Signal phase regeneration through multiple wave coherent addition enabled by hybrid optical phase squeezer

Area of Science:

• Optoelectronics
• Optical Communications
• Quantum Optics

Background:

• Optical phase quantization is crucial for advanced optical communication systems.
• Existing methods face challenges with phase-to-amplitude noise transfer during signal regeneration.
• Developing novel techniques for efficient and clean optical phase manipulation is essential.

Purpose of the Study:

• To introduce and evaluate the hybrid optical phase squeezer (HOPS) for multi-level optical phase quantization.
• To compare the performance of dual-wave and triple-wave schemes within the HOPS framework.
• To demonstrate HOPS's capability for phase regeneration with reduced noise.

Main Methods:

• Utilizing coherent addition of two (dual-wave) or three (triple-wave) optical waves.
• Exploiting optical parametric processes and electro-optic modulation for phase control.
• Implementing HOPS for phase regeneration of digital optical signals.

Main Results:

• The dual-wave HOPS scheme achieved a 3-fold phase-noise reduction for 24-Gb/s QPSK signals, with a minor increase in amplitude noise.
• The triple-wave HOPS scheme enabled phase regeneration of a 12-Gb/s BPSK signal.
• The triple-wave scheme successfully suppressed phase-to-amplitude noise transfer, a limitation of the dual-wave scheme.

Conclusions:

• HOPS is an effective method for multi-level optical phase quantization and signal regeneration.
• The triple-wave HOPS scheme provides superior phase regeneration by eliminating phase-to-amplitude noise transfer.
• HOPS demonstrates significant potential for enhancing the quality and reliability of optical communication signals.