By J. Laferriere, G. Lietaert, R. Taws, S. Wolszczak
IN ENGLISH, good illustrated, 137 pages
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Additional info for Reference Guide to Fiber Optic Testing Volume 1
Example text
Tests are usually performed in both directions since results can differ slightly from one direction to the other. For example, attenuation through couplers and fiber core mismatches can significantly differ in either direction. To ensure a better level of accuracy, averages are calculated when qualifying a link. With traditional light sources and power meters, the instruments must either be transferred from one end of the link to the other or a light source and a power meter are required at both ends of the link.
These platforms can usually perform complete fiber characterization including the following tests: – Loss testing – Optical return loss (ORL) – Optical time domain reflectometry (OTDR) – Polarization mode dispersion (PMD) – Chromatic dispersion (CD) – Attenuation profile (AP) or spectral attenuation (SA) JDSU fiber characterization test platform Fiber characterization platforms contain a controller, display, operator controls, and optional equipment, such as a talk set, printer, input/output interfaces, modem, and hard/floppy disk 58 drives with CD-ROM read/write capabilities.
These power margins cover allowances for the effects of time and environmental factors (launched power, receiver sensitivity, connector, or splice degradation). In order to calculate the optical loss budget, typical values of attenuations of the different fiber components are used. 5 dB excess loss) Once the calculation of the overall optical loss budget is completed, the cable can be installed. 6 Optical Return Loss Meters There are several methods that can be used to measure optical return loss (ORL).