Theoretical analysis of power swapping in quadratic nonlinear medium

摘要

Nonlinear optical effects in quadratic nonlinear mediums for the traditional frequency conversionngenerally involve two or three incident optical waves and transfer the power of the input signalnwavelength to another new generated wavelength. The authors find that bidirectional powernswapping can be carried out by proper waveguide length and power arrangement when two signalsnand two continuous-wave pumps simultaneously take part in the quadratic nonlinear interactions.nTheoretical analyses referring to four incident optical waves are presented, taking into account thencascaded sum- and difference-frequency generation in a periodically poled lithium niobatenwaveguide. We apply such theory to ultrafast data information swapping and derive analyticalnsolutions clearly indicating the swapping condition. An example of bidirectional ultrafast dataninformation swapping is demonstrated. © 2010 American Institute of Physics.