Raman threshold and optical gain bandwidth in silica fibers

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2008
• Main Authors: Felinskyi, G.S., Korotkov, P.A.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2008
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/119070
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Raman threshold and optical gain bandwidth in silica fibers / G.S.Felinskyi, P.A.Korotkov // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2008. — Т. 11, № 4. — С. 360-363. — Бібліогр.: 8 назв. — англ.

Nonlinearity of the stimulated Raman scattering (SRS) process in single-mode
 fibers is the creation basis of the new class of modern photonic devices such as fiber
 Raman lasers and fiber Raman amplifiers. The quantitative analysis of the gain start
 conditions and the Raman laser threshold in the single mode fibers from the viewpoint of
 the strong gain description of active laser materials have been made in this work. It has
 been shown that the absolute transparency regime for optical transmission in fibers and
 Raman laser threshold for a monochrome signal wave can be directly obtained from the
 standard coupled equations using only fundamental fiber parameters. Limiting condition
 when material of fiber core starts transformation from the natural state with attenuation
 of the Stokes wave to the state in which the Stokes wave is amplified due to the pumping
 power may be expressed in a simple analytical form. The numerical data of laser
 threshold as a function of the wavelength and the examples of gain bandwidth
 determination for several widespread Raman fibers have been presented.