Analysis of Raman assisted stokes and anti-stokes emission in silicon waveguide

• Main Author: Yu, Ya Xin.
• Other Authors: Shum Ping
• Format: Final Year Project
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio
• Online Access: http://hdl.handle.net/10356/39470
• Institution: Nanyang Technological University

Silicon photonics technology is a rapidly evolving research area today with promising impact in realizing low cost, high speed optoelectronic components for data and telecommunication applications. Recent development of silicon photonics has been hugely hindered by the lack of active components such as amplifier and wavelength converter. Raman processes such as stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) are proposed as the attractive solution to that. In this report, our main focus is on Raman assisted Stokes and anti-Stokes emission in silicon waveguide. In order to find out the optimal Stokes-to-anti-Stokes conversion efficiency for silicon waveguide, we proposed three types of device models, namely single wavelength converter, mono-directionally pumped combined device of amplifier and wavelength converter and bi-directionally pumped combined device of amplifier and wavelength converter. And according to our amplitude propagation model (APM) applied in this research work, there are seven main parameters may affect the output: (1) phase mismatch factor, (2) pump power, (3) Stokes probe power, (4) cavity length, (5) absorption coefficient, (6) two photon absorption (TPA) coefficient, and (7) effective free carrier recombination time. Intensive numerical simulations were conducted on the proposed models. Analysis of the relationships between Stokes-to-anti-Stokes conversion efficiency/anti-Stokes-to-Stokes output ratio and the seven influencing parameters for wavelength converter model were also discussed in detail. In the end, we conclude that a mono-directionally pumped combined device of amplifier and wavelength converter can give the best Stokes-to-anti-Stokes conversion efficiency compared with the other models and the optimal configurations for single wavelength converter model and mono-directionally pumped combined device model are also obtained.