Photonic Precision Delay Component for Jitter-Stable Clock Alignment
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Solution Overview
Problem
High-frequency applications such as time-interleaved ADC architectures face performance degradation due to timing uncertainties and clock jitter, which are exacerbated by component tolerances and spatially variant thermal loads in photonic-assisted electronic devices, leading to inaccuracies in optical clock signal propagation.
Innovation Solution
An electronic-photonic integrated precision delay-control component with a coarse-delay switching unit and a tuneable fine-delay unit, arranged in series, to precisely control the group delay of optical input signals, allowing for dynamic adaptation of total delay amounts and minimizing jitter-related errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photonic-assisted sampling is used to improve jitter performance, then timing precision is improved, but component tolerances and thermal loads cause propagation time inaccuracies
Solution Approach 1:
The patent implements a feedback mechanism where the actual propagation time of the optical clock signal is measured and compared against the desired value. Based on this comparison, control signals are generated to adjust the photonic delay component, dynamically compensating for inaccuracies caused by component tolerances and thermal effects, thereby maintaining reliable timing precision
Solution Approach 2:
The patent changes the delay parameter of the photonic delay component dynamically by adjusting the optical path length or refractive index through controlled mechanisms. This allows the system to adapt to varying thermal conditions and component tolerances, maintaining accurate propagation time despite environmental changes
2Productivity
If multiple ADC blocks are used in time-interleaved architecture, then sampling rate is improved, but phase offset errors and timing uncertainty deteriorate performance
Solution Approach 1:
The patent employs a universal optical clock distribution system that serves multiple ADC blocks simultaneously. By using a single photonic delay component to control all ADC clock signals, the system ensures consistent timing precision across all channels, eliminating phase offset errors that would otherwise arise from independent electronic timing circuits
Solution Approach 2:
The patent introduces an optical clock signal as an intermediary between the timing control mechanism and the ADC blocks. This optical intermediary provides a common reference that synchronizes all ADC blocks with femtosecond precision, ensuring accurate phase alignment while enabling high sampling rates through parallel operation
3Measurement precision
If clock signal timing is controlled to femtosecond precision, then sampling accuracy is improved, but component tolerances and thermal effects cause timing deviations
Solution Approach 1:
The patent implements real-time monitoring of thermal conditions and propagation time in the optical clock distribution system. When thermal effects cause timing deviations, the feedback control mechanism adjusts the photonic delay component to compensate for these changes, maintaining femtosecond-level timing precision despite thermal variations
Solution Approach 2:
The patent designs the optical distribution system with built-in compensation capabilities that anticipate thermal effects. The photonic delay component is configured to pre-compensate for expected thermal drift, and the feedback mechanism continuously corrects any deviations before they affect sampling accuracy, cushioning against thermal load effects
Data Source
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AI summary
An electronic-photonic integrated precision delay-control component comprises a coarse-delay switching unit that is configured to assume one of a plurality of selectable switching states and to feed, in a given one of the switching states, an optical input signal forward to at least one of a plurality of selectable optical coarse-delay paths. A controllable fine-delay unit is configured to subject the optical input signal to a selectable fine group-delay amount that is tuneable between zero and a maximum fine group-delay amount. The coarse-delay switching unit and the fine-delay unit are arranged in a series connection to control application of a respective total group-delay amount to the optical input signal on any selectable total delay path, the total group-delay amount corresponding to a sum of the respective coarse group-delay amount and of the selectable fine group-delay amount. Co-integration of electronic components allows a complete pulse train generation on one chip with low sensitivity to perturbation, low drift and low manufacturing costs. A desired delay of individual pulses of the optical input signal can be tuned on chip with particularly high precision at particularly high pulse repetition frequencies.