GB/T 9771.4-2020 in English
VALIDSingle-mode optical fibres for telecommunication-Part 4: Characteristics of a dispersion shifted single-mode optical fibre
- Issued on:2020-06-02
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$185.00
《GB/T 9771.4-2020通信用单模光纤 第4部分：色散位移单模光纤特性》由TC485（全国通信标准化技术委员会）归口，主管部门为工业和信息化部（通信）。
Introduction
Standard Evolution and Background
GB/T9771.4-2020, as an important part of my country's single-mode optical fiber standard system for communications, replaces the 2008 version of the standard. This standard systematically upgrades the technical specifications of dispersion-shifted single-mode optical fiber (category B2), mainly to meet the stringent requirements of DWDM systems on optical fiber dispersion characteristics.
Comparative Analysis of Core Parameters
| Technical Dimension | 2008 Edition | 2020 Edition | Technical Significance |
|---|---|---|---|
| Coating Diameter | 245±10μm | New 200/500μm Specifications | Adapt to Special Scenarios such as FTTH |
| Attenuation Uniformity | Not Specified | ≤0.05dB/km | Improve Long-Distance Transmission Stability |
| Screening Stress | 0.69GPa(≈5N) | 0.69GPa(≈8.8N) | Correct tension conversion error |
| PMD coefficient | B2a:0.5ps/√km | B2b:0.2ps/√km | Support 100G+ high-speed system |
Detailed explanation of key transmission characteristics
Dispersion characteristics optimization
The standard subdivides B2 type optical fiber into:
- B2a type: 1525-1575nm dispersion ≤3.5ps/(nm·km)
- B2b type: New 1460-1575nm nonlinear suppression indicator
Typical case: In C-band DWDM systems, B2b fiber can effectively suppress the four-wave mixing (FWM) effect by controlling the dispersion slope (≤0.085ps/(nm²·km)).
Implementation recommendations
- Maritime optical cable: It is recommended to select 200μm coated optical fiber, and special attention should be paid to the 10μm concentricity requirement
- Data center: B2b optical fiber is preferred, and its PMD coefficient of 0.2ps/√km is more suitable for 400G system
- Test verification: Attenuation uniformity test should be performed in accordance with GB/T33779.1 for 2000m segment evaluation
Standard association system
This part keeps technical synchronization with IEC 60793-2-50 and ITU-T G.653. For specific model correspondence, see Appendix A of the standard. It is worth noting that the technical indicators of B2b optical fiber have exceeded the requirements of G.653.A and reached the level of G.653.B.
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