Slow-light all-optical soliton diode based on tailored Bragg-grating structure.

Area of Science:

• Photonics and Nonlinear Optics
• Optical Devices
• Solid-State Physics

Background:

• Nonlinear optical devices are crucial for advanced optical signal processing.
• All-optical diodes offer functionalities like signal isolation and routing.
• Bragg gratings provide a versatile platform for manipulating light propagation.

Purpose of the Study:

• To propose and investigate an all-optical soliton diode (AOSD).
• To achieve nonreciprocal light transmission using a novel nonlinear Bragg grating structure.
• To explore the propagation characteristics of optical solitons within this structure.

Main Methods:

• A sandwich nonlinear Bragg-grating structure comprising chirped and uniform gratings was designed.
• Spatially asymmetric chirped Bragg gratings with optical nonlinearity were introduced to induce nonreciprocity.
• Picosecond Gaussian pulses were launched to analyze transmission ratios and soliton velocities.

Main Results:

• A high transmission ratio of up to 150 was achieved.
• Optical solitons were observed to propagate at velocities below 0.03c.
• Nonreciprocal light transmission was demonstrated through the engineered nonlinear Bragg grating.

Conclusions:

• The proposed all-optical soliton diode exhibits promising performance for optical signal control.
• The device leverages nonlinear Bragg gratings to achieve efficient and nonreciprocal soliton propagation.
• This work contributes to the development of advanced all-optical switching and routing components.