I.S. EN 61746:2005

FOREWORD
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Calibration test requirements
   4.1 Preparation
   4.2 Test conditions
   4.3 Traceability
5 Distance calibration - General
   5.1 Location error model
   5.2 Using the calibration results
   5.3 Measuring fibre length
6 Distance calibration methods
   6.1 External source method
   6.2 Concatenated fibre method
   6.3 Recirculating delay line method
7 Loss calibration - General
   7.1 Determination of the displayed power level F
   7.2 Selection of an appropriate reference loss A[ref]
   7.3 Development of a test plan
   7.4 Polarization dependence
   7.5 Calculation of the calibration results
   7.6 Using the calibration results
8 Loss calibration methods
   8.1 Loss calibration with fibre standard
   8.2 External source method
   8.3 Splice simulator method
   8.4 Power reduction method
9 Reflectance calibration
   9.1 Reflectance measurements
   9.2 Use of the backscatter parameter, K
   9.3 Range of reflectance measurement
   9.4 Development of a test plan
   9.5 Equipment
   9.6 Measurement procedure
10 Documentation
   10.1 Measurement data and uncertainties
   10.2 Test conditions
Annex A (normative) Recirculating delay line for
        distance calibration
Annex B (normative) Optical fibre standard for loss
        calibration
Annex C (normative) Standard splice simulator for loss
        calibration
Annex D (informative) Mathematical basis
Annex E (normative) Reflectance standard
Annex F (normative) Simple version of reflectance standard
Annex G (informative) OTDR basis: Backscatter theory - Reflectance
        measurements using an OTDR - Determination of fibre
        backscatter parameter
Bibliography

Gives procedures for calibrating single-mode optical time domain reflectometers (OTDR). Covers OTDR measurement errors and uncertainties.