Optical waveguides – With optical coupler – Input/output coupler
Patent
1998-05-26
2000-01-25
Palmer, Phan T. H.
Optical waveguides
With optical coupler
Input/output coupler
385 33, 385 43, 385 27, G02B 632
Patent
active
060186046
ABSTRACT:
This invention proposes the fabrication of a polarization-independent fiber optic (in-line) isolator based on a beam aperture method. A micro Grin lens and a small Grin lens are used. They function as the collimators for the forward-going and the backward-going beams from the input and output ends of the isolator, respectively. In addition, the small Grin lens also acts as a beam expander for the backward-going beam. Due to the different apertures of the collimated beams, the optical power of the forward-going beam is almost completely collected by the optical fiber at the output end, whereas only a very small percentage of the optical power of the backward-going beam is collected by the micro Grin lens and the attached input fiber. Because the beam is usually a Gaussian, placing the micro Grin lens at an off axis position will significantly enhance the isolation of the isolator. Two-stage isolators whose basic structure consists of two tandem single-stage isolators can also significantly enhance the isolation of the same.
REFERENCES:
patent: 4744620 (1988-05-01), Ueno et al.
patent: 5457759 (1995-10-01), Kalonji et al.
patent: 5699464 (1997-12-01), Marcuse et al.
Ja Laboratories, Inc.
Palmer Phan T. H.
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