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A compact (200 μm) spot-size converter (SSC) with a vertically tapered core layer is developed, which is fabricated with a simple wafer process using the micro-loading effect. It is confirmed that the vertical spot size of the SSC exceeded 2 μm, which was double that of the original waveguide. As a result, an InP waveguide integrated with the SSCs exhibited a coupling loss of <1 dB per facet for...
We have successfully demonstrated an all-in-one coherent receiver for 112-Gbit/s DP-QPSK signal detection by developing a new silica-based PLC hybrid integration technology with multi-channel micro collimator optics and hermetically sealed O/E converters.
A traveling-wave-electrode InP n-p-i-n Mach-Zehnder modulator monolithically integrated with a semiconductor optical amplifier was developed. Loss-less operation and full C-band 40-Gbit/s DPSK modulation with a low driving voltage of 3 Vpp was successfully demonstrated.
Operation at 40 Gbit/s with a constant driving voltage (3.5 Vpp) for the entire L-band was demonstrated with a newly developed compact InP-based DQPSK module. A linear DC bias voltage control was employed to compensate for a wavelength dependence of the half-wavelength voltage.
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