Back to results
US 12,191,870 B2Granted
Clock jitter and spurious tone cancellation system using optical delay
AssigneeCisco Technology, Inc.
InventorsAbhishek Bhat, Sujit Handanhal Ramachandra
Life of this patent
Estimating the term…
Abstract
Techniques to reduce or eliminate phase noise and jitter from a noisy clock signal. A method includes generating an electrical clock signal, generating a delayed optical clock signal based on the electrical clock signal, detecting a phase difference between the electrical clock signal and the delayed optical clock signal, and processing, based on the phase difference, the electrical clock signal to obtain a reduced phase noise version of the electrical clock signal.
Claims20
A method comprising:
- generating an electrical clock signal;
- generating, using a photonic crystal resonator in a photonics integrated circuit, a delayed optical clock signal based on the electrical clock signal;
- detecting a phase difference between the electrical clock signal and the delayed optical clock signal;
- and
- processing, based on the phase difference, the electrical clock signal to obtain a reduced phase noise version of the electrical clock signal.
2 more elements
A method comprising:
- generating a clock signal;
- modulating an optical signal based on the clock signal to obtain a modulated optical signal;
- delaying, using a photonic crystal resonator in a photonics integrated circuit, the modulated optical signal to obtain a delayed modulated optical signal;
- converting the delayed modulated optical signal to an electrical signal;
- detecting a phase difference between the electrical signal and the clock signal;
- and
- processing, based on the phase difference, the clock signal to obtain a reduced phase noise version of the clock signal.
4 more elements
A device comprising:
- a clock configured to generate a clock signal;
- an optical modulator configured to modulate an optical signal based on the clock signal to obtain a modulated optical signal;
- an optical delay comprising a photonic crystal resonator disposed in a photonics integrated circuit, configured to delay the modulated optical signal to obtain a delayed modulated optical signal;
- a photo detector configured to convert the delayed modulated optical signal to an electrical signal;
- a phase detector configured to detect a phase difference between the electrical signal and the clock signal;
- and
- a voltage controlled delay line configured to process, based on the phase difference, the clock signal to obtain a reduced phase noise version of the clock signal.
4 more elements
Dependencies are inferred from the claim text.