Photonic Bandgap Phase Modulator for Compact Optical Computing
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Solution Overview
Problem
Existing optical modulators, such as those based on Mach-Zehnder interferometers and microresonators, face challenges with large device area, high insertion loss, and high power consumption, as well as variability due to fabrication tolerances and temperature changes.
Innovation Solution
A photonic bandgap phase modulator and optical filter bank system that utilizes photonic crystal-based phase modulators to efficiently modulate optical signals with reduced dimensions and minimal impact on other channels, implemented in a photonic computing system with integrated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mach-Zehnder interferometer-based modulators are used, then sufficient modulation can be achieved, but large device area is required
Solution Approach 1:
The patent changes the fundamental operating parameter from interference-based modulation to photonic bandgap-based modulation. The photonic crystal waveguide utilizes the photonic bandgap effect where the refractive index contrast creates forbidden frequency ranges for light propagation, enabling compact phase modulation without requiring the long interaction lengths of MZI structures.
2Reliability
If Mach-Zehnder interferometer-based modulators are used, then sufficient modulation can be achieved, but high insertion loss occurs
Solution Approach 1:
The invention transitions from lossy interference-based modulation to low-loss photonic bandgap modulation. The photonic crystal structure confines light tightly within the waveguide core through the bandgap effect, minimizing radiation losses and scattering that plague conventional MZI modulators.
3Area of stationary object
If microresonator-based modulators are used, then compact size can be achieved, but variance from fabrication tolerances and temperature changes occurs
Solution Approach 1:
The patent changes the resonance mechanism from microresonator quality factor resonance to photonic bandgap frequency filtering. The photonic crystal waveguide's bandgap structure provides inherently stable frequency selectivity that is less sensitive to dimensional variations and thermal expansion compared to microresonator modes.
4Area of stationary object
If microresonator-based modulators are used, then compact size can be achieved, but high power consumption occurs
Solution Approach 1:
The invention transitions from high-power microresonator pumping to low-power photonic bandgap modulation. The photonic crystal structure enables strong light-matter interaction through evanescent field coupling and bandgap confinement, achieving effective modulation with lower optical and electrical power requirements.
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 achieves efficient phase modulation with reduced modulator dimensions, lower power consumption, and improved stability against environmental variations, enabling precise control of optical signals with minimal interference.
Implementation Method 1
A photonic bandgap phase modulator and optical filter bank system that utilizes photonic crystal-based phase modulators to efficiently modulate optical signals
Data Source
AI summary
A photonic computing system, preferably including an input module, a computation module, and/or control module. The photonic computing system can include one or more optical filter banks, such as in the computation module and/or any other suitable modules. Each optical filter bank preferably includes a plurality of photonic bandgap phase modulators. Each photonic bandgap phase modulator preferably includes a set of photonic crystal segments. The photonic crystal segments can preferably be controlled to transition light propagation between two or more photonic bands.