title: Linear phase detection for a bimodal fiber sensor.
abstract: Interference between the LP(01) and LP(02) modes is used to measure fiber elongation. We present a passive phase-detection technique that uses a mask in the far field of the output beam and spatial filters in the image of the fiber end face, giving a linear response. Experimental results show a precision of about 3% of one period, which corresponds to a 4-microm elongation.
authors.forename: M
authors.initials: M
authors.lastname: Spajer