Measurement of distributed mode coupling in high birefringence polarization-maintaining fiber with random polarization modes exited

Feng Tang; Wencai Jing; Yimo Zhang; Ge Zhou; Dagong Jia; Hongxia Zhang; Li Ren

doi:10.1117/12.667901

20 January 2006 Measurement of distributed mode coupling in high birefringence polarization-maintaining fiber with random polarization modes exited

Feng Tang, Wencai Jing, Yimo Zhang, Ge Zhou, Dagong Jia, Hongxia Zhang, Li Ren

Author Affiliations +

Proceedings Volume 6027, ICO20: Optical Information Processing; 60270N (2006) https://doi.org/10.1117/12.667901
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

A white light Michelson interferometer is designed to measure the distributed polarization mode coupling in High birefringence polarization-maintaining fibers (HiBi-PMFs). Using a Michelson interferometer to compensate the optical path difference induced by the modal birefringence of PMF, both power coupling intensity and position of the coupling point can be acquired. Traditionally, this technique requires only one polarization mode in the PMF to be exited or both polarization modes to be exited with equal intensity. This needs precise alignment of the polarization direction with the principal axis of the PMF. In practice, it's not easy to realize. In this paper, the influence of the incident polarization extinction ratio (PER) on the measurement result was evaluated theoretically and experimentally. A polarization state adjusting mechanism is designed. An analyzer can be oriented at any angle of the PMF's principle axes. By alternating this angle between 0^o, 90^o and 45^o, the incident PER can be calculated and the measurement can be carried out with random exited polarization mode. An instrument was designed and implemented to verify this scheme. Spatial resolution better than 7cm and coupling strength sensitivity less than -75dB are realized.

Citation Download Citation

Feng Tang, Wencai Jing, Yimo Zhang, Ge Zhou, Dagong Jia, Hongxia Zhang, and Li Ren "Measurement of distributed mode coupling in high birefringence polarization-maintaining fiber with random polarization modes exited", Proc. SPIE 6027, ICO20: Optical Information Processing, 60270N (20 January 2006); https://doi.org/10.1117/12.667901

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