We previously reported output power levels of 1 W for 14xx nm InGaAsP/InP single-mode pump Fabry-Perot (FP) lasers.1 More recently, we have demonstrated high power (P>400 mW) 1550 nm and 1310 nm distributed feedback (DFB) lasers.2,3 In this paper, we present the results on 14xx nm DFB lasers designed for operation in high performance Raman optical amplifiers. The main advantage of Raman amplifiers is their broad-bandwidth gain where the shape of the gain/wavelength band is determined by emission wavelengths of individual lasers comprising the pumping system. In order to combine the output of conventional Fabry-Perot pumping lasers of different wavelengths in a single fiber, their spectra should be first narrowed and stabilized using Fiber Bragg Grating (FBG) technique. The necessity to use Bragg grating fibers increases the overall cost of the pumping system, and prevents future monolithic integration of multiple pump lasers on a single chip. In contrast to conventional FP diode lasers, DFB lasers do not require FBG stabilization and have a potential for monolithic integration in a single chip/module. Another advantage of DFB lasers is the considerable reduction of low frequency noise that is especially important for co-pumping Raman amplifiers.

© 2002 Optical Society of America

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