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40-Gbps transmission over 5-km single-mode fiber using a directly modulated 1.3-μm AlGaInAs MQW distributed-reflector laser was demonstrated. Error-free operations up to 70°C have been achieved.
AlGaInAs distributed-reflector lasers with 4 different wavelengths on LAN-WDM grid were fabricated using the same MQW active layers. These lasers provided output power of over 10 mW and clear eye-opening under 25.8-Gbps direct modulation at 50C.
1.55-mum AlGaInAs semi-insulating buried-heterostructure distributed reflector lasers with 75-mum-long active region achieved very high slope values of relaxation oscillation frequency of 4.5 (25degC) and 3.5 GHz/mA1/2 (85degC), which realized 40-Gbps direct modulation up to 85degC.
We introduce our recent works on directly-modulated AlGaInAs quantum-well lasers with semi-insulating buried-heterostructure for ultra-high-speed transmission. The short-cavity 1.3-µm-wavelength DFB lasers showed low-penalty transmission up to 13 km under direct modulation at 25 Gbps, as well as clearly-opened eye patterns by 40-Gbps direct modulation. For further reduction of driving current in the...
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