Patent ID: 7826689
Filing Date: 2010-11-02
Classification: G02B,G02F

Abstract:
1. An optical device comprising: a coupler formed on a substrate and having first and second ports and third and fourth ports opposite to the first and second ports, respectively, for outputting first-polarization-mode light input from one port to a port diagonally opposite to the one port and for outputting second-polarization-mode light input from one port to a port opposite to the one port; a first modulator formed on the substrate and including a first optical waveguide connected to the first port for modulating first-polarization-mode light input to the first optical waveguide and for outputting the modulated first-polarization-mode light to the first port; a second modulator formed on the substrate and including a second optical waveguide connected to the third port for modulating first-polarization-mode light input to the second optical waveguide and for outputting the modulated first-polarization-mode light to the third port; and a polarization mode conversion section for converting the first-polarization-mode light which is input from the second modulator to the third port and which is output to the second port diagonally opposite to the third port into second-polarization-mode light and for returning the second-polarization-mode light to the second port.