Path-invariant fiber-based interferometric scanners for OCT

A path-invariant optical scanner linked with fiber-based Michelson interferometer was demonstrated for optical coherence tomography applications. The measured signal-to-noise ratio was determined to be 29.1. An orthogonal scanner implemented in the scanning interferometer was measured to have resonant frequency of 396 Hz and 36 μm displacement under applied bias of 32 V at frequencies below resonant frequency. The system functionality was also verified based on strong correlation in bias frequency and in comb displacement between signals inputted to comb-drive and interference signals, respectively.