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High slope efficiency and low noise characteristics in tapered-active-stripe DFB lasers with narrow beam divergence

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7 Author(s)
Kito, M. ; Electron. Res. Lab., Matsushita Electron. Corp., Osaka, Japan ; Inaba, Y. ; Nakayama, H. ; Chino, T.
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We report high slope efficiency and low noise characteristics in a distributed feedback (DFB) laser lasing at 1.3 μm with narrow beam divergence by employment of a laterally tapered active stripe over the whole cavity. This tapered structure is designed to realize narrow beam divergence, low threshold current, and high longitudinal mode selectivity. The fabricated tapered-active-stripe DFB lasers demonstrated of 9.20×13.40 and a record slope efficiency, for a narrow beam DFB laser, of 0.59 mW/mA. The temperature characteristics from -10°C to 85°C shows high output power at high temperature, stable single longitudinal mode oscillation and stable far-field patterns. Furthermore, for the first time ever, a low relative intensity noise characteristic of under -155 dB/Hz has been realized when butt-coupling into a single-mode fiber

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Quantum Electronics, IEEE Journal of  (Volume:35 ,  Issue: 12 )

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