Optical TDR2022-08-12T09:11:56+00:00

C-Kore Subsea OTDR

C-Kore Subsea Optical TDR

The C-Kore Subsea OTDR (optical time domain reflectometer) is a compact automated tool for testing subsea fibre optic cables. It can be configured in advance by C-Kore System Ltd or easily set up in the field by the end-user. It is simple to use, automating the previously complex work of operating an OTDR, and thus does not require any specialist personnel offshore. The unique design allows up to 12 fibre inputs to be tested from the same configuration.

The tool allows measurement to be made directly subsea, eliminating the problems of deck-based downline testing, including attenuation, offset errors, faulty downlines and human error. The C-Kore Subsea OTDR is entirely self-contained and does not require any ROV integration.

When fault-finding the OTDR is used to precisely identify where in the cable the fault resides. This knowledge can be used to inform repair versus replacement strategies. It can also be used to evaluate spare fibre optic channels to enable successful field reconfiguration to mitigate faults, without expensive cable repairs or replacement.

For new asset installation the OTDR is used to characterise cables for future reference and find discontinuities that have not yet affected signal transmission integrity. As this testing is automated, vessel time and personnel requirements are reduced to achieve cost savings. The unit can be deployed subsea to take optical TDR readings directly once installation is complete and prove fibre health before hook-up.

The unit is powered by a high-capacity rechargeable battery for stand-alone operation. Simple user configuration is possible with a plug-and-play USB connection to choose what the unit will test and when. Every result is data-logged and the unit has built-in software for result analysis.

Main Benefits

  • Precisely locate faults and discontinuities within fibre optic cables
  • Save vessel and personnel costs with fast automated testing
  • Measure directly subsea for repeatable, reliable test results
  • Stand alone, self-contained unit with no ROV integration required



C-Kore units are available with a wide-range of connector and body styles to suit any application. We hold a stock of housings to allow a rapid response to urgent enquiries. Please get in touch to discuss your optical connector requirements and the solutions we can offer.

  • Siemens (Tronic) DigiTRONf

  • Teledyne ODI Rolling Seal

  • Seacon Hydralight Wet-Mate

  • Official parts from original connector manufacturers

  • Other connector types are available on request

The C-Kore Rental Service


A copy of the C-Kore Config App is saved on the internal storage of every C-Kore unit. When the C-Kore system is connected to a PC using the supplied USB cable a removable drive will appear in Windows. Just start the program to edit configuration settings and download results using a simple interface.

The configuration application works on PCs running Microsoft Windows. The software runs directly and does not require any special installation steps.


The C-Kore OTDR units are compact and self-contained, allowing for simple handling on the deck and subsea. To save time they can be deployed in the ROV tooling tray, diver cage or basket.

The exact unit specification varies with the measurement connector type, details for a typical unit are given below:

  • Dimensions: 290 x 600 x 125 mm

  • Weight (in air): 15-20kg

  • Depth Rating: 3000 msw

  • Operating Temperature: -10°C to +50°C

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