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公开(公告)号：US20200292751A1
公开(公告)日：2020-09-17
申请号：US16877044
申请日：2020-05-18
申请人： OFS FITEL, LLC
发明人： David J. DiGiovanni , Daryl Inniss , Brian Mangan , Vitaly Mikhailov , John E. Pacini , Tristan Kremp
摘要： A hollow core optical fiber and cable combination is configured to exhibit minimal SNR and loss degradation. This is achieved by either: (1) reducing the coupling between the fundamental and other (unwanted) modes propagating within the hollow core fiber; or (2) increasing the propagation loss along the alternative. The first approach may be achieved by designing the cable to minimize perturbations and/or designing the hollow core fiber to fully separate the fundamental mode from the unwanted modes so as to reduce coupling into the unwanted modes. Whether through fiber design or cable design, the amount of light coupled into unwanted modes is reduced to acceptable levels. The second approach may be realized through either fiber design and/or cable design to suppress the light in unwanted modes so that an acceptably low level of light is coupled back into the fundamental mode.
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公开(公告)号：US20190107670A1
公开(公告)日：2019-04-11
申请号：US16155310
申请日：2018-10-09
申请人： OFS Fitel, LLC
发明人： Tristan Kremp , Brian Mangan , Robert S. Windeler
IPC分类号： G02B6/02
摘要： A hollow core fiber (HCF) has a cross section with a substantially-circular hollow core in a cladding lattice, an axial center and a reference direction that extends radially in one direction from the axial center. The HCF comprises modified holes that are located along linear paths that extend radially outward from the axial center. The modified holes, which are located at various radial distances from the axial center and at various azimuthal angles from the reference direction, have non-uniform modified properties. These non-uniform modified properties include radially-varying properties, azimuthally-varying properties, or a combination of radially-varying and azimuthally-varying properties.
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公开(公告)号：US20220342146A1
公开(公告)日：2022-10-27
申请号：US17636890
申请日：2020-08-21
申请人： OFS Fitel, LLC
发明人： Matt Corrado , Brian Mangan , Tristan Kremp
摘要： Described herein are systems, methods, and articles of manufacture for reducing coupling loss between optical fibers, more particularly, to reducing coupling loss between a hollow-core optical fiber (HCF) and another fiber, such as solid core fibers (SCF), through the use of mismatched mode field diameter (MFD). According to one embodiment, an article is configured to reduce a coupling loss between multiple optical fibers, wherein the article includes an HCF supporting the propagation of a first mode and an SCF coupled to the HCF. According to a further embodiment, a method is described for reducing the coupling loss or splicing loss between optical fibers, such as an exemplary HCF and a solid core SMF. These exemplary methods may include coupling/splicing an exemplary HCF to an exemplary SMF with significantly smaller MFD.
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4.发明申请公开(公告)号：US20220073407A1
公开(公告)日：2022-03-10
申请号：US17526322
申请日：2021-11-15
申请人： OFS Fitel, LLC
IPC分类号： C03B37/025 , G02B6/02
摘要： An apparatus for fabricating a hollow core optical fiber with a controllable core region (in terms of diameter) is based upon regulating conditions (gas flow, volume, and/or temperature) within the hollow core region during the fiber draw process. The introduction of a gas, or any change in volume or temperature of the hollow core region, allows for the diameter of the hollow core region to self-regulate as a multistructured core rod (MCR) is drawn down into the final hollow core optical fiber structure. This self-regulation provides a core region having a diameter that selected and then stabilized for the duration of the draw process. The inventive apparatus is also useful in controlling the diameter of any selected hollow region of an MCR including, but not limited to, shunts and corner capillaries disposed around the core region.
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公开(公告)号：US20200257042A1
公开(公告)日：2020-08-13
申请号：US16858355
申请日：2020-04-24
申请人： OFS FITEL, LLC
发明人： Tristan Kremp , Brian Mangan , Robert S. Windeler
IPC分类号： G02B6/02
摘要： A hollow core fiber (HCF) has a cross section with a substantially-circular hollow core in a cladding lattice, an axial center and a reference direction that extends radially in one direction from the axial center. The HCF comprises modified holes that are located along linear paths that extend radially outward from the axial center. The modified holes, which are located at various radial distances from the axial center and at various azimuthal angles from the reference direction, have non-uniform modified properties. These non-uniform modified properties include radially-varying properties, azimuthally-varying properties, or a combination of radially-varying and azimuthally-varying properties.
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公开(公告)号：US20200319399A1
公开(公告)日：2020-10-08
申请号：US16373848
申请日：2019-04-03
申请人： OFS Fitel, LLC
发明人： Brian Mangan
IPC分类号： G02B6/02 , C03B37/027
摘要： The selection of starting materials used in the process of forming an MCR is controlled to specifically define the physical properties of the core tube and/or the capillary tubes in the local vicinity of the core tube. The physical properties are considered to include, but are not limited to, the diameter of a given tube/capillary, its wall thickness, and its geometry (e.g., circular, non-circular). A goal is to select starting materials with physical properties that yield a final hollow core optical fiber with a “uniform” core region (for the purposes of the present invention, a “uniform” core region is one where the struts of cladding periodic array surrounding the central core are uniform in length and thickness (with the nodes between the struts thus being uniformly spaced apart), which yields a core wall of essentially uniform thickness and circularity.
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7.发明申请公开(公告)号：US20200079680A1
公开(公告)日：2020-03-12
申请号：US16128951
申请日：2018-09-12
申请人： OFS Fitel, LLC
发明人： Matt Corrado , David J DiGiovanni , Brian Mangan , Gabriel Puc , Robert S Windeler , Tristan Kremp
IPC分类号： C03B37/027 , G02B6/032 , G02B6/02
摘要： A process of fabricating the microstructure core rod preform used in the fabrication of a hollow core optical fiber includes the step of applying external pressure to selected hollow regions during the drawing of the preform from the initial assembly of capillary tubes. The application of pressure assists the selected hollow regions in maintaining their shape as much as possible during draw, and reduces distortions in the microstructure cells in close proximity to the core by controlling glass distribution during MCR draw.
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公开(公告)号：US11221444B2
公开(公告)日：2022-01-11
申请号：US16373848
申请日：2019-04-03
申请人： OFS Fitel, LLC
发明人： Brian Mangan , Gabriel Puc , Matt Corrado , Tristan Kremo
IPC分类号： G02B6/02 , C03B37/027
摘要： The selection of starting materials used in the process of forming an MCR is controlled to specifically define the physical properties of the core tube and/or the capillary tubes in the local vicinity of the core tube. The physical properties are considered to include, but are not limited to, the diameter of a given tube/capillary, its wall thickness, and its geometry (e.g., circular, non-circular). A goal is to select starting materials with physical properties that yield a final hollow core optical fiber with a “uniform” core region (for the purposes of the present invention, a “uniform” core region is one where the struts of cladding periodic array surrounding the central core are uniform in length and thickness (with the nodes between the struts thus being uniformly spaced apart), which yields a core wall of essentially uniform thickness and circularity.
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9.发明授权公开(公告)号：US11203547B2
公开(公告)日：2021-12-21
申请号：US16042247
申请日：2018-07-23
申请人： OFS Fitel, LLC
IPC分类号： C03B37/025 , G02B6/02
摘要： A technique for fabricating a hollow core optical fiber with a controllable core region (in terms of diameter) is based upon regulating conditions (gas flow, volume, and/or temperature) within the hollow core region during the fiber draw process. The introduction of a gas, or any change in volume or temperature of the hollow core region, allows for the diameter of the hollow core region to self-regulate as a multistructured core rod (MCR) is drawn down into the final hollow core optical fiber structure. This self-regulation provides a core region having a diameter that selected and then stabilized for the duration of the draw process. The inventive process is also useful in controlling the diameter of any selected hollow region of an MCR including, but not limited to, shunts and corner capillaries disposed around the core region.
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公开(公告)号：US10684411B2
公开(公告)日：2020-06-16
申请号：US16475531
申请日：2018-04-05
申请人： OFS Fitel, LLC
发明人： David J DiGiovanni , Daryl Inniss , Brian Mangan , Vitaly Mikhailov , John E Pacini , Tristan Kremp
摘要： A hollow core optical fiber and cable combination is configured to exhibit minimal SNR and loss degradation. This is achieved by either: (1) reducing the coupling between the fundamental and other (unwanted) modes propagating within the hollow core fiber, or (2) increasing the propagation loss along the alternative. The first approach may be achieved by designing the cable to minimize perturbations and/or designing the hollow core fiber to fully separate the fundamental mode from the unwanted modes so as to reduce coupling into the unwanted modes. Whether through fiber design or cable design, the amount of light coupled into unwanted modes is reduced to acceptable levels. The second approach may be realized through either fiber design and/or cable design to suppress the light in unwanted modes so that an acceptably low level of light is coupled back into the fundamental mode.
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