Accession Number : ADP007015

Title :   A Comparison of Direct and Coherent Detection Systems with Optical Amplifiers,

Corporate Author : AT AND T BELL LABS BREININGSVILLE PA SOLID STATE TECHNOLOGY CENTER

Personal Author(s) : Granlund, S. W. ; Park, Y. K.

Report Date : 22 MAY 1992

Pagination or Media Count : 5

Abstract : The use of fiber amplifiers in future lightwave systems now appears certain. Many experiments have been published demonstrating both the long-distance and multi-channel capability of fiber amplifier-based systems. Most experiments have used conventional on direct detection systems but some experiments, including a record transmission distance experiment, have used coherent detection systems and models of both systems have been developed. This paper will compare the two systems under the same conditions using both experiments and models. We will emphasize a practical comparison by using a direct detection regenerator from AT and T's commercial, 1.7 Gb/s system and a shelf-mounted, coherent detection regenerator from a recent AT and T field trial. We will also emphasize a direct comparison by using transmitters of the same wavelength and identical optical paths including erbium-doped fiber amplifiers.

Descriptors :   *AMPLIFIERS, *OPTICAL EQUIPMENT, CHANNELS, COMPARISON, DETECTION, ERBIUM, FIBERS, PATHS, TRANSMITTERS, DIODES.

Subject Categories : Electrical and Electronic Equipment
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE