An optical trapping scheme is proposed by which ultrashort low-amplitude radiations, co-propagating with a continuous train of temporal pulses in a hollow-core photonic crystal fiber filled with Raman-inactive noble gases, can be trapped and reshaped into optical soliton trains by means of cross-phase modulation interactions. The scheme complements and extends a recently proposed idea that a single-pulse soliton could trap an ultrashort small-amplitude radiation in a symmetric hollow-core photonic crystal fiber filled with a noble gas, thus preventing its dispersion [M. F. Saleh and F. Biancalana, Phys. Rev. A87, 043807 (2013)]. We find a family of three distinct soliton-train boundstates with different propagation constants, one being a duplicate of the trapping pulse train. We analyze the effects of self-steepening on the trapping (i.e. pump) and trapped (i.e. probe) field profiles and find that self-steepening causes a uniform shift in position of the pump soliton train, but a complex motion for the probe dominanted by anharmonic oscillations of their temporal positions and phases. The new trapping scheme is intended for optical applications involving optical-field cloning and duplication via wave-guided-wave processes, in photonic fiber media in which interplay time-division multiplexed high-intensity pulses coexisting with continuous-wave radiations.
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