Waveguide photo detector integrated with a plurality of optical feeding waveguide ports

A silicon photonics unit that comprises:

• an input waveguide that is configured to convey an input optical signal;
• a distribution unit (DU) that comprises a DU input port, a first DU output port, a second DU output port and a distribution core;
• wherein the distribution core is configured to receive the input optical signal, split the input optical signal to a first optical signal and a second optical signal, provide the first optical signal to the first DU output port and provide the second optical signal to the second DU output port;
• a photodetector (PD) that comprises a first optical input port, a second input port, and an electrical output port;
• wherein the PD is configured to output, via the PD output port, a PD output signal indicative of the first optical signal and the second optical signal;
• a first optical path that comprises a first waveguide and is configured to convey the first optical signal to the PD's first optical input port;
• a second optical path that comprises a second waveguide and is configured to convey the second optical signal to the PD's second optical input port;
• and
• one or more compensation elements that are configured to compensate for at least one error related to the first optical signal and the second optical signal;
• wherein a compensating element of one or more compensation elements is included in the PD.