modal noise

modal noise

[¦mōd·əl ′nȯiz]
(communications)
Interference of a multimode optical communications fiber with a laser light source when a speckle pattern in the light intensity in the fiber alters because of motion of the fiber or changes in the laser spectrum. Also known as modal distortion.
Mentioned in ?
References in periodicals archive ?
Coherent sources emit light in phase, and interaction of various modes in multi-mode fiber can create modal noise, causing bit error rate problems.
Worst-case loss margin, with all the power penalties caused by dispersion and modal noise and other noise contributions, can be as low as about 3-4 dB, depending on the fiber performance and length.
Moving beyond simple attenuation and insertion loss considerations, this revolutionary tool demonstrates the advantages of utilizing state-of-the-art; low differential mode delay (DMD) optical fiber coupled with reduced modal noise connections.