Title :
Fiber Optic Digital Telemetry for Deep Sea Submersibles
Author :
Tanaka, Grant A. ; Nakagawa, Arthur T.
Author_Institution :
Hawaii Lab., Environ. Sci. Dept., Naval Ocean Syst. Center, Kailua, HI, USA
Abstract :
The telemetry electronics for an optical fiber data link in a small unmanned underwater vehicle are reported. The Miniature Optical Stereo Evaluation System (MOSES) vehicle transmits two monochrome television channels to the surface for use in a stereo display. Each video channel is digitally encoded into four bits using Multi-Level Delta Modulator (MLDM) encoders. The resultant data rate is 120 Mb/s NRZ, and is transmitted over the optical fiber at a wavelength of 1.25 μm. Command and control are transmitted to the vehicle at 2.0 Kb/s and at a wavelength of 0.83 μm. Optical duplexers permit simultaneous two-way transmission of data over a single optical fiber. Transmission distances of 8.2 kilometers have been demonstrated using graded index, multi-mode fibers.
Keywords :
channel coding; delta modulation; mobile robots; oceanographic techniques; optical fibre telemetry; optical links; remotely operated vehicles; underwater acoustic telemetry; underwater vehicles; video coding; MLDM encoders; MOSES vehicle; NRZ; bit rate 120 Mbit/s; bit rate 2.0 kbit/s; command and control; deep sea submersibles; distance 8.2 km; fiber optic digital telemetry; miniature optical stereo evaluation system vehicle; monochrome television channels; multilevel delta modulator encoders; multimode fibers; optical duplexers; optical fiber data link; small unmanned underwater vehicle; stereo display; telemetry electronics; two-way transmission; video channel; wavelength 0.83 mum; wavelength 1.25 mum; Cable TV; Cable shielding; Communication cables; Instruments; Monitoring; Optical fiber cables; Optical fibers; Sonar measurements; Telemetry; Vehicles;
Conference_Titel :
OCEANS '80
Conference_Location :
Seattle, WA
DOI :
10.1109/OCEANS.1980.1151360
