Supercontinuum generation enhanced by conventional Raman amplification at pumping by nanosecond pulses from a directly modulated DFB laser

Roberto Rojas-Laguna; Jaime Gutiérrez-Gutiérrez; Evgeny A. Kuzin; Baldemar Ibarra-Escamilla; Sergio Mendoza-Vázquez; Julián Moisés Estudillo-Ayala; Joseph W. Haus

doi:10.1117/12.698782

14 February 2007 Supercontinuum generation enhanced by conventional Raman amplification at pumping by nanosecond pulses from a directly modulated DFB laser

Roberto Rojas-Laguna, Jaime Gutiérrez-Gutiérrez, Evgeny A. Kuzin, Baldemar Ibarra-Escamilla, Sergio Mendoza-Vázquez, Julián Moisés Estudillo-Ayala, Joseph W. Haus

Author Affiliations +

Proceedings Volume 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI; 645516 (2007) https://doi.org/10.1117/12.698782
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

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.

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Roberto Rojas-Laguna, Jaime Gutiérrez-Gutiérrez, Evgeny A. Kuzin, Baldemar Ibarra-Escamilla, Sergio Mendoza-Vázquez, Julián Moisés Estudillo-Ayala, and Joseph W. Haus "Supercontinuum generation enhanced by conventional Raman amplification at pumping by nanosecond pulses from a directly modulated DFB laser", Proc. SPIE 6455, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VI, 645516 (14 February 2007); https://doi.org/10.1117/12.698782

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