中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

26 records (took 0.046 seconds)

    RAMAN AMPLIFIED OPTICAL SYSTEM WITH REDUCTION OF FOUR-WAVE MIXING EFFECTS
    2.
    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.

    4.
    发明专利
    未知

    公开(公告)号：DE69700572T2

    公开(公告)日：2000-05-25

    申请号：DE69700572

    申请日：1997-02-04

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： GRUBB STEPHEN GREGORY ,  WALKER KENNETH LEE ,  STENTZ ANDREW JOHN

    IPC: G02F1/35 ,  H01S3/067 ,  H01S3/094 ,  H01S3/30 ,  H04B10/17

    Abstract: A low noise optical fiber Raman amplifier (FRA) comprises an upstream and a downstream length (23, 24) of silica-based amplifier fiber, of combined length >200 m, typically >1 km, with an optical isolator (25) disposed between the upstream and downstream lengths of amplifier fiber such that passage of backscattered signal radiation from the latter to the former is substantially blocked. In preferred embodiments counter-propagating pump radiation is coupled into the downstream length of amplifier fiber, and wavelength-selective means (26, 27) are provided for shunting the pump radiation around the optical isolator. The described FRA is advantageously incorporated into optical fiber communication systems. Exemplarily it can serve as power amplifier, as pre-amplifier, or as in-line amplifier. For instance, it can be used to replace conventional opto-electronic repeaters in existing 1.3 mu m fiber communication systems, or it can be used as power amplifier in a multi-subscriber optical fiber CATV system. In a still further exemplary embodiment, the FRA is used as a distributed pre-amplifier in a remotely pumped fiber communication system.

    5.
    发明专利
    未知

    公开(公告)号：DE60036989T2

    公开(公告)日：2008-08-28

    申请号：DE60036989

    申请日：2000-07-31

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： RANKA JINENDRA KUMAR ,  STENTZ ANDREW JOHN

    IPC: G02F1/35 ,  H04B10/17 ,  G02F1/365 ,  G02F2/00 ,  H01S3/06 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    Abstract: The present invention uses wavelength conversion to increase the bandwidth of optical communication systems. In an exemplary embodiment, a combination of wavelength conversion and amplification with a discrete optical amplifier (OA) to allow communications systems to operate in wavelength bands lambda ' outside the gain bandwidth of the OA. A transmitter launches signal channels ( lambda 1', lambda 2',..., lambda 'N) that are outside the gain bandwidth lambda . A wavelength conversion device upstream of the amplifier maps channels lambda '1, lambda '2,... lambda 'N to corresponding wavelengths lambda 1, lambda 2, ... lambda N within lambda . The OA directly amplifies the converted signals and a second wavelength conversion device downstream of the amplifier maps the amplified signals back to the original channels lambda '1, lambda '2,... lambda 'N. This increases the capacity of the optical communication systems by facilitating the use of both signals that lie within the OA gain bandwidth lambda and signals that can be converted to wavelengths within lambda . Associated wavelength converters, transmitters and receivers are also described. This approach applies not only to the use of EDFAs, but also to gain-flattening elements, dispersion-compensating fibers, variable attenuators, and any intermediate components having bandwidths smaller than the transmission fiber.

    6.
    发明专利
    未知

    公开(公告)号：DE60036989D1

    公开(公告)日：2007-12-20

    申请号：DE60036989

    申请日：2000-07-31

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： RANKA JINENDRA KUMAR ,  STENTZ ANDREW JOHN

    IPC: G02F1/35 ,  H04B10/17 ,  G02F1/365 ,  G02F2/00 ,  H01S3/06 ,  H01S3/10 ,  H01S3/30 ,  H04B10/02 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    Abstract: The present invention uses wavelength conversion to increase the bandwidth of optical communication systems. In an exemplary embodiment, a combination of wavelength conversion and amplification with a discrete optical amplifier (OA) to allow communications systems to operate in wavelength bands lambda ' outside the gain bandwidth of the OA. A transmitter launches signal channels ( lambda 1', lambda 2',..., lambda 'N) that are outside the gain bandwidth lambda . A wavelength conversion device upstream of the amplifier maps channels lambda '1, lambda '2,... lambda 'N to corresponding wavelengths lambda 1, lambda 2, ... lambda N within lambda . The OA directly amplifies the converted signals and a second wavelength conversion device downstream of the amplifier maps the amplified signals back to the original channels lambda '1, lambda '2,... lambda 'N. This increases the capacity of the optical communication systems by facilitating the use of both signals that lie within the OA gain bandwidth lambda and signals that can be converted to wavelengths within lambda . Associated wavelength converters, transmitters and receivers are also described. This approach applies not only to the use of EDFAs, but also to gain-flattening elements, dispersion-compensating fibers, variable attenuators, and any intermediate components having bandwidths smaller than the transmission fiber.

    8.
    发明专利
    未知

    公开(公告)号：DE69824493D1

    公开(公告)日：2004-07-22

    申请号：DE69824493

    申请日：1998-07-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： DIGIOVANNI DAVID JOHN ,  STENTZ ANDREW JOHN

    IPC: G02B6/04 ,  G02B6/28 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/094 ,  H01S3/0941 ,  G02B6/26

    Abstract: In accordance with the invention, light is coupled from a plurality of semiconductor emitters to a cladding-pumped fiber via tapered fiber bundles fusion spliced to the cladding-pumped fiber. Individual semiconductor broad stripe emitters can be coupled to individual multimode fibers. The individual fibers can be bundled together in a close-packed formation, heated to melting temperature, drawn into a taper and then fusion spliced to the cladding-pumped fiber. Advantageously, the taper is then overcoated with cladding material such as low index polymer. In addition, a fiber containing a single-mode core can be included in the fiber bundle. This single-mode core can be used to couple light into or out of the single-mode core of the cladding-pumped fiber.

Patent Agency Ranking