Superseded

GB/T 9771.1-2008Single-mode optical fibres for telecommunication -- Part 1: Characteristics of a dispersion unshifted single-mode optical fibre (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

October 7, 2008

Implementation date

April 1, 2009

Scope

GB/T 9771.1-2008 (Single-mode optical fibres for telecommunication -- Part 1: Characteristics of a dispersion unshifted single-mode optical fibre) is available as an English-translated PDF.

GB/T 9771.1-2008 - 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.

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Document preview — GB/T 9771.1-2008

National Standard of the People's Republic of China

ICS: 33.180.10
Classification: M 33

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

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. lambdacc <= 1,260 nm;

b) Cut-off wavelength of optical fiber. lambdac not stipulated;

c) Cut-off wavelength of jumper cable. lambdacj <= 1,250 nm (in terms of jumper cable

whose length is 2 m ~ 20 m).

NOTE 1.the relations among the measured value of lambdac, lambdacc and lambdacj are related with the

structure and measurement conditions of optical fiber and optical cable.

Under general circumstances, lambdacc < lambdacj < lambdac.

NOTE 2.in terms of the cut-off wavelength of optical fiber used in special application

occasion, it is stipulated that lambdac 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 lambdac of optical fiber should be not more

than 1,250 nm.

NOTE 3.in terms of certain specific submarine optical cable, other values of lambdacc 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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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 9771 · GB/T 15972 · IEC 60793 · GB/T 18900-2002 · IEC/TR 61282 · IEC 62048.2001

Cited by

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