Hybrid Pulsed Laser Source With All-Optical Triggering Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing neuromorphic photonic systems face drawbacks such as the need for multiple optoelectronic devices for pulse reversal and strict wavelength control in all-optical spiking photonic neurons, and additional losses and complexity in O/E/O type spiking photonic neurons due to O/E conversion, which affect bandwidth and power efficiency.
Innovation Solution
A pulsed laser device with a hybrid III-V-on-silicon technology featuring a semiconductor medium with quantum wells, an optical cavity, and control optical devices that include excitation and inhibition lateral waveguides for all-optical triggering, eliminating the need for photodiodes and optimizing performance by adjusting waveguide dimensions for enhanced confinement factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If O/E/O conversion is used in spiking photonic neurons, then electrical control is achieved, but additional losses occur which reduce bandwidth and power efficiency
Solution Approach 1:
The patent introduces an optical intermediary (optical pulse) that directly modulates the laser source without electrical conversion. The optical pulse from the first laser source directly triggers the second laser source, eliminating the need for photodiodes and O/E/O conversion, thus reducing optical power loss while maintaining control capability
Solution Approach 2:
The patent replaces the electrical control mechanism (photodiodes and electrical signals) with an optical control mechanism. Optical pulses directly modulate the laser sources, substituting the mechanical/electrical conversion system with a purely optical system that avoids additional losses
2Ease of operation
If photodiodes are used for triggering control, then electrical triggering is achieved, but device complexity increases and surface density decreases
Solution Approach 1:
The patent uses optical pulses as intermediaries that directly trigger the laser sources without requiring photodiodes or complex electrical triggering circuits. The optical pulse from the first laser source serves as the trigger for the second laser source, simplifying the overall device structure
Solution Approach 2:
The patent extracts and removes the photodiodes and electrical triggering circuits from the system. By using direct optical triggering between laser sources, the complex electrical control components are eliminated, reducing device complexity and increasing surface density
3Ease of operation
If excitation optical pulses are reversed for neuron excitation, then proper excitation is achieved, but multiple optoelectronic devices are required
Solution Approach 1:
Instead of reversing the excitation optical pulses as in conventional systems, the patent inverts the approach by using the optical pulse directly without reversal. The optical pulse from the first laser source directly triggers the second laser source in its original form, eliminating the need for reversal devices
Solution Approach 2:
The patent merges the excitation and triggering functions into a single direct optical interaction. The optical pulse from the first laser source serves both as the excitation signal and the trigger for the second laser source, eliminating the need for separate optoelectronic reversal devices
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 solution enables efficient all-optical triggering with improved performance by replicating physiological neuron excitability and refractory periods, reducing optical mode overlap, and optimizing emission and inhibition efficiencies, thus overcoming previous system limitations.
Implementation Method 1
a pulsed laser source of the hybrid type made according to III-V-on-silicon technology and including a semiconductor medium with quantum wells made from a III-V compound, located in an optical cavity
Implementation Method 2
including at least one gain section and at least one saturable absorber section
Implementation Method 3
The control optical device includes: at least one emitter source adapted to emit at least one control optical pulse with a predefined intensity; and at least one lateral waveguide
Data Source
AI summary
A pulsed laser device including: a III-V-on-silicon type hybrid pulsed laser source, including a gain section and a saturable absorber section which rest on a photonic substrate, and a longitudinal waveguide located in the photonic substrate; a control optical device including an optical pulse emitter source and a lateral waveguide located in the photonic substrate; the waveguides being sized so that the confinement factor Γlae/SA, Γlai/G in the quantum wells of the corresponding section of the optical mode of the lateral waveguide is higher than the confinement factor IL/ms, in the quantum wells of the semiconductor medium, of the optical mode of the longitudinal waveguide.