The present invention significantly improves the signal to noise ratio (SNR) in a passive optical array comprising sensors located in rungs between a distribution bus and a return bus. Erbium-doped optical fiber amplifiers are included in the buses proximate to each rung coupling to offset the coupler...http://www.google.com.au/patents/US6084233?utm_source=gb-gplus-sharePatent US6084233 - Optical sensor array having multiple rungs between distribution and return buses and having amplifiers in the buses to equalize return signals
Optical sensor array having multiple rungs between distribution and return ...
