Novel concepts in 14XX-nm pump lasers for Raman amplifiers

Junji Yoshida; Naoki Tsukiji; Toshio Kimura; Masaki Funabashi; Toru Fukushima

doi:10.1117/12.475527

11 July 2002 Novel concepts in 14XX-nm pump lasers for Raman amplifiers

Junji Yoshida, Naoki Tsukiji, Toshio Kimura, Masaki Funabashi, Toru Fukushima

Proceedings Volume 4870, Active and Passive Optical Components for WDM Communications II; (2002) https://doi.org/10.1117/12.475527
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States

Abstract

The requirements for 14XX nm pumps with wavelength range from 1400 to 1520 nm are not only higher output power but also lower degree of polarization (DOP) for preventing the problem due to the polarization-dependent-gain in Raman amplifier. It is expected that co-propagating Raman pumping could improve system performances in comparison with using only counter pumping. To apply this scheme, the pump lasers should have enough low relative intensity noise (RIN) characteristics. In this paper, we will describe two novel concepts in 14XXnm pumps for Raman amplifiers from above requirements. One is a low DOP-laser-module with ultra high optical output, achieving just one beam output with two-orthogonal polarization already scrambled from a SMF pigtail on a single package. The scrambled optical outputs is as high as over 1W and has DOP as low as 5% over the range of operating current. The other is an ultra low noise and wavelength stabilized laser with integrated partial grating in the laser cavity, that is, eliminating an external fiber-Bragg-grating. The laser showed low noise characteristics less than -150dB/Hz of RIN and the stabilized multi-longitudinal-mode oscillation. We also investigated the advantage of this laser in reduction or suppression of the stimulated-Brillouin-scattering induced by pump.

Citation Download Citation

Junji Yoshida, Naoki Tsukiji, Toshio Kimura, Masaki Funabashi, and Toru Fukushima "Novel concepts in 14XX-nm pump lasers for Raman amplifiers", Proc. SPIE 4870, Active and Passive Optical Components for WDM Communications II, (11 July 2002); https://doi.org/10.1117/12.475527

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