Performance of Optical Receivers in Detection of Variable Duty Cycle Manchester Coded Data.
Abstract
The goal of this paper is to determine whether the probability of error in bit detection by optical receivers can be improved through the use of a variable duty cycle Manchester modulation format and proper receiver design. It has been speculated that a short source duty cycle would improve receiver performance, particularly when the source average power is constant. The parameters assumed to affect the probability of error include optical power, temperature, pulse width, amplifier gain, signal shot noise, thermal noise, and the circuit parameters of resistance and capacitance. Performance predictions are made for the optimum receiver of signals in additive white noise, the matched-filter receiver, and two suboptimum receivers. The first suboptimum receiver is nothing more than a detector and an FET amplifier. The second consists of the same components with an equalizing filter added. Graphical data showing performance under extreme variations of the parameters listed above indicate that the matched-filter receiver is far superior to the suboptimum receivers. The equalized receiver performs better than the basic detector/amplifier receiver only under the most favorable operating conditions. The performance variation with source duty cycle varies with operating conditions. Under worst conditions the maximum duty cycle is recommended. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1979
- Accession Number
- ADA080422
Entities
People
- Robert Andrew Cilley
Organizations
- Air Force Institute of Technology