This International Standard describes the launch condition requirements used for measuring multimode attenuation in passive components and in installed cable plants.<\/p>\n
In this standard, the fibre types that are addressed include category A1a (50 \u03bcm \/125 \u03bcm) and A1b (62,5 \u03bcm \/125 \u03bcm) multimode fibres, as specified in IEC 60793-2-10. The nominal test wavelengths detailed are 850 nm and 1 300 nm. This standard may be suitable for multimode attenuation measurements for other multimode categories and\/or other wavelengths, but the source condition for other categories and wavelengths are not defined here.<\/p>\n
The purpose of these requirements is as follows:<\/p>\n
to ensure consistency of field measurements when different types of test equipment are used;<\/p>\n<\/li>\n
to ensure consistency of factory measurements when different types of test equipment are used;<\/p>\n<\/li>\n
to ensure consistency of field measurements when compared with factory measurements.<\/p>\n<\/li>\n<\/ul>\n
This standard describes launch condition requirements for optical attenuation using sources with a controlled encircled flux (EF).<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 4 Background on multimode launch conditions <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 5 Test source launch 5.1 General 5.2 Encircled flux 5.3 Encircled flux template illustration <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.4 Encircled flux target for attenuation measurement Figure 1 \u2013 EF template illustration Table 1 \u2013 EF target for 50 (m core fibre at 850 nm Table 2 \u2013 EF target for 50 (m core fibre at 1\u00a0300 nm <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 5.5 Harmonization of multimode launch conditions to eliminate wavelength bias Figure 2 \u2013 Wavelength comparison Table 3 \u2013 EF target for 62,5 (m fibre at 850 nm Table 4 \u2013 EF target for 62,5 (m fibre at 1\u00a0300 nm <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 5.6 Limitations on multimode launch conditions 5.7 Encircled flux limits 5.8 Practical limitations of multimode launch conditions Table 5 \u2013 Tolerance threshold <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Fibre optics. Launch condition requirements for measuring multimode attenuation<\/b><\/p>\n |