Optical Signal Processing Device for High-Speed Reservoir Computing
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Solution Overview
Problem
Conventional optical implementation methods for reservoir computing generate mask functions in the electric domain, leading to bottlenecks in signal processing speed.
Innovation Solution
An optical signal processing device that generates a mask function in the optical domain, utilizing a light source, optical modulation means, an optical circulation unit with a nonlinear response element, and a signal processing circuit to achieve high-speed reservoir computing by modulating and demodulating optical signals within an optical FIR filter unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mask function is generated in electric domain, then RC computing can be implemented, but signal processing speed is bottlenecked
Solution Approach 1:
The patent replaces the electrical domain mask function generation with an all-optical implementation. Specifically, it uses optical modulators to directly generate the mask function in the optical domain, eliminating the need for electrical signal processing and conversion. This substitution of electrical operations with optical operations resolves the speed bottleneck while maintaining the RC computing functionality.
Solution Approach 2:
The optical modulator serves multiple functions: it modulates the input signal, generates the mask function, and performs multiplication operations all within the optical domain. This multi-functionality eliminates the need for separate electrical processing stages, thereby improving speed while managing system complexity through functional integration.
2Ease of manufacture
If electrical domain processing is used for mask function generation, then implementation is straightforward, but processing time increases
Solution Approach 1:
The patent substitutes electrical domain processing with optical domain processing for mask function generation. By using optical modulators and optical signal processing techniques, the system eliminates the time-consuming electrical-to-optical conversion steps while maintaining implementation feasibility through standard optical communication components.
Solution Approach 2:
The mask function is generated in advance in the optical domain using pre-programmed optical modulators, rather than being computed in real-time in the electrical domain. This preliminary optical preparation of the mask function reduces the critical path processing time during actual RC computation.
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
This approach reduces processing time in the electric domain, enabling high-speed reservoir computing by generating and applying mask functions directly in the optical domain, thereby enhancing processing speed.
Implementation Method 1
a light source generating an optical signal
Implementation Method 2
first optical modulation means for modulating at least one of intensity and phase of the optical signal
Implementation Method 3
an optical circulation unit in which the modulated input signal circulates at a predetermined delay length
Implementation Method 4
a nonlinear response element giving nonlinearity to the optical signal circulating in the optical circulation unit
Implementation Method 5
optical multiplex means for joining the modulated input signal in the optical circulation unit
Implementation Method 6
optical branch means for branching part of the optical signal circulating in the optical circulation unit
Implementation Method 7
optical reception means for demodulating branched light output from the optical branch means to obtain an intermediate signal
Data Source
AI summary
There is provided an optical signal processing device that generates a mask function in an optical domain to enable high-speed RC processing. For light emitted from a laser light source, an optical modulator modulates at a modulation period at least one of the intensity and phase values of the optical electric field. Thereby, the light emitted from the laser light source becomes an input signal. The input signal is entered into an optical FIR filter unit. For the input signal, the term corresponding to the mask function is multiplied at the optical FIR filter unit and weighted. Thereby, the input signal is converted into an input signal modulated. The modulated input signal enters via an optical coupler, an optical circulation circuit which is loaded with a variable attenuator and a nonlinear response element. The circulating optical signal is branched into two by an optical coupler. One branched light is converted into an intermediate signal at an optical receiver. The intermediate signal is computed by a formula at an electric signal processing circuit, and thereby, the operation as RC can be performed.