Open AccessDirect measurement of loop gain and bandwidth of phase-locked loop for mode-locked laser
Author(s) -
Dong Hou,
Jin Tian,
FanKo Sun,
Xianhe Huang
Publication year - 2016
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.24.017242
Subject(s) - bandwidth (computing) , phase locked loop , mode locking , loop (graph theory) , optics , loop gain , laser , physics , delay locked loop , control theory (sociology) , computer science , phase noise , telecommunications , mathematics , voltage , control (management) , combinatorics , quantum mechanics , artificial intelligence
A simple and robust technique for measuring the loop gain and bandwidth of a phase-locking loop (PLL) for mode-locked laser is proposed. This technique can be used for the real-time measurement of the PLL's real loop gain and bandwidth in a closed loop without breaking its locking state. The agreement of the experimental result and theoretical calculation proves the validity of the proposed technique for measuring the loop gain and bandwidth. This technique with a simple configuration can be easily expanded to other laser's locking system whose loop gain and bandwidth should be measured in advance.