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High-performance devices have been developed in the 1.5- mu m wavelength range by transversely integrating the lasing and tuning functions, enabling continuous wavelength tuning over a frequency range up to 900 GHz. The convenient wavelength tuning by a single control current in a tunable twin-guide (TTG) distributed-feedback (DFB) structure makes these lasers very attractive for application in coherent detection, and initial system demonstrators have already proved their suitability in practice.>
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Amann et al. (1993) studied this question.
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