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An all fibre, widely tunable, single frequency, semiconductor ring laser was constructed with a narrow linewidth of 35 kHz. Tuning over 50 nm was electronically obtained using a fibre Fabry-Perot filter as a selected wavelength element. Single-frequency operation was demonstrated with sidemode suppression higher than 35 dB.
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Chawki et al. (1993) studied this question.
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