Cascadable all-optical inverter based on a nonlinear vertical-cavity semiconductor optical amplifier.

Area of Science:

• Optoelectronics
• Semiconductor Devices
• Photonics

Background:

• All-optical signal processing is crucial for next-generation computing.
• Existing optical switches often require high switching powers or have limited speeds.
• Vertical-cavity semiconductor optical amplifiers (VCSOAs) offer potential for compact and efficient optical devices.

Purpose of the Study:

• To demonstrate the first cascadable, low-power, high-speed all-optical inverter.
• To investigate the use of VCSOAs as building blocks for all-optical logic circuits.
• To characterize the performance of the VCSOA-based all-optical inverter.

Main Methods:

• Utilizing cross-gain modulation and polarization gain anisotropy in a VCSOA.
• Leveraging the highly nonlinear gain characteristics of the electrically pumped VCSOA.
• Measuring the transfer characteristics and switching speed of the all-optical inverter.

Main Results:

• Achieved operation of a cascadable all-optical inverter with low optical switching power (~10 microW).
• Demonstrated a small device area (~100 microm(2)) and high-speed operation (80 ps fall time).
• Observed transfer characteristics similar to electronic inverters, with a high extinction ratio (~9.3 dB).

Conclusions:

• VCSOAs are suitable building blocks for high-performance all-optical logic and memory.
• The developed all-optical inverter exhibits favorable characteristics for optical computing applications.
• This work represents a significant advancement in the field of all-optical signal processing.