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Optically pumped membrane BH-DFB lasers for low-threshold and single-mode operation

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6 Author(s)
Okamoto, T. ; Res. Center for Quantum Effect Electron., Tokyo Inst. of Technol., Japan ; Nunoya, N. ; Onodera, Y. ; Yamazaki, T.
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High optical confinement and high index coupling in 1.55 μm-wavelength GaInAsP-InP membrane buried heterostructure distributed feedback (BH-DFB) lasers consisting of deeply etched single-quantum-well wire-like active regions were demonstrated under room-temperature (RT) continuous-wave (CW) optical pumping. A threshold pump power of 1.5 mW and a submode suppression ratio (SMSR) of 42 dB were obtained for a 142-nm-thick membrane with a cavity length of 120 μm and a stripe width of 2 μm. We have also realized membrane BH-DFB laser arrays by arranging the laser cavities (10 μm spaced 15 elements with five different grating periods). A total wavelength span of 72 nm was achieved with a small lasing wavelength fluctuation up to 1.2 nm at RT-CW condition under optical pumping. From this value, membrane thickness fluctuation was estimated to be 0.4 nm. Threshold pump power of 3.4 mW and SMSR of 45 dB were achieved in a typical device.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:9 ,  Issue: 5 )