Subsea cables with submersible fiber optic ducts
A technology for submarine cables and optical fibers, applied in the field of submarine cables with submersible optical fiber pipelines, can solve the problems of zero-stress aging, stress corrosion, reducing optical fiber strength and transparency, etc.
Active Publication Date: 2020-06-16
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- Application Information
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Problems solved by technology
Two other degradation mechanisms associated with water are stress corrosion and zero stress aging, both of which reduce the strength and clarity of unprotected optical fiber over time
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[0019] Fiber optic cables may be deployed in a variety of underwater environments, including subsea applications, such as permanent reservoir monitoring (PRM), where exposure to water is for relatively long periods of time (eg, months or years). In particular, PRM systems can be designed for decades of ultra-deep water operation (eg, greater than 1500 m), while still being suitable for use at shallower depths. Conventional knowledge for such applications dictates the use of gel-filled stainless steel tubing for the fiber optics, with tight seals at each of the connection and sensor splices (of which there are typically hundreds, and possibly thousands) seals. Each seal represents a cost, time investment and potential point of failure to the system. Where the need for such seals (and associated cost and risk) can be eliminated, manufacturing lead times can be reduced and manufacturing efficiency increased.
[0020] In this regard, noting short fibers (eg, on the scale of mete...
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Abstract
In at least some embodiments, the disclosed submarine cable includes one or more submersible fiber optic ducts each having at least one tightly buffered optical fiber for transmitting optical signals. Each tightly buffered optical fiber may have a relatively finite length. The submarine cable may further comprise a plurality of strength members wound anti-helically around or with one or more submersible fiber optic ducts. It may also or alternatively include at least one hermetically sealed fiber optic duct having at least one protected optical fiber spliced to one of the tightly buffered optical fibers. At least some implementations splice each of the tightly buffered fibers to a corresponding protected fiber for long-distance communications. Submersion of the submersible pipeline may be provided via a connector at the end of the submarine cable, via an interruption where the sensor is attached, and / or via a discharge opening in the pipeline wall.
Description
[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application Serial No. 61 / 941,389, entitled "Pressure-Balanced Subsea Optical Cable," and filed February 18, 2014 by Jeremy Crane Smith and Robert Alexis Peregrin Fernighough, which application is incorporated herein by reference. Background technique [0003] Fiber optics are commonly used to transmit data at high bandwidths. They have been seen by the telecommunications industry as a key factor in the evolution of communications architectures to their current state, and for this reason, investments to develop fiber optic communications technologies have focused on making such bandwidths available over long distances. The long distances further necessitate the production of cables that are both affordable and robust. Telecommunication cables typically must resist not only the minor damage associated with transmission and installation, but also the hazards of aging a...
Claims
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IPC IPC(8): G02B6/44
CPCG02B6/4427G02B6/443G02B6/44384G01V1/226G01V1/28G01V3/083G01V2003/086G02B6/255G02B6/4434G02B6/506
Inventor J.C.史密斯R.费尼霍夫
Owner PGS