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Using a DFB-LD with two longitudinal modes in the 1.55 μm region, the mode stability was examined experimentally. It is found that these modes are very stable under direct modulation at least up to around 300 Mbit/s and there is no power penalty due to mode partition noise in 97 km single-mode-fibre transmission at 280 Mbit/s.
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Yamamoto et al. (1984) studied this question.
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