Farries, M.C., Townsend, J.E. and Poole, S.B.
Very high-rejection optical fibre filters
Electronics Letters, 22, (21), . (doi:10.1049/el:19860772).
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An optical filter has been developed using holmium-doped optical fibre. Transmission in the blocking band is 10^-7 % while transmission in the passband is 85%. The wavelength separation between maximum blocking and maximum pass is only 40 nm.
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