DIN EN 61746:2005-10

1 General
  1.1 Scope
  1.2 Normative references
2 Definitions
3 Calibration test requirements
  3.1 Preparation
  3.2 Test conditions
  3.3 Traceability
4 Distance calibration - General
  4.1 Location error model
  4.2 Using the calibration results
  4.3 Measuring fibre length
5 Distance calibration methods
  5.1 External source method
      5.1.1 Short description and advantage
      5.1.2 Equipment
      5.1.3 Measurement procedure
      5.1.4 Calculations and results
      5.1.5 Uncertainties
  5.2 Concatenated fibre method
      5.2.1 Short description and advantages
      5.2.2 Equipment
      5.2.3 Measurement procedures
      5.2.4 Calculations and results
      5.2.5 Uncertainties
  5.3 Recirculating delay line method
      5.3.1 Short description and advantage
      5.3.2 Equipment
      5.3.3 Measurement procedures
      5.3.4 Calculations and results
      5.3.5 Uncertainties
6 Loss calibration - General
  6.1 Determination of the displayed power level F
  6.2 Selection of an appropriate reference loss A[ref]
  6.3 Development of a test plan
  6.4 Polarization dependence
  6.5 Calculation of the calibration results
  6.6 Using the calibration results
7 Loss calibration methods
  7.1 Loss calibration with fibre standard
      7.1.1 Short description and advantage
      7.1.2 Equipment
      7.1.3 Measurement procedure
      7.1.4 Calculations and results
      7.1.5 Uncertainties
  7.2 External source method
      7.2.1 Short description and advantage
      7.2.2 Equipment
      7.2.3 Measurement procedure
      7.2.4 Calculations and results
      7.2.5 Uncertainties
  7.3 Splice simulator method
      7.3.1 Short description and advantage
      7.3.2 Equipment
      7.3.3 Procedure
      7.3.4 Calculations and results
      7.3.5 Uncertainties
  7.4 Power reduction method
      7.4.1 Short description and advantage
      7.4.2 Equipment
      7.4.3 Measurement procedure
      7.4.4 Calculations and results
      7.4.5 Uncertainties
8 Reflectance calibration
9 Documentation
  9.1 Measurement data and uncertainties
  9.2 Test conditions
Annex A (normative) Recirculating delay line for distance
                    calibration
                    A.1 Construction
                    A.2 Calibration
                    A.3 Uncertainties
                    A.4 Documentation
Annex B (normative) Optical fibre standard for loss
                    calibration
                    B.1 Fibre requirements
                    B.2 Suitability check of the fibre
                    B.3 Preparation and calibration of the
                        fibre standard
                    B.4 Recalibration of the optical fibre
                        standard
                    B.5 Uncertainty of the fibre standard
                    B.6 Documentation
Annex C (normative) Standard splice simulator for loss
                    calibration
                    C.1 Structure
                    C.2 Preparation of the standard splice
                        simulator
                    C.3 Calibration procedure
                    C.4 Uncertainties
                    C.5 Documentation
Annex D (informative) Mathematical basis
                       D.1 Deviations
                       D.2 Uncertainties type A
                       D.3 Uncertainties type B
                       D.4 Accumulation of uncertainties
                       D.5 Reporting
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Describes the procedures for calibrating single-mode optical time domain reflectometers (OTDR).