Patent ID: 6970627

Claim:
A method for core alignment between optical components for adjusting relative positions between a first optical component and a second optical component, wherein amplification means is used for amplifying an output of a photodetector configured to detect light being emitted from said first optical component and introduced to said second optical component, and the method includes: an optical intensity distribution obtaining step of subjecting said first and second optical components relatively to reciprocal scanning by repeating one-dimensionally concerning one axis and obtaining one-dimensional optical intensity distribution concerning said one axis based on the output of said amplification means obtained in accordance with said reciprocal scanning; and a position adjusting step of moving a central position of said reciprocal scanning to a given direction adjusting the relative positions between said first and second optical components based on a change in said one-dimensional optical intensity distribution obtained in said optical intensity distribution obtaining step with movement of the central position of said reciprocal scanning.