ДСТУ EN 61746-1:2022 Калібрування оптичних рефлектометрів у часовій області (OTDR). Частина 1. OTDR для одномодових волокон (EN 61746-1:2011, IDT; IEC 61746-1:2009, IDT)



ДСТУ EN 61746-1:2022
(EN 61746-1:2011, IDT; IEC 61746-1:2009, IDT)

Калібрування оптичних рефлектометрів у часовій області (OTDR).
Частина 1. OTDR для одномодових волокон

 

 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Introduction

1 Scope

2 Normative references

3 Terms, definitions and symbols

4 Preparation for calibration

4.1 Organization

4.2 Traceability

4.3 Preparation

4.4 Test conditions

4.5 Documentation

5 Distance calibration - General

5.1 General

5.2 Location deviation model

5.3 Using the calibration results

5.4 Measuring fibre length

6 Distance calibration methods

6.1 General

6.2 External source method

6.2.1 Short description and advantage

6.2.2 Equipment

6.2.3 Calibration of the equipment

6.2.4 Measurement procedure

6.2.5 Calculations and results

6.2.6 Uncertainties

6.3 Concatenated fibre method

6.3.1 Short description and advantages

6.3.2 Equipment

6.3.3 Measurement procedures

6.3.4 Calculations and results

6.3.5 Uncertainties

6.4 Recirculating delay line method

6.4.1 Short description and advantage

6.4.2 Equipment

6.4.3 Measurement procedure

6.4.4 Calculations and results

6.4.5 Uncertainties

7 Loss calibration - General

7.1 General

7.2 Determination of the displayed power level F

7.3 Selection of an appropriate reference loss Lref

7.4 Development of a test plan

7.5 Polarization dependence

7.6 Calculation of the calibration results

7.7 Using the calibration results

8 Loss calibration methods

8.1 General

8.2 Fibre standard method

8.2.1 Short description and advantage

8.2.2 Equipment

8.2.3 Measurement procedure

8.2.4 Calculations and results

8.2.5 Uncertainties

8.3 External source method (see Figure 16)

8.3.1 Short description and advantage

8.3.2 Equipment

8.3.3 Calibration of the reference loss

8.3.4 Measurement procedure

8.3.5 Calculations and results

8.3.6 Uncertainties

8.4 Splice simulator method

8.4.1 Short description and advantage

8.4.2 Equipment

8.4.3 Procedure

8.4.4 Calculations and results

8.4.5 Uncertainties

8.5 Power reduction method

8.5.1 Short description and advantage

8.5.2 Equipment

8.5.3 Measurement procedure

8.5.4 Calculations and results

8.5.5 Uncertainties

9 Reflectance calibration

9.1 Objective

9.2 Reflectance measurements (see Figure 23)

9.3 Use of the backscatter parameter, K

9.4 Range of reflectance measurement

9.5 Development of a test plan

9.6 Equipment

9.7 Measurement procedure

9.7.1 Preparation

9.7.2 Taking reflectance measurements

9.7.3 Calculation and results

9.7.4 Uncertainties

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 (normative) 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