Electro-optic modulator of large bandwidth

摘要

An electro-optic modulator includes a substrate, a waveguide lens, a Y-shaped waveguide, and electrodes. The waveguide lens and the Y-shaped waveguide are formed in the substrate. The Y-shaped waveguide connects the waveguide lens and includes a first section dedicated for transmitting TE mode and a second section dedicated for transmitting TM mode. The electrodes are configured to modulate outputs of the waveguide lens, the first section, and the second section.

主权项

1. An electro-optic modulator, comprising:
a substrate; a planar waveguide formed in the substrate, the planar waveguide comprising a sidewall to receive a laser beam traversing along an optical axis and an interface opposite to the sidewall; a media grating loaded on the planar waveguide, the media grating and the planar waveguide constituting a waveguide lens to converge the laser beam; a pair of first electrode positioned on the planar waveguide to modulate an output of the waveguide lens by changing a refractive index of the planar waveguide; a Y-shaped waveguide formed in the substrate and comprising an input section connecting the interface to receive the laser beam, the Y-shaped waveguide further comprising a first section and a second section separating from the input section, the first section being dedicated for transmitting TE mode and comprising a first branch and a second branch, the second section being dedicated for transmitting TM mode and comprising a third branch and a fourth branch; three third electrodes comprising a modulating electrode and two ground electrodes, the modulating electrode positioned on the substrate and between the first branch and the second branch, the two ground electrodes positioned at two opposite sides of the first section, the modulating electrode and the ground electrodes being configured to modulate an output of the first section by changing refractive indexes of the first branch and the second branch; and a pair of fourth electrodes positioned on the substrate and covering the third branch and the fourth branch, respectively, the fourth electrodes being configured to modulate an output of the second section by changing refractive indexes of the third branch and the fourth branch.