Optical waveguides – Optical fiber waveguide with cladding – With graded index core or cladding
Reexamination Certificate
2008-04-01
2008-04-01
Font, Frank G. (Department: 2883)
Optical waveguides
Optical fiber waveguide with cladding
With graded index core or cladding
C385S011000, C385S037000, C385S123000, C385S125000, C385S127000
Reexamination Certificate
active
11646016
ABSTRACT:
A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit “splitting” between the resonant wavelengths supported by the TE and TM components of the LP1mmode and the resonant wavelength supported by the odd/even HE2mcomponents of the LP1mmode. Since only the TE and TM components are polarization dependent, by splitting and shifting the resonant wavelengths for these modes away from a system-desired wavelength(s) supported by the odd/even HE modes, a polarization insensitive microbend-induced fiber grating can be formed. A fiber core configuration including a central core region, trench and ring is formed to exhibit a large radial gradient in core refractive index profile, with a significantly steep transition between the ring index and the trench index, to provide the desired splitting between the (undesired, polarization sensitive) TE/TM modes and the HE mode.
REFERENCES:
patent: 5411566 (1995-05-01), Poole et al.
patent: 6130974 (2000-10-01), Rivoallan
patent: 7110651 (2006-09-01), Golowich et al.
Fitel USA Corp.
Font Frank G.
Hughes James P.
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