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Phase-Modulated Optical Communication Systems
Digital Modulation of Optical Carrier.- Coherent Optical Receivers and Ideal Performance.- Impairment to Optical Signal.- Nonlinear Phase Noise.- Compensation of Nonlinear Phase Noise.- IntrachannelExpand
Equalization-enhanced phase noise for coherent-detection systems using electronic digital signal processing.
  • W. Shieh, K. Ho
  • Computer Science, Medicine
  • Optics express
  • 29 September 2008
Equalization-enhanced phase noise (EEPN) imposes a tighter constraint on the receive laser phase noise for transmission systems with high symbol rate and large electronically-compensated chromatic dispersion. Expand
Mode-dependent loss and gain: statistics and effect on mode-division multiplexing.
Information-theoretic channel capacities of mode-division-multiplexed systems in the presence of MDL are studied, including average and outage capacities, with and without channel state information. Expand
Error probability of DPSK signals with cross-phase modulation induced nonlinear phase noise
The error probability is derived analytically for differential phase-shift keying (DPSK) signals contaminated by both self- and cross-phase modulation (SPM and XPM)-induced nonlinear phase noise.Expand
Asymptotic probability density of nonlinear phase noise.
  • K. Ho
  • Mathematics, Medicine
  • Optics letters
  • 28 January 2003
The asymptotic probability density of nonlinear phase noise, often called the Gordon-Mollenauer effect, is derived analytically when the number of fiber spans is large. Nonlinear phase noise is theExpand
Mode Coupling and its Impact on Spatially Multiplexed Systems
Mode coupling is a key to overcoming challenges in mode-division-multiplexed transmission systems in multimode fiber. This chapter provides an in-depth description of mode coupling, including itsExpand
Linear Propagation Effects in Mode-Division Multiplexing Systems
  • K. Ho, J. Kahn
  • Mathematics
  • Journal of Lightwave Technology
  • 15 February 2014
In this paper, we review linear propagation effects in a multimode fiber (MMF) and their impact on performance and complexity in long-haul mode-division multiplexing (MDM) systems. We highlight theExpand
Analysis of homodyne crosstalk in optical networks using Gram-Charlier series
  • K. Ho
  • Mathematics
  • 1 February 1999
Homodyne crosstalk with the same wavelength as the signal causes severe system performance degradation in optical networks by beating with the desired signal. Gaussian approximation is found toExpand
Probability density of nonlinear phase noise
  • K. Ho
  • Physics
  • 1 September 2003
The probability density of nonlinear phase noise, often called the Gordon–Mollenauer effect, is derived analytically. The nonlinear phase noise can be accurately modeled as the summation of aExpand
Optimal soft decoding for combined trellis-coded quantization/modulation
The maximum a posteriori (MAP) algorithm is used as a minimum mean-squared-error decoder for combined trellis-coded quantization and modulation and significant performance improvement is achieved for both memoryless Gaussian and uniform source. Expand