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We developed 40 Gb/s traveling wave electroabsorption modulator-integrated DFB laser (TW-EML) modules using several advanced technologies. This 40 Gb/s EML device adopted traveling wave electrode structures and showed the result that the measured 3 dB bandwidth of the electrical-to-optical (E/O) response reached about 45 GHz and the return loss (S11) was kept below -10 dB up to 50 GHz. For the module...
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