Patent ID: 7983515

Claim:
An optical fiber polarizer for imparting a predetermined desired polarization to a light signal transmission of a predetermined at least one wavelength transmitted therethrough, comprising: a polarization maintaining optical fiber structure of a first diameter having a core and a cladding surrounding said core, having at least one core mode, and at least one cladding mode, and having a corresponding core propagation constant, and a corresponding cladding propagation constant, said optical fiber structure comprising at least one sequential polarizer element, each comprising: a diameter decrease transition fiber section of a first transition length, transitioning down from said first diameter to a second diameter, smaller than said first diameter; a diameter increase transition fiber section of a second transition length, transitioning up from said second diameter to said first diameter; and an elongated substantially uniform fiber section of a predetermined length and of said second diameter, positioned between said diameter decrease transition fiber section, and diameter increase transition fiber section, wherein said core and said cladding propagation constants, said first transition length, said second transition length, said predetermined length, and said second diameter, are selected and configured to first partially couple at least one core mode of said light signal of said predetermined at least one wavelength, to said at least one cladding mode, and then partially couple said coupled light signal back into at least one of said at least one core mode and at least one other cladding mode, and are further selected and configured to produce a constructive interference for one light polarization of the light signal, corresponding to the desired polarization, and to produce destructive interference for a polarization orthogonal to said desired polarization, to thereby impart a polarizing effect on said core mode light signal transmission at the least one wavelength transmitted therethrough.