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Modern WDM telecommunication systems require stable and calibrated laser sources. In this paper we present examples of such lasers based on erbium-doped fibres: discretely tunable and multiwavelength ring lasers. For the first case tuning is possible due to tunable Bragg grating overlapping spectrally the third telecommunication window (1550 nm). When a Fabry-Perot etalon is inserted into the cavity,...
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