Patent ID: 7058268
Filing Date: 2006-06-06
Classification: G02B,H04B

Abstract:
1. An optical cable comprising: at least one first direction transmission line for transmitting an optical signal in a first direction along said cable, said first direction transmission line being made from a first type of unitary fiber; at least one second direction transmission line for transmitting an optical signal in a second direction along said cable, said second direction transmission line being made from a second type of unitary fiber, wherein said second type of unitary fiber is different from said first type of unitary fiber; wherein each of said unitary fibers has a main transmission section plus a leading length extension and a trailing length extension on either end of said main transmission section, wherein said main transmission section includes a combination of P-type fibers and N-type fibers arranged according to transmission direction, wherein said leading length extension and a first fiber in said main transmission section are in the same constituent fiber and wherein said trailing length extension and a last fiber in said main transmission section are in the same constituent fiber, and wherein said leading length extension and said trailing length extension in each of said unitary fibers are different fiber types; and wherein said leading length extensions in said first direction transmission line and said second direction transmission line have substantially the same length, and wherein said trailing length extensions in said first direction transmission line and said second direction transmission line have substantially the same length.