Abstract
When pump and Stokes pulses copropagate in a fiber Raman laser (FRL), the weaker Stokes spectrum is severely broadened through pump-induced cross-phase modulation (XPM).1 Thus, in an FRL during Raman amplification, the pulse is chirped through XPM, and then the linear anomalous dispersion of a fiber can compress the pulse. We first studied the output characteristics of single fiber and two-stage FRLs operating in the anomalous group velocity dispersion (GVD) regime. The lasers are made from single-mode polarization preserving dispersion-shifted fibers and are synchronously pumped by ~10-ps pulses from a TI°(1);KCI color center laser. To separate and better understand the amplification and compression, we used two different dispersion-shifted fibers in a two-stage configuration; the laser was tuned so that amplification occurred under normal GVD, while compression occurred under anomalous GVD. In this latter configuration we find that a steady-state pulse width is not achieved throughout the laser, and we also observe the soliton self-frequency shift.2 The strong XPM in an FRL favors the production of subpicosecond pulses, usually accompanied by a broad pedestal. Nevertheless, in special conditions, nearly pedestal-free (subpicosecond) pulses can be produced, even in the presence of XPM. We demonstrate such production in a two-stage FRL operating entirely in the anomalous GVD regime.
© 1987 Optical Society of America
PDF ArticleMore Like This
Roger Stolen
FTh3H.1 Frontiers in Optics (FiO) 2015
A. S. Gouveia-Neto, A. S. L. Gomes, and J. R. Taylor
TUV6 OSA Annual Meeting (FIO) 1987
Mohammed N. Islam, L. F. Mollenauer, R. H. Stolen, J. R. Simpson, and H. T. Shang
THD7 OSA Annual Meeting (FIO) 1987