title: Note: improving spatial resolution of optical frequency-domain reflectometry against frequency tuning nonlinearity using non-uniform fast Fourier transform.
abstract: We propose using non-uniform FFT to minimize the degrading effect of frequency tuning nonlinearity of a tunable laser source (TLS) in an optical frequency-domain reflectometry (OFDR) system. We use an auxiliary interferometer to obtain the required instantaneous optical frequency of the TLS and successfully demonstrate 100 times enhancement in spatial resolution of OFDR with only a 20% increase in computation time. The corresponding measurement reflectivity sensitivity is better than -80 dB, sufficient to detect bending induced index changes in an optical fiber.
authors: College of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China.
authors: Zhenyang
authors: Z
authors: Ding
authors: Tiegen
authors: T
authors: Liu
authors: Zhuo
authors: Z
authors: Meng
authors: Kun
authors: K
authors: Liu
authors: Qinnan
authors: Q
authors: Chen
authors: Yang
authors: Y
authors: Du
authors: Dingjie
authors: D
authors: Li
authors: X Steve
authors: XS
authors: Yao