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This paper discusses an optical signal noise ratio (OSNR) in passive optical network (PON) using a distributed Raman amplifier (DRA). We focus on asymmetric OSNR properties for up/downstream signals in 10Gbps PON systems and study the dependency of OSNR on Raman pump power, splitting loss, and optical cable loss, theoretically. These calculations clarify the asymmetric OSNR properties mainly depend on the splitting loss. Calculated results are partly confirmed experimentally.

Asymmetric optical signal noise ratio in passive optical networks using Raman amplification