Open AccessImprovement of bandwidth of phase-locked loop for mode-locked laser with multiple-differentials-based loop filter
Author(s) -
Dong Hou
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.013460
Subject(s) - phase locked loop , bandwidth (computing) , optics , laser , mode locking , control theory (sociology) , offset (computer science) , physics , phase noise , computer science , telecommunications , control (management) , artificial intelligence , programming language
A scheme for improving the bandwidth of a phase-locked loop (PLL) for mode-locked laser is proposed. In the proposed scheme, a modified PLL with a multiple-differentials-based loop filter can be used to increases the upper limit bandwidth of the laser-based PLL. The mechanism of the bandwidth improvement is explained in detail, and the experimental results of a laser-based PLL with the proposed scheme show that the upper-limit bandwidth of the PLL has been increased about by one order at offset frequency from 3 kHz to 30 kHz. This scheme with the simple multiple-differential-based loop filter configuration can be easily used in another laser's phase locking system whose bandwidth should be improved.