A newly fabricated InGaAlAs/lnAlAs multiquantum well (MQW) waveguide phase modulator module is reported. A low connector-connector insertion loss of 7.98 dB is obtained together with a wide modulation bandwidth of over 18 GHz by employing an aspherical lens and tapered microstripline. The π-driving voltage at 1.55 µm is 2.8 V for TE polarised light and the accompanying residual intensity modulation is 3.6 dB.
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Yoshida et al. (1994) studied this question.
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