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.
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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