25 November 2009 An investigation on multiwavelength laser using a semiconductor optical amplifier
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The paper demonstrates a novel multi-wavelength ring laser for light source in dense wavelength division multiplexing (DWDM) system, which consists of semiconductor optical amplifier (SOA), high-birefringence fiber loop mirror (Hi-Bi FLM), polarization controller, etc. Among these devices, SOA is used as optical gain medium; Hi-Bi FLM serves as wavelength selecting comb filter. When SOA is driven with higher injection current, the number of output multi-wavelength, and the single channel power and total power all increase gradually due to the inhomogeneous broadening in SOA gain medium. When SOA is driven with a 280-mA dc current at room temperature, it tends to gain saturation state, and simultaneous stable oscillation of 18 lines with the equal line spacing of 0.8 nm (100 GHz) is obtained in the range of 1571.3 nm ~ 1587.1 nm. The power fluctuation among the lasing lines is less than 6 dB and each line-width is less than 0.118 nm. Furthermore, the signal to noise ratio is greater than 25 dB. By adjusting the polarization controller in Hi-Bi FLM, the frequency tuning range of the overall output multi-wavelength is up to 50 GHz.
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Yangbo Bai, Wanghua Xiang, Xiaoyan Xu, Zhaoying Wang, Fang Ren, Xiaozhou Shi, "An investigation on multiwavelength laser using a semiconductor optical amplifier", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060O (25 November 2009); doi: 10.1117/12.838672; https://doi.org/10.1117/12.838672

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