1982/02/15 by Toshimitsu Musha, Jun-ichi Kamimura, Masataka Nakazawa · 1 citation
Physics and Astronomy · Engineering · #Advanced Fiber Laser Technologies #Semiconductor Lasers and Optical Devices #Photonic and Optical Devices
paper · doi:10.1364/ao.21.000694
Mathematical expressions have been derived on fluctuations of optical phase and frequency of a light wave which are thermally caused in a single-mode optical fiber in terms of fiber length, thermal coherence length, and fluctuation frequency. Fluctuations of optical phase and temperature were measured at a wavelength of 0.6328 microm by Mach-Zehnder interferometry, and the results are compared with theoretical predictions. A minimum detectable temperature change through optical phase shift depends on frequency stability of a source laser. It is 10(-5) K with a fractional frequency fluctuation of 10(-9).