Abstract
We have developed a high Raman gain fiber that is applicable to Raman amplification over a wide wavelength region. Since this fiber has sufficiently low OH-loss, favorable amplification characteristics for S-band are expected. Using 2 km of this fiber, an S-band discrete Raman amplifier of single stage configuration is fabricated with three laser diodes, and gain characteristics are investigated for 30 S-band WDM signals (1490-1512nm) with 100-GHz spacing. Amplifier input/output of-9.5dBm/+4.5dBm and-20dBm/-3.5dBm×30ch with 1-dB flatness without any gain-flattening filters are achieved by total 680mW pump power.
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