Ultra-high speed electro-optic polymer modulators

Wednesday, August 16, 2017 - 4:00pm
Yasufumi Enami
Speaker's Institution: 
Kochi University of Technology, Japan

Location: 472 Willamette - ITS Conference room

The ultra-bandwidth of RF transmission S21 was demonstrated for Mach-Zehnder modulators based on hybrid electro-optic polymer/sol-gel silica waveguide modulators. 
The electro-optic (EO) modulation bandwidth due to a phase velocity mismatch, based on an experimental dielectric constant, is two times wider than that of an experimental electrical transmission parameter, which indicates the EO modulation bandwidth is same as the electrical transmission bandwidth in the hybrid modulators. The EO modulation bandwidth was 246.8 GHz, based on experimental parameters. The electrical transmission bandwidth was measured up to a frequency of 110 GHz and then extrapolated to a 6-dB bandwidth of 130 GHz based on experimental parameters. The EO modulation response linearly decreased (dB scale) with respect to the modulating frequency, with an extremely small deviation less than 1.5 dB, up to 67 GHz. Large signal measurements at a transmission rate of 56 Gbit/s (equipment limited) indicated an open eye-diagram for a peak-to-peak voltage of 1.5 V. The half-wave voltage and electrode length product was 1.8 V-cm for dual driving. An in-device electro-optic coefficient was >160 pm/V at a wavelength of 1.55 mm. The half-wave voltage and loss product was 10.8 V-dB.