A 22-GHz directly modulated 3-dB bandwidth could be obtained by 1.3-mm-long weakly laterally coupled distributed Bragg reflector lasers fabricated by focused ion beam lithography. In addition to a high bandwidth, the lasers show a stable emission spectrum with side-mode suppression ratios of more than 40 dB and output powers exceeding 20 mW.

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The modulation bandwidth of InP based lasers was enhanced by utilizing higher order resonances in the detuned loading regime. With a new three-section design a modulation bandwidth of 37 GHz was obtained , well beyond the relaxation frequency. 1

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