Patent ID: 7711271
Filing Date: 2010-05-04
Classification: H04B

Abstract:
1. A bidirectional optical transmission system comprising: an optical transmission path capable of transporting optical signals in a propagating direction and a counter-propagating direction; a wavelength multiplexer configured to combine an optical service channel signal and a Raman amplification signal; a first circulator coupled to the optical transmission path and the wavelength multiplexer, the first circulator configured to direct the combined optical service channel signal and Raman amplification signal into the optical transmission path in the counter-propagating direction, and further configured to direct the optical signal along the optical transmission path in the propagating direction; and a second circulator coupled to the optical transmission path, the second circulator configured to remove the combined optical service channel signal and Raman amplification signal from the optical transmission path, and further configured to direct the optical signal along the optical transmission path in the propagating direction.