Quasi-phase-matching in an asymmetric quantum well waveguide using ion implantation induced intermixing

Summary form only given.The emerging use of wavelength routing in wavelength-division-multiplexed (WDM) optical communication networks brings the need for wavelength conversion. Difference frequency generation (DFG) has a number of advantages over other techniques that have been proposed, such as strict transparency, and little deterioration of the signal-to-noise ratio. However, it is necessary to use quasi-phase-matching (QPM) in a waveguide geometry to obtain conversion efficiencies sufficient for WDM applications. Second-harmonic generation (SHG) and DFG have similar susceptibilities when the signal and difference frequencies are almost equal, as is the case for WDM applications, hence a demonstration of SHG is relevant to WDM wavelength conversion. This paper presents what is, to our knowledge, the first demonstration of quasi-phase-matched second-harmonic generation (SHG) using periodic modulation of /spl chi//sub zzz//sup (2)/ induced by AlGaAs quantum well intermixing.