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Intensity-tunable group delay using stimulated Raman scattering in silicon slow-light waveguides
Optics Express
|June 9, 2009
Summary
Stimulated Raman scattering in silicon waveguides enables pump light intensity to control signal group delay. Microresonators significantly enhance this effect, boosting group delay by 50%.
Area of Science:
- Photonics
- Nonlinear Optics
- Materials Science
Background:
- Stimulated Raman scattering (SRS) is a key nonlinear optical phenomenon.
- Silicon photonics offers a platform for integrated optical devices.
- Controlling light propagation, like group delay, is crucial for optical signal processing.
Purpose of the Study:
- To investigate the use of SRS in silicon waveguides for controlling group delay.
- To explore the potential of microresonators to enhance this control.
- To quantify the achievable changes in group delay.
Main Methods:
- Utilizing silicon waveguides to observe SRS.
- Employing a pump- சீgnals scheme to modulate the group delay of a weak signal.
- Integrating microresonators to enhance the nonlinear interaction.
Main Results:
- Demonstrated that SRS in silicon waveguides allows pump intensity to control signal group delay.
- Observed minimal group delay changes in straight waveguides.
- Achieved a 50% fractional increase in group delay using microresonator enhancement.
Conclusions:
- SRS is a viable mechanism for active group delay control in silicon photonics.
- Microresonator enhancement significantly boosts the effectiveness of SRS for group delay modulation.
- This technique holds promise for tunable delay lines and optical buffering.
