Apparatus for measuring performance of coherent optical receiver

An apparatus for measuring performance of a coherent optical receiver, comprising:

• a beam splitter configured to split light received from a light source into a first path light and a second path light;
• a first optical modulator configured to receive the first path light of the beam splitter and optically modulate the received first path light;
• a variable optical attenuator configured to control and output an optical power of an output of the first optical modulator;
• a first polarization controller configured to transmit a first output signal controlling polarization of an output of the variable optical attenuator to the coherent optical receiver;
• a second optical modulator configured to receive the second path light of the beam splitter and optically modulate the received second path light;
• a variable optical delay line configured to delay and output time of an output of the second optical modulator;
• a second polarization controller configured to transmit a second output signal controlling polarization of an output of the variable optical delay line to the coherent optical receiver;
• a network analyzer configured to receive an output of the coherent optical receiver to measure performance of the coherent optical receiver and control the first optical modulator and the second optical modulator;
• and
• a controller configured to receive a control signal from the network analyzer and transmit the received control signal to the first optical modulator and the second optical modulator.