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GB/T 15972.41-2021Specifications for optical fibre test methods - Part 41: Measurement methods and test procedures for transmission characteristics - Bandwidth (English PDF)

光纤试验方法规范第41部分：传输特性的测量方法和试验程序带宽

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

April 30, 2021

Implementation date

November 1, 2021

Scope

GB/T 15972.41-2021 is the English-translated version of 光纤试验方法规范第41部分：传输特性的测量方法和试验程序带宽.

GB/T 15972.41-2021 is the Chinese standard "Specifications for optical fibre test methods - Part 41: Measurement methods and test procedures for transmission characteristics - Bandwidth".

Its scope clause reads: This part of GB/T 15972 specifies the test method for the bandwidth of multimode optical fiber, and establishes the test equipment, injection conditions, procedures, and calculations.

Technical requirements for methods and results. This section applies to the measurement of the bandwidth of A1, A3, and A4 multimode optical fibers. Its clauses include terms and definitions.

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Document preview — GB/T 15972.41-2021

National Standard of the People's Republic of China

Classification: M 33

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviations
5 Method overview
6 Test device
7 Samples and sample preparation
8 Procedure
9 Calculation
10 Length normalized
11 Results
Appendix A (informative appendix) Structure changes of this part compared with IEC 60793-1-41.2010
Appendix B (Normative Appendix) Intra-mode dispersion factor and normalized inter-mode dispersion limit
Appendix C (Normative Appendix) Optical fiber transfer function transfer function H(f), power spectrum |H(f)| and f3dB
Appendix D (Normative Appendix) Calculation of other expression functions
Appendix E (Normative Appendix) Mode Stirring Requirements for Full Injection of Multimode Fiber

1 Scope

This part of GB/T 15972 specifies the test method for the bandwidth of multimode optical fiber, and establishes the test equipment, injection conditions, procedures, and calculations.

Technical requirements for methods and results.

This section applies to the measurement of the bandwidth of A1, A3, and A4 multimode optical fibers.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article

Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 15972.20 Specification for optical fiber test methods Part 20.Dimensional parameter measurement methods and test procedures Optical fiber geometrical parameters (GB/T 15972.20-2021, IEC 60793-1-20.2014, MOD)

GB/T 15972.42 Specification for optical fiber test methods Part 42.Transmission characteristics and optical characteristics measurement methods and test procedures

Long dispersion (GB/T 15972.42-2021, IEC 60793-1-42.2010, MOD)

GB/T 15972.43 Specification for optical fiber test methods Part 43.Transmission characteristics and optical characteristics measurement methods and test procedures

Value aperture (GB/T 15972.43-2021, IEC 60793-1-43.2015, MOD)

IEC 60793-1-49.2018 Optical fiber Part 1-49.Measurement method and test procedure Differential mode delay (Opticalfibres-

Part 1-49.Measurementmethodsandtestprocedures-Differentialmodedelay)

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Bandwidth(-3dB)

The bandwidth value is equal to the minimum modulation frequency when the amplitude of the baseband transfer function of the fiber drops to a specific value.

The value is usually half of the amplitude corresponding to zero frequency.

Note. The bandwidth value is expressed by f3dB.

3.2 Transfer function

The frequency-dependent complex discrete function is used to characterize the frequency domain response of the fiber under test.

Note. Method A is to process the time domain data through Fourier transform to determine the frequency response. If you use a type that can measure both phase and amplitude

Device, method B can be used to measure the transfer function. When using Fourier transform, method C is similar to method A. The transfer function is represented by H(f). Here

Method A, Method B, and Method C are explained in Chapter 5.

3.3 Power spectrum

A real discrete function related to frequency, which characterizes the amplitude of the frequency domain response of the fiber under test.

Note. Method A and Method C use the transfer function to determine the power spectrum. Method B is obtained by the ratio of the measured amplitude of the tested fiber to the amplitude of the reference fiber.

YD/T 2554.1 | GB/T 9771.1 | GB/T 20186.1 | GB/T 15972.48 | GB/T 15972.40 | GB/T 15972.33 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 45 pages — is available in the English PDF.

Referenced standards

Normative references

IEC 60793

Cited by

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