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Multiwavelength erbium-doped fibre laser based on a high-birefringence fibre loop mirror

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5 Author(s)
Dong, X.P. ; Dept. of Electron. Eng., Xiamen Univ., China ; Shenping Li ; Chiang, K.S. ; Ng, M.N.
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A novel multiwavelength fibre laser is proposed, which is based on a fibre loop mirror formed by a high-birefringence (HiBi) fibre, a polarisation controller, and a directional coupler. By setting the polarisation controller properly, the HiBi fibre loop mirror acts as a polarisation-independent wavelength filter. With this configuration, the wavelength spacing of the laser can be varied accurately by adjusting the length of the HiBi fibre. Experimentally, by cooling the erbium-doped fibre with liquid nitrogen to reduce its homogeneous linewidth, stable emission at 16 wavelengths with a spacing of 0.8 nm and an amplitude variation of <5 dB was achieved

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Electronics Letters  (Volume:36 ,  Issue: 19 )