1 Scope
2
Definitions
3
Fibre characteristics
3.1 Geometrical characteristics of the fibre
3.1.1 Core diameter
3.1.2 Cladding diameter
3.1.3 Concentricity error
3.1.4 Non-circularity
3.2 Optical properties of the fibre
3.2.1 Refractive index profile
3.2.2 Numerical aperture
3.3 Material properties of the fibre
3.3.1 Fibre
materials
3.3.2 Protective materials
3.3.3 Prooftest level
4
Factory length specifications
4.1 Attenuation coefficient
4.2 Baseband response
4.2.1
Modal distortion bandwidth: amplitude response
4.2.2 Modal distortion bandwidth: phase
response
4.2.3 Chromatic dispersion
5
Elementary cable sections
5.1 Attenuation
5.2 Baseband response (overall –3 dB optical bandwidth)
5.2.1 Modal distortion bandwidth
6
Test methods
6.1 Reference test method and alternative test method for
geometrical and optical parameters measurements
6.1.1 General
6.1.2 Intrinsic quality factor
6.1.3 Geometrical characteristics
6.2 The reference test methods for geometrical parameters and the
alternative test method for numerical aperture: the refracted near-field
technique
6.2.1 General
6.2.2 Maximum theoretical numerical aperture
and refractive index difference
6.2.3 Test apparatus
6.2.4 Preparation of fibre under test
6.2.5 Procedure
6.2.6 Presentation of results
6.3 Alternative test method for geometrical parameters: thenear-field technique
6.3.1 General
6.3.2
Test apparatus
6.3.3 Procedure
6.3.4 Presentation of the results
6.4 Reference test method for the numerical
aperture: far-field light distribution
6.4.1 Object
6.4.2
Specimen preparation
6.4.3 Apparatus
6.4.4 Procedure
6.4.5 Results
6.4.6 Presentation of results
6.5 Reference test method and alternative test methods for
attenuation measurements
6.5.1 Objectives
6.5.2 Definition
6.5.3 Description
6.5.4 Field of application
6.6 The reference test method: the cutback technique
6.6.1 Launching conditions
6.6.2 Apparatus and procedure
6.6.3 Presentation of results
6.7 First alternative test method: the insertion loss
technique
6.7.1
Launching conditions
6.7.2 Apparatus and procedure
6.7.3 Presentation of results
6.8 Second alternative test method: the backscattering
technique
6.8.1 Launching conditions
6.8.2 Apparatus and procedure
6.8.3 Presentation of results
6.9 Reference test method for baseband response measurements
6.9.1 Object
6.10 Reference test method
6.10.1 Test apparatus
6.10.2 Procedure
6.10.3 Presentation of results
Appendix I – Algorithm for geometrical parameters
I.1 Core centre and diameter
I.2 Cladding centre and diameter