Optical Modulator With Reduced Size And Optical Transmitter Including The Same

An optical modulator includes a light input/output unit receiving an incident optical signal which has not been modulated, splitting the incident optical signal into a first optical signal and a second optical signal, and transmitting the first and second optical signals to a first path and a second path, respectively, of an optical waveguide. A phase shifter is positioned in at least one of the first and second paths and modulates a phase of at least one of the first and second optical signals, which have been received through the first and second paths, respectively, in response to an electrical signal. A phase-modulated signal is output. A reflective grating coupler reflects signals respectively received through the first and second paths back along the first and second paths respectively. 种具有减小尺寸的光学调制器。该光学调制器，包括光输入/输出单元，其接收没有被调制的入射光学信号，将入射光学信号分束为第光学信号和第二光学信号，将第和第二光学信号分别发送到光学波导的第路径和第二路径。移相器位于第和第二路径中的至少个中，并且响应于电信号来调制分别通过第和第二路径接收的第和第二光学信号中的至少个的相位。输出相位调制信号。反射光栅耦合器将分别通过第和第二路径接收的信号分别沿着第和第二路径反射回来。