[2] Shupe D M. Thermally induced non reciprocity in the fiber optic interferometer. Appl. Opt., 1980, 19(5):654~655
[3] Hervè Lefèvre. The Fiber-Optic Gyroscope. Boston*London: Artech House, 1993. 93~96
[8] Miroslav Chomát. Efficient suppression of thermally induced nonreciprocity in fiber-optical Sagnac interferometers with novel double-layer winding. Appl. Opt., 1993, 32(13):2289~2291