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GB/T 18311.47-2026: Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-47: Examinations and measurements - End face geometry of PC/APC spherically polished ferrules using interferometry
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Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-47: Examinations and measurements - End face geometry of PC/APC spherically polished ferrules using interferometry
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Basic data | Standard ID | GB/T 18311.47-2026 (GB/T18311.47-2026) | | Description (Translated English) | Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-47: Examinations and measurements - End face geometry of PC/APC spherically polished ferrules using interferometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L50 | | Classification of International Standard | 33.180.20 | | Word Count Estimation | 18,199 | | Date of Issue | 2026-02-27 | | Date of Implementation | 2026-09-01 | | Older Standard (superseded by this standard) | GB/T 18311.16-2007 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 18311.47-2026: Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-47: Examinations and measurements - End face geometry of PC/APC spherically polished ferrules using interferometry
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ICS 33.180.20
CCSL50
National Standards of the People's Republic of China
Replaces GB/T 18311.16-2007
Fiber optic interconnects and passive devices
Basic test and measurement procedures
Parts 3-47.Inspection and Measurement Using Interferometry
Measuring PC/APC spherically polished pins
End face geometry
(IEC 61300-3-47.2014, IDT)
Released on February 27, 2026; to be implemented on September 1, 2026.
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Interferometry 3
4.1 Overview 3
4.2 Pin/Connector Fixture 3
4.3 Optical Interference System 4
4.4 Microscope with image acquisition camera 4
5.Interferometer performance requirements 4
5.1 XY Axis Calibration (Radius of Curvature) 4
5.2 Z-axis calibration (fiber height) 4
5.3 Alignment of the ferrule axis with the interferometer's optical axis (vertex offset calibration) 4
5.4 Tilt Angle and Locating Key Angle 4
6.Measurement Methods 4
6.1 General Rules 4
6.2 Measurement Area 5
6.3 Method for measuring radius of curvature 5
6.4 Measurement Method for End Face Sphericity (Vertex Offset) 6
6.5 Fiber Optic Height Measurement Method 6
7.Details of the regulations 8.
Appendix A (Normative) Interferometer Calibration 9
A.1 XY Axis Calibration 9
A.2 Z-axis calibration 9
A.3 Align the insert axis with the interferometer's optical axis (vertex offset calibration) 9
A.4 Tilt Angle and Locating Key Angle 9
Appendix B (Informative) Procedure for Measuring the "Angle Error" of the End Face of Angled Polished Pins 10
Appendix C (Informative) Formula for Calculating the Geometric Dimensions of the Pin End Face 11
Figure 1.Radius of curvature of the end face of the spherically polished pin (1)
Figure 2.Offset of the vertex of the spherical pin end face 2
Figure 3.Fiber height at the spherically polished ferrule end face (2)
Figure 4.Angle of the end face of the spherically polished pin (3°).
Figure 5.Interferometer 3
Figure 6.Pin end face and measurement area 5
Figure 7.Surface of the pin end face 6
Figure 8.Averaged area and assembly area of the pin end face.
Figure 9.Transformed pin end face 7
Figure 10.Transformed pin end face excluding the extraction region.
Figure B.1 Example 10 of calculating the positioning key angle error based on interference rings for a protruding polished pin.
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
GB/T 18309 "Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices - Part 1.General Principles and Guidelines"
GB/T 18310 "Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices - Part 2.Tests" and GB/T 18311
"Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices, Part 3.Inspection and Measurement" together constitute the fiber optic interconnect...
National standard system for testing methods of interconnected and passive devices.
This document is Part 3-47 of GB/T 18311 "Basic Test and Measurement Procedures for Fiber Optic Interconnect Devices and Passive Devices".
GB/T 18311 has published the following parts.
---Part 3-1.Inspection and Measurement of Visual Inspection;
---Part 3-2.Inspecting and Measuring Polarization-Dependent Loss in Single-Mode Fiber Optics;
---Part 3-3.Inspecting and Measuring Changes in Attenuation and Return Loss (Multi-channel);
---Parts 3-4.Inspecting and Measuring Attenuation;
---Parts 3-6.Inspecting and Measuring Return Loss;
---Part 3-20.Inspecting and Measuring the Directivity of Fiber Optic Splitter Devices;
---Part 3-26.Inspection and Measurement of Angular Deviation Between Fiber Optic and Briquette Axis;
---Part 3-28.Inspecting and Measuring Instantaneous Losses;
---Part 3-30.Inspecting and Measuring Polishing Angles and Fiber Positions of Single-Tube Multi-Core Fiber Optic Connectors;
---Parts 3-34.Inspecting and measuring attenuation of randomly mated connectors;
---Parts 3-47.Inspection and Measurement. The end face geometry of PC/APC spherically polished pins is measured using interferometry.
This document replaces GB/T 18311.16-2007 "Basic Test and Measurement Procedures for Fiber Optic Interconnect Devices and Passive Devices".
Preface Part 3-16.Inspection and Measurement of the End Face Radius of Spherically Polished Sleeves, compared with GB/T 18311.16-2007, except for structural adjustments
Aside from editorial changes, the main technical changes are as follows.
---The overview and apparatus (see Chapters 3 and 4 of the.2007 edition) have been removed;
---Interferometry has been added (see Chapter 4);
---Increased interferometer performance requirements (see Chapter 5);
---The measurement method has been changed (see Chapter 6, Chapter 5 in the.2007 edition);
---The details of the regulations have been changed (see Chapter 7, Chapter 6 of the.2007 edition);
---A normative appendix, "Interferometer Calibration," has been added (see Appendix A).
This document is equivalent to IEC 61300-3-47.2014 "Fundamental Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices".
Preface, Parts 3-47.Inspection and Measurement. Interferometric measurement of the end face geometry of PC/APC spherically polished pins.
The following minimal editorial changes have been made to this document.
---A new chapter on "Normative References" has been added;
---Added the symbol "A" to 3.3;
---The original title of Figure 3a) is corrected to "Fiber Height A (Fiber Recess)", which is different from Figure 3b).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
This document was drafted by. the 23rd Research Institute of China Electronics Technology Group Corporation, the China Electronics Technology Standardization Institute, and Suzhou Yizhi.
Kang Communication Equipment Co., Ltd., Jiangsu Tongguang Optical Cable Co., Ltd., Yangtze Optical Fibre and Cable Joint Stock Limited Company, Zhejiang Ronghui Communication Equipment Co., Ltd.
The companies include. Zhongtian Broadband Technology Co., Ltd., the Eighth Research Institute of China Electronics Technology Group Corporation, and AVIC Optoelectronic Technology Co., Ltd.
The main drafters of this document are. Yang Yuanxu, Pan Qian, Yang Chao, Xu Qiang, Guo Feng, Li Jing, Xu Hui, Yao Qiufeng, Xu Danli, Duan Rui, Li Xiaoli, and Yu Zhenqin.
Xiong Tingting, Zhao Rui, Chen Yu, Shen Xindong.
The release history of this document and the document it replaces is as follows.
---First published in.2007 as GB/T 18311.16-2007;
---This is the first revision.
Introduction
Fiber optic interconnects and passive devices play a crucial role in fiber optic products and applications. With the advancement of optical communication technology and products...
With the continuous emergence of new technologies, testing and measurement techniques for fiber optic interconnects and passive devices have also developed rapidly. To ensure that product testing and measurement procedures are conducted in a timely manner...
To promote international coordination and trade, the IEC has developed and published the IEC 61300 series of test and measurement procedures standards, covering...
It covers the measurement and testing of optical performance, mechanical properties, and environmental adaptability of fiber optic interconnects and passive devices, and is a leading international standard.
The basic standards for supporting product inspection and acceptance.
my country has established a standardized system of testing and measurement procedures for fiber optic interconnect devices and passive devices in accordance with the IEC 61300 series standards.
The system includes GB/T 18309 "Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices - Part 1.General Principles and Guidelines",
GB/T 18310 "Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices - Part 2.Tests" and GB/T 18311
"Basic Test and Measurement Procedures for Fiber Optic Interconnects and Passive Devices, Part 3.Inspection and Measurement" aims to establish product specifications.
It provides a complete and unified set of methodologies and standards for product testing and verification.
GB/T 18311 is proposed to consist of the following parts.
---Part 3-1.Inspection and Measurement of Appearance. The purpose is to determine the procedures for inspecting and measuring appearance.
---Part 3-2.Inspecting and Measuring Polarization-Dependent Loss in Single-Mode Fiber Optics. The aim is to determine the polarization-dependent loss.
Inspection and measurement procedures.
---Part 3-3.Dynamic monitoring of attenuation and return loss changes. The aim is to determine attenuation and return loss.
Inspection and measurement procedures for dynamic monitoring of changes.
---Parts 3-4.Inspecting and Measuring Attenuation. The purpose is to determine the procedures for inspecting and measuring attenuation.
---Parts 3-6.Checking and Measuring Return Loss. The purpose is to determine the procedures for checking and measuring return loss.
---Parts 3-7.Examining and measuring the wavelength dependence of attenuation and return loss in single-mode components. The aim is to determine the relevant product...
Procedures for checking and measuring the wavelength correlation of image attenuation and return loss.
---Part 3-11.Inspecting and Measuring Connection and Separation Forces. The purpose is to determine the procedures for inspecting and measuring connection and separation forces.
---Part 3-14.Checking and measuring the error and repeatability of the attenuation setpoint of the variable optical attenuator. The purpose is to determine the variable optical attenuator...
Procedures for checking and measuring the error and repeatability of the attenuator attenuation setpoint.
---Part 3-19.Inspecting and Measuring the Polarization Dependence of Return Loss in Single-Mode Optical Devices. The aim is to determine the return loss of relevant products.
Procedures for checking and measuring the polarization dependence of loss.
---Part 3-20.Inspecting and Measuring the Directivity of Fiber Optic Splitters. The purpose is to determine the directivity of the splitter.
Inspection and measurement procedures.
---Part 3-21.Inspecting and Measuring Switching Time. The purpose is to determine the procedures for inspecting and measuring switching time.
---Part 3-22.Checking and Measuring Pin Compression Force. The purpose is to determine the procedures for checking and measuring pin compression force.
---Part 3-25.Inspecting and measuring the concentricity of angleless ferrules and angleless ferrules with fiber optic cables. The purpose is to determine the anglelessness...
Procedures for checking and measuring the concentricity of angled pins and angleless pins with optical fibers.
---Part 3-26.Measurement of angular deviation between fiber optic and ferrule axes. The purpose is to determine the axis of the fiber optic and ferrule.
Procedures for checking and measuring angular deviation.
---Part 3-27.Inspection and Measurement of Guide Hole and Fiber Optic Hole/Core Positions in Rectangular Ferrules. The purpose is to determine the rectangular ferrule's position.
Procedures for checking and measuring the position of guide holes and fiber optic holes/cores in ferrules.
---Part 3-28.Inspecting and Measuring Instantaneous Losses. The purpose is to determine the procedures for inspecting and measuring instantaneous losses.
---Part 3-29.Inspecting and Measuring the Spectral Transfer Characteristics of DWDM Devices. The purpose is to determine the spectral transfer characteristics of relevant products.
Procedures for checking and measuring characteristics.
---Part 3-30.Inspecting and Measuring the End Face Geometry of the Rectangular Socket. The purpose is to determine the end face geometry of the rectangular socket.
Inch inspection and measurement procedures.
---Part 3-32.Inspecting and Measuring Polarization Mode Dispersion in Passive Optical Devices. The purpose is to determine the inspection and measurement of polarization mode dispersion.
Quantity program.
---Part 3-33.Inspecting and Measuring the Pull-out Force of the Elastic Alignment Sleeve for Needle Gauge Measurement. The purpose is to determine the elastic alignment of the needle gauge measurement sleeve.
Procedure for checking and measuring the pull-out force of the middle sleeve.
---Part 3-34.Inspecting and Measuring the Attenuation of the Randomly Mating Connector. The purpose is to determine the attenuation of the randomly mating connector.
Inspection and measurement procedures.
---Part 3-35.Visual inspection and measurement of optical connectors and embedded fiber optic ferrules transceivers. The purpose is to determine the optical connectors...
Procedures for inspecting and measuring the appearance of connectors and pre-embedded fiber optic transceivers.
---Part 3-36.Inspection and Measurement of the Inner and Outer Diameters of Optical Connector Pins. The purpose is to determine the inner and outer diameters of the pins.
Quantity inspection and measurement procedures.
---Part 3-37.Inspecting and Measuring the End Face Angle of Angle-Polished Fiber End Faces. The purpose is to determine the end face angle of angle-polished fiber end faces.
Procedures for inspecting and measuring end face angles.
---Part 3-38.Inspecting and Measuring Group Delay, Dispersion, and Phase Fluctuations. The aim is to determine group delay, dispersion, and phase fluctuations.
Inspection and measurement procedures.
---Part 3-39.Inspection and Measurement of the Selection of Physical Contact (PC) Standard Plugs for Return Loss Testing. The purpose is to determine...
Inspection and measurement procedures for selecting physical contact (PC) standard plugs for return loss testing.
---Part 3-42.Inspect and measure the attenuation of the single-mode centering sleeve or adapter with a flexible centering sleeve. The purpose is to determine the single-mode attenuation.
Attenuation checking and measurement procedures for centering sleeves or adapters with flexible centering sleeves.
---Part 3-43.Inspection and Measurement of the Light Source Mode Transfer Function. The purpose is to determine the inspection of the light source mode transfer function.
Check and measurement procedures.
---Part 3-45.Inspecting and Measuring the Attenuation of Randomly Mated Multi-core Optical Connectors. The purpose is to determine the attenuation of randomly mated multi-core optical connectors.
Procedures for checking and measuring connector attenuation.
---Part 3-46.Inspecting and Measuring the Inner Diameter of the MT Socket. The purpose is to determine the inner diameter of the MT socket through inspection and measurement.
Quantity program.
---Part 3-47.Inspection and Measurement. The end-face geometry of PC/APC spherically polished pins is measured using interferometry.
The key is to determine the inspection and measurement procedures for measuring the end face geometry of PC/APC spherically polished pins using interferometry.
---Part 3-48.Inspecting and Measuring the Elastic Compressive Force of the Connecting Sleeve in a Rectangular Molded Multi-Core Connector. The purpose is to determine the rectangular ferrule...
Procedure for checking and measuring the elastic compressive force of the connecting sleeve in a multi-core ferrule connector.
---Part 3-49.Inspecting and Measuring the Retention Force of Guide Pins in Rectangular Folds of Multi-core Optical Connectors. The purpose is to determine the retention force of the rectangular ferrule.
Procedure for checking and measuring the holding force of the guide pin in the core.
---Part 3-50.Inspecting and Measuring Crosstalk in Optical Spatial Switches. The purpose is to determine the inspection and measurement of crosstalk in optical spatial switches.
Quantity program.
---Part 3-51.Inspecting and Measuring the Pin Pull-out Force of Rectangular Ferrules in Multi-Core Optical Connectors. The purpose is to determine the pin pull-out force of the rectangular ferrule.
Procedure for checking and measuring needle pull-out force.
---Part 3-52.Inspecting and Measuring Angular Physical Contact (APC) Deformation of Guide Holes and Alignment Guide Pins in Rectangular Ferrules
The purpose is to determine the procedures for checking and measuring deformation constants.
---Parts 3-53.Inspecting and Measuring Circular Angular Flux (EAF) Based on Two-Dimensional Far-Field Data in Multimode Waveguides (Including Optical Fibers)
Measurement methods. The purpose is to determine the inspection and measurement procedures for annular angular flux.
---Part 3-54.Inspecting and measuring the angular deviation between the pin bore shaft and the pin shaft in cylindrical pins. The purpose is to determine the angular deviation between the pin bore shaft and the pin shaft.
Procedure for checking and measuring the angular deviation between the inner hole shaft and the shaft of the cylindrical insert.
---Part 3-55.Inspecting and measuring the polarization extinction ratio and bond accuracy of polarization-preserving passive devices. The purpose is to determine the polarization...
Procedures for checking and measuring extinction ratio and key position accuracy.
Fiber optic interconnects and passive devices
Basic test and measurement procedures
Parts 3-47.Inspection and Measurement Using Interferometry
Measuring PC/APC spherically polished pins
End face geometry
1 Scope
This document describes a method for measuring the geometry of the end face of a spherically polished pin or connector. The term "pin" as used in this document refers to...
The connectors are interchangeable.
2 Normative references
This document has no normative references.
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
radius of curvature
The radius of the spherical surface of the part of the pin that makes physical contact with the polished end face of the sphere.
Note. It is usually assumed that the end face of the pin is spherical, but in reality the end face is usually non-spherical (see Figure 1).
Figure 1.Radius of curvature of the end face of the spherically polished pin
3.2
Vertex offset apexoffset
The distance between the central axis of the pin and the parallel line passing through the vertex (or the highest point of the dome) is caused by the end-face polishing process, as shown in Figure 2.
As shown.
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