Broadband Ultrashort Pulse Characterization Based on Lithium Niobate Waveguides(Invited)
The transverse frequency-resolved optical gating(T-FROG)method based on a thin-film lithium niobate waveguide platform was previously proved to enable the accurate,in situ,and full-parameter characterization of waveguided femtosecond pulses inside integrated circuits.Herein,we confirm that the T-FROG method can operate over broadband spectra(e.g.,150 nm),which are benefited by the broadband operation characteristic features of transverse second-harmonic generation.Experimental results indicate that this method exhibits high sensitivity and signal-to-noise ratio for measuring pulses of various wavelengths.Furthermore,the proposed approach is applied to measure unknown pulses generated from a photonic crystal fiber,and the result indicates its potential for characterizing complex pulses.
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