Nonlinear optical fibre method of its production and use thereof
First Claim
1. An optical fibre for transmitting light of at least one predetermined wavelength λ
- , the optical fibre having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising;
(a) a core region comprising a core material of refractive index nc; and
(b) a cladding region, said cladding region surrounding said core region and comprising low-index cladding features of refractive index n1 arranged in a background cladding material of refractive index nb;
said cladding region further comprising first inner cladding features of refractive index n1 and second inner cladding features of refractive index n2, where n2 is lower than nc, and n2 is higher than n1, andsaid first inner cladding features and said second inner cladding features are arranged proximal to said core region, andn2 is lower than nb.
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Abstract
An optical fiber having a longitudinal direction and a cross-section perpendicular thereto, said fiber in a cross-section comprising: (a) a core region (11) having a refractive index profile with a highest refractive index nc, and (b) a cladding region comprising cladding features (10) having a center-to-center spacing, Λ, and a diameter, d, of around 0.4Λ or larger, wherein nc, Λ and d are adapted such that the fiber exhibits zero dispersion wavelength of a fundamental mode in the wavelength range from 1530 nm to 1640 nm; a method of producing such a fiber; and use of such an optical fiber in e.g. an optical communication system, in an optical fiber laser, in an optical fiber amplifier, in an optical fiber Raman amplifier, in a dispersion compensator, in a dispersion and/or dispersion slope compensator.
248 Citations
36 Claims
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1. An optical fibre for transmitting light of at least one predetermined wavelength λ
- , the optical fibre having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising;
(a) a core region comprising a core material of refractive index nc; and (b) a cladding region, said cladding region surrounding said core region and comprising low-index cladding features of refractive index n1 arranged in a background cladding material of refractive index nb; said cladding region further comprising first inner cladding features of refractive index n1 and second inner cladding features of refractive index n2, where n2 is lower than nc, and n2 is higher than n1, and said first inner cladding features and said second inner cladding features are arranged proximal to said core region, and n2 is lower than nb. - 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, 35, 36)
- , the optical fibre having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising;
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26. A method of producing a microstructured optical fibre, the method comprising:
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(a) providing a preform by providing and arranging preform elements in a predetermined structure; at least one high-index rod to form a core region of the preform, and surrounding said high-index rod by first elements of capillary tubes and low-index rods to form an inner cladding region proximal to said at least one high-index rod, said capillary tubes and low-index rods providing first and second inner cladding features in a final fibre, and surrounding said at least one high-index rod, said first elements of capillary tubes and said low-index rods by outer elements of capillary tubes providing an outer part of the micro-structured cladding; and (b) consolidating said structure; and (c) drawing said preform to an optical fibre with pre-determined dimension under a controlled heat treatment. - View Dependent Claims (32)
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27. A method of guiding electromagnetic waves comprising providing an optical fibre with a core region comprising a core material of refractive index nc and a cladding region, said cladding region surrounding said core region and comprising low-index cladding features of refractive index n1 arranged in a background cladding material of refractive index nb, said cladding region further comprising first inner cladding features of refractive index n1 and second inner cladding features of refractive index n2, where n2 is lower than nc, and n2 is higher than n1, and said first inner cladding features and said second inner cladding features being arranged proximal to said core region, and with n2 being lower than nb;
- and feeding said optical fibre with electromagnetic waves having wavelength from 400 nm to 1.7 μ
m.
- and feeding said optical fibre with electromagnetic waves having wavelength from 400 nm to 1.7 μ
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28. An article comprising an optical fibre for transmitting light of at least one predetermined wavelength λ
- , the optical fibre having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising;
(a) a core region comprising a core material of refractive index nc; and (b) a cladding region surrounding said core region and comprising low-index cladding features of refractive index n1 arranged in a background cladding material of refractive index nb, said cladding region further comprising first inner cladding features of refractive index n1 and second inner cladding features of refractive index n2, wherein n2 is lower than nc, and n2 is higher than n1, said first inner cladding features and said second inner cladding features being arranged proximal to said core region, and n2 being lower than nb. - View Dependent Claims (29, 30, 31)
- , the optical fibre having a longitudinal direction and a cross-section perpendicular thereto, the optical fibre comprising;
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33. A method of producing a microstructured optical fibre, the method comprising:
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providing a preform by providing and arranging preform elements in a predetermined structure; at least one high-index rod to form a core region of the preform, and surrounding said high-index rod by first elements of capillary tubes and low-index rods to form an inner cladding region proximal to said at least one high-index rod, said capillary tubes and low-index rods providing first and second inner cladding features in a final fibre, and surrounding said at least one high-index rod, said first elements of capillary tubes and said low-index rods by outer elements of capillary tubes providing an outer part of the micro-structured cladding; and drawing said preform to a preform cane with predetermined dimension under a controlled heat treatment, followed by drawing said preform cane to an optical fibre with predetermined dimension under a controlled heat treatment.
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34. A method of producing a microstructured optical fibre, the method comprising:
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providing a preform by providing and arranging preform elements in a predetermined structure; at least one high-index rod to form a core region of the preform, and surrounding said high-index rod by first elements of capillary tubes and low-index rods to form an inner cladding region proximal to said at least one high-index rod, said capillary tubes and low-index rods providing first and second inner cladding features in a final fibre, and surrounding said at least one high-index rod, said first elements of capillary tubes and said low-index rods by outer elements of capillary tubes providing an outer part of the micro-structured cladding; and drawing said preform to an optical fibre with predetermined dimension under a controlled heat treatment.
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Specification