Title :
Phase-plane analysis of rational harmonic mode-locking in an erbium-doped fiber ring laser
Author :
Lai, Wenn Jing ; Shum, Ping ; Binh, Le Nguyen ; Karlsson, Magnus
Author_Institution :
Network Technol. Res. Centre, Nanyang Technol. Univ., Singapore, Singapore
fDate :
3/1/2005 12:00:00 AM
Abstract :
We investigate the system performance of rational harmonic mode-locking in an erbium-doped fiber ring laser using the phase-plane technique of the nonlinear control engineering. Contributions from harmonic distortion, a Gaussian-like modulating signal, and its duty cycle to the system behavior are studied. We also demonstrate 660× and 1230× repetition rate multiplications on a 100-MHz pulse train generated from an active harmonically mode-locked fiber ring laser, and we hence achieve 66- and 123-GHz pulse operations by using the above-mentioned technique. It has been found out that the maximum obtainable rational harmonic order is limited by the harmonic distortion of the system as well as the pulse width of the generated signal, which in turn is determined by the duty cycle of the modulating signal. Furthermore, the rational harmonic order increases the complexity of the pulse formation process and hence challenges its stability.
Keywords :
erbium; fibre lasers; laser mode locking; optical distortion; optical modulation; optical pulse generation; ring lasers; 100 MHz; 123 GHz; 66 GHz; Gaussian-like modulating signal; erbium-doped fiber ring laser; harmonic distortion; optical pulse generation; phase-plane analysis; rational harmonic mode-locking; Control engineering; Erbium-doped fiber lasers; Harmonic analysis; Harmonic distortion; Laser mode locking; Laser noise; Optical pulse generation; Pulse width modulation; Ring lasers; System performance; Frequency conversion; harmonic distortion; laser stability; mode-locked lasers; optical fiber lasers; optical pulse generation;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.2004.842310