GB/T 9771.4-2020Single-mode optical fibres for telecommunication—Part 4: Characteristics of a dispersion shifted single-mode optical fibre (English PDF)

Foreword

GB/T 9771 "Single Mode Optical Fiber for Communication" is divided into the following 7 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 section is Part 4 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 9771.4-2008 "Single-mode optical fiber for communication Part 4: Dispersion-shifted single-mode optical fiber characteristics".

Compared with GB/T 9771.4-2008, the main technical changes are as follows.

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

--- Added 200µm and 500µm coating diameters and tolerances, 200µm fiber coating 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);

--- Removed the attenuation coefficient requirement for the 1625nm wavelength (see 5.2.3 of the 2008 edition)

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

--- Removed the note about the cut-off wavelength of the jumper cable (lambdacj) and the cut-off wavelength of the fiber under special circumstances (see 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 requirement of environmental attenuation of 1625nm wavelength light attenuation (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 specifies the classification, rounding rules, and performance of dispersion-shifted single-mode fiber (hereinafter referred to as B2 single-mode fiber) Requirements and test methods.

This section applies to B2 single-mode optical fibers used in communications optical cables and other information transmission equipment.

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, 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 PMD coefficient (Statistical parameter for link PMD)

5 Classification

The zero-dispersion wavelength of Class B2 single-mode fiber is around 1550nm, and the optimal operating wavelength is in the 1550nm region. Certain B2 single mode The fiber design type can also support the application of coarse wavelength division multiplexing from 1460nm to 1625nm.

B2 single-mode fiber is divided into two sub-categories of B2a and B2b according to the dispersion characteristics.

Note: For the correspondence between GB/T 9771 and the single-mode fiber codes in the IEC and ITU-T standards, see Appendix A.