The predicted growth of broadband services, has led to extensive research for high capacity systems and networks. Current efforts are concentrated on the investigation of optical time-division multiplexing (OTDM) techniques combined with wavelength-division multiplexing (WDM) in order to fully utilize the potential of the installed fibers. All-optical switches, which can route a signal spatiall...

We investigate theoretically mid-infrared (MIR) generation via difference frequency in multimode AlGaAs-on insulator (AlGaAs-OI) waveguides. The large refractive index between the AlGaAs core and silica cladding shrinks modes size down to sub- ?m 2 scale, and, together with strong second-order nonlinear polarization, empowers effects. As a result, efficient MIR is obtained few-cm long waveguide...

We present a difference frequency generator (DFG) based on 2-mm-long MgO-doped aperiodically-poled lithium-niobate (APPLN) crystal with linearly-varying poling-period. The DFG was pumped by femtosecond fiber-laser system repetition-rate of 53.4 MHz. It produced broadband mid-infrared light source having an instantaneous-bandwidth covering 1.9–4.6 μm, average power 30 mW. Moreover, numerical sim...

We propose that high efficient terahertz (THz) multilayer structures are composed of ‎DSTMS/SiO2 and OH1/SiO2 at 3 and 6THz frequencies. We show that the efficiencies of these ‎structures are higher than DAST/SiO2 structure in both of 3 and 6THz frequencies. OH1/SiO2 ‎structure at 6THz has an efficiency as large as 10-1; at 3THz frequency, DSTMS/SiO2 structure ‎has an efficiency as large as 10-...

We report a continuous-wave (cw) source of tunable mid-infrared radiation providing tens of milliwatt of output power in the 6460-7517 nm spectral range. The source is based on difference-frequency generation (DFG) in orientation-patterned (OP)-GaAs pumped by a Tm-fiber laser at 2010 nm and a 1064 nm-Yb-fiber-pumped cw optical parametric oscillator. Using a 25.7-mm-long OP-GaAs crystal, we have...