Rare earth doped optical fiber amplifiers

Details Rare earth doped optical fiber amplifiers Rare earth doped optical fiber amplifiers

H - Electricity

01

S

H01S 3/06 (2006.01) C03B 37/018 (2006.01) C03C 13/04 (2006.01) G02B 6/036 (2006.01) H01S 3/067 (2006.01) H01S 3/08 (2006.01) H01S 3/094 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2110930

In accordance with the present invention, an optical amplifier is provided having an erbium doped fibre, without erbium confinement, having a NA higher than 0.2 in which the background loss of the fibre at the pump wavelength is at a level which does not significantly reduce the optimum gain efficiency of the amplifier from its theoretical value. Briefly, this is achieved by having the difference in the coefficients of thermal expansion of the core and cladding adjacent the core/cladding interface at a value which is less than a predetermined value which corresponds to a ratio of erbium loss to background greater than a predetermined ratio.

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