Accession Number : AD0902097

Title :   Wideband Electronics for High Speed Digital Laser Communications.

Descriptive Note : Final rept. 1 Mar 71-1 Apr 72,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : Johnson, T. J. ; Asato, R. ; Earhart, R. ; Aucoin, G. ; Huang, J.

Report Date : MAY 1972

Pagination or Media Count : 100

Abstract : This report describes the design and development of the high speed data handling electronics for a mode locked laser communications system. The electronics consist of a transmitter electronics and a receiver electronics package. The transmitter electronics accepts up to four channels of video, analog multiplexes the video onto a single line, interfaces with a 6-bit 50 Ms/s A/D converter, adds digital sync information, multiplexes the digital data into a serial stream, and interfaces the data to a mode locked laser modulator at 200 or 300 Mb/s. The receiver electronics accepts the detected 1 mV, 0.5 nsec triangular pulse output of the laser receiver, performs bit synchronization, digital demultiplexing, automatic sync acquisition, and D/A conversion, thereby reproducing the four video streams. A bit error checker and counter are incorporated into the receiver electronics to allow bit error rate tests to be run on the link. Tests were run on a simulated laser link. A reliability study was performed to assess the potential reliability of this type of equipment when designed for space or controlled environment ground use. (Author)

Descriptors :   (*OPTICAL COMMUNICATIONS, DIGITAL SYSTEMS), (*DATA TRANSMISSION SYSTEMS, LASERS), BROADBAND, MULTIPLEXING, VIDEO AMPLIFIERS, SYNCHRONIZATION(ELECTRONICS), RELIABILITY(ELECTRONICS), INTERFACES, DIGITAL TO ANALOG CONVERTERS, ERRORS, TIMING CIRCUITS, PULSE CODE MODULATION, MATHEMATICAL MODELS, TRANSISTORS.

Subject Categories : Lasers and Masers
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE