消偏光纤陀螺的偏振态研究
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摘要
本文对消偏光纤陀螺中的偏振特性进行了分析，包括单模光纤环和消偏器中的偏振态演变、保偏光纤的消偏性能、单模光纤环的双折射和耦合、输出光强和非互易性相位误差与偏振态的关系。
首先，本文分析了Lyot消偏器对完全偏振光与非完全偏振光的消偏作用，由此得出了关于Lyot消偏器的长度和结合角、光源光谱以及与消偏器配合的起偏器消光比的一些结论。结合偏振模分析仪的测量原理以及Lyot消偏器的性能和单模光纤环的偏振状况，提出了一种利用偏振模分析仪设计消偏光纤陀螺中消偏器长度的方法。
接着本文根据偏振模色散的理论，对消偏光纤陀螺中，单模光纤敏感环的双折射和耦合与外界环境变化之间的关系进行了分析，从中得出了一些有益的结论。
结合以上对消偏器与单模光纤环的分析，本文从整体上分析了消偏光纤陀螺中的偏振态，并对非互易性相位误差与消偏器和单模光纤环的关系进行了深入的讨论。最后，分析了偏振误差与解调之间的关系。
In this paper,the polarization in the fiber-optic depolarized gyros has been analyzed. Several aspects are under discussion,such as the polarization evolution in the depolarizer and the single-mode fiber sensing coil,the depolarization in the polarization-maintain fiber,the birefringence and coupling in the single-mode fiber,the nonreciprocal phase error and the output intensity.
Firstly,the depolarization effect of the Lyot depolarizer to the polarized light and the partially polarized light has been analyzed. Some conclusions about the length and the splice angle of the depolarizer,the spectrum of the light source and the extinction ratio of the polarizer are obtained. Associated with the polarization in the sensing coil and the principle of the PMD analyzer,one method to design the length of the Lyot depolarizer has been put forward.
Based on the theory of the PMD,the influence of the environment on the coupling and birefringence in the single-mode sensing coil is analyzed,and some conclusions about it have been drawn.
Based on the above analysis,the polarization in the whole fiber-optic depolarized gyros has been studied. The relationship of the nonreciprocal phase error to the depolarizer and the single-mode sensing coil is the emphasis of this part. It also involves the relation between the demodulation and the polarization error.
首先，本文分析了Lyot消偏器对完全偏振光与非完全偏振光的消偏作用，由此得出了关于Lyot消偏器的长度和结合角、光源光谱以及与消偏器配合的起偏器消光比的一些结论。结合偏振模分析仪的测量原理以及Lyot消偏器的性能和单模光纤环的偏振状况，提出了一种利用偏振模分析仪设计消偏光纤陀螺中消偏器长度的方法。
接着本文根据偏振模色散的理论，对消偏光纤陀螺中，单模光纤敏感环的双折射和耦合与外界环境变化之间的关系进行了分析，从中得出了一些有益的结论。
结合以上对消偏器与单模光纤环的分析，本文从整体上分析了消偏光纤陀螺中的偏振态，并对非互易性相位误差与消偏器和单模光纤环的关系进行了深入的讨论。最后，分析了偏振误差与解调之间的关系。
In this paper,the polarization in the fiber-optic depolarized gyros has been analyzed. Several aspects are under discussion,such as the polarization evolution in the depolarizer and the single-mode fiber sensing coil,the depolarization in the polarization-maintain fiber,the birefringence and coupling in the single-mode fiber,the nonreciprocal phase error and the output intensity.
Firstly,the depolarization effect of the Lyot depolarizer to the polarized light and the partially polarized light has been analyzed. Some conclusions about the length and the splice angle of the depolarizer,the spectrum of the light source and the extinction ratio of the polarizer are obtained. Associated with the polarization in the sensing coil and the principle of the PMD analyzer,one method to design the length of the Lyot depolarizer has been put forward.
Based on the theory of the PMD,the influence of the environment on the coupling and birefringence in the single-mode sensing coil is analyzed,and some conclusions about it have been drawn.
Based on the above analysis,the polarization in the whole fiber-optic depolarized gyros has been studied. The relationship of the nonreciprocal phase error to the depolarizer and the single-mode sensing coil is the emphasis of this part. It also involves the relation between the demodulation and the polarization error.
引文
[1] H.Lefevre, "The Fiber-Optic Gyroscope" Boston, MA: Artech House, 1993
[2] R.-Y. Liu, T. F. El-Wailly, 和 R. C. Dankwort, "Results of Honeywell first-generation, high performance interferometric fiber optic gyroscope," SPIE Proc., vol. 1585, pp. 262-275, 1991.
[3] A. Cordova, R. Patterson, J. Rahu, L. Lam 和 D. Rozelle, "Progress in navigation grade FOG performance," SPIE Proc., vol. 2837, pp.207-217, 1996.
[4] B. Szafraniec, J. Feth, R. Bergh, 和 J. Blake, "Performance improvements in depolarized fiber gyros,"SPIE Proc. Fiber Optic and Laser Sensors XIII, vol. 2510, pp. 37-48, 1995.
[5] G. A. Sanders, B. Szafraniec, L. Strandjord, R. Bergh, A. Kaliszek, R.Dankwort, C. Lange, 和 D. Kimmel, "Progress in high performance fiber optic gyroscopes," OSA Proc., vol. OFS-16; Fiber Optic Sensors,pp. 116-121, 1997.
[6] K. Bohm, P. Marten, K. Petermann, E. Weidel, 和 R. Ulrich, "Low-drift fiber gyro using a superluminescent diode," Electron. Lett., vol. 17, no. 10, pp. 352-353, 1981.
[7] J. Blake, B. Szafraniec, 和 J. Feth, "Partially polarized fiber optic gyro,"Opt. Lett., vol. 21, no. 15, pp. 1192-1194, 1996.
[8] G. A. Sanders, B. Szafraniec, R.-Y. Liu, C. Laskoskie, L. Strandjord, 和 G. Weed, "Fiber optic gyros for space, marine and aviation applications,"SPIE Proc., vol. 2837; Fiber Optic Gyros: 20th Anniversary Conf., 1996,pp. 61-71; 1996, pp. 18-23.
[9] J. Blake 和 B. Szafraniec, "Random noise in PM and depolarized fiber Gyros," OSA Proc., vol. OFS-16; Fiber Optic Sensors, pp. 122-125,1997.
[10] S.L.A.Carrara, B.Y. Kim 和 H.J.Shaw, "Bias drift reduction in polarization-maintaining fiber gyroscope," Opt. Lett., vol. 12, no. 3, pp. 214-216, 1987.
[2] R.-Y. Liu, T. F. El-Wailly, 和 R. C. Dankwort, "Results of Honeywell first-generation, high performance interferometric fiber optic gyroscope," SPIE Proc., vol. 1585, pp. 262-275, 1991.
[3] A. Cordova, R. Patterson, J. Rahu, L. Lam 和 D. Rozelle, "Progress in navigation grade FOG performance," SPIE Proc., vol. 2837, pp.207-217, 1996.
[4] B. Szafraniec, J. Feth, R. Bergh, 和 J. Blake, "Performance improvements in depolarized fiber gyros,"SPIE Proc. Fiber Optic and Laser Sensors XIII, vol. 2510, pp. 37-48, 1995.
[5] G. A. Sanders, B. Szafraniec, L. Strandjord, R. Bergh, A. Kaliszek, R.Dankwort, C. Lange, 和 D. Kimmel, "Progress in high performance fiber optic gyroscopes," OSA Proc., vol. OFS-16; Fiber Optic Sensors,pp. 116-121, 1997.
[6] K. Bohm, P. Marten, K. Petermann, E. Weidel, 和 R. Ulrich, "Low-drift fiber gyro using a superluminescent diode," Electron. Lett., vol. 17, no. 10, pp. 352-353, 1981.
[7] J. Blake, B. Szafraniec, 和 J. Feth, "Partially polarized fiber optic gyro,"Opt. Lett., vol. 21, no. 15, pp. 1192-1194, 1996.
[8] G. A. Sanders, B. Szafraniec, R.-Y. Liu, C. Laskoskie, L. Strandjord, 和 G. Weed, "Fiber optic gyros for space, marine and aviation applications,"SPIE Proc., vol. 2837; Fiber Optic Gyros: 20th Anniversary Conf., 1996,pp. 61-71; 1996, pp. 18-23.
[9] J. Blake 和 B. Szafraniec, "Random noise in PM and depolarized fiber Gyros," OSA Proc., vol. OFS-16; Fiber Optic Sensors, pp. 122-125,1997.
[10] S.L.A.Carrara, B.Y. Kim 和 H.J.Shaw, "Bias drift reduction in polarization-maintaining fiber gyroscope," Opt. Lett., vol. 12, no. 3, pp. 214-216, 1987.