GB/T 9771.2-2020Single-mode optical fibres for telecommunication—Part 2: Characteristics of a cut-off wavelength shifted single-mode optical fibre (English PDF)

Foreword

GB/T 9771 "Single Mode Optical Fiber for Communication" is divided into the following parts.

---Part 1: Non-dispersion shifted single-mode fiber characteristics;

---Part 2: Characteristics of cut-off wavelength shifted single-mode fiber;

---Part 3: Characteristics of non-dispersion-shifted single-mode fiber with extended wavelength band;

---Part 4: Dispersion-shifted single-mode fiber characteristics;

---Part 5: Non-zero dispersion shifted single-mode fiber characteristics;

---Part 6: Characteristics of non-zero-dispersion single-mode optical fiber for wide-wavelength optical transmission;

---Part 7: Characteristics of single-mode optical fiber with insensitive bending loss for access network.

This part is Part 2 of GB/T 9771.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

This part replaces GB/T 9771.2-2008 "Single-mode optical fiber for communication Part 2: Characteristics of single-mode optical fiber with cut-off wavelength shift".

Compared with GB/T 9771.2-2008, the main technical changes in this part are as follows.

--- Added classification and rounding rules (see Chapter 5, Chapter 6);

--- Added two sub-categories of B1.2d and B1.2e and related indicators (see Chapter 7);

--- Added 200 µm and 500 µm coating diameter and tolerance requirements, and added 200 µm fiber coating/cladding concentricity error requirements (see 7.1.1);

--- Modify the optical characteristics and transmission characteristics to transmission characteristics, and adjust the mode field diameter from the size parameter to the transmission characteristics (see 7.1, 7.2, 5.1 and 5.2 of the 2008 edition);

--- The fiber attenuation classification has been cancelled and the attenuation requirements for the wavelength of 1625 nm have been determined (see 7.2.1, 5.2.3 of the 2008 edition);

--- Increased attenuation uniformity requirements (see 7.2.4);

--- Removed the cut-off wavelength of the jumper cable (lambdacj) and modified the requirements for the cut-off wavelength of the optical fiber (see 7.2.7, 5.2.1 of the 2008 edition);

--- Modify the tension value corresponding to the screening stress (see 7.3.1, 5.3.1 of the 2008 edition);

--- Removed the tensile strength requirements for gauge lengths of 1m, 10m, and 20m (see 5.3.2 of the 2008 edition);

--- Modified the peeling force requirements of the coating layer (see 7.3.4, 7.4.3, 2008 version 5.3.4, 5.4.3);

--- Increased the requirements for the change of the light attenuation at the wavelength of 1625nm in environmental testing (see 7.4.2)

--- Increased the correspondence between GB/T 9771 and IEC standard and ITU-T standard single-mode fiber code (see Appendix A).

1 Scope

This part of GB/T 9771 stipulates the classification, rounding rules, requirements and test methods for B1.2 cut-off wavelength shifted single-mode optical fibers.

This section applies to B1.2 single-mode optical fiber used in communication optical cables and other information transmission equipment. Among them B1.2a, B1.2b, B1.2c, B1.2d are more suitable for submarine communication optical cable, B1.2e is suitable for land long-distance trunk optical cable.

Note: The fiber size parameters and transmission characteristics of this part refer to the provisions of the G.654 fiber characteristics in ITU-TG.654 (2016).The mechanical and environmental properties of the fiber Can refer to IEC 60793-2-50:2015 category B1.2 fiber regulations.

2 Normative references

The following documents are essential for the application of this document. For dated reference documents, only the dated version applies to this document. For the cited documents without date, the latest version (including all amendments) applies to this document.

GB/T 8170 Numerical Rounding Rules and Representation and Judgment of Limit Values

GB/T 15972 (all parts) specification of optical fiber test method

GB/T 33779.1 Guidelines for testing optical fiber characteristics Part 1: Attenuation uniformity

ITU-TG.650.1 Single-mode fiber optic cable linear and deterministic characteristics of parameter definition and test method (Definitionsandtest methodsforlinear,deterministicattributesofsingle-modefibreandcable)

ITU-TG.650.2 Parameter definition and test method of statistical and non-linear characteristics of single-mode optical fiber cable (Definitionsandtest methodsforstatisticalandnon-linearrelatedattributesofsingle-modefibreandcable)

3 Terms and definitions

The terms and definitions defined in GB/T 15972, GB/T 33779.1 and ITU-TG.650.1 and ITU-TG.650.2 apply to this document.

4 Acronyms

The following abbreviations apply to this document.

DWDM. Dense Wavelength Division Multiplexing

FTTH. Fiber to the Home (FibreToTheHome)

FWM. Four Wave Mixing (FourWaveMixing)

PMD. Polarization Mode Dispersion (PolarizationModeDispersion)

PMDQ. Statistical Parameter of Link Polarization Mode Dispersion Coefficient (StatisticalParameterForLinkPMD)

WDM. Wavelength Division Multiplexing

5 Classification

The zero-dispersion wavelength of the B1.2 type fiber is near 1300nm, the cut-off wavelength is moved to a longer wavelength, and it is attenuated in the 1550nm wavelength region The lowest and best working wavelength is in the range of 1530nm~1625nm.