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Proceedings Paper

Supercontinuum generation enhanced by conventional Raman amplification at pumping by nanosecond pulses from a directly modulated DFB laser
Author(s): Roberto Rojas-Laguna; Jaime Gutiérrez-Gutiérrez; Evgeny A. Kuzin; Baldemar Ibarra-Escamilla; Sergio Mendoza-Vázquez; Julián Moisés Estudillo-Ayala; Joseph W. Haus
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Paper Abstract

We investigated spectral broadening in a standard fiber using a nanosecond directly modulated DFB laser (&lgr;=1549 nm), amplified by a two stage Erbium-doped fiber amplifier. The amplifier provided amplification of 2-mW peak power input pulses to 100-W peak power output pulses. In other hand, the directly modulation of DFB lasers caused transient oscillations at the beginning of pulses. In our case pulses consisted of a 2-ns transient part followed by a steady-state plateau. We used a monochromator to measure the spectrum at the fiber output. A fast photodetector was placed at the monochromator output and pulse shapes were measured for different wavelengths. This technique allowed the separate measurement of different parts in output pulses spectrum. We used the SMF-28 fiber with the standard dispersion of 20 ps/nm-km for our wavelength. We made measurements of the output spectra for three fiber lengths: 0.6-km, 4.46-km and 9.15-km; finding that the initial transient part of a pulse shows supercontinuum generation whereas the plateau results in conventional Raman amplification of this supercontinuum.

Paper Details

Date Published: 14 February 2007
PDF: 7 pages
Proc. SPIE 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI, 645516 (14 February 2007); doi: 10.1117/12.698782
Show Author Affiliations
Roberto Rojas-Laguna, Univ. de Guanajuato (Mexico)
Jaime Gutiérrez-Gutiérrez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Evgeny A. Kuzin, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Baldemar Ibarra-Escamilla, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Sergio Mendoza-Vázquez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Julián Moisés Estudillo-Ayala, Univ. de Guanajuato (Mexico)
Joseph W. Haus, Univ. of Dayton (United States)


Published in SPIE Proceedings Vol. 6455:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI
Peter E. Powers, Editor(s)

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