Accession Number : AD0918315

Title :   Laser Receiver II.

Descriptive Note : Final technical rept. 16 Oct 72-2 Apr 73,

Corporate Author : MCDONNELL DOUGLAS ASTRONAUTICS CO ST LOUIS MO

Personal Author(s) : Brand, J. P. ; Carson, L. M. ; Green, S. I.

Report Date : JUL 1973

Pagination or Media Count : 64

Abstract : The objective of this program was to design, fabricate, and deliver an optical receiver for use in the 1 Gbps PGBM brassboard laser communication system. The receiver was to operate with 1 Gbps mode-locked laser pulses at a wavelength of 0.53 micrometers and provide unattended operation in its system environment. The program included a design phase during which improvements in receiver automatic gain control were investigated. It also included the fabrication effort and both optical and electrical evaluation of receiver components. The design approach used a Dynamic Crossed Field Photomultiplier (DCFP) with a photocathode sensitive to 0.53 micrometer radiation. The DCFP is ideally suited for automatic gain control to allow 'hands off' operation. The DCFP is a gated photomultiplier with both its gain and gate timing coming from a 1 GHz RF electric field. The gate timing is synchronized to the optical input signal by a dithered gate phase-locked loop. The secondary multiplication gain is automatically controlled to provide a constant pulse amplitude at the DCFP output anode for a 10:1 input dynamic range. This AGC loop consists of a voltage controllable RF power source at 1 GHz, high gain voltage amplifiers and the DCFP whose gain is proportional to the magnitude of the RF field.

Descriptors :   *LASERS, *LASER COMMUNICATIONS, *PHOTOMULTIPLIER TUBES, RECEIVERS, LIGHT PULSES, CROSSED FIELD DEVICES, PULSE COMMUNICATIONS, LASER BEAMS, DIGITAL SYSTEMS, AUTOMATIC GAIN CONTROL, DYNAMIC RANGE, GATES(CIRCUITS), DYNODES, EFFICIENCY, QUANTUM EFFICIENCY, GAIN, NEODYMIUM LASERS, FREQUENCY MULTIPLIERS, HARMONIC GENERATORS, INFRARED PULSES.

Subject Categories : Electrical and Electronic Equipment
      Lasers and Masers
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE