Depolarization

A depolarizer circuit, comprising:

• an input waveguide configured to receive light;
• a splitter connected to the input waveguide and configured to provide, at a first output of the splitter, light in a first polarization state and, at a second output of the splitter, light in a second polarization state;
• a first rotator connected to the first output of the splitter and configured to rotate light received therefrom from the first polarization state to the second polarization state;
• a first delay line connected to the second output of the splitter;
• a coupler comprising a first and second output and configured to couple the light received from the first rotator and the first delay line;
• a second rotator connected to the first output of the coupler and configured to rotate light received therefrom back to the first polarization state;
• a second delay line connected to the second output of the coupler;
• and
• a combiner connected to the second rotator and the second delay line and configured to combine light received from each thereof as depolarized light,
• wherein the first and second delay lines provide a phase delay difference there between being greater than or equal to a coherence of the light received by the input waveguide.