Chiral fiber optical isolator

Victor I. Kopp; Guoyin Zhang; Sheng Zhang; Azriel Z. Genack; Dan Neugroschl

doi:10.1117/12.808311

19 February 2009 Chiral fiber optical isolator

Victor I. Kopp, Guoyin Zhang, Sheng Zhang, Azriel Z. Genack, Dan Neugroschl

Proceedings Volume 7195, Fiber Lasers VI: Technology, Systems, and Applications; 71950B (2009) https://doi.org/10.1117/12.808311
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

Abstract

We propose an in-fiber chiral optical isolator based on chiral fiber polarizer technology and calculate its performance by incorporating the magnetic field into the scattering matrix. The design will be implemented in a special preform, which is passed through a miniature heat zone as it is drawn and twisted. The birefringence of the fiber is controlled by adjusted the diameter of a dual-core optical fiber. By adjusting the twist, the fiber can convert linear to circular polarization and reject one component of circular polarization. In the novel central portion of the isolator, the fiber diameter is large. The effective birefringence of the circular central core with high Verdet constant embedded in an outer core of slightly smaller index of refraction is small. The central potion is a non-reciprocal polarization converter which passes forward traveling left circularly polarized (LCP) light as LCP, while converting backward propagating LCP to right circularly polarized (RCP) light. Both polarizations of light traveling backwards are scattered out of the isolator. Since it is an all-glass structure, we anticipate that the isolator will be able to handle several watts of power and will be environmentally robust.

Citation Download Citation

Victor I. Kopp, Guoyin Zhang, Sheng Zhang, Azriel Z. Genack, and Dan Neugroschl "Chiral fiber optical isolator", Proc. SPIE 7195, Fiber Lasers VI: Technology, Systems, and Applications, 71950B (19 February 2009); https://doi.org/10.1117/12.808311

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