中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

24 records (took 0.023 seconds)

    LIGHTWAVE COMMUNICATION SYSTEMS USING SEMICONDUCTOR OPTICAL AMPLIFIERS
    11.
    发明专利
    LIGHTWAVE COMMUNICATION SYSTEMS USING SEMICONDUCTOR OPTICAL AMPLIFIERS 未知

    公开(公告)号：CA2298272C

    公开(公告)日：2003-10-28

    申请号：CA2298272

    申请日：2000-02-08

    Applicant: LUCENT TECHNOLOGIES INC

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

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

    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 gai n 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 P TOTAL/2N, where P TOTAL 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 tot al 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.

    14.
    发明专利
    未知

    公开(公告)号：DE69827550T2

    公开(公告)日：2005-11-24

    申请号：DE69827550

    申请日：1998-06-02

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: H01S3/067 ,  H01S3/23 ,  H04B10/17 ,  H01S3/06

    Abstract: A wide band optical amplifier employing a split-band architecture in which an optical signal is split into several independent sub-bands which then pass in parallel through separate branches of the optical amplifier. Each branch may be optimized for the sub-band that traverses it. The independent sub-bands are combined before output, resulting in a broad band, high efficiency amplifier. Alternative, hybrid split-band amplifiers are described. As a result of their desirable characteristics, these wide band optical amplifiers may be used in dense WDM communications systems.

    16.
    发明专利
    未知

    公开(公告)号：DE60036891T2

    公开(公告)日：2008-08-07

    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.

    DISTORTION COMPENSATION IN OPTICALLY AMPLIFIED LIGHTWAVE COMMUNICATION SYSTEMS
    17.
    发明专利
    DISTORTION COMPENSATION IN OPTICALLY AMPLIFIED LIGHTWAVE COMMUNICATION SYSTEMS 未知

    公开(公告)号：CA2310305C

    公开(公告)日：2004-04-06

    申请号：CA2310305

    申请日：2000-05-30

    Applicant: LUCENT TECHNOLOGIES INC

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

    IPC: H04B10/17

    Abstract: Distortion and crosstalk that occurs when operating optical amplifiers in saturation is substantially reduced by passively compensating for gain variations caused b y changes in input power to the optical amplifiers. More specifically, in an optical communication system having one or more optical amplifiers, a "reservoir" optical channel is supplied in addition to the other traffic-carrying optical channels. The wavelength of the reservoir channel i s selected such that the power level of the reservoir channel varies in response to changes in power levels of the traffic-carrying channels. Because gain variations are typically highest around the gain peak region in an optical amplifier's gain bandwidth, the reservoir channel in one exemplary embodimen t is assigned a wavelength around the gain peak region. As such, the reservoir channel can absorb or otherwise receive most of the distortion and crosstalk while the traffic-carrying channels located away from the gain peak region will experience less distortion and crosstalk. Importantly, this passive compensation scheme can be used in an amplified system which is operating in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk.

Patent Agency Ranking