All-optical buffer using nonlinear polarization rotation effect of gain-transparent semiconductor optical amplifier

Area of Science:

• Optoelectronics
• Optical Communications
• Semiconductor Devices

Background:

• All-optical buffers are crucial for managing data flow in high-speed optical networks.
• Existing buffer technologies face challenges with signal integrity and dynamic delay.
• Semiconductor optical amplifiers offer potential for optical signal processing and buffering.

Purpose of the Study:

• To propose and demonstrate a cascaded all-optical buffer with large dynamic delay.
• To investigate the performance of the buffer in terms of pulse distortion, pattern effect, and noise accumulation.
• To achieve long data packet storage times for optical buffering applications.

Main Methods:

• Utilizing polarization rotation in a gain-transparent semiconductor optical amplifier for buffering.
• Implementing a cascaded buffer design with multiple buffering units.
• Conducting analysis and experimental validation of the proposed scheme.

Main Results:

• Successfully demonstrated an all-optical buffer with large dynamic delay.
• Achieved data packet storage for six round-trips, resulting in a delay of 33 μs.
• Confirmed effective improvement in pulse distortion and pattern effect.
• Showed effective inhibition of amplified spontaneous emission noise accumulation.

Conclusions:

• The proposed cascaded all-optical buffer effectively stores data packets with significant delay.
• The demonstrated scheme overcomes key limitations of existing optical buffering solutions.
• This work provides a valuable reference for the development of advanced all-optical buffers.