Optimized wavelength conversion in silicon waveguides based on off-Raman-resonance operation

Yannick Lefevre; Nathalie Vermeulen; Christof Debaes; Hugo Thienpont

doi:10.1117/12.921862

8 May 2012 Optimized wavelength conversion in silicon waveguides based on off-Raman-resonance operation

Yannick Lefevre, Nathalie Vermeulen, Christof Debaes, Hugo Thienpont

Proceedings Volume 8434, Nonlinear Optics and Applications VI; 843408 (2012) https://doi.org/10.1117/12.921862
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

Starting from the propagation equations describing four-wave-mixing-basedwavelength conversion, we investigate how the conversion efficiency in silicon waveguides is influenced by the frequency difference between the pump and Stokes input waves. By means of numerical simulations we show that, by detuning this frequency difference slightly away from Raman resonance, the conversion efficiency does not necessarily decrease, but can even be more than doubled as compared to Raman-resonant operation. At the same time, other values of the frequency detuning that still remain well within the Raman linewidth can lead to a more than 10 dB decrease in efficiency. As such, we show that a high-resolution tuning of the frequency difference is not only necessary to obtain an optimal conversion efficiency, but also to avoid the detrimental efficiency decrease in case of an inadequate detuning. Finally, we discuss how the pump-Stokes frequency difference that is optimal for wavelength conversion varies with the length of the waveguide and with its dispersion characteristics.

Citation Download Citation

Yannick Lefevre, Nathalie Vermeulen, Christof Debaes, and Hugo Thienpont "Optimized wavelength conversion in silicon waveguides based on off-Raman-resonance operation", Proc. SPIE 8434, Nonlinear Optics and Applications VI, 843408 (8 May 2012); https://doi.org/10.1117/12.921862

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KEYWORDS

Raman spectroscopy

Waveguides

Dispersion

Silicon

Numerical simulations

Raman scattering

Wave propagation

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