Patent ID: 7110647
Filing Date: 2006-09-19
Classification: C03B,G02B,Y02P

Abstract:
1. A polarization maintaining optical fiber, comprising: a core extending along a longitudinal axis, said core including a rare earth and a first index of refraction; a cladding disposed about said core and having a second index of refraction that is less than said first index of refraction, said cladding having a first thermal coefficient of expansion (TCE); a pair of longitudinally extending members, each of said members having a TCE that differs from said first TCE of said cladding, said pair being spaced apart by a distance d a second cladding disposed about said cladding, said second cladding having a third index of refraction that is less than said second index of refraction; said fiber having a fundamental mode having a mode field diameter (MFD), and wherein said core is a multimode core having a diameter d the numerical aperture of said core relative to said first cladding is less than or equal to 0.12; the ratio d said fiber provides a beat length of less than 3.5 mm at a wavelength of 633 nm.