OPTICAL FIBRE FOR THE FILTERED COLLECTION OF LIGHT, IN PARTICULAR RAMAN SCATTERED LIGHT AND METHOD FOR THE PRODUCTION THEREOF

摘要

The invention relates to an optical fibre for the filtered collection of light, in particular Raman scattered light produced by monochromatically excited light sources, and a method for the production thereof. The problem of providing such a fibre that overcomes the disadvantages of the prior art and that has as small an outer diameter (< 1 mm) of the fibre as possible over path lengths > 1 m and preferably bending radii of less than 5 mm is solved by providing, for each cross-sectional surface of 7853 mum2, at least 19 individual single mode fibre cores with a refractive index (n1) and with a core diameter d, which are embedded in a homogenous medium of the same refractive index (n2), the reciprocal core pitch (Pitch Lambda) of said fibres relative to one another is on the order of Lambda = 2 s d and is defined according to the relation (F) corresponding to the predetermined excitation wavelength (lambda), and by inscribing a fibre bragg grating (FBG) into all single mode fibres after extraction jointly and laterally in an identical position in each single mode fibre core.