公开(公告)号：US20210063208A1

公开(公告)日：2021-03-04

申请号：US16999147

申请日：2020-08-21

Applicant: CORNING INCORPORATED

Inventor： Ming-Jun Li

IPC: G01D5/353 ,  G02B6/02 ,  G01K11/32 ,  G01L1/24

Abstract: An optical fiber sensor with high sensitivity and high spatial resolution is described. The optical fiber sensor includes a multicore fiber having cores configured to permit crosstalk between cores. Crosstalk corresponds to transfer of an optical signal from a core to another core and is used as a mechanism for sensing the external environment surrounding the multicore optical fiber. The degree of crosstalk depends on the relative refractive index profile of the cores and surrounding cladding, as well as on the spacing between cores. The external environment surrounding the multicore optical fiber and changes therein influence crosstalk between cores to permit sensing. The relative refractive index profiles of the cores are also configured to provide a group delay difference for optical signals propagating in different cores. The group delay difference facilitates the position of an external perturbation along the length of the multicore optical fiber.

公开(公告)号：US10921512B2

公开(公告)日：2021-02-16

申请号：US16141257

申请日：2018-09-25

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Curtis Richard Cowles ,  Richard Michael Fiacco ,  Ming-Jun Li ,  Jason Roy Pace ,  Jeffery Scott Stone

IPC: C03B37/03 ,  G02B6/028 ,  G02B6/036 ,  G02B6/02 ,  C03B37/027

Abstract: Methods of manufacturing multi-mode optical fiber, and multi-mode optical fiber produced thereby, are disclosed. According to embodiments, a method for forming an optical fiber may include heating a multi-mode optical fiber preform and applying a draw tension to a root of the multi-mode optical fiber preform on a long axis of the multi-mode optical fiber preform thereby drawing a multi-mode optical fiber from the root of the multi-mode optical fiber preform. The draw tension may be modulated while the multi-mode optical fiber is drawn from the root of the multi-mode optical fiber preform. Modulating the draw tension introduces stress perturbations in the multi-mode optical fiber and corresponding refractive index perturbations in a core of the multi-mode optical fiber.

公开(公告)号：US20210026063A1

公开(公告)日：2021-01-28

申请号：US16930811

申请日：2020-07-16

Applicant: CORNING INCORPORATED

Inventor： Xin Chen ,  Kangmei Li ,  Ming-Jun Li

IPC: G02B6/02 ,  G02B6/036 ,  G02B6/028 ,  H04B10/25 ,  H04B10/50 ,  H04B10/66

Abstract: The optical fibers disclosed have single mode and few mode optical transmission for VCSEL-based optical fiber transmission systems. The optical fibers have a cable cutoff wavelength λd C of equal to or below 1260 nm thereby defining single mode operation at wavelengths greater than 1260 nm and few-mode operation at wavelengths in a wavelength range from 800 nm and 1100 nm. The mode-field diameter is in the range from 8.0 microns to 10.1 microns at 1310 nm. The optical fibers have an overfilled bandwidth OFL BW of at least 1GHz·km at at least one wavelength in the wavelength range. The optical fibers have a single-step or two-step core and can have a trench refractive index profile. VCSEL based optical transmission systems and methods are disclosed that utilize both single core and multicore versions of the optical fiber.

公开(公告)号：US10775558B2

公开(公告)日：2020-09-15

申请号：US16260515

申请日：2019-01-29

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Ming-Jun Li ,  Pushkar Tandon

IPC: G02B6/28 ,  G02B6/028 ,  G02B6/036 ,  G02B6/02

Abstract: A single mode optical fiber includes: (i) a silica based core having a refractive index profile with an alpha (α) between 1.8 and 200, a relative refractive index Δ1max %, and an outer radius r1, wherein 7 microns>r1≥4.5 microns, the core further comprising silica doped with chlorine, wherein the maximum chlorine concentration in the core is greater than 0.5 wt %; and wherein 1.40 Δ4%.

公开(公告)号：US20200257040A1

公开(公告)日：2020-08-13

申请号：US16747179

申请日：2020-01-20

Applicant: CORNING INCORPORATED

Inventor： Xin Chen ,  Ming-Jun Li

IPC: G02B6/028 ,  G02B6/42 ,  G02B6/036

Abstract: The optical fibers disclosed have single mode and few mode optical transmission for VCSEL-based optical fiber transmission systems. The optical fibers have a cable cutoff wavelength λC of equal to or below 1260 nm thereby defining single mode operation at a wavelength in a first wavelength range greater than 1260 nm and few-mode operation at a wavelength in a second wavelength range from 840 nm and 1060 nm. The mode-field diameter is in the range from 8.6 microns to 11 microns at 1550 nm or in the range from 8.0 microns to 10.1 microns at 1310 nm. The optical fibers have an overfilled bandwidth OFL BW of at least 1 GHz·km at the at least one wavelength in the second wavelength range. The optical fibers have a gradient-index core and can have a trench refractive index profile. VCSEL based optical transmission systems and methods are disclosed that utilize both single core and multicore versions of the optical fiber.

公开(公告)号：US20200174180A1

公开(公告)日：2020-06-04

申请号：US16638604

申请日：2018-08-20

Applicant: CORNING INCORPORATED

Inventor： Ming-Jun Li ,  Gary Richard Trott

IPC: G02B6/02 ,  G02B6/12

Abstract: The glass-based THz optical waveguides (10) disclosed herein are used to guide optical signals having a THz frequency in the range from 0.1 THz to (10) THz and include a core (20) surrounded by a cladding (30). The core has a diameter D1 in the range from (30) μm to 10 mm and is made of fused silica glass having a refractive index n1. The cladding is made of either a polymer or a glass or glass soot and has a refractive index n2

公开(公告)号：US10663326B2

公开(公告)日：2020-05-26

申请号：US16047582

申请日：2018-07-27

Applicant: Corning Incorporated

Inventor： Anthony Artuso ,  Valery A Kozlov ,  Ming-Jun Li

IPC: G02B6/10 ,  G01D5/353 ,  C03B37/018 ,  C03B37/025 ,  C03C3/06 ,  C03B37/014 ,  C03C14/00 ,  C03C13/04 ,  C03B37/027

Abstract: A fiber sensor includes an optical fiber configured for operation at a wavelength from about 800 nm to about 1600 nm. The optical fiber includes a cladding that is defined by a fiber outer diameter and a core that is surrounded by the cladding. The core of the optical fiber has a Rayleigh scattering coefficient, αs, that is controlled by controlling a concentration of one or more dopants in the core. The Rayleigh scattering coefficient is tuned to be within a predetermined range of an optimum Rayleigh scattering coefficient for a given total length, L, of the optical fiber. The predetermined range is from about 70% of the optimum αs to about 130% of the optimum αs.

公开(公告)号：US10392291B2

公开(公告)日：2019-08-27

申请号：US14970642

申请日：2015-12-16

Applicant: CORNING INCORPORATED

Inventor： Raymond D. Groh ,  Ming-Jun Li ,  Alper Ozturk ,  Chunfeng Zhou

IPC: C03B37/014 ,  C03B37/012

Abstract: A method for forming an optical fiber preform is provided. The method includes inserting a glass core cane into a glass sleeve such that the glass sleeve surrounds a portion of the glass core cane and such that there is a gap between the glass sleeve and the portion of the glass core cane surrounded by the glass sleeve. The method further includes depositing silica soot onto at least a portion of the glass core cane and at least a portion of the glass sleeve to form a silica soot preform, and flowing gas through the gap during processing of the silica soot preform.

公开(公告)号：US10302463B2

公开(公告)日：2019-05-28

申请号：US15192114

申请日：2016-06-24

Applicant: Corning Incorporated

Inventor： Valery A Kozlov ,  Ming-Jun Li

IPC: G02B6/02 ,  G01D5/26 ,  G02B6/26 ,  G02B6/42 ,  G01K11/32 ,  G01L1/24 ,  G02B6/12

Abstract: A fiber sensor that includes: an optical fiber configured for one of single or few mode operation at a wavelength from about 300 nm to about 2000 nm, and further defined by a transmission end, a scattering end, a fiber outer diameter and a fiber length from about 10 m to about 100 km. The fiber includes: a plurality of cores having equivalent core diameters and compositions; and a cladding defined by the fiber outer diameter and surrounding the cores. The fiber is tapered at the transmission end to define a tapered portion characterized by a tapered fiber out diameter and tapered core diameters smaller than the respective fiber outer diameter and core diameters. Further, the transmission end of the fiber exhibits a total backscattered signal that emanates from the cores after light from a single source has been injected into the cores at the transmission end of the fiber.

公开(公告)号：US20190127264A1

公开(公告)日：2019-05-02

申请号：US16167830

申请日：2018-10-23

Applicant: Corning Incorporated

Inventor： Dana Craig Bookbinder ,  Steven Bruce Dawes ,  Richard Michael Fiacco ,  Brian Lee Harper ,  Ming-Jun Li ,  Pushkar Tandon

IPC: C03B37/014 ,  C03B19/14 ,  G02B6/02 ,  C03C3/06 ,  C03C13/04

Abstract: Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration and sintering halogen-doped silica to a closed-pore state. The sintering includes a high pressure sintering treatment and a low pressure sintering treatment. The high pressure sintering treatment is conducted in the presence of a high partial pressure of a gas-phase halogen doping precursor and densifies a silica soot body to a partially consolidated state. The low pressure sintering treatment is conducted in the presence of a low partial pressure of gas-phase halogen doping precursor and transforms a partially consolidated silica body to a closed-pore state. The product halogen-doped silica glass exhibits little foaming when heated to form fibers in a draw process or core canes in a redraw process.