Systems and methods for clock generation and calibration in photonic systems

An apparatus comprising:

• a first delay line configured to receive an input clock signal and generate a first clock signal by providing a first delay to the input clock signal;
• a second delay line configured to receive the input clock signal and generate a second clock signal by providing a second delay to the input clock signal;
• a phase detector coupled to the first delay line and the second delay line, the phase detector being configured to determine a phase difference between the first clock signal and the second clock signal;
• a comparator coupled to the phase detector, the comparator being configured to generate an output signal based on the phase difference;
• and
• a controller coupled to the comparator, the controller being configured to generate a first control signal and a second control signal based on the output signal, the first control signal being associated with the first delay, and the second control signal being associated with the second delay.

An apparatus comprising:

• a first delay line configured to receive an input clock signal and generate a first clock signal by providing a first delay to the input clock signal;
• a second delay line configured to receive the input clock signal and generate a second clock signal by providing a second delay to the input clock signal;
• a phase detector coupled to the first delay line and the second delay line, the phase detector being configured to determine a phase difference between the first clock signal and the second clock signal;
• a comparator coupled to the phase detector, the comparator being configured to generate an output signal based on the phase difference;
• and
• a controller coupled to the comparator, the controller being configured to generate a first control signal based on the output signal, the first control signal being configured to adjust the first clock signal relative to a reference clock signal.