Citation
Abstract
A previous article [1] defined fundamental parameters that determine the capacity of pulse-position modulation (PPM) on a soft-decision optical channel under various statistical models. This article describes the relationship between the four fundamental parameters and a multitude of physical parameters that describe the laser, channel, and detector. Using this relationship and the gradient of capacity, the sensitivity of capacity with respect to each fundamental and physical parameter is derived. Numerical results indicate that, over a wide range of operating points, a single fundamental parameter dominates the capacity calculation. Capacity was found to be more sensitive to the signal intensity than to the background intensity| typically by a factor of approximately two|and the quantum e–ciency of a detector was found to be the single most important detector parameter. Leakage currents have virtually no impact on the capacity.
Keywords
Details
- Volume
- 42-143
- Published
- November 15, 2000
- Pages
- 1–16
- File Size
- 425.2 KB