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In this paper, we have studied the characteristics of second-order nonlinear interactions with band-overlapped type-I quasi-phase-matching (QPM) second harmonic generation (SHG) and sum-frequency generation (SFG), and predicted a blue-shift with a band-narrowing of their bands and a sunken response in the SFG curve, which are due to the phase-matching-dependent competition between band-overlapped...
We propose a novel scheme to achieve a tunable multiple wavelength conversion in an AOS waveguide structure. The full spectrum of input 1.57ps pulsed signals at 40Gbit/s can be converted to outputs at a relative-high and equalizing efficiency, which ensures high-bit-rate N*M broadcast wavelength conversion without pulse broadening and distortion.
Wavelength-tunable all optical delay of femtosecond laser pulse demonstrated theoretically through SHG and DFG quadratic nonlinear cascading interactions, in which group velocity of signal pulse can be controlled by pump beam.
We use the m-line spectroscopy technique to characterize the guiding modes in alkoxysilane dye (ASD) doped polymethyl methacrylate film waveguide. All-optical switching phenomenon with response time of ps was observed with improved prism-waveguide coupling.
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