Electrical Engineering and Computer Science Scholarly Works: Recent submissions

Now showing items 281-300 of 309

    • Cross-phase modulation in multispan WDM optical fiber systems 

      Hui, Rongqing; Demarest, Kenneth R.; Allen, Christopher Thomas (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-06)
      The spectral characteristics of cross-phase modulation (XPM) in multispan intensity-modulation direct-detection (IM-DD) optical systems are investigated, both experimentally and theoretically. XPM crosstalk levels and its ...

    • Analyzing lead information from SAR images 

      Van Dyne, Michele M.; Tsatsoulis, Costas; Fetterer, Florence (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-03)
      Leads are relatively linear features in the sea ice cover, which are composed of open water or new, thin ice, Because of their composition, leads impact the ocean/air heat exchange, Automated analysis of leads from sea ice ...

    • Subcarrier multiplexing for high-speed optical transmission 

      Hui, Rongqing; Zhu, Benyuan; Huang, Renxiang; Allen, Christopher Thomas; Demarest, Kenneth R.; Richards, Douglas L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-03)
      The performance of high-speed digital fiber-optic transmission using subcarrier multiplexing (SCM) is investigated both analytically and numerically. In order to reduce the impact of fiber chromatic dispersion and increase ...

    • An adaptive first-order polarization-mode dispersion compensation system aided by polarization scrambling: Theory and demonstration 

      Pua, Hok Yong; Peddanarappagari, Kumar V.; Zhu, Benyuan; Allen, Christopher Thomas; Demarest, Kenneth R.; Hui, Rongqing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-06)
      An adaptive polarization-mode dispersion (PMD) compensation system has been developed to cancel the effects of first-order PMD by producing a complementary PMD vector in the receiver. Control parameters for the PMD ...

    • Generation of ultrahigh-speed tunable-rate optical pulses using strongly gain-coupled dual-wavelength DFB laser diodes 

      Hui, Rongqing; Zhu, Benyuan; Demarest, Kenneth R.; Allen, Christopher Thomas; Hong, Jin (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-05)
      A novel and simple method to generate a variable-rate, ultrahigh-speed optical pulse train is demonstrated using a dual-wavelength, strongly gain-coupled distributed-feedback laser diode, The repetition rate of the optical ...

    • ARKTOS: An intelligent system for SAR sea ice image classification 

      Soh, Leen-Kiat; Tsatsoulis, Costas; Gineris, Denise; Bertoia, Cheryl (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-01)
      We present an intelligent system for satellite sea ice image analysis named Advanced Reasoning using Knowledge for T ping Of Sea ice (ARKTOS). ARKTOS performs fully automated analysis of synthetic aperture radar (SAR) sea ...

    • Focused synthetic aperture radar processing of ice-sounder data collected over the Greenland ice sheet 

      Legarsky, Justin; Gogineni, Sivaprasad; Akins, Torry L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-10)
      We developed a synthetic aperture radar (SAR) processing algorithm for airborne/spaceborne ice-sounding radar systems and applied it to data collected in Greenland. By using focused SAR (phase-corrected coherent averaging), ...

    • On reconciling ground-based with spaceborne normalized radar cross section measurements 

      Baumgartner, François; Munk, Jens; Jezek, Kenneth C.; Gogineni, Sivaprasad (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-02)
      This study examines differences in the normalized radar cross section, derived from ground-based versus spaceborne radar data. A simple homogeneous half-space model, indicates that agreement between the two improves as 1) ...

    • Intensity-dependent phase-matching effects on four-wave mixing in optical fibers 

      Song, Shuxian; Allen, Christopher Thomas; Demarest, Kenneth R.; Hui, Rongqing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-11)
      A new phase-matching factor is derived for four-wave mixing (FWM) that includes the effects of self-phase and cross-phase modulation in optical fibers. Theoretical results predict that the wavelength of peak FWM efficiency ...

    • A novel method for measuring polarization-mode dispersion using four-wave mixing 

      Song, Shuxian; Allen, Christopher Thomas; Demarest, Kenneth R.; Hui, Rongqing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-12)
      A method for measuring polarization-mode dispersion (PMD) on fiber links using Four-wave mixing (FWM) generation is presented. This method uses a probe signal to analyze the signal polarization state via PWM generation, ...

    • Multiwavelength all-optical clock recovery 

      Johnson, C.; Demarest, Kenneth R.; Allen, Christopher Thomas; Hui, Rongqing; Peddanarappagari, Kumar V.; Zhu, Benyuan (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-07)
      Multiwavelength clock recovery is especially desirable in systems that use wavelength-division-multipleged technology. A multiwavelength clock-recovery device can greatly simplify costs by eliminating the need to have a ...

    • PMD-insensitive SCM optical receiver using polarization diversity 

      Hui, Rongqing; Allen, Christopher Thomas; Demarest, Kenneth R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-11)
      Subcarrier multiplexing (SCM) optical systems with high subcarrier frequencies are susceptible to power fading caused by fiber polarization-mode dispersion (PMD). In this letter, an SCM optical receiver free of carrier ...

    • Tunable millimeter-wave generation with subharmonic injection locking in two-section strongly gain-coupled DFB lasers 

      Hong, Jin; Hui, Rongqing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-05)
      Using two-section dual-mode strongly gain-coupled (SGC) distributed feedback (DFB) lasers, tunable millimeter-wave (mm-wave) generation from 18 to 40 GHz can be achieved under CW bias conditions, Due to its high speed and ...

    • Wideband measurements of ice sheet attenuation and basal scattering 

      Allen, Christopher Thomas; Gogineni, Sivaprasad; Paden, John D.; Jezek, Kenneth C.; Dahl-Jensen, Dorthe; Larsen, Lars B. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-04)
      We are developing a multifirequency multistatic synthetic aperture radar (SAR) for determining polar ice sheet basal conditions. To obtain data for designing and optimizing radar performance, we performed field measurements ...

    • III-nitride-based planar lightwave circuits for long wavelength optical communications 

      Hui, Rongqing; Wan, Yueting; Li, Jing; Jin, Sixuan; Lin, Jingyu; Jiang, Hongxing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-01)
      Planar lightwave circuits based on III-nitride wide-bandgap semiconductors are proposed and the feasibility of developing III-nitride-based novel photonic integrated circuits for applications in fiber-optical communications ...

    • Fiber chromatic dispersion and polarization-mode dispersion monitoring using coherent detection 

      Fu, Biao; Hui, Rongqing (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-07)
      We propose and experimentally demonstrate a nondestructive method to monitor chromatic dispersion (CD) and polarization-mode dispersion (PMD) in traffic-carrying wavelength-division-multiplexing optical systems. Coherent ...

    • 10-Gb/s SCM fiber system using optical SSB modulation 

      Hui, Rongqing; Zhu, Benyuan; Huang, Renxiang; Allen, Christopher Thomas; Demarest, Kenneth R.; Richards, Douglas L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-08)
      A 10-Gb/s subcarrier multiplexing long-haul optical system is reported. 4 x 2.5 Gb/s data streams are combined into one wavelength, which occupies a 20-GHz optical bandwidth, Optical single sideband is used to increase ...

    • Raman crosstalk in fiber-optic hybrid CATV systems with wide channel separations 

      Tian, Feng; Hui, Rongqing; Colella, Barry; Bowler, David (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-01)
      The transfer function of nonlinear Raman crosstalk in fiber-optic systems is investigated both experimentally and analytically. When the channel separation is wide enough, the frequency response of the Raman crosstalk can ...

    • Degree-of-polarization and eye-closure penalty associated with optical signals with orthogonal polarizations 

      Shieh, W.; Hui, Rongqing; Yi, X. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-05)
      We perform a systematic measurement of the degree-of-polarization (DOP) and eye-closure penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations ...

    • Suppressing coherent noise in radar applications with long dwell times 

      Allen, Christopher Thomas; Mozaffar, Shadab N.; Akins, Torry L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-07)
      A method to for suppressing internally produced coherent noise in radar applications is presented and experimentally demonstrated. The technique enhances conventional coherent averaging and involves interpulse phase ...