Peripheral coupled waveguide traveling-wave electroabsorption modulator

We present the design and preliminary analysis of an efficient and wide bandwidth peripheral coupled waveguide traveling-wave electroabsorption modulator (PCW-TW-EAM), which aims to decouple the optical waveguide and the microwave transmission line. The optical waveguide mode of this device is designed to closely match to a single mode fiber mode for the ease of coupling. The waveguide has presently shown an optical propagation loss of similar to2dB/mm at the modulation wavelength which is essential for wide bandwidth and high modulation efficiency to be achieved in the same design. Simulations indicate that equivalent V-pi less than 1V over a very large bandwidth can be obtained.