METHOD OF NOISE CANCELLATION IN AN UNPOLARIZED-LASER INSTRUMENT

摘要

A method of noise reduction in a system where polarization mode fluctuations contribute to the noise in a signal is provided. Specifically, a corrected signal is formed by adjusting the relative and overall intensity of the orthogonal polarization components of an unpolarized laser source at a first detector positioned at a first angle with respect to the laser beam axis (20) so that the first detector (80) has the same sensitivity to polarization as a second detector (80) positioned at a second angle with respect to the laser beam axis (20). This corrected signal is then subtracted (100) from the signal at the second detector which detects a desired signal.