Related Experiment Video
Updated: Nov 14, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Phase-preserving NALM regenerator with lower input power by optimizing the nonreciprocal phase shifter
Abstract:
We propose a new nonlinear amplifying loop mirror (NALM)-based phase-preserving amplitude regenerator (so-called NP-NALM) by introducing a nonreciprocal phase shifter to further improve the regeneration performance. The theoretical model of the NP-NALM structure and the amplitude regeneration and phase-preserving conditions are presented. It is shown that the optimal working point power reduces with the increase of the nonreciprocal phase shift in the available range and the first working point power can be as low as 115 mW by optimizing the nonreciprocal phase shifter. We also investigate the cascaded NP-NALM transmission system for quadrature phase-shift keying signals with amplified spontaneous emission noise and the output error vector magnitude (EVM) can reduce to 23% from the EVM limit of 30%, corresponding to bit error ratio of 10-3 for the cascaded system without regeneration.
Related Concept Videos
Phase-lead and Phase-lag Controllers
Gain
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
Time and frequency -Domain Interpretation of Phase-lead Control
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
Time and frequency -Domain Interpretation of Phase-lag Control
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Power Factor Correction
Half wave rectifier

