Universal Cascadable Photonic Gates With Nonlinear Error Correction
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Solution Overview
Problem
Photonic circuits suffer from amplitude and phase errors that propagate and accumulate through cascaded gates, leading to signal degradation and the need for improved cascadability, logic-level restoration, fan-in, and fan-out capabilities.
Innovation Solution
A photonic circuit design incorporating cascading connections of linear photonic gates and nonlinear photonic components, including all-optical amplitude thresholders, to correct accumulative errors and ensure error-free logic levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cascaded photonic gates are used to implement photonic logic, then logic operations can be performed, but amplitude errors and phase errors propagate and accumulate through the circuit
Solution Approach 1:
A nonlinear photonic circuit is introduced as an intermediary component between photonic gates to correct accumulated errors. This circuit includes a first nonlinear photonic circuit that receives intermediate output signals from photonic gates and generates corrected output signals, and a second nonlinear photonic circuit that receives signals from the first nonlinear circuit and generates final output signals. These intermediary circuits compensate for amplitude and phase errors that would otherwise propagate through the cascaded gates.
Solution Approach 2:
The patent applies nonlinear transfer functions that change the amplitude and phase parameters of photonic signals to restore logic levels. The first nonlinear photonic circuit applies a first nonlinear transfer function to correct errors from photonic gates, and the second nonlinear photonic circuit applies a second nonlinear transfer function to further correct signals before final output, thereby maintaining signal quality through parameter transformation.
2Adaptability or versatility
If photonic gates are cascaded to achieve fan-in and fan-out requirements, then logic versatility is improved, but signal degradation increases
Solution Approach 1:
Nonlinear photonic circuits serve as intermediary error correction stages between cascaded photonic gates. The first nonlinear photonic circuit receives signals from multiple photonic gates (satisfying fan-in requirements) and generates corrected signals, while the second nonlinear photonic circuit processes these corrected signals to satisfy fan-out requirements to multiple subsequent gates, thereby maintaining signal quality throughout the cascaded structure.
Solution Approach 2:
Nonlinear transfer functions are applied to change the amplitude and phase parameters of signals passing through cascaded gates. The first nonlinear photonic circuit transforms signals to restore logic levels after gate operations, and the second nonlinear photonic circuit applies additional parameter transformation to ensure signals maintain sufficient quality for driving multiple subsequent gates, enabling fan-out while preserving signal integrity.
3Use of energy by moving object
If linear photonic gates are used for signal processing, then switching energy is reduced, but amplitude and phase errors are introduced
Solution Approach 1:
Nonlinear photonic circuits are introduced as intermediary components between linear photonic gates to correct errors without requiring additional linear gates. The first nonlinear photonic circuit receives intermediate output signals from linear photonic gates and generates corrected output signals by applying a first nonlinear transfer function, and the second nonlinear photonic circuit similarly corrects signals from the first nonlinear circuit, thereby compensating for amplitude and phase errors introduced by linear gates.
Solution Approach 2:
Nonlinear photonic circuits apply nonlinear transfer functions to change the amplitude and phase parameters of signals, restoring logic levels that have been degraded by linear photonic gates. The first nonlinear photonic circuit transforms intermediate output signals to correct errors, and the second nonlinear photonic circuit applies additional parameter transformation to ensure signal accuracy is restored, thereby compensating for the limitations of linear gate operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves cascadable photonic circuits with restored logic levels, supporting multiple logic operations and fulfilling requirements for fan-in and fan-out, enhancing signal quality and efficiency.
Implementation Method 1
The first nonlinear photonic circuit is configured to generate one or more first photonic output signals at the one or more first outputs by applying a first nonlinear transfer function of the first nonlinear photonic circuit to the one or more first photonic intermediate output signals
Data Source
AI summary
A photonic circuit configured to operate as a universal photonic gate. The photonic circuit includes at least a first photonic gate and a first nonlinear photonic circuit coupled to the first photonic gate. The first photonic gate receives one or more photonic input signals and generates, based at least in part on the one or more photonic input signals, one or more first photonic intermediate output signals. The first nonlinear photonic circuit receives the one or more first photonic intermediate output signals and generates one or more first photonic output signals by applying a first nonlinear transfer function of the first nonlinear photonic circuit to the one or more first photonic intermediate output signals. A logical function of the photonic circuit depends on phase shifts applied by phase shifters of the first photonic gate and an amplitude value of a bias signal input into the first photonic gate.