中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

24 records (took 0.023 seconds)

    WIDE BAND LIGHT AMPLIFIER
    2.
    发明专利
    WIDE BAND LIGHT AMPLIFIER 失效

    公开(公告)号：JP2000124529A

    公开(公告)日：2000-04-28

    申请号：JP15108898

    申请日：1998-06-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SRIVASTAVA ATUL K ,  SULHOFF JAMES W ,  SUN YAN ,  ZYSKIND JOHN L

    IPC: H01S3/10 ,  H01S3/06 ,  H01S3/067

    Abstract: PROBLEM TO BE SOLVED: To realize a wide band light amplifier having uniform gain spectra. SOLUTION: A wise band amplifier 200 has at least two sections of a first (common) section 202 and a second (branch) section 204. After a light signal enters the common section 202, the light signal is branched into two (more than two) independent subbands. These independent subbands are respectively sent to the separate branches of the branch section 204 and after the subbands are amplified there, they are recombined to turn into an output signal. In concrete terms, the signal is branched into a short-wavelength (S) band, an intermediate-wavelength (M) band and a long-wavelength (L) band. These bands respectively correspond to each branch of the section 204. In am embodiment, the S band is in a range of 1510 to 1525 nm, the M band is in a range of 1525 to 1565 nm and the L band is in a range of 1565 to 1610 nm. It is also possible that one branch or a plurality of branches is or are further made to branch to realize a hybrid structure.

    OPTICAL COMMUNICATION SYSTEM AND ITS METHOD
    4.
    发明专利
    OPTICAL COMMUNICATION SYSTEM AND ITS METHOD 失效

    公开(公告)号：JP2000244399A

    公开(公告)日：2000-09-08

    申请号：JP2000037111

    申请日：2000-02-15

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHRAPLYVY ANDREW ROMAN ,  JOPSON ROBERT MEACHEM ,  SRIVASTAVA ATUL KUMAR ,  SULHOFF JAMES WILLIAM ,  SUN YAN

    IPC: H01S5/50 ,  H04B10/00 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02 ,  H04B10/16

    Abstract: PROBLEM TO BE SOLVED: To realize communication without substantially an error by detecting transmitted bits in an amplified optical signal according to detection thresholds derived as a function of the maximum power level corresponding to the first bit value and the minimum power level corresponding to the second bit value. SOLUTION: In a receiver opart 650, a band-pass filter 651 is used for selecting one channel at once for a proper measurement, for example, a BER or eye measurement. To put it concretely, bits in 12 channels using the optimal detection threshold level are detected by using a detector 652. The other components in the receiver part 650 are used for applying pre-amplification to an erbium-dopes fiber amplifier 660. A light attenuator 661 and an eye monitor 662 are used for simplifying the measurement of an input signal pattern. An attenuator 663 is used for simplifying the measurements of the power and bit error rate of a received signal.

    OPTICAL COMMUNICATION SYSTEM OPERATING METHOD AND OPTICAL COMMUNICATION SYSTEM
    6.
    发明专利
    OPTICAL COMMUNICATION SYSTEM OPERATING METHOD AND OPTICAL COMMUNICATION SYSTEM 失效

    公开(公告)号：JP2001069085A

    公开(公告)日：2001-03-16

    申请号：JP2000214301

    申请日：2000-07-14

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： BANERJEE SONALI ,  SRIVASTAVA ATUL KUMAR ,  SULHOFF JAMES WILLIAM ,  SUN YAN

    IPC: H01S5/50 ,  H04B10/2507 ,  H04B10/2543 ,  H04B10/293 ,  H04B10/294 ,  H04B10/564 ,  H04B10/572 ,  H04J14/00 ,  H04J14/02 ,  H04B10/14 ,  H04B10/02

    Abstract: PROBLEM TO BE SOLVED: To compensate the gain change of an optical amplifier, to reduce a distortion and a crosstalk in a saturation area and to improve transmission efficiency and quality by introducing a reservoir optical channel having a prescribed wavelength into a communication route. SOLUTION: In a wavelength division multiplex system 400, a laser beam source 410 and a 3 dB coupler 411 or the like are utilized and the channel is inputted before the first semiconductor optical amplifier 421 of a transmitting part 420. The reservoir channel is positioned in the signal band of the optical amplifier 421, positioned in the wavelength in a spectrum in the neighborhood of the max. point of the min. point of gain change and made to be higher than a traffic channel in an initial strength level. Then gain change is reduced and the strength is shared with another channel in accordance with the change of an input strength. Thus, the channel is functioned as a reception compensating mechanism so that gain change caused by a strength fluctuation in the input of the optical amplifier, for example, the addition or erasion of the traffic channel is suppressed.

    WAVELENGTH DIVISION MULTIPLE RING NETWORK AND STABILIZATION METHOD THEREFOR
    7.
    发明专利
    WAVELENGTH DIVISION MULTIPLE RING NETWORK AND STABILIZATION METHOD THEREFOR 失效

    公开(公告)号：JPH11145910A

    公开(公告)日：1999-05-28

    申请号：JP25865398

    申请日：1998-09-11

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SRIVASTAVA ATUL KUMAR ,  SULHOFF JAMES W ,  SUN YAN ,  ZYSKIND JOHN LEHRER

    IPC: H04B10/02 ,  H04B10/04 ,  H04B10/06 ,  H04B10/14 ,  H04B10/18 ,  H04B10/20 ,  H04J14/02

    Abstract: PROBLEM TO BE SOLVED: To prevent laser oscillation of a WDM ring network by providing a node link and a protective means in a network, providing an optical fiber part and an access node site in the node link and making the protective means change the optical transmission characteristics of the inactive part of the trans mission band of the network. SOLUTION: Optical amplifiers 111-113 are erbium dope fiber amplifiers EDFA and supply optical gain for compensating loss in the node link. Thus, for instance, the amplifier 111 is arranged so as to compensate the loss in grating, a coupler and a fiber connector of an optical fiber span 104 and a WAD element 107. In normal installation, the node links, that are the respective ones of 101/104-103/106, are provided with the amplifier gain for canceling the loss by the fiber and WAD in the links.

    8.
    发明专利
    未知

    公开(公告)号：DE60036891D1

    公开(公告)日：2007-12-13

    申请号：DE60036891

    申请日：2000-02-09

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHRAPLYVY ANDREW ROMAN ,  JOPSON ROBERT MEACHEM ,  SRIVASTAVA ATUL KUMAR ,  SULHOFF JAMES WILLIAM ,  SUN YAN

    IPC: H01S5/50 ,  H04B10/17 ,  H04B10/00 ,  H04B10/02 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.

    Lightwave communications systems using semiconductor optical amplifiers
    9.
    发明专利
    Lightwave communications systems using semiconductor optical amplifiers 未知

    公开(公告)号：AU1643000A

    公开(公告)日：2000-08-24

    申请号：AU1643000

    申请日：2000-02-15

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHRAPLYVY ANDREW ROMAN ,  SUN YAN ,  SULHOFF JAMES WILLIAM ,  SRIVASTAVA ATUL KUMAR ,  JOPSON ROBERT MEACHEM

    IPC: H01S5/50 ,  H04B10/00 ,  H04B10/02 ,  H04B10/17 ,  H04B10/18 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

    Abstract: Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit "0", and a minimum power level associated with a second bit value, e.g., bit "1". Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.

Patent Agency Ranking