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    Communication system comprising a low cost optical filter
    2.
    发明授权
    Communication system comprising a low cost optical filter 失效
    包括低成本光学滤波器的通信系统

    公开(公告)号：US5673342A

    公开(公告)日：1997-09-30

    申请号：US654499

    申请日：1996-05-28

    申请人： Katherine Theresa Nelson ,  William Alfred Reed ,  Kenneth Lee Walker ,  Ian Arthur White

    发明人： Katherine Theresa Nelson ,  William Alfred Reed ,  Kenneth Lee Walker ,  Ian Arthur White

    IPC分类号： G02B6/036 ,  G02B6/00 ,  G02B6/02 ,  G02B6/26 ,  G02B6/293 ,  G02B6/34 ,  G02B6/42 ,  H04B10/00 ,  H04B10/08 ,  H04B10/22 ,  H04B10/24

    CPC分类号： G02B6/03627 ,  G02B6/02 ,  G02B6/266 ,  G02B6/03611 ,  G02B6/29368 ,  G02B6/4246

    摘要： An optical fiber communication system according to the invention comprises an optical fiber filter that can be manufactured at low cost and that can be conveniently incorporated into the system, substantially like a conventional fiber jumper. The filter comprises a length L of axially uniform optical fiber selected to have substantially no loss (e.g., 20 dB) at a wavelength .lambda..sub.2. The length L will typically be less than 100 m. In one embodiment the optical fiber is a single mode optical fiber at .lambda..sub.1 (e.g., 1.3 .mu.m) that does not have a guided mode at .lambda..sub.2 (e.g., 1.55 .mu.m). In another embodiment the fiber contains a dopant that does substantially not absorb radiation of wavelength .lambda..sub.1, but substantially absorbs at .lambda..sub.2. In the second embodiment, .lambda..sub.1 can be greater than .lambda..sub.2. Fiber filters according to the invention can be advantageously used in a variety of communication systems, and exemplary systems are disclosed.

    摘要翻译： 根据本发明的光纤通信系统包括可以以低成本制造并且可以方便地并入系统中的光纤滤波器，基本上像传统的光纤跳线一样。 滤波器包括长度为L的轴向均匀的光纤，其被选择为在波长λ1处基本上没有损耗（例如，<1dB），并且在波长λ2处具有相对高的损耗（例如，> 20dB）。 长度L通常将小于100米。 在一个实施例中，光纤是在λ1（例如，1.55μm）处不具有引导模式的λ1（例如，1.3μm）的单模光纤。 在另一个实施方案中，纤维包含基本上不吸收波长λ1的辐射但基本上以λ2吸收的掺杂剂。在第二实施方案中，λ1可以大于λ2.根据本发明的纤维过滤器可以有利地使用 在各种通信系统中，公开了示例性系统。

    Optical fiber communication system incorporating automatic dispersion compensation modules to compensate for temperature induced variations
    3.
    发明授权
    Optical fiber communication system incorporating automatic dispersion compensation modules to compensate for temperature induced variations 有权
    包含自动色散补偿模块的光纤通信系统，以补偿温度变化

    公开(公告)号：US06307988B1

    公开(公告)日：2001-10-23

    申请号：US09362151

    申请日：1999-07-28

    申请人： Benjamin John Eggleton ,  John A. Rogers ,  Thomas Andrew Strasser ,  Kenneth Lee Walker

    发明人： Benjamin John Eggleton ,  John A. Rogers ,  Thomas Andrew Strasser ,  Kenneth Lee Walker

    IPC分类号： G02B634

    CPC分类号： H04B10/2519 ,  H04B2210/252

    摘要： A high speed optical communication system (≧10 Gbit/s) is compensated for temperature variation by providing it with one or more automatic dispersion compensation modules. Each module has an adjustable dispersion element, a data integrity monitor and a feedback network whereby the monitor adjusts the dispersion element to compensate for temperature variation. In a preferred embodiment the dispersion compensating modules comprise chirped fiber Bragg gratings in which the chirp is induced in the grating by passing a current along distributed thin film heaters deposited along the length of the fiber. The magnitude of the applied current determines the dispersion of the grating. A data integrity monitor is configured to sense the integrity of transmitted data and to provide electrical feedback for controlling the current applied to the grating.

    摘要翻译： 高速光通信系统（> = 10 Gbit / s）通过提供一个或多个自动色散补偿模块来补偿温度变化。 每个模块具有可调色散元件，数据完整性监视器和反馈网络，由此监视器调节色散元件以补偿温度变化。 在优选实施例中，色散补偿模块包括啁啾光纤布拉格光栅，其中通过沿沿着光纤长度沉积的分布式薄膜加热器传递电流而在光栅中感应啁啾。 施加电流的大小决定了光栅的色散。 数据完整性监视器被配置为感测传输数据的完整性，并提供用于控制施加到光栅的电流的电反馈。

    Magnetically controlled variable optical attenuator
    4.
    发明授权
    Magnetically controlled variable optical attenuator 失效
    磁控可变光衰减器

    公开(公告)号：US6085016A

    公开(公告)日：2000-07-04

    申请号：US97549

    申请日：1998-06-15

    申请人： Rolando Patricio Espindola ,  Sungho Jin ,  Hareesh Mavoori ,  Kenneth Lee Walker

    发明人： Rolando Patricio Espindola ,  Sungho Jin ,  Hareesh Mavoori ,  Kenneth Lee Walker

    IPC分类号： G02B6/26 ,  G02B6/00

    CPC分类号： G02B6/266

    摘要： Magnets are used to control the amount of coupling loss between fibers. The fiber ends are attached to magnets and by controllably magnetizing the magnets, the fibers can be pulled apart or brought closer together to vary the amount of coupling loss. Preferably at least one of the magnets is latchable. The advantage of the latchable version is that a predetermined amount of loss can be latchably set by magnetizing the magnets to a particular level and afterwards no additional power is required to maintain the amount of attenuation. This is advantageous compared to other approaches in which power is required continuously to maintain a particular loss level.

    摘要翻译： 磁铁用于控制纤维之间的耦合损耗。 光纤端部附着在磁体上，并通过可控制地磁化磁体，可以将光纤拉开或靠近在一起以改变耦合损耗。 优选地，至少一个磁体是可锁定的。 可锁定版本的优点是可以通过将磁体磁化到特定水平来锁定预定量的损耗，然后不需要额外的功率来保持衰减量。 与其中需要连续维持功率以维持特定损耗水平的其它方法相比，这是有利的。

    Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness
    5.
    发明授权
    Method of making a large MCVD single mode fiber preform by varying internal pressure to control preform straightness 失效
    通过改变内部压力来制造大型MCVD单模纤维预成型件以控制预成型件直线度的方法

    公开(公告)号：US6105396A

    公开(公告)日：2000-08-22

    申请号：US115783

    申请日：1998-07-14

    申请人： Paul Francis Glodis ,  Charles Francis Gridley ,  Donald Paul Jablonowski ,  David Kalish ,  Kenneth Lee Walker

    发明人： Paul Francis Glodis ,  Charles Francis Gridley ,  Donald Paul Jablonowski ,  David Kalish ,  Kenneth Lee Walker

    IPC分类号： C03C3/04 ,  C03B37/012 ,  C03B37/018 ,  C03B37/027

    CPC分类号： C03B37/01211 ,  C03B37/01869 ,  C03B37/01884 ,  C03B37/01892 ,  C03B2201/02 ,  C03B2201/04 ,  C03B2201/075 ,  C03B2203/24

    摘要： A large optical preform 303 is made by a modified chemical vapor deposition (MCVD) process by depositing successive layers of core and cladding materials onto the inside surface of a rotating glass tube 33 having a hydroxyl ion (OH.sup.-) level that is less than 0.5 parts per million (ppm) by weight. The tube is then collapsed inwardly to form a core rod 301 in which the deposited core material 31 has a diameter that is greater than about 5 millimeters and the deposited cladding material 32 has an outside diameter that is less than about 15 millimeters. A machine-vision system 140, 150, 160 monitors and controls the diameter of the glass tube by regulating the pressure within the tube. Moreover, the machine-vision system monitors and controls the straightness of the tube by varying its rotational speed according to angular position. After the core rod 301 is formed, it is plasma etched to remove contaminants, and then overclad with two glass jackets 34, 35 having a hydroxyl ion (OH.sup.-) level that is less than 1.0 ppm by weight to create a large preform 303 from which about 400 kilometers of singlemode optical fiber can be drawn per meter of length.

    摘要翻译： 通过改进的化学气相沉积（MCVD）工艺，通过将核心和包层材料的连续层沉积到具有小于0.5的羟基离子（OH-）水平的旋转玻璃管33的内表面上来制造大型光学预成型件303 百万分之几（ppm）（重量）。 管然后向内折叠以形成芯棒301，其中沉积的芯材料31具有大于约5毫米的直径，并且沉积的包层材料32具有小于约15毫米的外径。 机器视觉系统140,150,160通过调节管内的压力来监视和控制玻璃管的直径。 此外，机器视觉系统通过根据角度位置改变其转速来监测和控制管的平直度。 在形成芯棒301之后，将其等离子体蚀刻以除去污染物，然后用两个小于1.0重量ppm的羟基离子（OH-）水平的两个玻璃外套34,35包覆，以从 每米长度可以绘制约400公里的单模光纤。

    Power and wavelength management for mixed-rate optical data systems
    10.
    发明授权
    Power and wavelength management for mixed-rate optical data systems 有权
    混合光学数据系统的功率和波长管理

    公开(公告)号：US06580536B1

    公开(公告)日：2003-06-17

    申请号：US09231033

    申请日：1999-01-14

    申请人： Andrew Roman Chraplyvy ,  Kenneth Lee Walker

    发明人： Andrew Roman Chraplyvy ,  Kenneth Lee Walker

    IPC分类号： H04J1402

    CPC分类号： H04J14/0221

    摘要： An optical transmission system exploits the reduced signal-to-noise (SNR) requirements for low-bit rate channels to devise a new wavelength channel allocation scheme which increases the number of channels that a WDM system can support. Wavelengths of low-bit rate channels are assigned outside a flat-gain window (i.e., flat-passband region) of the system. The channel allocation scheme uses the high-bit rate channels located in the flat-passband region of wavelengths and the lower-bit rate channels located outside this passband region with progressively lower-bit rate channels located farther outside this passband region. Low-bit rate channels are also assigned to region(s) of the passband where the non-linear threshold power level of the system may be exceeded.

    摘要翻译： 光传输系统利用低比特率信道的降低的信噪比（SNR）要求来设计一种增加WDM系统可以支持的信道数量的新的波长信道分配方案。 低比特率信道的波长被分配在系统的平坦增益窗口（即，平坦通带区域）之外。 信道分配方案使用位于波长的平坦通带区域中的高比特率信道和位于该通带区域外部的低位比特率信道，其中位于该通带区域之外的逐渐降低的比特率信道。 低比特率信道也被分配给可能超过系统的非线性阈值功率电平的通带的区域。