Tests on fiber optic cables • OTDR • Power Meter • ORL • PMD • CD •

Engineering Office

tel         +49 (0)5101/58 45 01
mobile +49 (0)171 528 54 60





The Engineering Office Koren, Telecommunications, was founded in 1995 and deals exclusively with tests on cables.

Our services include:

  • All kind of acceptance tests
  • OTDR-tests on single-mode fibers (fiber optic cables) at 1310, 1550 and 1625nm
  • Evaluating of OTDR-traces with FiberDoc
  • Power meter tests (ILM) insertion loss measurement at 1310, 1550 and 1625nm, bidirectional
  • Optical return loss test (ORL) with a Power meter, bidirectional
  • Chromatic Dispersion test (CD-test) in the C- and L-band
  • Polarization Mode Dispersion test (PMD-test)
  • Test of Dark Fiber across Europe (e.g. London-Paris-Marseille-Zurich- Amsterdam)
  • In case of cables switching over night we can offer immediate analyze of splice values
  • OTDR-tests on cable drums just before installing
  • Training in the use of the software: “FiberDoc”
  • Perform standard tests on copper cables (telecommunication), insulation, loop resistance, difference in resistance
  • Fault finding on copper cables with a bridge (KMK VI) and TDR (Time Domain Reflectometry)
All instruments that we use in our measurements have valid calibration certificates.

Our languages include German, English, Croatian, Polish, some Russian, and some Spanish.
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