Single mode propagation in fibers and rods with large leakage channels
First Claim
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1. An optical fiber for propagating at least one lower order mode having a wavelength λ
- , while limiting propagation of higher order modes having a wavelength λ
by providing said higher order modes with a higher loss than said at least one lower order mode at said wavelength λ
, said optical fiber comprising;
a first cladding region comprising a plurality of holes having a diameter, d, and a center-to-center spacing, Λ
, wherein the ratio d/Λ
is larger than 0.4 and less than 0.95; and
a core region surrounded by said first cladding region, said plurality of holes of the first cladding region providing confinement of said at least one lower order mode to the core region,wherein said core region has a width of at least 20 micrometers,wherein the ratio Λ
/λ
is greater than 15 and less than 500, andwherein said optical fiber is configured such that said at least one lower order mode has no more than 1.0 dB/m of loss at a bending radius of 30 centimeters.
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Abstract
Various embodiments include large cores fibers that can propagate few modes or a single mode while introducing loss to higher order modes. Some of these fibers are holey fibers that comprise cladding features such as air-holes. Additional embodiments described herein include holey rods. The rods and fibers may be used in many optical systems including optical amplification systems, lasers, short pulse generators, Q-switched lasers, etc. and may be used for example for micromachining.
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Citations
31 Claims
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1. An optical fiber for propagating at least one lower order mode having a wavelength λ
- , while limiting propagation of higher order modes having a wavelength λ
by providing said higher order modes with a higher loss than said at least one lower order mode at said wavelength λ
, said optical fiber comprising;a first cladding region comprising a plurality of holes having a diameter, d, and a center-to-center spacing, Λ
, wherein the ratio d/Λ
is larger than 0.4 and less than 0.95; anda core region surrounded by said first cladding region, said plurality of holes of the first cladding region providing confinement of said at least one lower order mode to the core region, wherein said core region has a width of at least 20 micrometers, wherein the ratio Λ
/λ
is greater than 15 and less than 500, andwherein said optical fiber is configured such that said at least one lower order mode has no more than 1.0 dB/m of loss at a bending radius of 30 centimeters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- , while limiting propagation of higher order modes having a wavelength λ
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27. An optical fiber for propagating at least one lower order mode having a wavelength λ
- , while limiting propagation of higher order modes having a wavelength λ
by providing said higher order modes with a higher loss than said at least one lower order mode at said wavelength λ
, said optical fiber comprising;a first cladding region comprising a plurality of holes having a diameter, d, and a center-to-center spacing, Λ
, wherein the ratio d/Λ
is larger than 0.4 and less than 0.95; anda core region surrounded by said first cladding region, said plurality of holes of the first cladding region providing confinement of said at least one lower order mode to the core region, wherein said core region has a width greater than about 20 micrometers and less than about 300 micrometers, wherein said plurality of holes are configured to form a partially enclosed region, said partially enclosed region having at least one opening therein formed by one or more spaces in said partially enclosed region, said plurality of holes having a maximum bridge width, a, said maximum bridge width in part determining the size of said one or more spaces in said partially enclosed region, wherein said maximum bridge width, a, and said diameter, d, have respective values that yield a ratio of a/λ
that is at least about 5 and less than about 100, and a ratio of d/λ
, that is at least about 10 and less than about 100. - View Dependent Claims (28, 29, 30, 31)
- , while limiting propagation of higher order modes having a wavelength λ
Specification