The present invention relates to the stabilisation of the lasing wavelength of a laser source using feedback from a fibre pigtail grating. An optical fibre (50) is first aligned and joined to a laser source (102), in particular a laser diode, so that laser output optical radiation (112) is coupled (52) into the fibre (50). One or more optical characteristics (66,78) of the laser source (102) are determined, such as optical power (68) vs. drive current (70) and the laser spectrum (78). A grating (132) is then formed in the optical fibre (50), which reflects back (97) into the laser source (102) a proportion of said optical radiation (52) coupled into the optical fibre. This has the effect of stabilising the output wavelength (80) of the laser source (102). The process helps to ensure that one or more optical characteristics (94,134) of said formed grating (132) are matched to the laser source (102) according to said one or more determined optical characteristics (66,78) of the laser source (102).
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