Patent ID: 7127178

Claim:
An optical extending device for use in transmission of optical signals which comprise at least one sequence of periodic optical signals, said optical device comprising: a first fiber optic having a characteristic dimensional propagation coefficient equal to β 1 and adapted to be connected to a single mode second fiber optic having a length equal to L 0 and a characteristic dimensional propagation coefficient equal to β 0 wherein L P , the length of said first fiber optic is substantially equal to {[T 2 /π−L 0 *β 0 ]/β 1 }*{1−MOD(L 0 /{[T 2 /π−L 0 *β 0 ]/β 1 }} and the overall length of said first and second fiber optics is n·L P and wherein: n is an integer 1, 2, 3. . . , and is selected in accordance L 0 , the length of said single mode second fiber optic; T is a time period of the periodic optical signals; and MOD is the remainder obtained from dividing L 0 by {[T 2 /π−L 0 *β 0 ]/β 1 }.