Linearity and reproducibility of undersea electronics play key roles in determining the achievable performance of an undersea cable system. This paper describes the characteristics of undersea electronics and the measures taken in design and manufacture to achieve the desired performance and reliability, giving special emphasis to new features and applications. It describes in detail the performance achieved in the recently completed sg system linking the U.S. and France.
A b s r r d -S L undersea fiber-optic cable allows for the installation of multiple pairs of fibers in the same cable. Using the same high-pressure repeater housing as used in previous undersea systems (and thereby accruing the benefits of no tooling costs and proven handling methods), we are able to mount six optical regenerators. This group of regenerators will dissipate approximately 30 W in service. Previous undersea repeaters dissipated approximately 8 W and achieved a maximum internal temperature of 5 C above the repeater ambient. That might imply a temperature of 20 O C above ambient for the SL repeater, which would be intolerably high for reliable undersea performance and longevity. The main thrust of the SL design was to lower this temperature rise. We have achieved a design which is capable of dissipating 30 W with only 4OC temperature rise.This paper describes the design steps necessary to achieve this result and examines the overall repeater structure showing its special design features for accommodating fiber sealing and jointing.
A magnetometer array has been installed aboard the SCARAB submersible to enable it to detect and track buried undersea telephone cable. Four three‐axis magnetometers sense the magnetic field of a 25‐Hz current applied to the cable. The magnetometer signals are filtered, amplified, digitized, and multiplexed onto SCARAB's umbilical cable for transmission to the control ship. A shipborne minicomputer processes these signals in real time to determine the cable location, which is continuously displayed to SCARAB's operator on a graphics terminal. This paper describes the development and capabilities of the system. Among the topics discussed are a history of the cable‐locating problem, an analysis of the factors governing the achievable 25‐Hz signal level, a description of the magnetic noise spectrum and its sources, and a discussion of the signal‐processing techniques. We also examine the dependence of system performance on signal and noise levels.
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