公开(公告)号：US06768849B2

公开(公告)日：2004-07-27

申请号：US10190134

申请日：2002-07-03

申请人： David John DiGiovanni ,  Andrew D. Yablon ,  Man Fei Yan

发明人： David John DiGiovanni ,  Andrew D. Yablon ,  Man Fei Yan

IPC分类号： G02B602

CPC分类号： G02B6/02123 ,  C03B37/027 ,  C03B37/15 ,  C03B2201/02 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/222 ,  C03B2205/40 ,  G02B6/02 ,  G02B6/02071 ,  G02B6/2551 ,  G02B6/2552

摘要： Systems and methods are described for fabricating a varying-waveguide optical fiber. In one described method, a preform is fabricated having a core and at least one cladding region. The cladding region has a higher viscosity and the core region has a lower viscosity. The relative viscosities of the cladding region and core are chosen such that, when tension is applied to an optical fiber drawn from the preform, the applied tension is primarily borne by the cladding region thereby causing a viscoelastic strain to be frozen into the cladding region, while creating a minimal viscoelastic strain in the core. The method further includes drawing the preform into an optical fiber under an applied tension, such that a viscoelastic strain is frozen into the cladding region the frozen-in viscoelastic strain decreasing the cladding region refractive index. The cladding region refractive index is changed in a section of the optical fiber by heating the section so as to relax the viscoelastic strain frozen into the cladding region in the section of fiber, thereby increasing the cladding region refractive index in the section of fiber.

摘要翻译： 描述了制造变波导光纤的系统和方法。 在一种所描述的方法中，制造具有芯和至少一个包层区的预成型件。 包层区域具有较高的粘度，并且核心区域具有较低的粘度。 选择包层区域和芯体的相对粘度，使得当对从预成型体拉出的光纤施加张力时，施加的张力主要由包层区域承担，从而使粘弹性应变冻结在包层区域中， 同时在核心中产生最小的粘弹性应变。 该方法还包括在施加的张力下将预型件拉伸成光纤，使得粘弹性应变被冻结到包层区域中，使冷冻的粘弹性应变降低包层区折射率。 通过加热该部分使包层区折射率变化，使得在纤维截面中冻结到包层区域的粘弹性应变松弛，从而增加纤维截面中的包层区折射率。

公开(公告)号：US06654522B2

公开(公告)日：2003-11-25

申请号：US10128622

申请日：2002-04-23

申请人： Juhi Chandalia ,  David John DiGiovanni ,  Benjamin John Eggleton ,  Sandra Greenberg Kosinski ,  Robert Scott Windeler

发明人： Juhi Chandalia ,  David John DiGiovanni ,  Benjamin John Eggleton ,  Sandra Greenberg Kosinski ,  Robert Scott Windeler

IPC分类号： G02B626

CPC分类号： G02B6/02361 ,  G02B6/02366 ,  G02B6/02371 ,  G02B6/02376 ,  G02B6/14 ,  G02B6/2552

摘要： The invention involves providing a microstructured fiber having a core region, a cladding region, and one or more axially oriented elements (e.g., capillary air holes) in the cladding region. A portion of the microstructured fiber is then treated, e.g., by heating and stretching the fiber, such that at least one feature of the fiber microstructure is modified along the propagation direction, e.g., the outer diameter of the fiber gets smaller, the axially oriented elements get smaller, or the axially oriented elements collapse. The treatment is selected to provide a resultant fiber length that exhibits particular properties, e.g., mode contraction leading to soliton generation, or mode expansion. Advantageously, the overall fiber length is designed to readily couple to a standard transmission fiber, i.e., the core sizes at the ends of the length are similar to a standard fiber, which allows efficient coupling of light into the microstructured fiber length.

公开(公告)号：US06422043B1

公开(公告)日：2002-07-23

申请号：US09440763

申请日：1999-11-16

申请人： David John DiGiovanni ,  Steven Eugene Golowich ,  Sean L. Jones ,  William Alfred Reed

发明人： David John DiGiovanni ,  Steven Eugene Golowich ,  Sean L. Jones ,  William Alfred Reed

IPC分类号： C03B37075

CPC分类号： C03B37/02745 ,  C03B37/01228 ,  C03B37/01869 ,  C03B37/027 ,  C03B2203/19 ,  C03B2205/06 ,  G02B6/02 ,  G02B6/02052 ,  G02B6/02285 ,  G02B6/0288 ,  G02B2006/0209 ,  Y02P40/57

摘要： Our method of making high bandwidth silica-based multimode optical fiber comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular preform under reduced pressure during at least part of the collapse, resulting in a non-circular core and cladding. It can also be made by removal (e.g., by grinding or plasma etching) of appropriate portions of the preform, resulting in a circular core and non-circular cladding. In the latter case, fiber is drawn at a relatively high temperature such that, due to surface tension, the cladding assumes substantially circular shape and the core assumes a non-circular shape. The chiral structure is imposed on the fiber in any appropriate way, e.g., by twisting during fiber drawing the fiber alternately in clockwise and couterclockwise sense relative to the preform.

摘要翻译： 我们制造高带宽二氧化硅的多模光纤的方法包括提供非圆形预成型件，以及从预型件中拉伸手性结构的纤维。 非圆形预成型件可以通过在至少部分塌缩期间通过在减压下保持管状预成型件的内部而形成，从而形成非圆形的芯和包层。 还可以通过去除（例如，通过研磨或等离子体蚀刻）预成型件的适当部分来制造，从而形成圆形芯和非圆形包层。 在后一种情况下，纤维在比较高的温度下被拉伸，使得由于表面张力，包层呈现大致圆形并且芯呈现非圆形形状。 手性结构以任何适当的方式施加在纤维上，例如通过在纤维中以相对于预成型件顺时针和逆时针方向交替地纤维拉伸而进行扭转。

公开(公告)号：US5868815A

公开(公告)日：1999-02-09

申请号：US803476

申请日：1997-02-20

申请人： David John DiGiovanni ,  Steven Alan Jacobs ,  Man Fei Yan

发明人： David John DiGiovanni ,  Steven Alan Jacobs ,  Man Fei Yan

IPC分类号： G02B6/00 ,  C03B37/012 ,  C03B37/018 ,  C03B37/07

CPC分类号： C03B37/01257 ,  C03B37/01869

摘要： The specification describes a process and apparatus for monitoring and controlling the ellipticity of preform tubes during Modified Chemical Vapor Deposition. In response to computer generated signals from the monitoring device, the tube collapse rate is adjusted dynamically by locally changing the temperature of the glass tube, or by changing the physical force acting to collapse the tube.

摘要翻译： 本说明书描述了用于在改进的化学气相沉积期间监测和控制预成型管的椭圆率的方法和装置。 响应于来自监测装置的计算机产生的信号，通过局部改变玻璃管的温度或通过改变用于使管塌缩的物理力来动态地调节管塌陷率。

公开(公告)号：US5802236A

公开(公告)日：1998-09-01

申请号：US799311

申请日：1997-02-14

申请人： David John DiGiovanni ,  Ashish Madhukar Vengsarkar ,  Jefferson Lynn Wagener ,  Robert Scott Windeler

发明人： David John DiGiovanni ,  Ashish Madhukar Vengsarkar ,  Jefferson Lynn Wagener ,  Robert Scott Windeler

IPC分类号： C03B37/012 ,  C03B37/027 ,  G02B6/02 ,  G02B6/036 ,  H01S3/067 ,  G02B6/22

CPC分类号： G02B6/023 ,  B82Y20/00 ,  C03B37/0122 ,  C03B37/027 ,  G02B6/02028 ,  G02B6/02261 ,  G02B6/0228 ,  G02B6/02333 ,  G02B6/02338 ,  G02B6/02347 ,  G02B6/02357 ,  G02B6/02361 ,  C03B2201/34 ,  C03B2203/14 ,  C03B2203/36 ,  C03B2203/42 ,  G02B6/021 ,  G02B6/02366 ,  H01S3/06708

摘要： Disclosed are non-periodic microstructured optical fibers that guide radiation by index guiding. By appropriate choice of core region and cladding region, the effective refractive index difference .DELTA. between core region and cladding can be made large, typically greater than 5% or even 10 or 20%. Such high .DELTA. results in small mode field diameter of the fundamental guided mode (typically

摘要翻译： 公开了通过指数引导引导辐射的非周期性微结构光纤。 通过适当选择纤芯区域和包层区域，可以使芯区域和包层之间的有效折射率差ΔTA大，通常大于5％甚至10％或20％。 这种高DELTA导致基本导模（通常<2.5μm）的小模场直径，并且因此导致芯区域中的高辐射强度。 示例性地，根据本发明的纤维具有由内包层区域和外包层区域包围的固体二氧化硅芯区域。 包层区域具有在轴向纤维方向上延伸的毛细孔隙，外包层区域中的空隙具有比内包层区域更大的直径，使得外包层区域的有效折射率大于 内包层区域。 非周期性微结构纤维潜在地具有许多用途，例如作为色散补偿光纤（具有或不具有色散斜率补偿），作为放大光纤，激光器，可饱和吸收器，光纤光栅和非线性元件。 还公开了制造微结构纤维的方法。

公开(公告)号：US5708669A

公开(公告)日：1998-01-13

申请号：US719278

申请日：1996-09-24

申请人： David John DiGiovanni ,  Ashish Madhukar Vengsarkar

发明人： David John DiGiovanni ,  Ashish Madhukar Vengsarkar

IPC分类号： G02B6/00 ,  G02B6/02 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/105

CPC分类号： H01S3/094003 ,  H01S3/06708 ,  H01S3/0675 ,  H01S3/06729 ,  H01S3/094007

摘要： A cladding pumped optical fiber laser comprises a length of optical fiber having a rare earth-doped region of diameter d.sub.RE >d.sub.01 where d.sub.01 is the mode diameter of the LP.sub.01 mode of the fiber at the laser radiation at wavelength .lambda.. In one embodiment the fiber has a core diameter d.sub.c selected such that the LP.sub.01 mode is the only guided spatial mode of the fiber, and d.sub.RE is greater than d.sub.c. In another embodiment the fiber supports at least one higher order guided spatial mode, typically LP.sub.11 or LP.sub.02, and d.sub.RE is approximately equal to or larger than d.sub.c. Currently preferred embodiments comprise a grating-defined laser cavity that comprises a mode-coupling refractive index grating. Cladding pumped lasers according to the invention will typically have efficient conversion of pump radiation to laser radiation, and consequently can typically be shorter than analogous prior art cladding pumped lasers.

摘要翻译： 包层泵浦光纤激光器包括具有直径d RE> d01的稀土掺杂区域的一段长度的光纤，其中d01是在波长λ的激光辐射下光纤的LP01模式的模式直径。 在一个实施例中，光纤具有选择的芯直径dc，使得LP01模式是光纤的唯一引导空间模式，并且d RE大于dc。 在另一个实施例中，光纤支持至少一个较高阶导向空间模式，通常为LP11或LP02，dRE大约等于或大于dc。 目前优选的实施例包括光栅限定的激光腔，其包括模耦合折射率光栅。 根据本发明的包层泵浦激光器通常将有效地将泵浦辐射转换成激光辐射，因此通常可以比现有技术的包层泵浦激光器更短。

公开(公告)号：US5703978A

公开(公告)日：1997-12-30

申请号：US695180

申请日：1996-08-01

申请人： David John DiGiovanni ,  Justin Boyd Judkins ,  Janet Renee Pedrazzani ,  Ashish Madhukar Vengsarkar ,  Kenneth Lee Walker

发明人： David John DiGiovanni ,  Justin Boyd Judkins ,  Janet Renee Pedrazzani ,  Ashish Madhukar Vengsarkar ,  Kenneth Lee Walker

IPC分类号： G02B6/00 ,  G02B6/02 ,  H01S3/067 ,  H01S3/10 ,  G02B6/34 ,  H01S3/30 ,  H04J14/02

CPC分类号： G02B6/0219 ,  G02B6/02095 ,  H01S3/10023 ,  H01S2301/04 ,  H01S3/0675

摘要： Applicants have determined that the temperature sensitivity of long-period grating devices is due to differential variation with temperature of the refractive indices of the core and cladding. They have further determined that the cladding profile and fiber composition can be redesigned to substantially reduce this differential variation, thereby reducing the temperature sensitivity of long-period gratings of less than 4 nm per 100.degree. C. and preferably less than 2 nm per 100.degree. C. This design permits the use of long-period grating devices without temperature control or compensation.

摘要翻译： 申请人已经确定长周期光栅器件的温度敏感性是由于芯和包层的折射率的温度的差异变化。 他们进一步确定，可以重新设计包层分布和纤维组成以显着降低该差异变化，从而降低每100℃小于4nm，优选小于2nm / 100°的长周期光栅的温度敏感性。 C.此设计允许使用长周期光栅器件，无需温度控制或补偿。