Polarizing Beam Splitter Of Polished Type.

M. N. Zervas; S. Markatos; I. P. Giles

doi:10.1117/12.959738

23 February 1989 Polarizing Beam Splitter Of Polished Type.

M. N. Zervas, S. Markatos, I. P. Giles

Proceedings Volume 0988, Components for Fiber Optic Applications III and Coherent Lightwave Communications; (1989) https://doi.org/10.1117/12.959738
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

Abstract

Fibre-optic polarizing beam splitters are 2x2 port components which cross-couple efficiently one input linear polarization and transmit unaffected the orthogonal one. Such a device is useful in a variety of all-fibre-optic applications such as wavelength multiplexing / demultiplexing, polarization diversity detection schemes, and fibre Raman amplifiers. The configurations reported so far consist of two single-modal low- or high-birefrigence fibres coupled together by either fusion or polishing techniques. Their function relies upon the geometrical form and/or stress-induced birefrigence introduced into the interaction area. The polarization splitting can then be described either by the use of different-coupling- coefficient arguments for the two orthogonal polarizations [1] [2], or by differential beating of the LP0 1 and LP 11 modes excited in the interaction composite region by each of the two orthogonal polarizations [3] [4]. An alternative novel approach to the same problem utilizes the polishing technique to couple the two fibres and Surface Plasmon Waves (SPWs) to achieve polarization separation [5]. A thin metal film incorporated between the two polished surfaces in the interaction area supports SPWs which are inherently TM-polarised. Therefore, in this three-waveguide structure (fibre-thin metal film-fibre) only TM-like-polarized light cross-couples efficiently while the TE-like-polarization is transmitted unaffected. A typical polarization extinction ratio of 35 dB in both arms and a polarization selectivity of 30 dB are achieved.

Citation Download Citation

M. N. Zervas, S. Markatos, and I. P. Giles "Polarizing Beam Splitter Of Polished Type.", Proc. SPIE 0988, Components for Fiber Optic Applications III and Coherent Lightwave Communications, (23 February 1989); https://doi.org/10.1117/12.959738

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