Abstract: We have developed a fiber length stabilization system
(FLSS) for the photonic distribution of LO signals by using a digital
phase and frequency discriminator (DPFD). Compared with a conventional
analog double-balanced mixer (DBM) or a phase sensitive detector with an
XOR gate (PSD), the DPFD has wider linear discrimination range by more
than 1000 times, which enables cycle-slip-free FLSS. Moreover, it makes
possible to stabilize the length of the fiber that is longer than the
coherent length of the light source used in FLSS.
View a pdf version of ALMA Memo #511.
Last modified: 2005-01-27
alma-memos@nrao.edu