Theoretic analysis of mode-couple equation in all-fiber polarization transformer

Zhi-Dong Shi; Min-Ning Ji; Jian-Qiang Lin; Shu Liu

doi:10.1117/12.743748

21 November 2007 Theoretic analysis of mode-couple equation in all-fiber polarization transformer

Zhi-Dong Shi, Min-Ning Ji, Jian-Qiang Lin, Shu Liu

Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67814J (2007) https://doi.org/10.1117/12.743748
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

The variably coupled-mode equation in all-fiber polarization transformer (AFPT) is theoretically analyzed and an optimal profile of variably spun rate to get better performance for AFPT samples is proposed as Q(z) = 0.5tan{arcsin[(z/L)sin(arctan2Q(L))]} where Q(z) is the normalized spun rate by beat length L_B along the spinning section of AFPT with total length L. Then, in accordance with this specific intrinsic structure of AFPT, we found that there exists a set of strictly analytic solution for the variably coupled-mode equations of AFPT. It is also found that the linear polarized exact eigen-modes of AFPT at the un-spun end are not parallel but with a slight angle relative to the birefringence axes of the un-spun fiber. The difference of phase factor and amplitude between the exact analytic solution and the asymptotic solution is compared and discussed. The analysis has referential values to the design, fabrication and evaluation of AFPT samples.

Citation Download Citation

Zhi-Dong Shi, Min-Ning Ji, Jian-Qiang Lin, and Shu Liu "Theoretic analysis of mode-couple equation in all-fiber polarization transformer", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67814J (21 November 2007); https://doi.org/10.1117/12.743748

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