Polarizing Beam Splitter Of Polished Type.

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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.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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