V. Annovazzilodi et al., ALL-FIBER FARADAY ROTATOR MADE BY A MULTITURN FIGURE-OF-8 COIL WITH MATCHED BIREFRINGENCE, Journal of lightwave technology, 13(12), 1995, pp. 2349-2353
With a figure-of-eight winding of monomode fiber, we have been able to
build multiturn (>100) coils which can be easily trimmed to match the
condition of exactly one wavelength-per-turn birefringence. As an exa
mple, we report a 45 degrees Faraday rotator intended for an all-fiber
optical isolator at lambda = 1300 nm.