Dual-pump Raman amplification with increased flatness using modulation instability.
The application of modulation instability-initiated nonlinear broadening of two CW pumps at different wavelengths, in order to achieve superior gain ripple performance in broadband Raman amplifiers, is demonstrated for the first time experimentally. A particular example using Truewave and LEAF fibers is offered, in which the 0.1 dB gain ripple band is extended from 5 nm to 19 nm. Experimental results are in a good agreement with numerical modeling. Guidelines for optimal broadening are discussed.
Ellingham
T
T
Ania-Castañón
J
J
Turitsyn
S
S
Pustovskikh
A
A
Kobtsev
S
S
Fedoruk
M
M