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High-speed directly modulated single-mode lasers are attractive light sources for compact, low-power-consumptive optical modules. For next-generation optical modules, attempts for higher modulation speed at high temperatures are energetically studied.
We introduce our recent works on AlGaInAs quantum-well lasers with semi-insulating buried-heterostructure for ultra-high-speed transmission. The short-cavity DFB lasers show high-speed direct modulation at 25 and 40 Gbps, and the distributed reflector lasers with shortened active-region length provide reduced driving current in ultra-high-speed direct modulation.
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