A 4‐GHz actively driven ultra‐low phase noise mode‐locked fibre laser

Abstract

Abstract This work demonstrates an actively driven ultra‐low phase noise mode‐locked laser built with all polarization‐maintaining components. The output of the laser is an optical pulse train at 4‐GHz repetition rate and 1.63‐ps pulse width. The absolute phase noise and timing jitter of the photo detected signal is measured and found to be –140 dBc/Hz at 10‐kHz offset frequency and 10.21 fs (integrated from 100 Hz to 10 MHz).

Keywords

• fibre lasers
• laser mode locking
• microwave photonics