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Multielectrode DFB LDs, which have a flat frequency-modulation response ranging from 50 kHz to 500 MHz and a minimum spectral linewidth of 4.5 MHz, are developed. A 2 Gbit/s optical CPFSK 202 km transmission experiment is conducted using the newly developed LD without optical feedback.
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Iwashita et al. (1987) studied this question.
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