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We demonstrated high reflection tolerance of a quantum dot distributed feedback laser. Laser characteristics of single mode operation of 40 dB SMSR and high power operation over 15 mW were obtained, and significant improvements of tolerance up to −30 dB near end reflection were successfully achieved.
By clarifying the temperature and mirror-loss dependence of modulation bandwidth of 1.3-μm-wavelength InAs/GaAs quantum-dot lasers, temperature-stable 25-Gbps direct-modulation is achieved from 20 to 70°C with fixed bias and modulation currents.
We newly modeled the modulation bandwidth of 1.3-µm quantum-dot lasers and analyzed experimental results. The carrier transport through the active layers was found to affect significantly the modulation bandwidth with increasing stacking-number of quantum-dot layers.
The modulation characteristics of 1.3-μm InAs/GaAs high-density quantum-dot lasers is presented. The eight-stacked high-density quantum-dot layers provided high net modal gain of 46 cm-1. Fabricated Fabry-Perot lasers showed the 25-Gbps direct modulation.
Temperature-insensitive 10.3-Gb/s operation under fixed driving condition was demonstrated using directly-modulated InAs/GaAs high-density quantum dot lasers, maintaining an Ethernet mask margin of 48 % up to 100degC. 20-Gb/s direct modulation has also been demonstrated.
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