Title :
Analysis of the effects of time delay in clock recovery circuits based on phase-locked loops
Author :
Zibar, Darko ; Oxenlowe, Leif K. ; Clausen, Anders T. ; Mork, Jesper ; Jeppesen, P.
Author_Institution :
COM, Tech. Univ. Denmark, Lyngby, Denmark
Abstract :
Influence of time delay in a balanced optical phase-locked loops (OPLL) with a proportional integrator (Pl) filter is investigated using a delayed differential equation (DDE) is investigated. The limitations, which a time delay imposes on the Pl filter bandwidth, at increasing values of loop gain, are investigated by numerical simulations. Furthermore, simple expressions governing the stability properties of the loop, in the presence of time delay, are derived. For this purpose, three standard loop filters are considered: a Pl filter, a low pass (LP) filter and an active lag (AL) filter. The derived expressions are used to perform an optimisation in terms of the selected loop filters.
Keywords :
delay circuits; delays; differential equations; low-pass filters; optical fibre communication; optical filters; optical phase locked loops; synchronisation; Pl filter bandwidth; active lag filter; clock recovery circuits; delayed differential equation; loop gain; low pass filter; phase-locked loops; proportional integrator filter; standard loop filters; time delay; Active filters; Band pass filters; Circuits; Clocks; Delay effects; Differential equations; Integrated optics; Low pass filters; Optical filters; Phase locked loops;
Conference_Titel :
Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE
Print_ISBN :
0-7803-8557-8
DOI :
10.1109/LEOS.2004.1363238
