Design and test results of an optical fiber feedthrough for an optical submarine repeater

Recent advances in submarine optical fiber cable transmission systems in Japan

“…In the former sealing method [47], optical loss changes from 0 to 800 atm water pressure and from 5 to 25°C temperature differences are less than 0.03 dB and 0.01 dB, respectively.…”

“…10. Schematic diagram of a feed through [45], [47] doped A1 and Au/Pt/Ti with TIN diffusion barriers as shown in Fig. 9 is employed [44].…”

“…Repeater Housing [45], [46]: The pressure housing for a submarine optical repeater is almost the same as that has been used for submarine coaxial cable systems. However, it requires several new features specific to submarine optical fiber cable systems as follows.…”

“…Optical fiber feed through [45], [47]: The feed through is a section through which the optical fibers and a power feeding line pass to regenerators in the repeater pressure housing (Fig. 10).…”

“…In these methods, the surface of each polyimid-coated-optical fiber is coated with a thin metal layer by vapor deposition technique, and the group of these optical fibers is placed into a protective copper pipe. The gap between them is sealed by soldering [47] or a combination of epoxy resin and soldering [45].…”