Monolithically Integrated DFB-EA for 100 Gb/s Ethernet

The world's first monolithically integrated distributed feedback laser and electroabsorption (EA) modulator with an expected $\geq$100 GHz $-$3 dBe bandwidth suitable for 100 Gb/s operation with on–off keying is presented. The design of the EA modulator uses a traveling-wave structure with three active segments and a total active length of 180 $\mu\hbox{m}$ resulting in $ \sim$2.5 V peak-to-peak drive voltage for 10 dB optical extinction ratio and low electrical reflection.