All-Optical Error Detection Using Phase Shift and Injection Coupling
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Solution Overview
Problem
Current optical communication systems incur high latency and energy consumption due to electronic error correction processes, which involve costly wavelength conversions and re-transmission of entire data packages when errors are detected, and are inefficient in handling multiple wavelengths.
Innovation Solution
An all-optical error detection and correction system using linear block codes and low-density parity check (LDPC) codes, implemented with optical gates and an injection coupler in a wavelength division multiplexing (WDM) scheme, allowing autonomous error detection and correction without converting optical signals to electrical signals, thereby eliminating the need for additional wavelength conversions and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic error correction processes are used, then error detection and correction capability is improved, but latency and energy consumption increase
Solution Approach 1:
The patent replaces electronic error correction processes with an all-optical error detection and correction system. Optical gates and constraint signals operate directly in the optical domain, eliminating the need for electro-optical conversion and electronic processing, thereby reducing latency while maintaining error correction capability
Solution Approach 2:
The patent extracts the error correction function from the electronic domain and implements it separately in the optical domain. By using optical gates that can detect and correct errors without converting to electrical signals, the system removes the bottleneck of electro-optical conversion that causes latency
2Reliability
If electronic error correction processes are used, then error detection and correction capability is improved, but energy consumption increases
Solution Approach 1:
The patent substitutes electronic error correction with optical error correction. Optical gates process constraint signals directly in the optical domain, eliminating energy-intensive electro-optical conversions and reducing overall energy consumption while maintaining reliable error detection and correction
Solution Approach 2:
The optical gates perform error detection and correction autonomously using optical constraint signals. The system self-corrects errors through optical interference and phase modulation without requiring external electronic processing, reducing energy consumption
3Reliability
If wavelength conversions are performed for error correction, then error handling capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent eliminates wavelength conversions by performing error correction directly in the optical domain. Optical gates with specific resonant wavelengths process constraint signals without requiring conversion between different wavelength domains, simplifying the device architecture
Solution Approach 2:
The patent uses a universal optical gate design that can handle multiple wavelengths through wavelength division multiplexing. The same optical gate structure processes different constraint signals at different wavelengths, eliminating the need for separate wavelength conversion components for each error correction function
4Reliability
If entire data packages are re-transmitted when errors are detected, then data integrity is improved, but productivity decreases
Solution Approach 1:
The patent segments the data package into individual bits processed by separate optical gates. Instead of re-transmitting the entire package, the system identifies and corrects only the erroneous bits through optical constraint signals, maintaining data integrity while improving transmission efficiency
Solution Approach 2:
The patent implements optical feedback mechanisms where constraint signals traverse the optical gates to detect and correct errors. The feedback from constraint signal interference patterns enables selective correction of errors without requiring complete re-transmission of the data package
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 system effectively detects and corrects errors in optical data packages within the optical domain, reducing latency and energy consumption, and enabling efficient sharing of waveguides and gates across different optical modes, while maintaining a high signal-to-noise ratio and low bit-error rate.
Implementation Method 1
The optical gates may be arranged to implement a linear block code. In response to a stored bit value, the optical gates may apply a phase shift to a constraint signal passing through the optical gates.
Implementation Method 2
an injection coupler to combine the constraint signals
Implementation Method 3
implemented with optical gates and an injection coupler in a wavelength division multiplexing (WDM) scheme
Data Source
AI summary
In example implementations, an apparatus includes a bus waveguide, a plurality of optical gates coupled to the bus waveguide and an injection coupler. The bus waveguide receives a plurality of constraint signals. Each optical gate outputs an internal state via a local phase shift when at least one of the plurality of constraint signals has a wavelength that matches a respective resonant wavelength. The injection coupler combines the at least one of the plurality of constraint signals with additional constraint signals that are injected. An error is detected in a bit of a message when an overall phase shift has occurred to the at least one of the plurality of constraint signals causing a power level to exceed a power level threshold of an optical gate when the at least one of the plurality of constraint signals constructively interferes with the additional constraint signals that are injected.