Nonreciprocal effects in a ring interferometer with a multimode fiber waveguide

Investigation of mode coupling effects on sensitivity and bias of a multimode fiber loop interferometer: Application to an optimal design of a multimode fiber gyroscope

“…Theoretically, the MFOG has a stable output because of the averaging process of the random phase error over a large number of modes [18]. Indeed, MFOG when excited with incoherent light operates as several independent mini-gyroscopes and each mode can be considered as an independent Sagnac fiber loop interferometer.…”