Patent ID: 6233387
Filing Date: 2001-05-15
Classification: G02B

Abstract:
A pulse-reshaping optical fiber having a length, said pulse-reshaping fiber comprising:a core surrounded by a cladding layer, said core having a first end, a second end, a diameter, and a refractive index n.sub.c, said diameter of said core monotonically changing along the length of the pulse-reshaping fiber from said first end to said second end, said core defining a central region having a maximum refractive index n.sub.1 and a moat region disposed radially adjacent to said central region, said moat region having a minimum refractive index n.sub.2, said central region having a positive relative refractive index .DELTA..sub.1, and said moat region having a relative refractive index .DELTA..sub.2 not greater than -0.1%, where said relative refractive index .DELTA..sub.1 associated with said central region equals (n.sub.1.sup.2 -n.sub.c.sup.2)/2n.sub.1.sup.2, and said relative refractive index .DELTA..sub.2 of said moat region equals (n.sub.2.sup.2 -n.sub.c.sup.2)/2n.sub.2.sup.2.