In a recirculating 42-km fiber loop with round-trip loss compensated by Raman gain, we have used excess gain to study the influence of adiabatic energy changes on the propagation of soliton pulses over fiber paths of hundreds to thousands of kilometers. Both the measured pulse shapes and the corresponding optical spectra vary in agreement with simple scaling laws and maintain the expected time-bandwidth product.
© 1989 Optical Society of America
K. Smith and L. F. Mollenauer, "Experimental observation of adiabatic compression and expansion of soliton pulses over long fiber paths," Opt. Lett. 14, 751-753 (1989)