Patent ID: 6166851
Filing Date: 2000-12-26
Classification: H01S

Abstract:
In the manufacture of a gain tilt exhibiting optical amplifier having an external gain defined as the ratio between an input signal level power appearing at an optical input of the amplifier and an output signal level power appearing at an optical output of the amplifier, which optical output is optically coupled with said optical input by an optical path that includes a passive structure providing optical loss and an active gain-providing region providing optical amplification over a finite amplification waveband, which optical path includes at least one length of optical fibre having a cut-off wavelength shorter than wavelengths with the amplification waveband,a method of adjusting, after assembly of said optical path, the gain tilt exhibited at any given value of the external gain by producing a controlled optical loss increment provided by the passive structure by performance of an iteration of localised fusion operations upon a localised region of said length of optical fibre.