Optical air-path isolator using a beam aperture method

Details Optical air-path isolator using a beam aperture method Optical air-path isolator using a beam aperture method

1998-06-01

1999-10-26

Epps, Georgia

Optical: systems and elements

Lens

With graded refractive index

359738, 359737, 359652, 372703, 385 31, 385 33, 385 35, G02B 300, G02B 900, G02B 626, G02B 632

Patent

active

059738510

ABSTRACT:
This invention proposes the fabrication of a polarization-independent air-path isolator based on a beam aperture method. The isolator includes a micro Grin lens (MGL) and three small Grin lenses (SGLs). These lenses focus and collimate the forward and backward beams from the input and output ends of the isolator. In addition, one of the small Grin lenses (SGLs) also acts as a beam expander for the backward beam. Due to the significant difference in widths between the forward and backward collimated beams, the optical power of the forward beam is almost completely collected by the output small Grin lens (SGL) at the output end, while only a very small percentage of the optical power of the backward beam is collected by the small Grin lens (SGL) at the input end. Since a laser beam, in general, has a Gaussian beam-intensity distribution, positioning the micro Grin lens (MGL) at an off axis position will significantly enhance the isolation characteristic of the isolator. Two-stage isolators whose basic structure includes two tandem single-stage isolators can also significantly enhance the isolation property of the isolator.

REFERENCES:
patent: 3827785 (1974-08-01), Matsushita et al.
patent: 5317655 (1994-05-01), Pan
patent: 5825950 (1998-10-01), Cheng
patent: 5850493 (1998-12-01), Cheng

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