Suppression of noise induced by group velocity matching of signal and forward pump light in a distributed Raman amplifier
Year: 2026
Type: article
Abstract: In the distributed Raman amplifier system with forward (Fwd) pumping, significantly large optical noise is induced when the group velocities of the pump and signal lights become close. In this paper, we show that this noise can be reduced by utilizing our previously proposed low-noise Fwd-pump unit. The results of a QAM signal transmission experiment conducted when group velocities were close demonstrate that the signal quality was improved when our Fwd-pump unit was used, while the signal quality was drastically degraded when using a conventional Fwd-pump unit.
Source: Optics Express
DOI: 10.1364/oe.586832
Institution: NTT (Japan)
Language: English
Topic: Optical Network Technologies
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7128479359