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New scheme of quantum-well-intermixing (QWI) enhancement is proposed for SOA/EAM integration. Using supercritical-fluid, QWI can be performed at low temperature regime, leading to 10dB improvement in optical modulation. 13dB modulation, 17dB gain and >15GHz f-3dB were observed in 100μm long EAM, confirming simple integration scheme.
High-bandgap offset 1300nm InAlGaAs quantum well (QW) has been used for electroabsorption modulator. High conduction/valance bandgap offset ratio allows strong exciton effect under high electric field, leading to broadband operation. >10dB extinction ratio from 1280nm to 1320nm and 40GHz of electical-to-optical response has been demonstrated.
A new high-speed 1300nm directly modulated DFB laser with high power has been demonstrated. With low parasitic capacitance of coplanar electrodes, 25mW has been obtained in a long waveguide, while maintaining high-speed performance. 50Gb/s PAM-4 modulation over 35km transmission without amplification has been realized with low degradation.
A new electroabsorption modulator (EAM) has been demonstrated using quantum well intermixing (QWI) method. Through local area of QWI, 110nm wavelength blue shift was attained in strip pattern of SiO2 deposition, forming optical waveguide structure and also leading to sensitive and efficiency voltage-driven optical modulation.
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