Interference cancellation technique of optical AND gate receiver using optical thyristor

Area of Science:

• Optoelectronics
• Optical Communications
• Signal Processing

Background:

• Fiber-optic code division multiple access (FO-CDMA) systems face performance degradation due to interference from side-lobes and cross-correlation.
• Existing optical AND gate receivers struggle to mitigate these interference sources effectively.

Purpose of the Study:

• To demonstrate an interference cancellation technique for optical AND gate receivers in FO-CDMA systems.
• To evaluate the performance enhancement achieved by using an optical thyristor as an optical hard-limiter.

Main Methods:

• Fabrication of an optical thyristor device.
• Integration of the optical thyristor into an optical AND gate receiver architecture.
• Evaluation of the receiver's performance in excluding interference signals.

Main Results:

• The fabricated optical thyristor functions effectively as an optical hard-limiter.
• The optical AND gate receiver utilizing the optical thyristor successfully excludes the intensity of interference signals.
• Complete elimination of side-lobe and cross-correlation peaks was achieved for any two users.

Conclusions:

• The optical thyristor-based optical AND gate receiver significantly enhances FO-CDMA system performance.
• This technique effectively mitigates interference, enabling accommodation of a greater number of simultaneous users.
• The proposed method offers a viable solution for improving spectral efficiency in optical CDMA networks.