Noise management for optical time delay interferometry

An integrated fiber optic interferometry interrogator system to generate superimposed waves, the system comprising:

• an optical light source, wherein the optical light source generates a first signal;
• a first signal splitter coupled to an output of the optical light source, wherein the first signal splitter splits the first signal into a reference signal and an interrogation signal;
• a first optical modulator to modulate the reference signal;
• a second optical modulator to modulate the interrogation signal;
• a fiber coupler connected to a fiber under test;
• a circulator comprising a plurality of connections, wherein
• a first connection of the plurality of connections receives the modulated interrogation signal,
• a second connection of the plurality of connections transmits the modulated interrogation signal through the optical coupler and receives from the optical coupler a modulated signal backscattered from the fiber under test, and
• a third connection of the plurality of connections that transmits through an isolator the modulated signal backscattered from the fiber under test;
• a signal mixer comprising a plurality of signal couplers configured to
• receive the modulated signal backscattered from the isolator connected to the fiber under test,
• receive the reference signal modulated by the first optical modulator,
• mix the two received signals into the superimposed waves, and
• transmit the superimposed waves into a plurality of photo diodes, wherein one or more of the photo diodes output an RF signal comprising the superimposed waves.