Output-residual-driven adaptive narrowband feedforward method for suppressing power jitter in EDFA systems

Area of Science:

• Optical Engineering
• Telecommunications Systems
• Control Systems

Background:

• Optical power jitter in Erbium-Doped Fiber Amplifiers (EDFAs) degrades system performance.
• Existing methods struggle with dynamic operating-point transitions and narrowband disturbances.

Purpose of the Study:

• To propose and validate an output-residual-driven adaptive narrowband feedforward method for EDFA optical power jitter suppression.
• To enhance EDFA stability and performance during dynamic network events.

Main Methods:

• A hybrid control scheme combining a pump-based feedback loop for slow recovery and a Variable Optical Attenuator (VOA)-based feedforward branch for narrowband compensation.
• An event-triggered baseline estimation mechanism for generating a stable output reference.
• Power-domain I/Q demodulation and a secondary-path-aware I/Q-LMS algorithm for adaptive VOA coefficient correction.

Main Results:

• Significant reduction in output ripple and suppression of target-frequency residuals.
• Maintenance of desired amplifier gain following add/drop-induced operating-point transitions.
• Demonstrated robustness across various conditions including frequency variation, secondary-path mismatch, and cascaded amplification.

Conclusions:

• The proposed output-residual-driven adaptive narrowband feedforward method effectively suppresses optical power jitter in EDFA systems.
• The strategy exhibits robustness and broad applicability for maintaining stable EDFA performance in dynamic optical networks.