Title :
High-resolution OFDR with incorporated fiber-optic frequency encoder
Author :
Takada, Kazumasa
Author_Institution :
NTT Opto-electron. Lab., Ibaraki, Japan
Abstract :
A high-resolution optical frequency-domain reflectometer (OFDR) which employs the frequency sampling method is reported. The auxiliary interferometer for generating the clock pulses at equally spaced light frequencies is incorporated into the main interferometer to simplify the system configuration and to reduce the effect of different environmental perturbations occurring at the two interferometers. 180-MHz frequency sampling is shown to give an 850- mu m spatial resolution and -80-dB minimum detectable reflectivity through the use of a DFB-LD with 180-GHz nonlinear chirp.<>
Keywords :
encoding; light interferometers; optical fibre testing; reflectometers; DFB-LD; auxiliary interferometer; clock pulses; environmental perturbations; fiber-optic frequency encoder; frequency sampling method; high-resolution optical frequency-domain reflectometer; minimum detectable reflectivity; nonlinear chirp; system configuration; Chirp; Clocks; Fiber nonlinear optics; Frequency; Nonlinear optics; Optical interferometry; Optical pulse generation; Reflectivity; Sampling methods; Spatial resolution;
Journal_Title :
Photonics Technology Letters, IEEE
