We developed a high-speed wavelength-swept laser prototype using Fourier domain mode locking (FDML) and a reflection wavelength measuring system that could rapidly measure a fiber Bragg grating (FBG). The prototype FDML laser incorporated a temperature-controlled optical tunable filter and had a sweep bandwidth of 40 nm in the 1.55 μm wavelength band. This system was able to perform high-speed wavelength sweeping with a sweep frequency of 50.7 kHz and had a temporal resolution of 9.9 μs, which was equivalent to half of the laser’s sweep cycle, due to the FDML laser’s bidirectional swept-wavelength. In this paper, we report on high-speed vibration measurements of several kHz by this system using FBGs.

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103232I (23 April 2017); doi: 10.1117/12.2263410

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)