Ultra high precision MZM bias controller on Q point
Annex
Rofea's modulator bias controller is specially designed for Mach-Zehnder modulators to ensure a stable operation state in various operating environments. Based on its entirely digitized signal processing method, the controller can provide ultra-stable performance.
The controller injects a low frequency, low amplitude dither signal, and a bias voltage into the modulator. It keeps reading the modulator's output and determines the condition of the bias voltage and related error. A