Abstract: This absorbant is of the type formed by superlattice constituted by a stack of films of two different semiconductor materials having gaps of different heights. Thus, a potential well is produced in each film corresponding to the semiconductor with the smallest gap and a potential barrier in each film corresponding to the semiconductor with the largest gap. This saturatable absorbant is characterized in that the films corresponding to the semiconductor with the smallest gap have a thickness, which can assume two values, one small and the other large.Application in optics to the production of mode locking lasers and all optical logic gates.

Abstract: A multiple fiber formation machine permits a simultaneous drawing of a plurality of N optical fibers and then a linear multifiber stranding. It comprises a first drawing assembly for a plurality of N fibers constituted by N regulatable preformed supports, a system of N fiber formation enclosures, a system for the simultaneous coating of N fibers, a plurality of N drawing or pulley capstans, and a fiber diameter measuring system. A second linear multifiber stranding assembly comprises a cable support supply system, positioning means for the N fibers from the first drawing assembly, a system of coating the support with its fibers and a cable reception drum.