GB/T 15972.40-2024Specifications for optical fibre test methods - Part 40: Measurement methods and test procedures for transmission characteristics - Attenuation (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 40 of GB/T 15972 "Specification for optical fiber test methods". GB/T 15972 has been published in the following parts.

--- Part 10: General principles for measurement methods and test procedures;

--- Part 20: Measurement methods and test procedures for dimensional parameters Optical fiber geometric parameters;

--- Part 21: Measurement methods and test procedures for dimensional parameters --- Geometric parameters of coatings;

--- Part 22: Measurement methods and test procedures for dimensional parameters --- Length;

--- Part 30: Measurement methods and test procedures for mechanical properties. Optical fiber screening tests;

--- Part 31: Measurement methods and test procedures for mechanical properties Tensile strength;

--- Part 32: Measurement methods and test procedures for mechanical properties. Strippability of coatings;

--- Part 33: Measurement methods and test procedures for mechanical properties Stress corrosion sensitivity parameters;

--- Part 34: Measurement methods and test procedures for mechanical properties of optical fiber warping;

--- Part 40: Measurement methods and test procedures for transmission characteristics attenuation;

--- Part 41: Measurement methods and test procedures for transmission characteristics bandwidth;

--- Part 42: Measurement methods and test procedures for transmission characteristics Wavelength dispersion;

--- Part 43: Measurement methods and test procedures for transmission characteristics Numerical aperture;

--- Part 44: Measurement methods and test procedures for transmission characteristics and optical properties Cut-off wavelength;

--- Part 45: Measurement methods and test procedures for transmission characteristics Mode field diameter;

--- Part 46: Measurement methods and test procedures for transmission and optical properties --- Changes in transmittance;

--- Part 47: Measurement methods and test procedures for transmission characteristics Macrobending losses;

--- Part 48: Measurement methods and test procedures for transmission characteristics and optical properties Polarization mode dispersion;

--- Part 49: Measurement methods and test procedures for transmission characteristics Differential mode delay;

--- Part 50: Measurement methods and test procedures for environmental performance --- Steady state damp heat;

--- Part 51: Measurement methods and test procedures for environmental performance --- Dry heat;

--- Part 52: Measurement methods and test procedures for environmental performance --- Temperature cycling;

--- Part 53: Measurement methods and test procedures for environmental performance --- Immersion in water;

--- Part 54: Measurement methods and test procedures for environmental performance Gamma irradiation;

--- Part 55: Measurement methods and test procedures for environmental properties. Hydrogen aging this document replaces GB/T 15972.40-2008 "Optical Fiber Test Methods Specification Part 40: Measurement of Transmission Characteristics and Optical Characteristics" Compared with GB/T 15972.40-2008, in addition to structural adjustments and editorial changes, the main technical changes are the following.

a) Added the provisions on optical fiber attenuation uniformity (see 3.5 and 4.4);

b) Added environmental conditions for measurement and testing (see Chapter 6);

c) Added detailed provisions for filtering out higher-order modes in B6 type optical fibers (see A.2.2.4);

d) The applicable fiber types for the A1 multimode fiber injection conditions have been changed to not be limited to the graded-index type (see A.2.3, 2008 edition).

A.1.3);

e) Added detailed provisions on the test length for category A1 multimode optical fiber attenuation (see A.2.3.1);

f) Modified the optical injection regulations for category A1 multimode optical fibers (see A.2.3.3, A.1.3.2 of the 2008 edition);

g) Added the example of A1 multimode optical fiber mode scrambler (see A.2.3.4);

h) The applicable optical fiber types of A2, A3 and A4 multimode optical fiber injection devices are changed and are not limited to the step-change refractive index type (see A.2.4, A.1.4 of the 2008 edition);

i) Added the calibration requirements for type A4 multimode optical fibre in method A (see A.2.5.2);

j) Added calibration requirements for Method B (see B.2.3);

k) The detailed provisions of Method C test have been changed, and the content of the note has been changed to the main text (see C.2.6, C.1.5 of the 2008 edition);

l) The sample handling details of Method C have been changed, and the content of the note has been changed to the main text (see C.3, C.2 of the 2008 edition);

m) Added calibration requirements for Method C (see C.4.7);

n) Added an example of measurement results for a short section of A1 multimode optical fiber (see Appendix E);

o) Added an example of the spectral attenuation model method (see Appendix F).

This document modifies and adopts IEC 60793-1-40:2019 "Optical Fiber Part 1-40.Measurement Methods and Test Procedures for Attenuation".

This document has the following structural adjustments compared to IEC 60793-1-40:2019.

--- 4.1 in Chapter 4 corresponds to paragraphs 2 to 6 of the main text of Chapter 1 in IEC 60793-1-40:2019, and 4.2 corresponds to A.1, 4.3 in IEC 60793-1-40:2019 corresponds to B.1, 4.4 in IEC 60793-1-40:2019 corresponds to IEC 60793-1-40.

C.1, 4.5 in 2019 correspond to D.1 in IEC 60793-1-40:2019;

--- Chapter 6 corresponds to Chapter 4 and Chapter 6 of IEC 60793-1-40:2019;

--- Chapter 10 corresponds to Chapter 10 and Chapter 11 of IEC 60793-1-40:2019.

The technical differences between this document and IEC 60793-1-40:2019 and their reasons are as follows.

--- The scope of application has been expanded to include Category C single-mode optical fiber (see Chapter 1) to provide guidance for application;

--- GB/T 15972.10-2021, GB/T 15972.22-2008 and GB/T 15972.43-2021 respectively with normative references Replaced IEC 60793-1-1:2017, IEC 60793-1-22:2001, IEC 60793-1-43:2015, the difference between the two documents the degree of consistency is modification;

--- Added GB/T 33779.1 to adapt to my country's technical conditions and improve operability;

--- Replaced IEC 60793-1-22:2001 with the normative reference GB/T 15972.22-2008, consistency between the two documents the degree of modification is to adapt to my country's technical conditions and improve operability;

--- Replaced IEC 60793-1-43 with the normative reference GB/T 15972.43 to adapt to my country's technical conditions and improve operability;

--- Deleted the absolute value symbol of the attenuation definition formula (see 3.1) to guide application;

--- Added provisions for optical fiber attenuation uniformity measurement (see 3.5 and 4.4) to guide application;

--- Added environmental conditions for measurement and testing (see Chapter 6) to guide application;

--- The results are deleted from the content related to Method C (see Chapter 10) to avoid duplication with the provisions of Appendix C;

--- Change the short section of optical cable in Appendix E to short section of optical fiber (see Appendix E), and correct the description error in the IEC document;

--- Added an example of the spectral attenuation model method (see Appendix F) to guide application.

The following editorial changes were made to this document.

--- Change the name of the standard to "Optical Fiber Test Methods Specification Part 40: Measurement Methods and Test Procedures for Transmission Characteristics Attenuation".

Introduction

The characteristic parameters of optical fiber include geometric size parameters, mechanical performance parameters, transmission characteristic parameters and environmental performance. Each category includes There are many parameters. The test principles, equipment and procedures of these parameters are different. Therefore, they need to be divided according to their respective parameters and written separately.

Test methods are provided to facilitate product standard reference and actual test use. GB/T 15972 consists of 25 parts.

--- Part 10: General principles for measurement methods and test procedures. The purpose is to provide general basic requirements for optical fiber testing.

--- Part 20: Measurement methods and test procedures for dimensional parameters Optical fiber geometric parameters. The purpose is to give the measurement methods and test procedures for dimensional parameters of optical fiber geometric parameters.

Try method.

--- Part 21: Measurement methods and test procedures for dimensional parameters Coating geometric parameters. The purpose is to give the optical fiber coating geometry.

What parameter test method is used?

--- Part 22: Measurement methods and test procedures for dimensional parameters Length. The purpose is to give the optical fiber length test method.

--- Part 30: Measurement methods and test procedures for mechanical properties Optical fiber screening test. The purpose is to give the measurement methods and test procedures for optical fiber screening test.

Try method.

--- Part 31: Measurement methods and test procedures for mechanical properties Tensile strength. The purpose is to give the tensile strength test method for optical fibers method.

--- Part 32: Measurement methods and test procedures for mechanical properties Coating strippability. The purpose is to give the strippability of optical fiber coatings.

Sex testing method.

--- Part 33: Mechanical properties measurement methods and test procedures Stress corrosion sensitivity parameters. The purpose is to give the optical fiber stress Sensitivity parameter testing method.

--- Part 34: Measurement methods and test procedures for mechanical properties of optical fiber warpage. The purpose is to give the optical fiber warpage test method.

--- Part 40: Measurement methods and test procedures for transmission characteristics attenuation. The purpose is to give the optical fiber attenuation test method.

--- Part 41: Measurement methods and test procedures for transmission characteristics Bandwidth. The purpose is to provide a method for testing optical fiber bandwidth.

--- Part 42: Transmission characteristics measurement methods and test procedures wavelength dispersion. The purpose is to give the optical fiber wavelength dispersion test method.

--- Part 43: Measurement methods and test procedures for transmission characteristics Numerical aperture. The purpose is to give the numerical aperture test of optical fiber method.

--- Part 44: Transmission characteristics and optical properties of the measurement methods and test procedures Cut-off wavelength. The purpose is to give the fiber cut-off wavelength.

Wavelength test method.

--- Part 45: Transmission characteristics measurement methods and test procedures Mode field diameter. The purpose is to give the optical fiber mode field diameter test method.

--- Part 46: Transmission characteristics and optical properties measurement methods and test procedures Transmittance change. The purpose is to give the optical fiber transmission Light rate variation test method.

--- Part 47: Measurement methods and test procedures for transmission characteristics Macrobending loss. The purpose is to give the optical fiber macrobending loss test method.

--- Part 48: Measurement methods and test procedures for transmission characteristics and optical properties Polarization mode dispersion. The purpose is to give the polarization mode dispersion of optical fibers.

Mode dispersion test method.

--- Part 49: Measurement methods and test procedures for transmission characteristics Differential mode delay. The purpose is to give the measurement methods and test procedures for differential mode delay of optical fibers.

Try method.

--- Part 50: Measurement methods and test procedures for environmental performance, constant humidity and heat. The purpose is to give the constant humidity and heat test method for optical fiber method.

--- Part 51: Measurement methods and test procedures for environmental performance Dry heat. The purpose is to give the optical fiber dry heat test method.

--- Part 52: Environmental performance measurement methods and test procedures Temperature cycling. The purpose is to give the optical fiber temperature cycle test method.

--- Part 53: Measurement methods and test procedures for environmental performance - Water immersion. The purpose is to give the test method for optical fiber immersion in water.

--- Part 54: Measurement methods and test procedures for environmental performance Gamma irradiation. The purpose is to give the optical fiber gamma irradiation test method.

--- Part 55: Measurement methods and test procedures for environmental performance Hydrogen aging. The purpose is to give the optical fiber hydrogen aging test method.

This document is Part 40 of GB/T 15972.Fiber attenuation is a measure of the degree to which the optical power decreases when light propagates through an optical fiber.

Attenuation is a parameter that directly affects the transmission distance.

Specification for optical fiber test methods Part 40: Methods of measurement of transmission characteristics and Test procedure decay

1 Scope

This document specifies the test method for the attenuation characteristics of optical fibers and establishes the unified requirements for the test apparatus, injection conditions, procedures, calculation methods and results.

One requirement.

This document is applicable to the attenuation characteristic measurement of Category A multimode optical fiber, Category B single-mode optical fiber and Category C single-mode optical fiber.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 15972.10-2021 Fiber optic test method specification Part 10: General principles for measurement methods and test procedures (IEC 60793-1-1:2017,MOD) GB/T 15972.22-2008 Specification for optical fiber test methods Part 22: Measurement methods and test procedures for dimensional parameters - Length Degree (IEC 60793-1-22:2001, MOD) GB/T 15972.43-2021 Specification for optical fiber test methods Part 43: Measurement methods and test procedure values for transmission characteristics Aperture (IEC 60793-1-43:2015, MOD) GB/T 33779.1 Optical fiber characteristics test guide Part 1: Attenuation uniformity IEC 61746-1 Calibration of optical time domain reflectometers Part 1: Calibration of optical time domain reflectometers for single-mode optical fibres IEC 61746-2 Calibration of optical time domain reflectometers Part 2: Calibration of optical time domain reflectometers for multimode optical fibres

3 Terms and definitions

The following terms and definitions apply to this document.

Attenuation

The attenuation A(lambda) between two cross sections 1 and 2 at a distance L from each other on a section of optical fiber at a wavelength lambda is defined as shown in formula (1).

A(lambda)=10lg

P1(lambda)

P2(lambda)

Where.

A(lambda)---attenuation when the wavelength is lambda, in decibels (dB);

P1(lambda)---The optical power passing through the first cross section, in milliwatts (mW);

P2(lambda)---The light power passing through the second cross section, in milliwatts (mW).