Raman Amplified Wavelength-Time Spectroscopy with Picometer Spectral Resolution and Single-Shot Detection

Wavelength-time spectroscopy (WTS) is a single-shot technique for sensing absorption spectra of bio-chemicals in real-time with an electronic digitizer, eliminating the need for conventional spectrometers. In this paper, we implement distributed Raman amplification in dispersion compensating fiber (DCF) to achieve an extraordinary -11.76 ns/nm "loss-less" dispersive element. By removing the loss-limitation in dispersive optical fiber, both high spectral resolution and single-shot measurements can be achieved simultaneously.