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    Frequency and amplitude modulated fiber spins for PMD reduction
    21.
    发明授权
    Frequency and amplitude modulated fiber spins for PMD reduction 失效
    用于PMD降低的频率和幅度调制光纤自旋

    公开(公告)号：US5943466A

    公开(公告)日：1999-08-24

    申请号：US784574

    申请日：1997-01-21

    Applicant: Danny L. Henderson ,  Ming-Jun Li ,  Daniel A. Nolan ,  Glenda R. Washburn

    Inventor： Danny L. Henderson ,  Ming-Jun Li ,  Daniel A. Nolan ,  Glenda R. Washburn

    IPC: G02B6/00 ,  C03B37/027 ,  C03B37/03 ,  G02B6/02 ,  G02B6/024

    CPC classification number: G02B6/02285 ,  C03B37/027 ,  C03B37/02745 ,  C03B37/03 ,  C03B37/032 ,  C03B2203/06 ,  C03B2203/18 ,  C03B2203/20 ,  C03B2203/36 ,  C03B2205/06

    Abstract: The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for which the beat lengths of the fibers, including the beat lengths of different portions of the fibers, are variable and thus not readily known in advance. The spin functions of the invention take advantage of certain resonances in energy transfer between polarization modes to achieve substantial reductions in PMD for a wide range of beat lengths. Examples of suitable spin functions include frequency-modulated and amplitude-modulated sine waves.

    Abstract translation: 本发明提供了通过根据具有足够的谐波含量的自旋函数在拉伸过程中纺丝纤维来实现单模光纤中的偏振模色散（PMD）的改进方法，以实现商业光纤的低水平的PMD， 包括纤维的不同部分的间隔的纤维是可变的，因此预先不容易知道。 本发明的自旋功能利用在极化模式之间的能量转移中的某些共振，以实现大范围的拍子长度的PMD的显着降低。 合适的自旋函数的实例包括频率调制和幅度调制的正弦波。

    System for converting programs and databases to correct year 2000 processing errors
    22.
    发明授权
    System for converting programs and databases to correct year 2000 processing errors 失效
    用于转换程序和数据库以纠正2000年处理错误的系统

    公开(公告)号：US5897633A

    公开(公告)日：1999-04-27

    申请号：US150005

    申请日：1998-09-09

    Applicant: Daniel A. Nolan

    Inventor： Daniel A. Nolan

    IPC: G06F9/44 ,  G06F17/30

    CPC classification number: G06F8/78 ,  Y10S707/99936 ,  Y10S707/99942 ,  Y10S707/99943

    Abstract: A method of modifying programs and databases having abbreviated date fields to achieve year 2000 compliancy includes examining an original database to ascertain the location of date fields, creating a supplementary PALM file that includes fully expanded date fields representative of corresponding date fields in the original database and modifying instructions or modules of the original program to access the PALM file for date information instead of the original database. The PALM file contains fully expanded date representations of abbreviated date fields of the original database. The PALM file also includes record identifiers and field identifiers to enable the modified program to access the required date information. Portions of the program requiring modification are identified by scanning for keywords that are generated from an examination of the database and/or from field layout definitions. The program is also examined for related keyword constructs or redefinitions found in the program itself. When converted, the modified program accesses the PALM file for date processing and accesses the original database for other processing steps. Further, a representative database having expanded date entries may be created based on examining a sample of an original database, and used by a modified legacy program to attain year 2000 compliancy.

    Abstract translation: 修改具有缩写日期字段的程序和数据库以达到2000年兼容性的方法包括检查原始数据库以确定日期字段的位置，创建补充PALM文件，其包括表示原始数据库中对应的日期字段的完全扩展的日期字段，以及 修改原始程序的指令或模块以访问PALM文件以获取日期信息，而不是原始数据库。 PALM文件包含原始数据库的缩写日期字段的完全扩展日期表示。 PALM文件还包括记录标识符和字段标识符，以使修改的程序能够访问所需的日期信息。 需要修改的程序的部分通过扫描从数据库的检查和/或从现场布局定义产生的关键字来识别。 该程序还会检查相关的关键字构造或在程序本身中找到的重新定义。 转换后，修改的程序访问PALM文件进行日期处理，并访问原始数据库以进行其他处理步骤。 此外，可以基于检查原始数据库的样本来创建具有扩展日期条目的代表性数据库，并且由经修改的遗留程序使用以获得2000年的符合性。

    System for converting programs and databases to correct year 2000 processing errors
    24.
    发明授权
    System for converting programs and databases to correct year 2000 processing errors 失效
    用于转换程序和数据库以纠正2000年处理错误的系统

    公开(公告)号：US5809500A

    公开(公告)日：1998-09-15

    申请号：US879613

    申请日：1997-06-20

    Applicant: Daniel A. Nolan

    Inventor： Daniel A. Nolan

    IPC: G06F9/44 ,  G06F17/30

    CPC classification number: G06F8/78 ,  Y10S707/99936 ,  Y10S707/99942 ,  Y10S707/99943

    Abstract: A method for processing or modifying programs and databases containing abbreviated date fields to achieve year 2000 compliancy includes examining an original database to ascertain the location of date fields, creating a supplementary PALM file that includes fully expanded date fields representative of corresponding date fields in the original database and modifying instructions or modules of the original program to access the PALM file for date information instead of the original database. The PALM file contains fully expanded date representations of abbreviated date fields of the original database. The PALM file also includes record identifiers and field identifiers to enable the modified program to access the required date information. Portions of the program requiring modification are identified by scanning for keywords that are generated from an examination of the database and/or from field layout definitions. The program is also examined for related keyword constructs or redefinitions found in the program itself. When converted, the modified program accesses the PALM file for date processing and accesses the original database for other processing steps. The method enables a computational system to determine the periods between dates in a non-ambiguous manner and yet advantageously uses the original database to retain system compatibility.

    Abstract translation: 用于处理或修改包含缩写日期字段的程序和数据库以达到2000年符合性的方法包括检查原始数据库以确定日期字段的位置，创建补充PALM文件，其中包括表示原始对应日期字段的完全扩展日期字段 数据库和修改原始程序的指令或模块，以访问PALM文件以获取日期信息，而不是原始数据库。 PALM文件包含原始数据库的缩写日期字段的完全扩展日期表示。 PALM文件还包括记录标识符和字段标识符，以使修改的程序能够访问所需的日期信息。 需要修改的程序的部分通过扫描从数据库的检查和/或从现场布局定义产生的关键字来识别。 该程序还会检查相关的关键字构造或在程序本身中找到的重新定义。 转换后，修改的程序访问PALM文件进行日期处理，并访问原始数据库以进行其他处理步骤。 该方法使得计算系统能够以非歧义的方式确定日期之间的周期，并且有利地使用原始数据库来保持系统兼容性。

    Low loss coupler
    25.
    发明授权
    Low loss coupler 失效
    低损耗耦合器

    公开(公告)号：US5339372A

    公开(公告)日：1994-08-16

    申请号：US75129

    申请日：1993-06-09

    Applicant: William J. Miller ,  Daniel A. Nolan ,  David L. Weidman

    Inventor： William J. Miller ,  Daniel A. Nolan ,  David L. Weidman

    IPC: G02B6/28 ,  C03C25/02

    CPC classification number: G02B6/2856

    Abstract: A low loss fiber optic coupler of the type wherein a plurality of single-mode optical fibers are fused together along a portion of the lengths thereof to form a coupling region. Each fiber includes a core and a cladding, the lowest refractive index of the fiber claddings being n.sub.2. Each of the output fibers of the coupler further includes a surface region of refractive index n.sub.4 that inhibits the coupling of light to lossy composite modes, n.sub.4 being lower than n.sub.2.

    Abstract translation: 一种低损耗光纤耦合器，其中多个单模光纤沿其长度的一部分熔合在一起以形成耦合区域。 每个光纤包括芯和包层，光纤包层的最低折射率为n2。 耦合器的每个输出光纤还包括折射率为n4的表面区域，其阻止光耦合到有损复合模式，n4低于n2。

    Environmentally stable monolithic Mach-Zehnder device
    26.
    发明授权
    Environmentally stable monolithic Mach-Zehnder device 失效
    环保的单片马赫 - 曾德设备

    公开(公告)号：US5295205A

    公开(公告)日：1994-03-15

    申请号：US38244

    申请日：1993-03-29

    Applicant: William J. Miller ,  Daniel A. Nolan

    Inventor： William J. Miller ,  Daniel A. Nolan

    IPC: G02B5/28 ,  G02B6/28 ,  G02B6/34 ,  G02B6/26

    CPC classification number: G02B6/29332 ,  G02B6/2835 ,  G02B6/29352

    Abstract: A monolithic, environmentally stable Mach-Zehnder device is formed by threading first and second dissimilar optical fibers through the bore of a glass tube. The tube is evacuated and heated to collapse it onto the fibers. The tube is further heated and stretched at two spaced locations to form two couplers that are joined by the two optical fibers. The fibers have different propagation constants in the region between the two couplers, whereby there is a relative delay in the optical signal propagating in one of the fibers with respect to the optical signal propagating in the other fiber.

    Abstract translation: 通过将第一和第二不同光纤穿过玻璃管的孔而形成整体式，环境稳定的马赫 - 策德尔装置。 将管抽真空并加热以使其折叠到纤维上。 将管进一步加热并在两个间隔位置拉伸以形成由两根光纤连接的两个耦合器。 纤维在两个耦合器之间的区域中具有不同的传播常数，由此相对于在另一个光纤中传播的光信号，光信号在一个光纤中传播的相对延迟。

    Directing glass forming constituents against a lateral surface parallel to the axis of rotation of a starting member to form a monolithic blank for an optical waveguide
    27.
    发明授权
    Directing glass forming constituents against a lateral surface parallel to the axis of rotation of a starting member to form a monolithic blank for an optical waveguide 失效
    将玻璃形成成分导向平行于起始构件的旋转轴线的侧表面，以形成用于光波导的单片坯料

    公开(公告)号：US4204851A

    公开(公告)日：1980-05-27

    申请号：US840242

    申请日：1977-10-07

    Applicant: Daniel A. Nolan

    Inventor： Daniel A. Nolan

    IPC: C03B37/014 ,  G02B6/02 ,  C03B37/00

    CPC classification number: C03B37/0142 ,  C03B37/01486 ,  C03B2203/20 ,  C03B2203/32 ,  C03B2203/34 ,  C03B2207/02 ,  C03B2207/66 ,  C03B2207/70 ,  G02B2006/0209

    Abstract: A hydrolyzing flame technique is used to build up glass soots of at least two different compositions upon a rotating starting member. The process is repeated until the soots define at least one helically-oriented body of soot of one composition completely enveloped by a soot of a second composition. The soot-covered starting member is then subjected to heat to fuse it whereupon the soots are fused into compositions exhibiting different indices of refraction. The member can then be drawn into a elongate structure comprising an optical waveguide extending helically through the body of the structure.

    Abstract translation: 水解火焰技术用于在旋转的起始构件上建立至少两种不同组成的玻璃烟炱。 重复该过程，直到烟炱定义由第二组合物的烟灰完全包围的一种组合物的至少一个螺旋取向的烟灰体。 然后对烟灰覆盖的起始构件进行加热以使其熔化，由此将烟灰熔化成具有不同折射率的组合物。 然后可以将构件拉成细长结构，其包括螺旋延伸穿过结构体的光波导。

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