Optical fiber gratings with azimuthal refractive index perturbation, method of fabrication, and devices for tuning, attenuating, switching, and modulating optical signals

摘要: Article entitled" Long period gratings formed in depressed cladding fibres', by Dong, et al., dated Oct. 23, 1997, Electronics Letters, vol. 33, No. 22, pp. 1897-1898. Article entitled" Independent tuning of cascaded long period fibre gratings for spectral shaping” by Xu, et al. dated Oct. 23, 1997, Electronics Letters vol. 33, No. 22, pp.