We report a compact 2 × 2 Mach–Zehnder interferometer(MZI) electro-optic switch fabricated on a siliconon-insulator using standard complementary metal-oxide semiconductor(CMOS) processes. With a short modulation arm length of 200 μm, the crosstalk is reduced to-22 d B by the new modulation scheme of push–pull modulation with a pre-biased π∕2 phase shift. The new modulation scheme can also work with a fast switching time of about 5.4 ns.
We report a polarization dependent reflection phenomenon beyond the normal incidence with a subwavelength nanorod chain.Light waves of the transverse electric mode will be totally reflected while those of the transverse magnetic mode will transmit through.The total reflection or transmission phenomenon can be seen as a constructive or destructive interference of the incident field with the transverse mode field of the chain.With the low-loss feature and the ultra-compact characteristic,this structure may find applications in photonic circuits.
A novel hybrid Ⅲ–Ⅴ/silicon deformed micro-disk single-mode laser connecting to a Si output waveguide is designed, and fabricated through BCB bonding technology and standard i-line photolithography. Compared to a traditional circular micro-disk in multi-longitudinal-mode operation, unidirectional emission and single longitudinal-mode output from a Si waveguide are realized. In the experiments, an output power of 0.31 mW and a side-mode suppression ratio of 27 dB in the continuous-wave regime are obtained.
