High slope efficiency and low noise characteristics intapered-active-stripe DFB lasers with narrow beam divergence |
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Authors: | Kito M. Inaba Y. Nakayama H. Chino T. Ishino M. Matsui Y. Itoh K. |
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Affiliation: | Electron. Res. Lab., Matsushita Electron. Corp., Osaka; |
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Abstract: | 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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