A new type of all-single-mode fiber depolarizer, based upon a 2 × 2 coupler and a recirculating delay line and useable with a coherent light source, is proposed and demonstrated. The reduction in the degree of polarization is examined theoretically and experimentally. Design criteria and principles are discussed. With a narrow-band laser source, the degree of polarization was tuned between 99.8% and 1.15%. Experiments illustrate how this depolarizer can eliminate the effects of induced polarization fluctuation in a polarization-sensitive fiber-optic system. The experimental results support the theoretical model.
© 1998 Optical Society of America
Paisheng Shen, Joseph C. Palais, and Chinlon Lin, "Fiber Recirculating Delay-Line Tunable Depolarizer," Appl. Opt. 37, 443-448 (1998)