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We demonstrated 25-Gbps direct modulation up to 85 degC with a 1.3-mum InGaAlAs RWG-MQW-DFB laser. The dependence of the relaxation oscillation frequency on current was 3.3 GHz/mAfrac12 and this is the highest value ever reported.
An 80-km SMF transmission at 10-Gb/s using a 1.55-mum, InGaAlAs EML was demonstrated over an extended temperature range (-25degC to 100degC). A dynamic extinction ratio of over 9 dB at -25degC was obtained.
We demonstrate two types of high-speed semiconductor optical modulators operating at 40 Gbit/s with reduced driving voltage. One is a compact Mach-Zehnder modulator module that achieves error-free operation in a push-pull configuration with a peak-to-peak voltage of 1.3 V. The other is an electroabsorption modulator integrated with microwave coplanar waveguides and driven by a voltage as low as 0...
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