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• bandwidth: capacity of waveguide (higher capacity required for multimode);
• attenuation: signal strength decrease over distance;
• cut-off wavelength: above which only a single mode propagates;
• numerical aperture: light acceptance angle of an optical fiber is measured;
• mode field diameter: the radial width of the light pulse in the fiber in single-mode fiber; required for interconnecting;
• Wiki Markupchromatic dispersion: rays of different wavelengths have different velocity through the core and spread short pulses of light; for single-mode fiber it limits information bandwidth.

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           Fig. 9. Optical fibers *\[6\]*

In addition, _mechanical and environmental testing_ is also done for the fiber to comply optical and mechanical integrity of product and customer requirements *\[1\]*:

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