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Supercontinuum generation in varying dispersion and birefringent silicon waveguide
Optics Express
|November 6, 2019
Summary
Researchers enhanced supercontinuum signals using waveguide dispersion control. This method achieved significant signal amplitude enhancement and wavelength extension, crucial for telecommunications and medicine.
Area of Science:
- Integrated photonics
- Nonlinear optics
Background:
- Supercontinuum generation is vital for various applications.
- Controlling supercontinuum properties like amplitude and coherence is challenging, especially with long pulses.
Purpose of the Study:
- To explore waveguide dispersion engineering for enhanced supercontinuum generation.
- To achieve selective enhancement of supercontinuum signals with improved coherence and bandwidth.
Main Methods:
- Utilized cascaded and tapered waveguides with engineered dispersion profiles.
- Employed simultaneous pumping of quasi-transverse electric (TE) and quasi-transverse magnetic (TM) modes in asymmetric silicon waveguides.
- Investigated the effect of waveguide width tapering and dispersion variation.
Main Results:
- Achieved up to 16 dB signal enhancement in the telecom window and 100 nm wavelength extension using cascaded waveguides.
- Demonstrated flatter and more coherent supercontinuum with tapered waveguides and longer input pulses.
- Obtained selective signal generation by controlling dispersion for TE and TM modes in asymmetric silicon waveguides.
Conclusions:
- Waveguide dispersion engineering offers a flexible platform for supercontinuum control, surpassing optical fibers.
- The proposed methods enable targeted supercontinuum generation for diverse applications in medicine and telecommunications.
