Teletype Communications at Optical Frequencies for the ALOHA System.

Abstract

The paper describes a teletype to teletype incoherent optical communications link presently operating on the campus of the University of Hawaii. A carrier 'on-off', direct detection communication scheme is used to transfer the binary information between teletypes. The transmission medium is the turbulent atmosphere, with emphasis on beam steering and beam spreading effects. Other types of effects, such as coherence degradation, polarization fluctuations, and beam scintillation are of no real consequence in this type of incoherent, unpolarized system. Atmospheric scattering is neglected. Receiver signal-to-noise ratio, effects of rain, and beam diameters in the transmitting and receiving planes are some of the system parameters measured and discussed. The actual light source and detector used are also discussed in some detail. The link covers about 160 yards. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1971
Accession Number
AD0723332

Entities

People

  • Earl Kanehira

Organizations

  • University of HawaiĘ»i System

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Atmospheres
  • Atmospheric Scattering
  • Beam Steering
  • Degradation
  • Detection
  • Detectors
  • Diameters
  • Frequency
  • Lepidoptera
  • Light Sources
  • Optical Communications
  • Polarization
  • Scattering
  • Scintillation
  • Steering

Fields of Study

  • Physics

Readers

  • Atmospheric Remote Sensing.
  • Optical Physics and Photonics.
  • Radio communications and signal processing.