Generation of gigantic nanosecond pulses through Raman-Brillouin-Rayleigh cooperative process in single-mode optical fiber

Gautier Ravet; Andrei A. Fotiadi; Patrice Mégret; Michel Blondel

doi:10.1117/12.558571

3 May 2004 Generation of gigantic nanosecond pulses through Raman-Brillouin-Rayleigh cooperative process in single-mode optical fiber

Gautier Ravet, Andrei A. Fotiadi, Patrice Mégret, Michel Blondel

Author Affiliations +

Proceedings Volume 5480, Laser Optics 2003: Diode Lasers and Telecommunication Systems; (2004) https://doi.org/10.1117/12.558571
Event: Laser Optics 2003, 2003, St. Petersburg, Russian Federation

Abstract

We report a self-starting gigantic pulse generation observed during steady state stimulated Raman scattering (SRS) process in 10 km long telecom fiber. In our rather specific experimental configuration, the fiber was pumped by radiation from a 2.4 W continuous wave (CW) fiber laser source operating at 1455 nm. This pump provided the generation of light at Raman shifted wavelength around 1555 nm. At pumping face, the fiber was spliced with a broadband fiber loop mirror that reflected ~80% of Stokes power back into the fiber. Reflection from the far fiber end face was strongly prevented by the use of an optical isolator. The configuration provided ~30% power conversion from pump to Stokes radiation. Pulsations were observed from both ends of the fiber and occurred in rather stochastic manner with repetition rates in the range from hundreds kilohertz to several megahertz. Gigantic pulses with duration down to ~1 ns and peak power estimated to be above ~1 kW were recorded from the far fiber end. Smaller pulses with duration down to ~50 ns were observed from the pumping side of the fiber. Using a digital oscilloscope we investigated the fine structures of the pulses and determined some consistent patterns of their mutual dynamics. The RF spectrum measurements highlighted the stimulated Brillouin scattering that is suspected to be a main dynamical mechanism initiating pulsations. We observed also other different nonlinear effects caused by propagation of the intensive pulses through the fiber. Corresponding optical spectra were recorded and interpreted. Reported experimental data indicate that Rayleigh, Brillouin and Raman scatterings are all involved in the process of gigantic pulse generation in the fiber.

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Gautier Ravet, Andrei A. Fotiadi, Patrice Mégret, and Michel Blondel "Generation of gigantic nanosecond pulses through Raman-Brillouin-Rayleigh cooperative process in single-mode optical fiber", Proc. SPIE 5480, Laser Optics 2003: Diode Lasers and Telecommunication Systems, (3 May 2004); https://doi.org/10.1117/12.558571

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KEYWORDS

Raman spectroscopy

Fiber lasers

Mirrors

Raman scattering

Rayleigh scattering

Remote sensing

Single mode fibers

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