Inventors:
Idan Mandelbaum - Piscataway NJ, US
Martin Achtenhagen - Bradley Beach NJ, US
Donald Zimmerman - Farmingdale NJ, US
Stephen Arleth - Farmingdale NJ, US
Kao Huang - Plainsboro NJ, US
Assignee:
JDS Uniphase Corporation - San Jose CA
International Classification:
H01S003/00
Abstract:
An apparatus for sensing changes, e.g. transient changes in the input or output signal spectrum of an optical amplifier, typically an EDFA, uses only a pair of spectrally banded photodiodes to equalize the transient behaviour of the amplifier. The photodiodes provide a control signal which is either sum or difference of signals generated by the photodiodes, that is used in the control of the optical amplifier in a feedback or feed-forward mode in order to counterbalance the effects of changes in the spectral content of the input (or output) signal of the optical amplifier.