GB/T 15972.48-2026Specifications for optical fibre test methods - Part 48: Measurement methods and test procedures for transmission characteristics - Polarization mode dispersion (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 48 of GB/T 15972 "Specification for Test Methods of Optical Fibers". GB/T 15972 has the following parts published.

---Part 10: General Principles of Measurement Methods and Test Procedures;

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

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

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

---Part 30: Measurement methods and test procedures for mechanical properties; Fiber optic screening test;

---Part 31: Methods and procedures for measuring mechanical properties; Tensile strength;

---Part 32: Methods and procedures for measuring mechanical properties; Coating peelability;

---Part 33: Methods and procedures for measuring mechanical properties and stress corrosion susceptibility parameters;

---Part 34: Measurement methods and test procedures for mechanical properties; fiber optic 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; cutoff wavelength;

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

--- Part 46: Measurement methods and test procedures for transmission characteristics; Transmittance variation;

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

--- Part 48: Measurement methods and test procedures for transmission characteristics; polarization mode dispersion;

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

--- Part 50: Methods of measurement and test procedures for environmental performance under constant humidity and heat;

--- Part 51: Methods and procedures for measuring and testing environmental performance (dry heat);

--- Part 52: Methods of measuring and test procedures for environmental performance; temperature cycling;

--- Part 53: Methods and procedures for measuring and testing environmental performance (immersion);

--- Part 54: Methods of measurement and test procedures for environmental performance; Gamma irradiation;

--- Part 55: Methods for measuring and testing environmental performance (hydrogen aging).

This document replaces GB/T 15972.48-2016 "Fiber Optic Test Methods Specification Part 48: Measurement of Transmission and Optical Characteristics".

The method and experimental procedure for polarization mode dispersion, compared with GB/T 15972.48-2016, mainly involves structural adjustments and editorial changes.

The techniques have changed as follows.

a) Added "symbols" (see 4.2);

b) The method for calculating the polarization state (SOP) in the Stokes parameter determination method has been removed (see 5.1.1 and Appendix A of the 2016 edition).

A.4.4);

c) The applicability description has been changed (see 5.3, 2016 edition of 5.3);

d) The requirement has been added that "for optical fibers specified in GB/T 9771, the normalized unit of PMD value is ps/km1/2" (see Chapter 9);

e) Added "Detailed Information" (see Chapter 11).

This document is modified to adopt IEC 60793-1-48:2017 "Fiber optics - Part 1-48.Measurement methods and test procedures for polarization mode dispersion".

Compared with IEC 60793-1-48:2017, this document has undergone many structural adjustments. A comparison of the structural numbering changes between the two documents is provided below.

See Appendix A for the table of contents.

The technical differences between this document and IEC 60793-1-48:2017, and the reasons therefor, are as follows.

---Change the type of single-mode fiber in the scope of application to "Category B un-cabled and cabled single-mode fiber as specified in GB/T 9771".

(See Chapter 1), which clarifies the applicability of the document and increases its operability;

--- Instead of referencing ITU-T G.650.2 for terms and definitions, list each specific term and definition (see section 3).

Chapter), enhancing the readability of the document;

Appendix B) aligns with the method names in existing telecommunications industry standards and adapts to my country's technical conditions;

---The method for calculating the polarization state (SOP) has been removed (see B.3.4) to maintain consistency with the overall technical content of the paper;

---The average PMD value is now uniformly expressed as "PMDAVG" and "PMDMEAN" as "PMDAVG" (see full text) for easier use throughout the document.

The following editorial changes have been made to this document.

---To maintain consistency with the existing GB/T 15972 series standards, the name will be changed to "Fiber Optic Testing Methods Specification Part 48".

Part 1: Measurement methods and experimental procedures for transmission characteristics; Polarization mode dispersion.

---The URLs for the ISO and IEC terminology databases have been removed;

---To facilitate domestic usage habits, the three PMD measurement methods have been numbered, including "Stokes Parameter Measurement (SPE)".

The "method" is Method 1, the "interference method" is Method 2, and the "fixed analyzer method" is Method 3.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.

Introduction

The characteristic parameters of optical fibers include geometric dimensions, mechanical properties, transmission characteristics, and environmental performance. Each category further includes...

There are multiple parameters, and these parameters are tested using different principles, equipment, and programs. Therefore, they need to be divided according to their respective parameters, and separate programs need to be written for each parameter.

The test methods are designed to facilitate reference to product standards and practical testing. GB/T 15972 is proposed to consist of twenty-five parts.

---Part 10: General Principles of Measurement Methods and Test Procedures. The aim is to standardize the general basic requirements for fiber optic testing.

---Part 20: Measurement Methods and Test Procedures for Dimensional Parameters of Fiber Optic Geometric Parameters. The purpose is to standardize the measurement of fiber optic geometric parameters.

Try different methods.

---Part 21: Measurement Methods and Test Procedures for Dimensional Parameters of Coating Geometric Parameters. The aim is to standardize the geometric parameters of fiber optic coatings.

What parameter testing method.

---Part 22: Measurement methods and test procedures for dimensional parameters. The purpose is to standardize methods for testing fiber optic length.

---Part 30: Measurement Methods and Test Procedures for Mechanical Properties - Fiber Optic Screening Test. The purpose is to standardize fiber optic screening test procedures.

Try different methods.

---Part 31: Measurement Methods and Test Procedures for Mechanical Properties (Tensile Strength). The purpose is to standardize the testing of the tensile strength of optical fibers.

method.

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

Sexual testing methods.

---Part 33: Measurement methods and test procedures for mechanical properties; stress corrosion susceptibility parameters. The aim is to standardize fiber optic stress.

Sensitivity parameter testing methods.

---Part 34: Measurement methods and test procedures for mechanical properties of fiber optic warping. The purpose is to standardize the testing methods for fiber optic warping.

---Part 40: Measurement Methods and Test Procedures for Transmission Characteristics - Attenuation. The purpose is to standardize fiber optic attenuation testing methods.

---Part 41: Measurement methods and test procedures for transmission characteristics (bandwidth). The aim is to standardize fiber optic bandwidth testing methods.

---Part 42: Measurement Methods and Test Procedures for Transmission Characteristics - Wavelength Dispersion. The purpose is to standardize fiber wavelength dispersion testing.

method.

---Part 43: Measurement Methods and Test Procedures for Transmission Characteristics - Numerical Aperture. The purpose is to standardize the numerical aperture testing of optical fibers.

method.

---Part 44: Measurement methods and test procedures for transmission characteristics, cutoff wavelength. The purpose is to standardize the testing of fiber optic cutoff wavelengths.

method.

---Part 45: Measurement Methods and Test Procedures for Transmission Characteristics (Mode Field Diameter). The purpose is to standardize the testing of fiber optic mode field diameter.

method.

---Part 46: Measurement Methods and Test Procedures for Transmission Characteristics - Transmittance Variation. The purpose is to standardize the measurement of optical fiber transmittance variation.

Try different methods.

---Part 47: Measurement Methods and Test Procedures for Transmission Characteristics - Macrobending Loss. The aim is to standardize the testing of fiber macrobending loss.

method.

---Part 48: Measurement Methods and Test Procedures for Transmission Characteristics - Polarization Mode Dispersion. The purpose is to standardize the measurement of polarization mode dispersion in optical fibers.

Try different methods.

---Part 49: Measurement Methods and Test Procedures for Transmission Characteristics - Differential Mode Delay. The purpose is to standardize the measurement of differential mode delay in optical fibers.

Try different methods.

---Part 50: Measurement Methods and Test Procedures for Environmental Performance under Constant Humidity and Heat. The aim is to standardize constant humidity and heat testing of optical fibers.

method.

---Part 51: Measurement methods and test procedures for environmental performance (dry heat). The purpose is to standardize the dry heat test methods for optical fibers.

---Part 52: Environmental Performance Measurement Methods and Test Procedures for Temperature Cycling. The aim is to standardize fiber optic temperature cycling testing.

method.

---Part 53: Measurement methods and test procedures for environmental performance (immersion). The purpose is to standardize the water immersion test methods for optical fibers.

---Part 54: Measurement methods and test procedures for environmental performance under gamma irradiation. The purpose is to standardize fiber optic gamma irradiation testing.

method.

---Part 55: Measurement methods and test procedures for environmental performance (hydrogen aging). The aim is to standardize the hydrogen aging test methods for optical fibers.

Fiber Optic Test Method Specification Part 48: Measurement of Transmission Characteristics Methods and experimental procedures for polarization mode dispersion

1 Scope

This document describes the reference test method (RTM) and other test methods for polarization mode dispersion (PMD) in single-mode fiber, and specifies the test procedures.

Uniform requirements for apparatus, injection conditions, measurement procedures, calculation methods, and results.

This document applies to the inspection of PMD characteristics of un-cabled and cabled single-mode optical fibers of Category B as specified in GB/T 9771.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 9771 (all parts) Single-mode optical fiber for communication IEC TR61282-3 Guidelines for the Design of Fiber Optic Communication Systems - Part 3: Calculation of Link Polarization Mode Dispersion (Fibreopticcom-IEC TR61282-9 Guidelines for the Design of Fiber Optic Communication Systems - Part 9: Measurement and Theory of Polarization Mode Dispersion (Fibreopticcom-theory)

3 Terms and Definitions

The following terms and definitions apply to this document.

Differential group delay (DGD) between two orthogonal polarization modes causes pulse broadening in digital systems, degrading the performance of communication systems.

This causes signal distortion in the simulated system.

For a single-mode fiber used at a given time and optical frequency, there are always two orthogonal polarization states called the principal polarization state (PSP).

If a quasi-monochromatic light excites only one PSP, pulse broadening due to polarization mode dispersion (PMD) will not occur; when a quasi-monochromatic light excites only one PSP, pulse broadening will not occur.

When these two PSPs are uniformly excited by light, maximum pulse broadening due to PMD will occur. The PSPs output from the fiber optic cable are two orthogonally polarized PSPs.

When the frequency of the input light wave changes slightly, the output polarization does not change; the corresponding orthogonal polarization state is the main input polarization state.

The time difference of group delay between two PSPs.

Note. Generally measured in picoseconds (ps).