Experimental observation of spectral transmittance of highly birefringent fibre with high spin rate

Spectral transmittance of spun hi-bi (highly birefringent) fibres with different spin rates is studied by an experimental method. It is found that, as the spin rate is raised to a certain high value, the transmittance of this kind of fibre drops down in a certain long wavelength band. This phenomenon of the spun type fibres is attributed essentially to microbending produced in the spinning-drawing processes.