公开(公告)号：US07542645B1

公开(公告)日：2009-06-02

申请号：US12077570

申请日：2008-03-20

Applicant: Yan Hua ,  Elli Makrides-Saravanos ,  Ming-Jun Li

Inventor： Yan Hua ,  Elli Makrides-Saravanos ,  Ming-Jun Li

IPC: G02B6/032 ,  G02B6/00

CPC classification number: G02B6/02366 ,  G02B6/02357 ,  G02B6/0365 ,  G02B6/255 ,  G02B6/262

Abstract: An airline (AL) optical fiber (“AL fiber”) that has an AL region with airlines, with the AL region arranged relative to the fiber core so as to make the fiber bend insensitive. The AL region is capable of supporting one or more higher-order optical modes. One method of reducing multipath interference (MPI) includes accessing a section of the AL fiber and closing at least one of the airlines in the section. This serves to attenuate one or more higher-order modes, which reduces MPI. In one example, the AL fiber has an end section wherein the airlines are filled with a blocking material. An example blocking material is a curable adhesive that is wicked into the airlines via capillary action and then cured when the adhesive reaches a certain depth from the fiber end. In another example, the blocking material is formed by heating the AL fiber section to cause the section to melt and block the airlines, so that the melted AL fiber serves as the blocking material. The AL fiber with reduced MPI is particularly useful as a “jump” fiber, whose length is too short to rely on attenuating higher-order modes via a cable cut-off wavelength.

Abstract translation: 具有AL区域的航空公司（AL）光纤（“AL纤维”），其中AL区域相对于纤维芯布置，以使纤维弯曲不敏感。 AL区域能够支持一个或多个高阶光学模式。 减少多路径干扰（MPI）的一种方法包括访问AL光纤的一部分并关闭该部分中的至少一个航空公司。 这用于衰减一个或多个更高阶模式，这降低了MPI。 在一个示例中，AL纤维具有端部，其中航空公司填充有阻挡材料。 示例性阻挡材料是通过毛细管作用被弄脏到航空公司中的可固化粘合剂，然后当粘合剂从纤维端达到一定深度时固化。 在另一个实例中，通过加热AL纤维部分来形成阻挡材料，使得该部分熔化并阻塞航空公司，使得熔融的AL纤维用作阻挡材料。 具有降低的MPI的AL纤维作为“跳跃”光纤是特别有用的，其长度太短而不能通过电缆截止波长衰减高阶模式。

公开(公告)号：US09481599B2

公开(公告)日：2016-11-01

申请号：US13331610

申请日：2011-12-20

Applicant: Scott Robertson Bickham ,  Oleksandr Kogan ,  Ming-Jun Li ,  Snigdharaj Kumar Mishra ,  Pushkar Tandon

Inventor： Scott Robertson Bickham ,  Oleksandr Kogan ,  Ming-Jun Li ,  Snigdharaj Kumar Mishra ,  Pushkar Tandon

IPC: C03B37/014 ,  G02B6/028 ,  C03B37/025

CPC classification number: C03B37/01413 ,  C03B37/0253 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/32 ,  C03B2203/23 ,  C03B2203/26 ,  C03B2205/40 ,  G02B6/0288 ,  Y02P40/57

Abstract: A method of making a multimode optical fiber is disclosed. In one embodiment the method includes calculating a core radius that maximizes the bandwidth of the multimode optical fiber wherein the effect of draw tension is accounted for. The embodiments herein illustrate how core radius can be tuned so the time delay of the outermost guided mode group is reduced. The resultant core radius may be targeted for a value off-nominal from what would be expected for a particular commercial optical fiber type.

Abstract translation: 公开了制造多模光纤的方法。 在一个实施例中，该方法包括计算最大化多模光纤的带宽的纤芯半径，其中考虑拉伸张力的影响。 这里的实施例示出了如何调整芯部半径，使得最外面的引导模式组的时间延迟减小。 所得到的芯部半径可以是针对特定商业光纤类型的预期值的标称值。

公开(公告)号：US08977092B2

公开(公告)日：2015-03-10

申请号：US13553899

申请日：2012-07-20

Applicant: Scott Robertson Bickham ,  Dana Craig Bookbinder ,  Ming-Jun Li ,  Pushkar Tandon

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

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

CPC classification number: G02B6/0288 ,  G02B6/02023 ,  G02B6/0281 ,  G02B6/0365

Abstract: One exemplary multimode optical fiber includes a graded index glass core having a diameter in the range of 41 microns to 80 microns, a graded index having an alpha less than 2.04 and a maximum relative refractive index in the range between 0.6% and 1.8%. The cladding includes a depressed-index annular portion. The fiber has an overfilled bandwidth greater than 2.5 GHz-km at at least one wavelength between 1200 nm and 1700 nm.

Abstract translation: 一个示例性多模光纤包括直径在41微米至80微米范围内的分级折射率玻璃芯，具有α小于2.04的分级折射率和0.6％至1.8％范围内的最大相对折射率。 包层包括凹陷折射率的环形部分。 该纤维在1200nm至1700nm之间的至少一个波长处具有大于2.5GHz-km的过满的带宽。

公开(公告)号：US08744782B2

公开(公告)日：2014-06-03

申请号：US12947066

申请日：2010-11-16

Applicant: Xin Chen ,  Ming-Jun Li ,  Anping Liu ,  Daniel Aloysius Nolan

Inventor： Xin Chen ,  Ming-Jun Li ,  Anping Liu ,  Daniel Aloysius Nolan

IPC: G01L11/02 ,  G01L11/00 ,  G01K11/00 ,  G01K11/20

CPC classification number: G01L1/243 ,  G01K11/32 ,  G01K2011/322 ,  G01L1/242

Abstract: A system for simultaneously determining strain and temperature characteristics of an object comprising: (i) at least one optical fiber having at least two Brillouin peaks; (ii) at least one connector securing the optical fiber to the object to be monitored; (iii) a laser positioned to provide laser light to said at least one optical fiber; (iv) a device measuring frequencies of said at least two Brillouin peaks, and determining frequency shifts of said at least two Brillouin peaks for said at least one optical fiber along the length of fiber; and (v) a system calculating strain and temperature characteristics along said fiber, based on the coefficients of strain and temperature as well as the measured Brillouin frequency shifts for said optical fiber along the length of said optical fiber.

Abstract translation: 一种用于同时确定物体的应变和温度特性的系统，包括：（i）至少一个具有至少两个布里渊峰的光纤; （ii）至少一个将光纤固定到待监测对象的连接器; （iii）定位成向所述至少一个光纤提供激光的激光器; （iv）测量所述至少两个布里渊峰的频率的装置，以及确定沿所述光纤长度的所述至少一个光纤的所述至少两个布里渊峰的频移; 以及（v）基于应变和温度的系数以及所述光纤沿着所述光纤的长度测量的布里渊频移的系统来计算沿着所述光纤的应变和温度特性的系统。

公开(公告)号：US08693834B2

公开(公告)日：2014-04-08

申请号：US13420037

申请日：2012-03-14

Applicant: Scott Robertson Bickham ,  Ming-Jun Li ,  Daniel Aloysius Nolan ,  Ji Wang

Inventor： Scott Robertson Bickham ,  Ming-Jun Li ,  Daniel Aloysius Nolan ,  Ji Wang

IPC: H04B10/00

CPC classification number: G02B6/0288 ,  G02B6/02019 ,  G02B6/02023 ,  G02B6/03627 ,  G02B6/0365 ,  H04J14/04

Abstract: A few mode optical fiber suitable for use in a mode division multiplexing (MDM) optical transmission system is disclosed. The optical fiber has a graded-index core with a radius R1 in the range from 8 μm to 14 μm, an alpha value greater than or equal to about 2.3 and less than about 2.7 at a wavelength of 1550 nm, and a maximum relative refractive index Δ1MAX from about 0.3% to about 0.6% relative to the cladding. The optical fiber also has an effective area greater than about 90 μm2 and less than about 160 μm2. The core and cladding support only the LP01 and LP11 modes at wavelengths greater than 1500 nm. The cladding has a maximum relative refractive index Δ4MAX such that Δ1MAX>Δ4MAX, and the differential group delay between the LP01 and LP11 modes is less than about 0.5 ns/km at a wavelength of 1550 nm.

Abstract translation: 公开了适用于模分多路复用（MDM）光传输系统的几种模式光纤。 光纤具有半径R1在8μm至14μm范围内的梯度折射率芯，在1550nm波长处大于或等于约2.3且小于约2.7的α值，以及最大相对折射率 指数＆Dgr; 1MAX，相对于包层为约0.3％至约0.6％。 该光纤还具有大于约90μm2且小于约160μm2的有效面积。 芯和包层只支持波长大于1500 nm的LP01和LP11模式。 包层具有最大相对折射率＆Dgr; 4MAX，使得＆Dgr; 1MAX>＆Dgr; 4MAX，并且LP01和LP11模式之间的差分群延迟在1550nm的波长处小于约0.5ns / km。

公开(公告)号：US08666214B2

公开(公告)日：2014-03-04

申请号：US13680676

申请日：2012-11-19

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

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

IPC: G02B6/02 ,  G02B6/028 ,  G02B6/032 ,  G02B6/10

CPC classification number: G02B6/028 ,  G02B6/02266 ,  G02B6/0281 ,  G02B6/0283 ,  G02B6/0285 ,  G02B6/0286 ,  G02B6/03627 ,  G02B6/03638 ,  G02B6/0365

Abstract: One embodiment of a single mode optical fiber includes: a graded index central core region having outer radius r1 and relative refractive index Δ1; a cladding region comprising (i) a first inner cladding region having an outer radius r2 10 microns and comprising a minimum relative refractive index Δ3, wherein said second inner cladding region has at least one region with a relative refractive index delta that becomes more negative with increasing radius; and (iii) an outer cladding region surrounding the second inner cladding region and comprising relative refractive index Δ4, wherein Δ1>Δ2>Δ3, Δ3

Abstract translation: 单模光纤的一个实施例包括：具有外半径r1和相对折射率Delta1的渐变折射率中心纤芯区域; 包层区域，包括（i）具有外半径r2 <10微米和相对折射率Delta2和0.65 @ r1 / r2 @ 1的第一内包层区域; （ii）和具有外径r3> 10微米并且包括最小相对折射率Delta3的第二内包层区域（即，沟槽），其中所述第二内包层区域具有至少一个具有相对折射率Δδ的区域， 半径越来越大; 和（iii）围绕第二内包层区域并包括相对折射率Delta4的外包层区域，其中Delta1> Delta2> Delta3，Delta3Δ4。

公开(公告)号：US08666213B2

公开(公告)日：2014-03-04

申请号：US13214554

申请日：2011-08-22

Applicant: Ming-Jun Li

Inventor： Ming-Jun Li

IPC: G02B6/028

CPC classification number: G02B6/0288

Abstract: A multimode optical fiber is drawn form an optical fiber preform, and during said drawing step, a series of perturbations are imparted to the fiber along the length of the optical fiber, said perturbations exhibiting a non-constant amplitude or repeat period.

Abstract translation: 多模光纤被拉制成光纤预制棒，并且在所述拉伸步骤期间，沿着光纤的长度向纤维施加一系列扰动，所述扰动表现出非恒定振幅或重复周期。

公开(公告)号：US08588568B2

公开(公告)日：2013-11-19

申请号：US13289029

申请日：2011-11-04

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

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

IPC: G02B6/02

CPC classification number: G02B6/0288 ,  G02B6/0281 ,  G02B6/03627

Abstract: A graded index multimode optical fiber comprising: (a) a silica core doped with germania, and at least one co-dopant, comprising one of P2O5 or F or B2O3, the core extending to outermost core radius, r1 and having a dual alpha, α1; (b) a low index inner cladding surrounding the core and off-set from said core; (c) an outer cladding surrounding and in contact with the inner cladding, such that at least the region of the inner cladding off-set from said core has a lower refractive index than the outer cladding. The center germania concentration at the centerline, CGe1, is greater than or equal to 0, and an outermost germania concentration in the core CGe2, at r1 is greater than or equal to 0. The core has a center co-dopant concentration at the centerline, Cc-d1, greater than or equal to 0, and an outermost co-dopant concentration Cc-d2, at r1, wherein Cc-d2 is greater than or equal to 0.

Abstract translation: 一种分级折射率多模光纤，包括：（a）掺杂有氧化锗的二氧化硅芯，以及包含P2O5或F或B2O3之一的至少一种共掺杂物，所述芯延伸到最外芯半径r1并具有双重α， alpha1; （b）围绕所述芯并偏离所述芯的低折射率内包层; （c）包围并与内包层接触的外包层，使得至少从所述芯偏离的内包层的区域具有比外包层更低的折射率。 中心线CGe1处的中心锗浓度大于或等于0，核心CGe2在r1处的最外面的锗浓度大于或等于0.核心在中心线处具有中心共掺杂剂浓度 ，Cc-d1，大于或等于0，最外侧辅助掺杂浓度Cc-d2在r1处，其中Cc-d2大于或等于0。

公开(公告)号：US20130259426A1

公开(公告)日：2013-10-03

申请号：US13436286

申请日：2012-03-30

Applicant: Ming-Jun Li ,  Gaozhu Peng ,  Constantine Saravanos

Inventor： Ming-Jun Li ,  Gaozhu Peng ,  Constantine Saravanos

IPC: G02B6/38 ,  G02B6/028

CPC classification number: G02B6/02019 ,  G02B6/02038 ,  G02B6/421

Abstract: A single-mode optical fiber for use as a stub fiber in an optical fiber connector is disclosed. The optical fiber is configured minimize the adverse effects of multipath interference (MPI) that can arise in a short, single-mode conventional stub fiber that has a large group index difference. The optical fiber is also configured to have a mode-field diameter that is substantially the same as that of single-mode optical fibers intended for use as field fiber in a mechanical splice connector, along with a cutoff wavelength λC≦1200 nm. An optical fiber connector that uses the optical fiber as a stub fiber is also disclosed.

Abstract translation: 公开了用作光纤连接器中的短纤维的单模光纤。 配置光纤最小化在具有大的组折射率差异的短单模传统短纤维中可能出现的多径干扰（MPI）的不利影响。 光纤还被配置为具有与用于机械接头连接器中的场光纤的单模光纤的模场直径以及截止波长λC@ 1200nm基本相同的模场直径。 还公开了一种使用光纤作为短纤维的光纤连接器。

公开(公告)号：US08493556B2

公开(公告)日：2013-07-23

申请号：US13344065

申请日：2012-01-05

Applicant: Ming-Jun Li ,  Shenping Li ,  Xiaobin Wang

Inventor： Ming-Jun Li ,  Shenping Li ,  Xiaobin Wang

IPC: G01N21/00

CPC classification number: G01K11/32 ,  G01L1/246

Abstract: Some embodiments of a distributed Brillouin optical fiber sensing system employs a sensing optical fiber that supports two or more (i.e., few) guided modes. Pump light supported by one of the guided modes is used to form a dynamic Brillouin grating (DBG). Probe light supported by at least one of the other guided modes interacts with the DBG to form reflected probe light that is received and analyzed to determine a Brillouin frequency shift, a phase matching wavelength between probe and pump light, a reflection location, which in turn allows for making a measurement of at least one condition along the sensing optical fiber. Supporting the pump and probe light in different guided modes results in the optical fiber sensing system being able to simultaneously measure temperature and strain and having a higher spatial resolution than sensing systems where the pump light and probe light share a common guided mode.

Abstract translation: 分布式布里渊光纤感测系统的一些实施例采用支持两个或更多（即少数）导模的传感光纤。 由一个引导模式支持的泵浦光用于形成动态布里渊光栅（DBG）。 由其他引导模式中的至少一个支撑的探测光与DBG相互作用以形成被接收和分析的反射探测光，以确定布里渊频移，探针与泵浦光之间的相位匹配波长，反射位置 允许沿着感测光纤测量至少一个条件。 以不同的导向模式支持泵浦和探测光，导致光纤感测系统能够同时测量温度和应变，并且具有比泵浦光和探针光共享共同引导模式的感测系统更高的空间分辨率。