Ultrafast all-optical NOR gate based on semiconductor optical amplifier and fiber delay interferometer

Area of Science:

• Photonics and Optical Engineering
• Optoelectronics
• Digital Communications

Background:

• All-optical logic gates are crucial for high-speed optical communication systems.
• Semiconductor optical amplifiers (SOAs) and fiber delay interferometers (FDIs) are key components in photonic integrated circuits.
• Achieving ultrafast and efficient optical logic operations remains a significant challenge.

Purpose of the Study:

• To demonstrate an ultrafast all-optical logic NOR gate.
• To investigate the performance of the NOR gate using SOA and FDI.
• To achieve high-speed optical data processing at 40Gb/s.

Main Methods:

• Utilizing a semiconductor optical amplifier (SOA) for signal amplification and switching.
• Employing a fiber delay interferometer (FDI) to create switching windows.
• Configuring the FDI with specific delay times and phase shifts for NOR operation.
• Testing the device with high-speed return-to-zero (RZ) input signals.

Main Results:

• Successful demonstration of a Boolean NOR operation at 40Gb/s.
• Achieved NOR operation with low control optical power.
• Formation of non-return-to-zero (NRZ) switching windows suitable for NOR logic.
• Identification and discussion of factors affecting NOR gate performance.

Conclusions:

• The presented SOA-FDI based all-optical NOR gate is a viable solution for high-speed optical processing.
• The device offers efficient optical logic with low power consumption.
• Further analysis of performance-degrading factors can lead to improved optical logic gate designs.