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Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 25. Отображено 25.
24-03-2011 дата публикации

HIGHLY RARE-EARTH-DOPED OPTICAL FIBERS FOR FIBER LASERS AND AMPLIFIERS

Номер: US20110069723A1
Автор: Liang Dong, Martin E. Fermann, Hugh McKay, Libin Fu, Shigeru Suzuki
Принадлежит: IMRA AMERICA, INC.

Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber.

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Номер записи: 1
14-04-2011 дата публикации

WIDE BANDWIDTH, LOW LOSS PHOTONIC BANDGAP FIBERS

Номер: US20110085769A1
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu
Принадлежит: IMRA AMERICA, INC.

Various embodiments include photonic bandgap fibers (PBGF). Some PBGF embodiments have a hollow core (HC) and may have a square lattice (SQL). In various embodiments, SQL PBGF can have a cladding region including 2-10 layers of air-holes. In various embodiments, an HC SQL PBGF can be configured to provide a relative wavelength transmission window Δλ/λc larger than about 0.35 and a minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF can be a polarization maintaining fiber. Methods of fabricating PBGF are also disclosed along with some examples of fabricated fibers. Various applications of PBGF are also described.

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Номер записи: 2
30-07-2013 дата публикации

Highly rare-earth-doped optical fibers for fiber lasers and amplifiers

Номер: US0008498046B2
Автор: Liang Dong, Martin E. Fermann, Hugh McKay, Libin Fu, Shigeru Suzuki, DONG LIANG, FERMANN MARTIN E, MCKAY HUGH, FU LIBIN, SUZUKI SHIGERU, FERMANN MARTIN E.
Принадлежит: IMRA America, Inc., DONG LIANG, FERMANN MARTIN E, MCKAY HUGH, FU LIBIN, SUZUKI SHIGERU, IMRA AMERICA INC, FERMANN MARTIN E., IMRA AMERICA, INC.

Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber.

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Номер записи: 3
24-06-2010 дата публикации

GLASS LARGE-CORE OPTICAL FIBERS

Номер: US20100157418A1
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS
Принадлежит: IMRA America, Inc.

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1-n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×103. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss ...

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Номер записи: 4
27-08-2015 дата публикации

GLASS LARGE-CORE OPTICAL FIBERS

Номер: US20150241628A1
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius
Принадлежит:

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n−n)/n, where nis the index of refraction of the cladding material in which the cladding features are included, and nis the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss. 1. (canceled)2. A fiber comprising:a first cladding region comprising a first cladding material having a first index of refraction, n1;cladding features disposed in said first cladding region, said cladding features comprising a second cladding material having a second index of refraction, n2, wherein n2 is less than n1, and wherein the cladding features have a dimension d and a center-to-center spacing Λ, and a ratio d/Λ is in a range from 0.3 to 0.9, said cladding features comprising a plurality of holes disposed in said first cladding region; anda core region at least partially surrounded by said cladding features, said first cladding region and said cladding features configured such that said core region propagates at least one lower order mode having a wavelength, while limiting propagation of at least one higher order mode having the wavelength by providing said at least one higher order mode with a higher loss than the at least one lower order mode at the wavelength.3. The fiber of claim 2 , wherein said fiber is configured as an all-glass claim ...

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Номер записи: 5
02-09-2014 дата публикации

Ultra small core fiber with dispersion tailoring

Номер: US0008824847B2
Автор: Liang Dong, Brian Thomas, Libin Fu
Принадлежит: IMRA America, Inc.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

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Номер записи: 6
16-07-2019 дата публикации

Glass large-core optical fibers

Номер: US0010353144B2
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS, Dong, Liang, Li, Jun, McKay, Hugh, Fu, Libin, Marcinkevicius, Andrius
Принадлежит: IMRA America, Inc., IMRA AMERICA INC

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1−n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10−3. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 7
07-11-2013 дата публикации

WIDE BANDWIDTH, LOW LOSS PHOTONIC BANDGAP FIBERS

Номер: US20130294736A1
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu
Принадлежит: IMRA AMERICA, INC.

Various embodiments include photonic bandgap fibers (PBGF). Some PBGF embodiments have a hollow core (HC) and may have a square lattice (SQL). In various embodiments, SQL PBGF can have a cladding region including 2-10 layers of air-holes. In various embodiments, an HC SQL PBGF can be configured to provide a relative wavelength transmission window Δλ/λc larger than about 0.35 and a minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF can be a polarization maintaining fiber. Methods of fabricating PBGF are also disclosed along with some examples of fabricated fibers. Various applications of PBGF are also described.

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Номер записи: 8
30-09-2010 дата публикации

WIDE BANDWIDTH, LOW LOSS PHOTONIC BANDGAP FIBERS

Номер: US20100247046A1
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu, DONG LIANG, THOMAS BRIAN K, SUZUKI SHIGERU, FU LIBIN, THOMAS BRIAN K.
Принадлежит: IMRA AMERICA, INC.

Various embodiments described herein comprise hollow core (HC) photonic bandgap fibers (PBGF) with a square lattice (SQL). In various embodiments the, HC SQL PBGF includes a cladding region comprising 2-10 layers of air-holes. In various embodiments, the HC SQL PBGF can be configured to provide a relative wavelength transmission window /c larger than about 0.35 and minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF fiber can be a polarization maintaining fiber. Methods of fabricating such fibers are also disclosed herein along with some examples of fabricated fibers. Various applications of such fibers are also described herein.

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Номер записи: 9
14-11-2013 дата публикации

HIGHLY RARE-EARTH-DOPED OPTICAL FIBERS FOR FIBER LASERS AND AMPLIFIERS

Номер: US20130301115A1
Автор: Liang Dong, Martin E. Fermann, Hugh McKay, Libin Fu, Shigeru Suzuki
Принадлежит:

Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber. 1. An optical fiber comprising:a rare earth doped glass comprising silica, ytterbium, phosphorus, and aluminum,wherein the concentration of ytterbium in said rare-earth doped glass is in the range from 0.5 to 15 mol % so that said optical fiber is configured to have a peak absorption greater than about 3000 dB/m at a pump wavelength and a gain greater than about 0.5 dB/cm at an emission wavelength,{'sub': 2', '5, 'wherein the concentration of phosphorous in said rare-earth doped glass comprises at least 50 mol % POso that a saturated value of photo-darkening loss in the optical fiber is less than about 10 dB/m at said emission wavelength,'}wherein the concentration of aluminum in said rare-earth doped glass is in a range from 0.5 to 15 mol %, andwherein the concentration of boron in said rare-earth doped glass is in a range from 0 to 25 mol %.2. The optical fiber of claim 1 , wherein said optical fiber is a large-core optical fiber having a core diameter larger than about 30 μm.3. The optical fiber of claim 2 , wherein said core diameter is less than about 130 μm.4. The optical fiber of claim 1 , wherein said rare-earth doped glass further comprises 0.5 to 1 mol % erbium.5. The optical fiber of claim 1 , wherein the concentration of aluminum in said rare-earth doped glass is in a range from 1 to 10 mol %.6. The optical fiber of claim 1 , wherein the concentration of aluminum in said ...

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Номер записи: 10
09-10-2012 дата публикации

Wide bandwidth, low loss photonic bandgap fibers

Номер: US0008285098B2
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu, DONG LIANG, THOMAS BRIAN K, SUZUKI SHIGERU, FU LIBIN, THOMAS BRIAN K.
Принадлежит: IMRA America, Inc., DONG LIANG, THOMAS BRIAN K, SUZUKI SHIGERU, FU LIBIN, IMRA AMERICA INC, THOMAS BRIAN K., IMRA AMERICA, INC.

Various embodiments include photonic bandgap fibers (PBGF). Some PBGF embodiments have a hollow core (HC) and may have a square lattice (SQL). In various embodiments, SQL PBGF can have a cladding region including 2-10 layers of air-holes. In various embodiments, an HC SQL PBGF can be configured to provide a relative wavelength transmission window /c larger than about 0.35 and a minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF can be a polarization maintaining fiber. Methods of fabricating PBGF are also disclosed along with some examples of fabricated fibers. Various applications of PBGF are also described.

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Номер записи: 11
02-12-2014 дата публикации

Highly rare-earth-doped optical fibers for fiber lasers and amplifiers

Номер: US0008902493B2
Автор: Liang Dong, Martin E. Fermann, Hugh McKay, Libin Fu, Shigeru Suzuki, DONG LIANG, FERMANN MARTIN E, MCKAY HUGH, FU LIBIN, SUZUKI SHIGERU, FERMANN MARTIN E.
Принадлежит: IMRA America, Inc., IMRA AMERICA INC, IMRA AMERICA, INC.

Various embodiments described herein comprise a laser and/or an amplifier system including a doped gain fiber having ytterbium ions in a phosphosilicate glass. Various embodiments described herein increase pump absorption to at least about 1000 dB/m-9000 dB/m. The use of these gain fibers provide for increased peak-powers and/or pulse energies. The various embodiments of the doped gain fiber having ytterbium ions in a phosphosilicate glass exhibit reduced photo-darkening levels compared to photo-darkening levels obtainable with equivalent doping levels of an ytterbium doped silica fiber.

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Номер записи: 12
17-04-2012 дата публикации

Glass large-core optical fibers

Номер: US0008159742B2
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS
Принадлежит: IMRA America, Inc., DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS, IMRA AMERICA INC, IMRA AMERICA, INC.

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×103. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 13
01-10-2009 дата публикации

ULTRA SMALL CORE FIBER WITH DISPERSION TAILORING

Номер: US20090245729A1
Автор: Liang Dong, Brian Thomas, Libin Fu
Принадлежит: IMRA AMERICA, INC.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

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Номер записи: 14
10-10-2013 дата публикации

ULTRA SMALL CORE FIBER WITH DISPERSION TAILORING

Номер: US20130265635A1
Автор: Liang Dong, Brian Thomas, Libin Fu
Принадлежит:

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum. 1. An optical fiber capable of propagating light having a wavelength , the optical fiber comprising:a core having a diameter less than about 4 μm;a first region at least partially surrounding the core, the first region comprising a plurality of first features collectively having a first filling factor in the first region that is less than about 90 percent; anda second region at least partially surrounding the first region, the second region comprising a plurality of second features collectively having a second filling factor in the second region that is greater than about 90 percent,wherein the optical fiber is configured to control dispersion of the light and substantially confine the light to the core.2. The optical fiber of claim 1 , wherein the core diameter is in a range from about 1 μm to about 4 μm.3. The optical fiber of claim 1 , wherein the first filling factor is greater than about 50%.4. The optical fiber of claim 1 , wherein the first filling factor is less than the second filling factor.5. The optical fiber of claim 1 , further comprising:an outer layer surrounding the second region; anda plurality of webs mechanically coupling the first region and the outer layer ...

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Номер записи: 15
31-03-2015 дата публикации

Glass large-core optical fibers

Номер: US0008995051B2
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS
Принадлежит: IMRA America, Inc., DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS, IMRA AMERICA INC, IMRA AMERICA, INC.

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×103. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 16
26-07-2012 дата публикации

GLASS LARGE-CORE OPTICAL FIBERS

Номер: US20120188632A1
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS
Принадлежит: IMRA AMERICA, INC.

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×103. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 17
24-04-2012 дата публикации

Ultra small core fiber with dispersion tailoring

Номер: US0008165441B2
Автор: Liang Dong, Brian Thomas, Libin Fu, DONG LIANG, THOMAS BRIAN, FU LIBIN
Принадлежит: IMRA America, Inc., DONG LIANG, THOMAS BRIAN, FU LIBIN, IMRA AMERICA INC, IMRA AMERICA, INC.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

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Номер записи: 18
25-04-2017 дата публикации

Glass large-core optical fibers

Номер: US0009632243B2
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius, DONG LIANG, LI JUN, MCKAY HUGH, FU LIBIN, MARCINKEVICIUS ANDRIUS, Dong Liang, Li Jun, McKay Hugh, Fu Libin, Marcinkevicius Andrius
Принадлежит: IMRA America, Inc., IMRA AMERICA INC

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n 1 -n 2 )/n 1 , where n 1 is the index of refraction of the cladding material in which the cladding features are included, and n 2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10 −3 . In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 19
18-06-2013 дата публикации

Ultra small core fiber with dispersion tailoring

Номер: US0008467648B2
Автор: Liang Dong, Brian Thomas, Libin Fu, DONG LIANG, THOMAS BRIAN, FU LIBIN
Принадлежит: IMRA America, Inc., DONG LIANG, THOMAS BRIAN, FU LIBIN, IMRA AMERICA INC, IMRA AMERICA, INC.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

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Номер записи: 20
02-07-2013 дата публикации

Wide bandwidth, low loss photonic bandgap fibers

Номер: US0008478097B2
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu, DONG LIANG, THOMAS BRIAN K, SUZUKI SHIGERU, FU LIBIN, THOMAS BRIAN K.
Принадлежит: IMRA America, Inc., DONG LIANG, THOMAS BRIAN K, SUZUKI SHIGERU, FU LIBIN, IMRA AMERICA INC, THOMAS BRIAN K., IMRA AMERICA, INC.

Various embodiments include photonic bandgap fibers (PBGF). Some PBGF embodiments have a hollow core (HC) and may have a square lattice (SQL). In various embodiments, SQL PBGF can have a cladding region including 2-10 layers of air-holes. In various embodiments, an HC SQL PBGF can be configured to provide a relative wavelength transmission window Deltalambda/lambdac larger than about 0.35 and a minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF can be a polarization maintaining fiber. Methods of fabricating PBGF are also disclosed along with some examples of fabricated fibers. Various applications of PBGF are also described.

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Номер записи: 21
09-11-2017 дата публикации

GLASS LARGE-CORE OPTICAL FIBERS

Номер: US20170322370A1
Автор: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius
Принадлежит: IMRA America Inc

Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n 1 −n 2 )/n 1 , where n 1 is the index of refraction of the cladding material in which the cladding features are included, and n 2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10 −3 . In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.

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Номер записи: 22
09-05-2013 дата публикации

WIDE BANDWIDTH, LOW LOSS PHOTONIC BANDGAP FIBERS

Номер: US20130114936A1
Автор: Liang Dong, Brian K. Thomas, Shigeru Suzuki, Libin Fu
Принадлежит: IMRA AMERICA, INC.

Various embodiments include photonic bandgap fibers (PBGF). Some PBGF embodiments have a hollow core (HC) and may have a square lattice (SQL). In various embodiments, SQL PBGF can have a cladding region including 2-10 layers of air-holes. In various embodiments, an HC SQL PBGF can be configured to provide a relative wavelength transmission window Δλ/λc larger than about 0.35 and a minimum transmission loss in a range from about 70 dB/km to about 0.1 dB/km. In some embodiments, the HC SQL PBGF can be a polarization maintaining fiber. Methods of fabricating PBGF are also disclosed along with some examples of fabricated fibers. Various applications of PBGF are also described.

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Номер записи: 23
13-12-2012 дата публикации

ULTRA SMALL CORE FIBER WITH DISPERSION TAILORING

Номер: US20120314995A1
Автор: Liang Dong, Brian Thomas, Libin Fu, DONG LIANG, THOMAS BRIAN, FU LIBIN
Принадлежит: IMRA AMERICA, INC.

Various embodiments of optical fiber designs and fabrication processes for ultra small core fibers (USCF) are disclosed. In some embodiments, the USCF includes a core that is at least partially surrounded by a region comprising first features. The USCF further includes a second region at least partially surrounding the first region. The second region includes second features. In an embodiment, the first features are smaller than the second features, and the second features have a filling fraction greater than about 90 percent. The first features and/or the second features may include air holes. Embodiments of the USCF may provide dispersion tailoring. Embodiments of the USCF may be used with nonlinear optical devices configured to provide, for example, a frequency comb or a supercontinuum.

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Номер записи: 24
03-03-2015 дата публикации

Auto-cladded multi-core optical fibers

Номер: US0008970947B2
Автор: Martin E. Fermann, Liang Dong, Libin Fu, Hugh A. McKay, FERMANN MARTIN E, DONG LIANG, FU LIBIN, MCKAY HUGH A, FERMANN MARTIN E., MCKAY HUGH A.
Принадлежит: IMRA America, Inc., FERMANN MARTIN E, DONG LIANG, FU LIBIN, MCKAY HUGH A, IMRA AMERICA INC, FERMANN MARTIN E., MCKAY HUGH A., IMRA AMERICA, INC.

Embodiments of auto-cladded optical fibers are described. The fibers may have a refractive index profile having a small relative refractive index change. For example, the fiber may include an auto-cladded structure having, e.g., a trough or gradient in the refractive index profile. A beam of light propagating in the fiber may be guided, at least in part, with the auto-cladded structure. In some embodiments, the optical fiber may be all glass. In some embodiments, the optical fiber may include a large-core or an ultra large-core.

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Номер записи: 25