All-fiber Time-Delay Spectrometer for simultaneous spectral and temporal laser pulse characterization in the nanosecond range

We have realized a modified Time-Delay Spectrometer (TDS) based on a step-chirped fiber Bragg grating (FBG) array. This novel method allows simultaneous spectral and temporal characterization of pulsed light sources in the nanosecond (ns) regime which can also be applied to the investigation of single pulses. With a spectral resolution in the 100 picometer range, pulse spectrograms are measured and exemplarily used to explore the emission behavior of a wavelength-stabilized laser diode directly modulated in the ns range.