We propose nondegenerate four-wave mixing mirrorless oscillation in a multimode silicon nonlinear waveguide. Thanks to the large modal dispersion between two spatial modes caused by the high-index-contrast waveguide structure, two counterpropagating pumps of one spatial mode can generate two new optical waves of the other spatial mode at different frequencies. The phase-matching condition can be satisfied with the higher-order modes involved; therefore, frequencies of the newly generated light can be tuned by simply changing the pump frequency. The threshold power and conversion efficiency of the proposed mirrorless oscillation are investigated under different waveguide parameters.
© 2011 Optical Society of America
Original Manuscript: August 8, 2011
Revised Manuscript: September 14, 2011
Manuscript Accepted: September 17, 2011
Published: October 14, 2011
Yan Yan, Lin Zhang, and Alan Willner, "Nondegenerate mirrorless oscillation in silicon waveguide," Opt. Lett. 36, 4113-4115 (2011)