A proposal for two-input arbitrary Boolean logic gates using single semiconductor optical amplifier by picosecond...

Area of Science:

• Optoelectronics
• Optical Computing
• Semiconductor Devices

Background:

• Boolean logic operations are fundamental to digital computing.
• Implementing optical logic gates offers potential advantages in speed and bandwidth over electronic counterparts.
• Semiconductor optical amplifiers (SOAs) are key components in optical signal processing and amplification.

Purpose of the Study:

• To theoretically propose and analyze two-input arbitrary Boolean logic gates using a single SOA.
• To investigate the performance of optical logic gates in terms of power penalty, Q-factor, and extinction ratio.
• To demonstrate the feasibility of implementing various logic functions (NOR, OR, AND, XOR, XNOR, NAND) within a specific wavelength range.

Main Methods:

• Utilizing picosecond pulse injection to broaden the probe spectrum within the SOA.
• Employing four detuned optical Gaussian filters to select specific frequency components for logic operations.
• Combining logic channels to realize additional complex logic gates (XNOR, NAND).
• Characterizing gate performance through power penalty, Q-factor, and extinction ratio measurements.

Main Results:

• Successful theoretical demonstration of all six two-input arbitrary Boolean logic gates.
• Achieved Q-factor values greater than 6 for all implemented logic gates.
• Obtained extinction ratios exceeding 6.3 dB across a 16 nm wavelength range.
• Identified a large power penalty for the dark return-to-zero (RZ) output format.

Conclusions:

• A single SOA, assisted by optical filters, can effectively implement a range of two-input Boolean logic functions.
• The proposed scheme provides a viable approach for optical logic gate realization with acceptable performance metrics.
• Further optimization may be needed to mitigate power penalty issues associated with specific output formats.