Abstract

In the context of supercontinuum generation in photonic crystal fibers an interesting phenomenon was experimentally observed recently [1]: Several solitons were severely Raman-shifted, but two of them maintained a near-constant separation, i.e. gave the appearance of a bound pair. This situation was recently investigated analytically [2-4]; it turns out that there is no binding force. Rather, it is predicted that actually two different types of such soliton pairs exist. The first type we call a ’rotating phase pair’; the result in [1] is identified as this kind. The other type, a ’constant phase pair’, was numerically found by Akhmediev et al.[5] many years ago.

© 2011 IEEE