Presentation Information
[B-10B-02]Forward Raman Amplifier with Incoherent Pumping for Suppressed Launch Power
◎Shunya Hayashi1, Daichi Ogata1, Shigehiro Takasaka1, Michihiro Nakanishi1, Junji Yoshida1, Ryuichi Sugizaki1 (1. Furukawa Electric Co., Ltd.)
Keywords:
Incoherent Pumping,Forward Raman,Distributed Raman Amplifier,Long-Haul Transmission
This study proposes a novel incoherently forward-pumped distributed Raman amplifier (DRA) to reduce total launch power in optical transmission systems and evaluates its performance. Conventional DRAs using incoherent pump sources (iPUMPs) suppress RIN transfer but require additional coherent pumps (cPUMPs) due to low output power, leading to total launch power exceeding 1 W in long-haul links.
To address this issue, iPUMP light is pre-amplified by a lumped Raman amplifier (LRA) before transmission. Two iPUMPs are multiplexed, amplified by an LRA with dispersion-compensating fiber and three cPUMPs, and transmitted with 32-channel C-band signals over 100 km fiber.
Results show comparable performance to the conventional scheme, achieving ~7.5 dB gain and ~1800 km reach, while reducing pump power by 52% (710 mW to 373 mW).
To address this issue, iPUMP light is pre-amplified by a lumped Raman amplifier (LRA) before transmission. Two iPUMPs are multiplexed, amplified by an LRA with dispersion-compensating fiber and three cPUMPs, and transmitted with 32-channel C-band signals over 100 km fiber.
Results show comparable performance to the conventional scheme, achieving ~7.5 dB gain and ~1800 km reach, while reducing pump power by 52% (710 mW to 373 mW).