GB/T 33779.3-2021Guidance for special characteristic of optical fibre—Part 3: Effective area (Aeff) (English PDF)
光纤特性测试导则 第3部分：有效面积(Aeff)
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
April 30, 2021
Implementation date
August 1, 2021
Scope
GB/T 33779.3-2021 is the English-translated version of 光纤特性测试导则 第3部分：有效面积(Aeff).
GB/T 33779.3-2021 is the part of the Chinese series on the special characteristics of optical fibre that covers the effective area, Aeff. It specifies the reference test method and the alternative test methods, with the test equipment, the samples and their preparation, the procedure, the calculation and the determination of the result.
It applies to the class B single-mode fibres specified in GB/T 9771. Fibre and cable makers and their laboratories use it. Issued on 30 April 2021, it has applied since 1 August 2021.
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Document preview — GB/T 33779.3-2021
National Standard of the People's Republic of China
- ICS
- 33.180.10
- Classification
- M 33
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Abbreviations
- 5 Test method
- 6 Test device
- 7 Sample
- 8 Test Procedure
- 9 Calculation method
- 10 Results
- Appendix A (informative appendix) The relationship between the effective area of a single-mode fiber and the mode field diameter
- Appendix B (Normative Appendix) Method A---Direct Far-Field Scanning Method
- Appendix C (Normative Appendix) Method B---Far Field Variable Aperture Method
- Appendix D (Normative Appendix) Method C---Near Field Scanning Method
Foreword
GB/T 33779 "Guidelines for Testing Optical Fiber Characteristics" is divided into the following parts.
---Part 1: Attenuation uniformity;
---Part 2: OTDR backscattering curve analysis;
---Part 3: Effective area (Aeff). This part is Part 3 of GB/T 33779.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This part of GB/T 33779 specifies the benchmark test method (RTM) and alternative test methods for the effective area (Aeff) of single-mode fiber.
The test equipment, samples and sample preparation, test procedures, calculation methods and results are determined.
This section applies to the Class B single-mode fiber specified in GB/T 9771 (all parts).
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 document. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 9771 (all parts) Single-mode optical fiber for communication
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Effectivearea
Aeff A parameter closely related to fiber nonlinearity, which will affect the transmission quality of fiber optic systems, especially in long-distance optical amplification systems The transmission quality, the effective area Aeff can be defined by equation (1). 2piintegral Ir()rdr[] 2 I r() 2rdr (1) Where.
I(r)---The near-field field intensity distribution of the fundamental mode of the optical fiber at the radius r.
Note 1.I(r) is integrated over the entire fiber cross section.
Note 2.For single-mode fiber, the relationship between the effective area (Aeff) and the mode field diameter (MFD) can be found in Appendix A.
3.2 Non-linear coefficient
For a particularly strong light field, the refractive index of the fiber is related to the intensity of the light in the fiber, which is expressed as formula (2). Application in high power density system When the optical fiber is nonlinear, the system performance will be degraded. The nonlinear coefficient is defined as n2/Aeff.
Where. n ---refractive index; n0 --- the linear part of the refractive index; n2---nonlinear refractive index coefficient; I ---Intensity of light in the optical fiber.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
Referenced standards
Normative references
GB/T 9771
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Related Standards
GB/T 9771.1-2008 — Single-mode optical fibres for telecommunication -- Part 1: Characteristics of a dispersion unshifted single-mode optical fibre
GB/T 9771.1-2020 — Single-mode optical fibres for telecommunication—Part 1: Characteristics of a dispersion unshifted single-mode optical fibre
GB/T 9771.2-2020 — Single-mode optical fibres for telecommunication—Part 2: Characteristics of a cut-off wavelength shifted single-mode optical fibre
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