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GB/T 33779.2-2017: Guidance for special characteristic of optical fibre -- Part 2: Interpretation of OTDR backscattering traces
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| GB/T 33779.2-2017 | English | 279 |
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Guidance for special characteristic of optical fibre -- Part 2: Interpretation of OTDR backscattering traces
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GB/T 33779.2-2017
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Basic data | Standard ID | GB/T 33779.2-2017 (GB/T33779.2-2017) | | Description (Translated English) | Guidance for special characteristic of optical fibre -- Part 2: Interpretation of OTDR backscattering traces | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | M33 | | Classification of International Standard | 33.180.10 | | Word Count Estimation | 14,170 | | Date of Issue | 2017-05-31 | | Date of Implementation | 2017-12-01 | | Quoted Standard | GB/T 15972.40-2008; IEC 61746-1; IEC 61746-2 | | Adopted Standard | IEC/TR 62316-2007, MOD | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the analytical guidance for the backscattering curve of the OTDR. This standard applies to the analysis of fiber attenuation curves for independent and embedded OTDR measurements within the equipment. | GB/T 33779.2-2017: Guidance for special characteristic of optical fibre -- Part 2: Interpretation of OTDR backscattering traces
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Guidance for special characteristic of optical fiber - Part 2. Interpretation of OTDR backscattering traces
ICS 33.180.10
M33
National Standards of People's Republic of China
Guidelines for the testing of optical fiber properties
Part 2. OTDR backscatter curve analysis
Part 2. InterpretationofOTDRbackscatteringtraces
(IEC /T R62316..2007, GuidancefortheinterpretationofOTDR
backscatteringtraces, MOD)
2017-05-31 released
2017-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Directory
Preface I
1 Scope 1
2 normative reference document 1
Backscattering phenomenon
3.1 Rayleigh Scattering 1
3.2 Fresnel Reflex and Blind Zone 1
Measurement of OTDR 1
4.1 General 1
4.2 Representation of backward scattering power
4.3 Noise and disturbance 2
Analysis of backscatter curve
5.1 Unidirectional Curve 3
5.2 Bidirectional curve 4
6 Uncertainty, Deviation and Resolution 6
6.1 Overview 6
6.2 Measurement of attenuation coefficient 7
6.3 Fault location 7
Appendix A (Informative Annex) Structural changes in this part compared to IEC /T R62316..2007 9
Appendix B (informative) Technical differences between this section and IEC /T R62316..2007 and its causes 10
Reference 11
Foreword
GB/T 33779 "Fiber Optic Properties Test Guide" is expected to be divided into the following sections.
- Part 1. attenuation uniformity;
Part 2. OTDR backscatter curve analysis;
Part 3. Effective area (Aeff).
This part is part 2 of GB/T 33779.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This section uses the re-drafting method to modify IEC /T R62316..2007 "OTDR Backward Scattering Rules for Analytical Guidelines".
This section is structurally adjusted in comparison with IEC /T R62316..2007, which is listed in Appendix A and IEC /T R62316.
2007 chapter number comparison list.
This section has technical differences compared to IEC /T R62316..2007, and the terms involved in these differences have passed through the margin
The vertical single line (|) of the white position is marked, and a list of the corresponding technical differences and their causes is given in Appendix B.
Please note that some of the contents of this document may involve patents. The issuer of this document does not assume responsibility for the identification of these patents.
This part is part of the Ministry of Industry and Information Technology (communications) of the People's Republic of China.
This part of the drafting unit. Wuhan Fiberhome Technology Group Co., Ltd., Changfei Fiber Optic Cable Co., Ltd., Shenzhen Special Information Co., Ltd. Limited
Company, Hubei Kai Le Technology Co., Ltd., Jiangsu Southern Communications Technology Co., Ltd.
The main drafters of this part. Shi Huiping, Chen Hao, Li Jing, Zhang Weimin, Zhang Yongjun, Huang Zhengao.
Guidelines for the testing of optical fiber properties
Part 2. OTDR backscatter curve analysis
1 Scope
This part of GB/T 33779 specifies the analytical guidelines for the backscattering curve of the OTDR.
This section applies to the analysis of fiber attenuation curves for independent and embedded OTDR measurements within the device.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
GB/T 15972.40-2008 Specifications for optical fiber test methods - Part 40. Measurement methods and tests for transmission characteristics and optical properties
Program --- attenuation (IEC 60793-1-40..2001, MOD)
IEC 61746 (all parts) Calibration of optical time domain reflectometer (OTDR) [Calibrationofopticaltime-domainreflec-
tometers (OTDR)]
3 backscattering phenomenon
3.1 Rayleigh scattering
Diffusion of optical fiber material density will make the refractive index is not uniform will produce Rayleigh backscatter. As the fiber is composed of silicon dioxide
The fluctuation of its density is usually generated in the production process.
3.2 Fresnel reflex and blind spot
When a beam of light is incident at an angle to the interface between two different refractive index media, a portion of the light is refracted into the second
Inside, some part is reflected back to the first medium, which is the Fresnel reflex. Fresnel reflections sometimes reach very high values. Feene
The reflex is related to the refractive index difference between the two media, and also relates to the interface itself, such as the interface roughness, incident angle and interface defects. Have
Can detect a very strong Fresnel reflex, and even make the receiver to saturation, that is, the performance of the time signal on the flat response.
When the backscattered signal of a fiber is lower than the saturated reflected signal, the backscattered signal of this fiber can not be detected or
In the OTDR curve can not be reflected, this part of the OTDR test curve is defined as a blind spot. Usually tested at the OTDR output
And the measured fiber can be connected between a short section of the transition fiber to reduce the impact of blind spots.
4 OTDR measurements
4.1 General rules
The intensity of the backscatter of an optical fiber can be measured by the OTDR, the principle is from the test end to the end of the fiber to send light pulses,
The OTDR measures the optical power from the fiber back to the beginning. In the OTDR curve, the distance and time in line with the relationship (1).
t =
ng (λ)
(1)
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