GB/T 15972.49-2021Specifications for optical fibre test methods - Part 49: Measurement methods and test procedures for transmission characteristics - Differential mode delay (English PDF)
光纤试验方法规范 第49部分：传输特性的测量方法和试验程序 微分模时延
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 15972.49-2021 is the English-translated version of 光纤试验方法规范 第49部分：传输特性的测量方法和试验程序 微分模时延.
GB/T 15972.49-2021 is the Chinese standard "Specifications for optical fibre test methods - Part 49: Measurement methods and test procedures for transmission characteristics - Differential mode delay".
Its scope clause reads: This part of GB/T 15972 describes the test method of optical fiber differential mode delay, and establishes the test equipment, injection conditions, procedures, and calculations.
Uniform requirements for calculation methods and results. This part is applicable to the measurement of differential mode delay of A1 graded index multimode fiber.
The test methods determined in this section are generally used in indoor environments and are not suitable for operation in the field. Note. Gigabit Ethernet system uses laser as light source.
When this system uses type A1 multimode fiber as the transmission medium, the measurement result of differential mode delay is To evaluate the bandwidth performance of multimode fiber under this application condition. Its clauses include terms and definitions.
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Document preview — GB/T 15972.49-2021
National Standard of the People's Republic of China
- Classification
- M 33
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Abbreviations
- 5 Method overview
- 6 Device
- 6.1 Overview
- 6.2 Light source
- 6.3 Scanning pigtail
- 6.4 Scanning table
- 6.5 Coupling of scanning pigtail and fiber under test
- 6.6 Stripping of the cladding mold
- 6.7 Detection system
- 6.8 Sampling and data processing
- 6.9 Computing device
- 6.10 System performance
- 7 Sampling and samples
- 7.1 Sample
- 7.2 Sample end face
- 7.3 Sample length
- 7.4 Sample placement
- 7.5 Sample positioning
- 8 Procedure
- 8.1 Fiber coupling and system setup
- 8.2 Determination of the optical center of the fiber
- 8.3 Sample test
- 8.4 Determination of deltaTPULSE and deltaTREF
- 8.5 Benchmark test method
- 9 Calculation and explanation of results
- 9.1 Overview
- 9.2 Differential Modular Delay (DMD)
- 9.3 Minimum calculated effective mode bandwidth (minEMBc)
- 9.4 Length normalization
- 10 Results
- 10.1 Information to be reported
- 10.2 Information to be provided when needed
- Appendix A (Normative Appendix) Light source spectrum width limit
- Appendix B (informative appendix) Determination of fiber optics center
- Appendix C (Normative appendix) Measurement of detection system mode
- Appendix D (informative appendix) Measurement discussion
- Appendix E (informative appendix) Determining the DMD weight when calculating EMBc
- Appendix F (informative appendix) Calculation of EMBc
1 Scope
This part of GB/T 15972 describes the test method of optical fiber differential mode delay, and establishes the test equipment, injection conditions, procedures, and calculations.
Uniform requirements for calculation methods and results.
This part is applicable to the measurement of differential mode delay of A1 graded index multimode fiber.
The test methods determined in this section are generally used in indoor environments and are not suitable for operation in the field.
Note. Gigabit Ethernet system uses laser as light source. When this system uses type A1 multimode fiber as the transmission medium, the measurement result of differential mode delay is
To evaluate the bandwidth performance of multimode fiber under this application condition.
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 14733.12 Telecom terminology optical fiber communication [GB/T 14733.12-2008, IEC 60050(731).2008, IDT]
GB/T 15972.22 Optical fiber test method specification Part 22.Dimension parameter measurement method and test procedure length (GB/T 15972.22-2008, IEC 60793-1-22.2001, MOD)
GB/T 15972.41 Optical fiber test method specification Part 41.Transmission characteristics and optical characteristics measurement methods and test procedures
Wide (GB/T 15972.41-2021, IEC 60793-1-41.2010, MOD)
IEC 61280-1-4 Optical Fiber Communication Subsystem Test Procedure Part 1-4.General Communication Subsystem Light Source Encircled Flux Test Method (Fibreopticcommunicationsubsystemtestprocedures-Part 1-4.Generalcommunicationsubsys- tems-Lightsourceencircledfluxmeasurementmethod)
3 Terms and definitions
The following terms and definitions defined in GB/T 14733.12 apply to this document.
3.1 Radial scan position inner limit
RINNER The inner limit of the radial offset position when the scanning pigtail is scanned radially on the end face of the fiber under test.
3.2 Outer limit of radial scan position
ROUTER The outer limit of the radial offset position when the scanning pigtail is scanned radially on the end face of the tested fiber.
3.3 Differential mode delay; DMD
Between the fastest and slowest modes excited at all radial offset positions between RINNER and ROUTER (including RINNER and ROUTER)
Estimated difference in optical pulse delay.
YD/T 2554.1 | GB/T 9771.1 | GB/T 20186.1 | GB/T 15972.48 | GB/T 15972.40 | GB/T 15972.42 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 54 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 14733.12Terminology for telecommunication -- Optical communication
- GB/T 14733.12-2008Terminology for telecommunication -- Optical communication
- GB/T 15972.22Specifications for optical fibre test methods -- Part 22: Measurement methods and test procedures for dimensions -- Length measurement
- GB/T 15972.22-2008Specifications for optical fibre test methods -- Part 22: Measurement methods and test procedures for dimensions -- Length measurement
- GB/T 15972.41Specifications for optical fibre test methods - Part 41: Measurement methods and test procedures for transmission characteristics - Bandwidth
- GB/T 15972.41-2021Specifications for optical fibre test methods - Part 41: Measurement methods and test procedures for transmission characteristics - Bandwidth
IEC 60050 · IEC 60793 · IEC 61280
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Related Standards
GB/T 14733.12-2008 — Terminology for telecommunication -- Optical communication
GB/T 15972.22-2008 — Specifications for optical fibre test methods -- Part 22: Measurement methods and test procedures for dimensions -- Length measurement
GB/T 15972.41-2021 — Specifications for optical fibre test methods - Part 41: Measurement methods and test procedures for transmission characteristics - Bandwidth
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GB/T 15972.49-2021
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