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InGaAsP/InP butt-jointed, buried ridge DBR lasers, exhibiting a record 15 nm tuning range, have been realised using only a three-step MOVPE process. The highest number (38) ever reported of regularly spaced wavelength channels is obtained from a two-section DBR laser, in which the passive waveguide was optimised in terms of carrier-induced effective index change and active-passive coupling efficiency.
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Delorme et al. (1995) studied this question.
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