Optical parametric chirped pulse amplification (OPCPA) is a scheme that swaps the laser amplifier in CPA for an optical parametric amplifier, bringing the promise of greater single-pass gain ...

Abstract: We propose a distributed acoustic sensing technique that utilizes correlation analysis derived from short-chirped-pulse optical frequency-domain reflectometry (OFDR). The performance of the ...

And whether the pseudo-code sequence of direct sequence spread spectrum, or the chirp pulse of LFM spread, both has a certain distance measurement capability of speed. So, we can use spread spectrum ...