An apodized in-fibre Bragg grating reflector is fabricated using the phase mask photoimprinting technique. The reflector has a centre wavelength of 1550 nm, a bandwidth of 0.22 nm and a peak reflectivity of 90%. At 0.4 nm (50 GHz) from the centre wavelength the reflectivity is 40 dB lower than the peak reflectivity; this is an improvement of more than 20 dB over an unapodized Bragg grating reflector with similar bandwidth and peak reflectivity.

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Journal Electronics Letters
Malo, B. (B.), Theriault, S. (S.), Johnson, D.C. (D. C.), Bilodeau, F. (F.), Albert, J, & Hill, K.O. (K. O.). (1995). Apodised in-fibre Bragg grating reflectors photoimprinted using a phase mask. Electronics Letters, 31(3), 223–225. doi:10.1049/el:19950150