Ultrahigh-speed all-optical half adder based on four-wave mixing in semiconductor optical amplifier

Area of Science:

• Optoelectronics
• Nonlinear Optics
• Optical Computing

Background:

• All-optical signal processing is crucial for future high-speed networks.
• Semiconductor optical amplifiers (SOAs) offer a compact platform for nonlinear optical effects.
• Pattern effects in optical adders limit their operational speed and reliability.

Purpose of the Study:

• To propose a novel scheme for an ultrahigh-speed all-optical half adder.
• To investigate the use of four-wave mixing (FWM) in SOAs for optical logic operations.
• To eliminate pattern effects using polarization-shift-keying (PolSK) modulation.

Main Methods:

• Utilized four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs).
• Employed polarization-shift-keying (PolSK) modulation format to avoid pattern effects.
• Performed numerical simulations using a broad-band model of the all-optical half adder.

Main Results:

• Demonstrated an ultrahigh-speed all-optical half adder scheme.
• Successfully eliminated pattern effects through PolSK modulation.
• Investigated the dependence of logic "1" output power on operating conditions (input powers, current, wavelength).

Conclusions:

• The proposed all-optical half adder scheme is effective for ultrahigh-speed operation.
• PolSK modulation is a viable solution for mitigating pattern effects in all-optical logic.
• Detailed analysis provides insights into optimizing SOA-based all-optical half adders.