=2) of interference patterns having the cycleΛk (k=1 to K) are superposed and formed in the core region 111 of an optical fiber 110 existing in the side of a first surface 310 when a ultraviolet laser beam makes incident from the side of second surface 320 by an optical waveguide type diffraction grating element manufacturing hologram 300. In the optical waveguide type diffraction grating element manufacturing hologram 300, projecting and recessing parts of the cycle 2Λk of two times each cycleΛk of the refractive index modulation are superposed to form the first surface 310, and the distribution of the depth d of the projecting and recessing parts in the first surface 310 is expressed by a prescribed formula.