Simultaneous oscillation of wavelength-tunable, singlemode lasers using an Er-doped fibre amplifier

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Abstract
A compound fibre-ring cavity with just one Er-doped fibre amplifier yields wavelength-multiplexed laser lights, each of which is wavelength-tunable and singlemoded with a spectral linewidth <1MHz. The allowable cavity-loss fluctuation for maintaining simultaneous lasing is ∼1dB.