OPTICAL TRANSMISSION LINK INCLUDING RAMAN AMPLIFIER

摘要

An optical transmission system that employs a Raman amplifier including a Raman pump for introducing depolarize pump light into the fiber. The pump includes an optic al source generating a polarized optical pump signal, an optical sputter that splits the pump signa l into a first pump portion and a second pump portion, and a beam combiner that combines the first pump portio n and the second pump portion into the depolarized pump light. Further, the pump includes a delay device, such as a length of fiber, that causes the first pump portion to propagate farther from the beam sputter to the beam combines than the second pump portion. The length of fiber is longer than the coheren ce length of the pump signal.