Birefringence optical fibers (OF) appeared in [1978][1979][1980][1981][1982][1983] together with the technologies of thermoelastic inserts in the workpieces for drawing optical fibers. This article deals with two basic methods of measurement of embedded BOFs: spectral method and elastic twisting method. Three OFs types, drawn from the workpieces with embedded linear birefringence are taken as objects of study: HiBi or also PM-(polarization maintaining) fibers; fibers, drawn from the same workpieces, but with the rotation of the workpiece -spun-fiber; LoBi-fibers, which by the method are referred to as spun-fibers. The technique of measuring the beat length of the embedded BOFs is described in detail.
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Morshne et al. (2018) studied this question.
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