Engineering chromatic dispersion and effective nonlinearity in a dual-slot waveguide

Area of Science:

• Photonics and Waveguide Engineering
• Nonlinear Optics

Background:

• Chromatic dispersion in silicon (Si) waveguides is a critical factor affecting optical signal integrity.
• Traditional Si rib waveguides often suffer from material dispersion limitations.
• Manipulating the mode effective area is key to controlling waveguide dispersion.

Purpose of the Study:

• To propose and analyze a new dual-slot waveguide structure with a rib-like design.
• To achieve flat and near-zero chromatic dispersion over an extended wavelength range.
• To enhance the nonlinear properties of silicon waveguides for broadband applications.

Main Methods:

• Utilizing a dual-slot waveguide design based on a rib-like structure.
• Analyzing chromatic dispersion, primarily focusing on waveguide dispersion by manipulating mode effective area.
• Investigating the nonlinear coefficient and effective mode area of the proposed waveguide.

Main Results:

• Demonstrated a flat and near-zero dispersion profile across a 198 nm bandwidth.
• Achieved a nonlinear coefficient of 1460/m/W at 1550 nm, 10 times greater than standard Si rib waveguides.
• Showcased the ability to tailor both dispersion and nonlinear coefficients by adjusting waveguide parameters.

Conclusions:

• The proposed dual-slot rib-like waveguide offers a promising solution for broadband optical signal systems.
• The design enables significant enhancement of nonlinear effects while maintaining uniform dispersion.
• This technology holds potential for next-generation high-performance optical communication and signal processing systems.