Cascaded second-order processes for frequency shifting in planar Ti:LiNbO3 waveguides

Roberta Ramponi; Vera Russo; Marco Marangoni; Roberto Osellame; Gian Piero Banfi; Vittorio Degiorgio; Ilaria Cristiani; Luca Tartara

doi:10.1117/12.379958

24 March 2000 Cascaded second-order processes for frequency shifting in planar Ti:LiNbO₃ waveguides

Roberta Ramponi, Vera Russo, Marco Marangoni, Roberto Osellame, Gian Piero Banfi, Vittorio Degiorgio, Ilaria Cristiani, Luca Tartara

Author Affiliations +

Proceedings Volume 3936, Integrated Optics Devices IV; (2000) https://doi.org/10.1117/12.379958
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

Wavelength conversion is a key function in wavelength- division multiplexing. Frequency-shifting can be obtained through cascaded second-order nonlinear processes: a pump at (omega) is coupled into the waveguide, second harmonic is generated and made to interact with a coupled signal at (omega) -(Delta) (omega) so as to obtain a converted signal at (omega) + (Delta) (omega) via difference frequency generation. For practical applications, it is essential to achieve a good control in waveguide fabrication so as to be able to design a frequency-shifting device for specific pump and signal frequencies. In this work we report frequency- shifting based on cascaded second-order nonlinear processes obtained in simple planar Ti-undiffused LiBnO₃ waveguides, where phase-matching is achieved by birefringence. A Y-cut planar waveguide, 17mm long, was fabricated by diffusing a 290-angstrom-thick titanium layer for 6 hours at a temperature of 1000 degrees C. Thanks to a good modeling of the fabrication process, the waveguide behavior could be predicted directly from the fabrication parameters. A converted signal at 1.100 micrometers was obtained from a pump at 1.104 micrometers and a signal at 1.108 micrometers at a working temperature of 85 degrees C. The phenomenon was observed with a reasonable efficiency and was highly reproducible. The experimental results were in very good agreement with the expected ones.

Citation Download Citation

Roberta Ramponi, Vera Russo, Marco Marangoni, Roberto Osellame, Gian Piero Banfi, Vittorio Degiorgio, Ilaria Cristiani, and Luca Tartara "Cascaded second-order processes for frequency shifting in planar Ti:LiNbO₃ waveguides", Proc. SPIE 3936, Integrated Optics Devices IV, (24 March 2000); https://doi.org/10.1117/12.379958

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