Offshore/subsea systems

Study Explores Integration of Subsea Optical Distribution Systems

The authors of this paper describe systems that combine fiber-optic communications for subsea control systems and downhole fiber-optic sensing systems into the same subsea optical distribution system.

Subsea control system
Fig. 1—Subsea control systems require redundant, bidirectional communications between the topsides and subsea control modules. Subsea optical distribution complexity and costs are minimized when sensing and communications can rely on the same optical distribution systems.
OTC 32645.

Subsea control systems use electric or optical communication channels within subsea optical distribution systems for redundant, duplex telemetry between topside facilities and subsea control systems. Downhole fiber-optic sensing (DFOS) systems use the same subsea optical distribution systems for establishing transmission paths between the same topside facilities and downhole sensing fibers. At the time of writing, subsea fiber-optic control and sensing systems have been operated on independent subsea optical distribution systems. This redundancy introduces complexity and cost into the overall subsea optical distribution system required for subsea developments.

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