Optical fiber device for generating light pulses

Details Optical fiber device for generating light pulses Optical fiber device for generating light pulses

G - Physics

11

C

328/114

G11C 19/30 (2006.01) G02B 6/28 (2006.01) H01S 3/00 (2006.01) G01J 3/28 (2006.01)

Patent

CA 1303149

-26- ABSTRACT OF THE DISCLOSURE A device is provided for generating, from a single light pulse of brief duration, a train of synchronous light pulses each comprising at most one photon on average, comprising several optical paths (11, 12,...1n)each formed by at least one single mode optical fiber with zero dispersion in the form of a loop closed on itself by end to end connection of its ends by at least one connector (20); the number of loops is n if the number N of the photons in the initial pulse is greater than 102n; these loops are joined together two by two, following each other, by first directional optical coupling means (212, 223, ...2(n-1)n)having a relatively small optical coupling coefficient equal to about (1/N)1/(n+1); second directional optical coupling means (31, 3n)also having a relatively low optical coupling coefficient joining the first (11)and last (1n)loops with external optical paths (respectively 4 or 7; 5 or 8) respectively for the input of only a small part of the initial light pulse and for the output of the train of equidistant pulses formed at most of a single photon on average; the periods of rotation of the photons in the loops are equal to integral numbers, prime with respect to each other, of elementary periods T; and the periods of rotation of the photons in the loops are sufficiently small so that the photons remaining in the loops at the end of a sampling procedure do not form a background noise troublesome for the following sampling procedure.

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