Method and apparatus for optical isolation in high power fiber-optic systems
First Claim
Patent Images
1. An optical isolator, comprising:
- an input module including an input fiber, an input polarizer, and an input collimator;
a state of polarization rotator module; and
an output module including an output fiber having a facet, a beam expanding device, an output polarizer, and an output collimator, the beam expanding device configured to prevent damage to the facet of the output fiber due to back-reflected light in the output fiber.
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Abstract
Methods and apparatus for optical isolation in high peak power fiber-optic systems prevent damage to a facet within a fiber-optic isolator caused by back-reflected light from, for example, an optical amplifier. Preventing damage to the facet may include expanding a mode area of the back-reflected light and/or reducing a change in refractive index.
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Citations
32 Claims
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1. An optical isolator, comprising:
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an input module including an input fiber, an input polarizer, and an input collimator; a state of polarization rotator module; and an output module including an output fiber having a facet, a beam expanding device, an output polarizer, and an output collimator, the beam expanding device configured to prevent damage to the facet of the output fiber due to back-reflected light in the output fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 23)
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20. An optical isolator, comprising:
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an input module including an input fiber, an input polarizer, and an input collimator; a state of polarization rotator module; and an output module including a multimode output fiber, a beam expander, an output polarizer, and an output collimator, an index of refraction of the multimode output fiber being matched to an index of refraction of the beam expander. - View Dependent Claims (21, 22, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An optical isolator comprising:
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an input module including an input fiber; an output module including an output fiber having a facet within the optical isolator; and means for reducing damage to the facet of the output fiber caused by any back-reflected light received through the output fiber.
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Specification