PHOTONIC INTEGRATED CIRCUIT AND OPTICAL TRANSMITTER

A photonic integrated circuit includes a main light source, a redundant light source, a controller, an optical switch, and a modulator. The main light source outputs main light through a main light input waveguide. The redundant light source outputs redundant light through a redundant light transmission waveguide. The controller generates a first switch signal based on a fault state of the main light source. The optical switch selectively provides the redundant light from the redundant light transmission waveguide to a redundant light input waveguide based on the first switch signal. The modulator modulates main light from the main light input waveguide or redundant light from the redundant light input waveguide and outputs a first optical signal. 光子集成电路包括主光源、冗余光源、控制器、光学开关和调制器。主光源通过主光输入波导输出主光。冗余光源通过冗余光传输波导输出冗余光。控制器基于主光源的故障状态生成第开关信号。光学开关基于第开关信号将来自冗余光传输波导的冗余光选择性地提供给冗余光输入波导。调制器调制来自主光输入波导的主光或来自冗余光输入波导的冗余光并输出第光学信号。