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Proceedings Paper

Cascaded second-order processes for frequency shifting in planar Ti:LiNbO3 waveguides
Author(s): Roberta Ramponi; Vera Russo; Marco Marangoni; Roberto Osellame; Gian Piero Banfi; Vittorio Degiorgio; Ilaria Cristiani; Luca Tartara
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Paper 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.

Paper Details

Date Published: 24 March 2000
PDF: 8 pages
Proc. SPIE 3936, Integrated Optics Devices IV, (24 March 2000); doi: 10.1117/12.379958
Show Author Affiliations
Roberta Ramponi, INFM/Politecnico di Milano and CEQSE-CNR (Italy)
Vera Russo, INFM/Politecnico di Milano and CEQSE-CNR (Italy)
Marco Marangoni, INFM/Politecnico di Milano and CEQSE-CNR (Italy)
Roberto Osellame, INFM/Politecnico di Milano and CEQSE-CNR (Italy)
Gian Piero Banfi, INFM/Univ. di Pavia (Italy)
Vittorio Degiorgio, INFM/Univ. di Pavia (Italy)
Ilaria Cristiani, INFM/Univ. di Pavia (Italy)
Luca Tartara, INFM/Univ. di Pavia (Italy)

Published in SPIE Proceedings Vol. 3936:
Integrated Optics Devices IV
Giancarlo C. Righini; Seppo Honkanen, Editor(s)

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