Modulation of coupling in a photonic switch by resonant interference

Area of Science:

• Photonics
• Optical Engineering
• Waveguide Technology

Background:

• Photonic switches are crucial for optical communication networks.
• Controlling light coupling between waveguides is a key challenge.
• Existing methods often require complex structures or high energy consumption.

Purpose of the Study:

• To introduce a novel photonic switch structure.
• To demonstrate light coupling control using resonant interference.
• To explore the application of photo-optical and electro-optical techniques for switching.

Main Methods:

• Analytical approximations from coupled-mode theory were used to derive waveguide coupling equations.
• Beam-propagation simulations were employed to model the photonic switch.
• Results from analytical and simulation models were compared.

Main Results:

• A novel photonic switch structure based on resonant interference was successfully modeled.
• Light coupling between two fiber waveguides is effectively controlled by a third waveguide.
• Photo-optical (Kerr) and electro-optical (Pockels) techniques can modulate the refractive index for switching.
• Multiple resonant interferences were observed in slab waveguide configurations.

Conclusions:

• The proposed photonic switch structure offers a new method for optical switching.
• The design is versatile, allowing for fiber or slab waveguide configurations.
• The combination of coupled-mode theory and beam-propagation simulation validates the approach.