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GB/T 9771.1-2008 English PDF (GBT9771.1-2008)

GB/T 9771.1-2008 English PDF (GBT9771.1-2008)

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GB/T 9771.1-2008: Single-mode optical fibres for telecommunication -- Part 1: Characteristics of a dispersion unshifted single-mode optical fibre
This Part of GB/T 9771 specifies the geometric characteristics, optical characteristics, transmission characteristics, and mechanical property and environment performance requirements of Class-B1.1 dispersion unshifted single-mode optical fiber; the measurement method for the characteristics of optical fiber. The zero-dispersion wavelength of this class of optical fiber is around 1,310 nm. It can be adopted in 1,310 nm wavelength region and 1,550 nm wavelength region.
GB/T 9771.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.180.10
M 33
Replacing GB/T 9771.1-2000
Single-mode Optical Fibers for Telecommunication -
Part 1. Characteristics of a Dispersion Unshifted
Single-mode Optical Fiber
ISSUED ON. OCTOBER 7, 2008
IMPLEMENTED ON. APRIL 1, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Abbreviations ... 7
5 Requirements... 7
Foreword
GB/T 9771 Single-mode Optical Fibers for Telecommunication is divided into the following parts.
---Part 1. Characteristics of a Dispersion Unshifted Single-mode Optical Fiber; ---Part 2. Characteristics of a Cut-off Wavelength Shifted Single-mode Optical Fiber;
---Part 3. Characteristics of an Extended Wavelength Band Dispersion Unshifted Single-mode Optical Fiber;
---Part 4. Characteristics of a Dispersion-shifted Single-mode Optical Fiber; ---Part 5. Characteristics of a Non-zero Dispersion Shifted Single-mode Optical Fiber;
---Part 6. Characteristics of a Fiber with Non-zero Dispersion for Wideband Optical Transport;
---Part 7. Characteristics of a Bending Loss Insensitive Single-mode Optical Fiber for the Access Network.
This Part is the first part of GB/T 9771. The geometric characteristics, optical characteristics and transmission characteristics of optical fiber take the technical indicators of G.652. Class-A and G.652. Class-B optical fiber in ITU-T G.652. 2005 Characteristics of a Single-mode Optical Fiber and Cable (English version) as a reference. The mechanical property and environmental performance of optical fiber take the stipulation of Class-B1.1 optical fiber in IEC 60793-2-50. 2007 (Version 3.0, 86A/1164/CDV draft) Optical Fibers - Part 2-50. Product Specifications - Sectional Specification for Class B Single-mode Fibers (English version) as a reference. This Part serves as a replacement of GB/T 9771.1-2000 The Series of Single-mode Optical Fibers for Telecommunication - Part 1. Characteristics of a Dispersion Unshifted Single-mode Optical Fiber. In the revision, other advanced foreign standards are also taken as a reference; the specific domestic situation is also combined in the revision.
In comparison with GB/T 9771.1-2000, there are several main changes as follows. ---The title of the standard is modified from “The Series of Single-mode Optical Fibers for Telecommunication - Part 1. Characteristics of a Dispersion Unshifted Single-mode Optical Fiber” into “Single-mode Optical Fibers for
Telecommunication - Part 1. Characteristics of a Dispersion Unshifted Single- mode Optical Fiber”;
Single-mode Optical Fibers for Telecommunication -
Part 1. Characteristics of a Dispersion Unshifted
Single-mode Optical Fiber
1 Scope
This Part of GB/T 9771 specifies the geometric characteristics, optical characteristics, transmission characteristics, and mechanical property and environment performance requirements of Class-B1.1 dispersion unshifted single-mode optical fiber; the measurement method for the characteristics of optical fiber. The zero-dispersion wavelength of this class of optical fiber is around 1,310 nm. It can be adopted in 1,310 nm wavelength region and 1,550 nm wavelength region.
This Part is applicable to Class-B1.1 dispersion unshifted single-mode optical fiber used in telecommunication cable and other information transmission equipment. 2 Normative References
Through the reference in this Part of GB/T 9771, the clauses in the following documents become clauses of this Part. In terms of references with a specific date, all the subsequent modification lists (excluding the corrected content) or revised editions are not applicable to this Part. However, all parties that reach an agreement in accordance with this Part are encouraged to explore the possibility of adopting the latest version of these documents. In terms of references without a specific date, the latest version is applicable to this Part.
GB/T 15972 (all parts) Specifications for Optical Fiber Test Methods [IEC 60793-1 (all parts), Optical Fibers - Part 1. Measurement Methods and Test Procedures, MOD]
GB/T 18900-2002 Test Methods for Polarization Mode Dispersion of Single-mode Optical Fibers
ITU-T G.650.1.2004 Definitions and Test Methods for Linear, Deterministic Attributes of Single-mode Fiber and Cable
ITU-T G.650.2.2007 Definitions and Test Methods for Statistical and Non-linear Related Attributes of Single-mode Fiber and Cable
ITU-T G.652.2005 Characteristics of a Single-mode Optical Fiber and Cable IEC/TR 61282-3.2006 Fiber Optic Communication System Design Guides - Part 3. Calculation of Link Polarization Mode Dispersion
IEC 62048.2001 Optical Fibers - Reliability - Power Law Theory
3 Terms and Definitions
Relevant terms and definitions, which are determined in GB/T 15972, ITU-T G. 650.1. 2004 and ITU-T G. 650.2. 2007 are applicable to this Part.
4 Abbreviations
The following abbreviations are applicable to this Part.
DWDM. Dense Wavelength Division Multiplexing
FWM. Four-wave Mixing
PMD. Polarization Mode Dispersion
PMDQ. Link Polarization Mode Dispersion
WDM. Wavelength Division Multiplexing
5 Requirements
5.1 Dimension Parameters
5.1.1 Technical indicator of dimension parameters
Dimension parameter requirement of Class-B1.1 single-mode optical fiber shall comply with the stipulation in Table 1.
a) Cut-off wavelength of cable. cc ≤ 1,260 nm;
b) Cut-off wavelength of optical fiber. c not stipulated;
c) Cut-off wavelength of jumper cable. cj ≤ 1,250 nm (in terms of jumper cable whose length is 2 m ~ 20 m).
NOTE 1. the relations among the measured value of c, cc and cj are related with the structure and measurement conditions of optical fiber and optical cable. Under general circumstances, cc < cj < c.
NOTE 2. in terms of the cut-off wavelength of optical fiber used in special application occasion, it is stipulated that c shall be not more than 1,250 nm. Such special application occasion refers to the applicable of the shortest optical cable with the maximum bending radius. For example, in jumper cable whose length is less than 2 m, the cut-off wavelength c of optical fiber should be not more than 1,250 nm.
NOTE 3. in terms of certain specific submarine optical cable, other values of cc may be requested.
5.2.2 Macro-bending loss
Under the radius of 30 mm, wind optical fiber for 100 loops in loose winding. The macro-bending loss of Class-A optical fiber (in Table 4) measured in 1,550 nm shall not exceed 0.1 dB; micro-bending loss of Class-B optical fiber (in Table 4) measured in 1,625 nm shall not exceed 0.1 dB.
NOTE 1. if due to practical reasons, less than 100 loops are selected for 30 mm bending radius test, then, it is suggested that there shall be not less than 40 loops, the macro-bending loss shall be decreased progressively in proportion.
NOTE 2. in order to guarantee that bending loss can be easily measured and the accuracy of such measurement, a loop or several loops of small-radius loop fiber may be used to replace 100 loops of fiber for the test. Under this circumstance, the number of loops, the radius of loops and the maximum allowable bending loss shall be corresponding with the loss in the test of 100 loops of 30 mm radius. 5.2.3 Attenuation coefficient and dispersion characteristics
The requirement of attenuation coefficient and dispersion characteristics of Class-B1.1 single-mode optical fiber shall comply with the stipulation in Table 3. may be approximately calculated through a linear function formula which varies with wavelength.
5.2.4 Attenuation point discontinuity
At the wavelength of 1,310 nm and 1,550 nm, in the continuous length of optical fiber, there shall not be discontinuous point that exceeds 0.1 dB.
5.2.5 Attenuation wavelength characteristics
The attenuation coefficient value within the wavelength range of 1,285 nm ~ 1,330 nm, with respect to the attenuation coefficient value of 1,310 nm wavelength, shall not exceed 0.04 dB/km.
The attenuation coefficient value within the wavelength range of 1,525 nm ~ 1,575 nm, with respect to the attenuation coefficient value of 1,550 nm wavelength, shall not exceed 0.03 dB/km.
5.2.6 Dispersion longitudinal uniformity
To be studied.
NOTE. at a specific wavelength, the absolute value of dispersion coefficient in partial optical section might deviate from the numerical value measured in a long optical section. If this numerical value decreases to an extremely small value in an operating wavelength approximate to the Wavelength Division Multiplexing (WDM) system, Four-wave Mixing (FWM) effect can trigger power transmission at other wavelengths or other operating wavelengths. The size of FWM power is the function of dispersion absolute value, dispersion slope, operating wavelength, optical power and the distance of FWM generation. In terms of the application of Dense Wavelength Division Multiplexing (DWDM) at the wavelength of 1,550 nm, the dispersion value of this class of optical fiber is sufficiently large to avoid FWM effect; dispersion longitudinal uniformity is not prominent.
5.2.7 Polarization mode dispersion coefficient
This Part merely stipulates link PMD coefficient; the maximum PMDQ shall comply with the stipulation in Table 4.
Table 4 -- Maximum Value of Link PMD Coefficient
Items Unit Technical Indicators Class-A Class-B
PMD
Coefficient
M section 20
Q (probability) % 0.01
Un-cabled fiber link
maximum PMDQ 0.5 0.20
NOTE 1. ITU-T G. 652. 2005 stipulates the requirement of cabled fiber link PMD. M (number
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