Optical waveguides – With optical coupler – Input/output coupler
Patent
1989-12-26
1991-09-17
Sikes, William L.
Optical waveguides
With optical coupler
Input/output coupler
G02B 634
Patent
active
050489135
ABSTRACT:
An optical waveguide mode discrimination light filtering arrangement inclues an optical waveguide having an elongated multimode core, and a cladding that guides at least two modes of light of a given frequency in an elongated path along a longitudinal axis of said core. At least one grating region is embedded in the core at a location remote from the end portions of the core and has a multitude of grating elements extending with a substantially equal longitudinal spacing substantially normal to the longitudinal axis to reflect light propagating in the path and reaching the grating elements back into the path for longitudinal propagation therein opposite to the original propagation direction. The spacing of the grating elements is so related to the axial wavelength of one of the modes that the reflected light of the one mode interferes constructively while the light of any other of the modes passes through the grating region in the original propagation direction substantially without attenuation.
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Glenn William H.
Meltz Gerald
Morey William W.
Ruzek Peter R.
Sikes William L.
United Technologies Corporation
Wise Robert E.
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