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.
Long‐distance submarine cable transmission systems require precise, highly reliable repeaters for amplification, and adjustable equalizers for reducing accumulated transmission deviations. This article describes the problems and solutions in designing suitable repeaters and equalizers for the high capacity SF System. This system uses a repeater with transistors to provide a capacity of 800‐message circuits.
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