Patent ID: 6229937
Filing Date: 2001-05-08
Classification: G02B,H04B,H04J

Abstract:
An optical transmission link for transmitting multiplexed optical signals comprising:a first circularly polarized single mode optical waveguide fiber having a beat length and an axial twist along its length wherein, the pitch of the axial twist is shorter than the beat length and the pitch is either right-handed or left-handed along the fiber length;a transmitter module, for generating optical signals, optically coupled to the first circularly polarized waveguide fiber to launch into the circularly polarized waveguide fiber a plurality of optical signals, wherein each optical signal has a unique wavelength;additional circularly polarized single mode optical waveguide fibers optically coupled end to end one to another in sequence, one of the additional circularly polarized fibers being optically coupled to the first circularly polarized waveguide fiber, wherein the additional circularly polarized waveguide fibers have respective beat lengths and axial twists along their respective lengths, wherein, the pitch of the axial twist is shorter than the beat length in each of the respective additional fibers and the pitch of each is either right-handed or left-handed along the fiber length;a receiver module, to receive the plurality of optical signals, optically coupled to the last circularly polarized waveguide fiber in the additional fiber sequence wherein, the signals are separated in accordance with their respective wavelengths.