Comments on ´Dispersion sensitivity of infra-red dispersion-shifted fibres´

Disagrees with the comments in the recent letter by Ohashi et al. (see ibid., vol.25, no.7, p.4 1989) that dispersion sensitivity has not been previously reported on for various alpha -index profiles in single-mode infrared heavy metal fluoride optical fibres. The authors have considered exactly the same parameter, dispersion sensitivity.