We have developed a periodically poled LiNbO3 (PPLN) wavelength converter with a buried waveguide to improve a mode overlap between a fundamental light and a converted light. We formed a periodically poling by applying highvoltage and a buried waveguide by mechanical processes and a burying process. We designed quasi-phase-matching for second harmonic generation (SHG) in a telecommunication wavelength. We achieved a larger overlap between them in the PPLN buried waveguide than that in a ridge waveguide and confirmed improvement of the SHG conversion efficiency. We also demonstrated wavelength conversion based on cascaded SHG and difference frequency generation (DFG) in a single PPLN waveguide device for fiber-optic communication systems. Additionally, we found out a signal wavelength conversion bandwidth of the cascaded SHG and DFG covering most of C and L bands.
We demonstrate a polarization diversity optical parametric amplifier (OPA) by a periodically poled LiNbO3 (PPLN) module for fiber-optic communication systems. We have fabricated the PPLN module which consists of two parallel PPLN ridge waveguide devices to amplify orthogonal polarization components of a signal light independently. The dependence of the parametric gain of each PPLN waveguide on the pump light power was investigated based on a cascaded second harmonic generation (SHG) and OPA process. Both PPLN waveguides showed almost the same parametric gain property, which facilitated the gain equalization between the orthogonal polarization components of the signal light. We successfully performed the polarization-independent OPA by adjusting the quasi-phase-matching wavelengths and the gains of the two PPLN waveguides.
We have designed and developed a nonlinear-optic wavelength converter with periodically poled LiNbO3 (PPLN) waveguides for optical fiber communication systems. The wavelength conversion module comprises two parallel PPLN ridge waveguide devices for a polarization-independent operation. We demonstrate highly efficient wavelength conversions and amplifications based on a cascaded second harmonic generation (SHG) and difference frequency generation (DFG), and optical parametric amplifier (OPA). The wavelength conversion efficiencies and the signal gains more than 20 dB are achieved for both orthogonal transverse magnetic (TM) polarization and transverse electric (TE) polarization in the module.
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