Optical waveguides – With optical coupler – Particular coupling structure
Patent
1997-01-30
1998-06-23
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Particular coupling structure
385 31, 385 83, 385 11, G02B 626
Patent
active
057713243
ABSTRACT:
An optical fiber coupling assembly for substantially preserving polarization of transmitted optical radiation, including at least one multimode optical fiber situated in a housing that includes means for distributing pressure on the optical fiber and reducing stress on the multimode optical fiber. In one embodiment, the housing has a first and a second side, and includes a channel having a first end opening on the first side and a second end within the housing. A cavity connected to the second end of the channel is formed within the housing. An aperture formed in the housing connects the cavity to the second side. The channel, cavity, and aperture together provide a passageway for the optical fibers from the first side to the second side of the housing. In the preferred embodiment the aperture bundles a plurality of fibers together in an approximately circular cross-section. A laser such as a laser diode or laser diode array provides substantially polarized optical radiation that is coupled into a first end of the optical fibers. The optical radiation transmitted through the housing is outputted from the second side having substantially preserved polarization from the bundled second ends to provide a collective output beam having a substantially single polarization. The collective output beam is useful for pumping a solid state laser. The polarization preservation between the first and second ends may be greater than 70%, and in some embodiments greater than 90%.
REFERENCES:
patent: 4252407 (1981-02-01), Bubanko et al.
patent: 4688884 (1987-08-01), Scifres et al.
patent: 5081639 (1992-01-01), Snyder et al.
Laser Power Corporation
Palmer Phan T. H.
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