Depressed cladding single-mode fibres for 1300 nm operation

The design of depressed cladding single-mode fibres for operation at 1300 mm is investigated. The depressed cladding profile is the simplest structure which satisfies the requirement of low bending loss without compromising the dispersion characteristics of the fibre. Fibres can be designed with a cutoff wavelength close to the operating wavelength of 1300 nm and with a zero of dispersion coinciding with the operating wavelength. The fibres can have a large spotsize which does not compromise the splice loss. A significant advantage is the insensitivity of the performances of these fibres to changes in the structural parameters