DIFFRACTION GRATING ELEMENT, MANUFACTURING METHOD OF THE SAME, OPTICAL COMMUNICATION SYSTEM INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method of easily manufacturing a diffraction grating element having a desired reflection characteristic.

SOLUTION: During a period in which an optical fiber (10) is irradiated with refractive index-variable induced light A via a phase grating mask (20), the phase grating mask (20) is relatively shifted with respect to the optical fiber (10) by a half distance corresponding to the grating period of the phase grating mask (20).

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