Asymmetric cladding for distributed feedback lasers at 1.5 μm with high power and narrow linewidth

作者：Yu Liqiang; Liang Song; Lu Dan; Pan Biwei; Zhang Limeng; Guo Lu; Zhao Lingjuan

来源：Chinese Journal of Lasers, 2015, 42(s1): s102012.

DOI：10.3788/CJL201542.s102012

• Asymmetric cladding
• Direct current
• Fabry-Perot cavity
• High power
• Maximum output power
• Narrow-line width
• Side mode suppression ratios
• Single wavelength

We have prepared a ridge waveguide distributed feedback (DFB) laser emitting at 1.5 μm. To gain maximum output power of the laser, we choose asymmetric cladding layer structure. By simulation, it is found that while the lower cladding is 450 nm, the laser has minimum inner loose coefficient, and first order mode (m=1) can has minimum limiting factor. The loose coefficient of prepared tube core is 9.78 cm-1, which matches well with the loose coefficient of simulation 9.3 cm-1. Under the direct current of 600 mA, the maximum power of prepared Fabry-Perot (F-P) cavity laser is greater than 114 mW. Under the direct current of 225 mA, the prepared DFB laser with single-wavelength has side-mode suppression ratio of 45dB, output power of 40 mW and spectrum line width smaller than 400 kHz.

• 出版日期2015