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    OPTICAL FIBER COMMUNICATION SYSTEM
    11.
    发明专利
    OPTICAL FIBER COMMUNICATION SYSTEM 失效

    公开(公告)号：JPH1062646A

    公开(公告)日：1998-03-06

    申请号：JP11553497

    申请日：1997-05-06

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： NELSON KATHERINE THERESA ,  REED WILLIAM ALFRED ,  WALKER KENNETH LEE ,  WHITE IAN ARTHUR

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

    Abstract: PROBLEM TO BE SOLVED: To realize an optical fiber communication system by which even the function not available hitherto because of deficient cost efficiency can be provided, by utilizing fiber filters simply and at low cost, so that the cost of the system can be reduced. SOLUTION: An optical fiber communication system is provided with a first radiation source 41 of a first wavelength λ1 , a utilization means of the radiation source such as a receiver 46, first optical fiber transmission passages 44, 48 for connecting the first radiation source 41 with the utilization means 46, a second radiation source 42 of a second wavelength λ , a utilization means 47 of the radiation source of the second wavelength, and second optical fiber transmission passages 44, 49 for connecting the second radiation source 42 with the utilization means 47. The first part 44 of the first optical fiber transmission passages 44, 48 is included in the second optical fiber transmission passage. The system is further provided with an optical filter 48 that ejects nearly all the radiation of the second wavelength from the second part of the first optical fiber transmission passages 44, 48.

    Microstructure optical fibers for dispersion management in optical communication systems
    12.
    发明授权
    Microstructure optical fibers for dispersion management in optical communication systems 失效
    用于光通信系统中色散管理的微结构光纤

    公开(公告)号：US6393178B2

    公开(公告)日：2002-05-21

    申请号：US77369601

    申请日：2001-02-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： RANKA JINENDRA KUMAR ,  REED WILLIAM ALFRED ,  WINDELER ROBERT SCOTT

    IPC: G02B6/036 ,  G02B6/02 ,  G02B6/032 ,  G02B6/26 ,  H04B10/00 ,  H04B10/12

    CPC classification number: G02B6/02366 ,  B82Y20/00 ,  G02B6/02266 ,  G02B6/29377

    Abstract: A fiber optic system comprises an optical transmitter, an optical receiver, and an optical fiber transmission path that optically couples the transmitter and the receiver to one another. The transmission path includes a first section that has negative dispersion at an operating wavelength lambd0 greater than about 1300 nm and a second section that includes a MOF. The MOF has relatively large anomalous dispersion at lambd0 and is sufficiently long to compensate the accumulated negative dispersion in the first section. In one embodiment the MOF comprises a core, a lower index cladding that includes one or more layers of air holes surrounding the core, characterized in that the diameter of the core is less than about 8 mum and the difference in effective refractive index between the core and cladding is greater than about 0.1 (10%). Preferably, the cladding contains no more than 2 layers of air holes and the distance between the nearest edges of adjacent air holes is less than about 1 mum.

    Abstract translation: 光纤系统包括光发射机，光接收机和将发射机和接收机彼此光耦合的光纤传输路径。 传输路径包括在大于约1300nm的工作波长lambd0处具有负色散的第一部分和包括MOF的第二部分。 MOF在lambd0处具有相对较大的异常色散，并且足够长以补偿第一部分中的累积负色散。 在一个实施例中，MOF包括芯，低折射率包层，其包括围绕芯的一层或多层空气孔，其特征在于，芯的直径小于约8μm，并且芯的有效折射率差 并且包层大于约0.1（10％）。 优选地，包层包含不超过2层的气孔，并且相邻气孔的最近边缘之间的距离小于约1um。

    14.
    发明专利
    未知

    公开(公告)号：DE69900082T2

    公开(公告)日：2001-11-15

    申请号：DE69900082

    申请日：1999-02-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： LEGRANGE JANE DEBORAH ,  WALKER KENNETH LEE ,  REED WILLIAM ALFRED

    IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/08 ,  H01S3/30 ,  H04B10/17

    Abstract: The performance of optical fiber Raman devices can be increased by substitution of a broadband reflector (typically a multilayer dielectric mirror) for some of the narrowband reflectors (typically fiber Bragg gratings) that are conventionally used to define the optical cavities of the device. The device exemplarily is a Raman laser or amplifier, and in preferred embodiments a broadband reflector reflects all the Stokesshifted wavelengths, such that the cavities are defined by the single broadband reflector and by a multiplicity of appropriately selected narrowband reflectors. Optionally the broadband reflector also serves to reflect the pump radiation.

    RAMAN AMPLIFIED OPTICAL SYSTEM WITH REDUCTION OF FOUR-WAVE MIXING EFFECTS
    15.
    发明专利
    RAMAN AMPLIFIED OPTICAL SYSTEM WITH REDUCTION OF FOUR-WAVE MIXING EFFECTS 未知

    公开(公告)号：CA2335891A1

    公开(公告)日：2001-09-03

    申请号：CA2335891

    申请日：2001-02-13

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： STENTZ ANDREW JOHN ,  REED WILLIAM ALFRED ,  PARK SEO Y ,  LEE ROBERT B ,  HANSEN PER BANG

    IPC: H01S3/30 ,  H04B10/17 ,  H04B10/18 ,  G02F1/39

    Abstract: A transmission fiber for use in a Raman amplified optical communication system is formed to exhibit certain characteristics that limit modulation instability and four-wave mixing in the amplification region, thus reducing the noise component present in the transmission system. In particular, the group-velocity dispersion (denoted as D and measured in terms of ps/nm-km) is restricted to be either non- positive or greater than +1.5ps/nm-km in the pump wavelength range of interest (a typica l pump wavelength range being 1430-1465nm). Preferably, the magnitude of the dispersion is kept below a value of 10 ps/nm-km in the signal wavelength range of interest (e.g., the "C" band or "L" band). Four-wave mixing is reduced by ensuring that the zero - dispersion frequency of the transmission fiber is not centered between the pump frequency and a frequency experiencing Raman gain.

    METHOD OF MAKING AN IMPROVED MULTIMODE OPTICAL FIBER AND FIBER MADE BY METHOD
    16.
    发明专利
    METHOD OF MAKING AN IMPROVED MULTIMODE OPTICAL FIBER AND FIBER MADE BY METHOD 未知

    公开(公告)号：CA2323351A1

    公开(公告)日：2001-05-16

    申请号：CA2323351

    申请日：2000-10-17

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： REED WILLIAM ALFRED ,  JONES SEAN L ,  GOLOWICH STEVEN EUGENE ,  DIGIOVANNI DAVID JOHN

    IPC: C03B37/01 ,  C03B37/012 ,  C03B37/018 ,  C03B37/027 ,  C03B37/075 ,  G02B6/02 ,  G02B6/028 ,  G02B6/18

    Abstract: Our method of making high bandwidth silica-based multimode optical fibe r 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 remova l (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.

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