| 摘要 |
A fibre-optic gyroscope is provided herein which includes a polarizer, a fibre coil and couplers. A light beam is polarized, divided into two beams and introduced into the fibre coil. Two depolarizers are provided, one being provided between a light source and a polarizer, the other being provided between the fibre coil and a coupler. Four birefringent materials A, B, C and D should satisfy inequalities: ¦ PaBaLa + PbBbLb + PcBcLc + PdBdLd ¦ - BsLs > C where Pa, Pb, Pc, and Pd are triplet factors which may be one of -1, 0 or +1 independently, Ba, Bb, BC and Bd are birefringence La, Lb, Lc and Ld are lengths of A, B, C and D, and B?L5 is the extra birefringency of the fibre coil or couplers. By these means, the condition for avoiding interference between two depolarizers is clarified.
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