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We have characterised the temporal-spectral behavior of 1.5 ?m wavelength cleaved-coupled-cavity (C3) lasers. Single longitudinal mode discrimination ratios in excess of 500:1 have been obtained under high bit rate modulation. Bit error rate of less than ? 10?9 were obtained under single-frequency operation with direct modulation up to 1 Gbit/s. Averaged frequency tuning rates as large as 26 ?/mA...
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