Ultra-sensitive milliwatt peak power pulse characterization via wavelength conversion frequency resolved optical gating in optical fiber

摘要

Driven by the demands of high capacity optical communications systems, there has been much recent activity to develop sensitive intensity and phase characterization methods for pulses around 1.55 μm. As well as techniques such as second harmonic generation frequency-resolved optical gating (SHG-FROG), methods using sonogram analysis, time-resolved optical gating and pulse spectral analysis have also been reported. However, none of these existing techniques are sufficiently sensitive to characterize pulses with peak powers at the milliwatt level from realistic single-mode telecommunications sources. Here, we report a new FROG geometry using wavelength conversion in optical fiber which has been used to characterize 1 mW peak power, 20 Ps pulses from an unamplified semiconductor laser.