PIC Optical Wavemeter Using Dual MZI for Broad Range Measurement
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Solution Overview
Problem
Existing optical wavemeters are bulky, expensive, and have limited update rates and a short usable wavelength range, making them unsuitable for applications like optical communications, and they suffer from optical power losses when measuring low-power signals.
Innovation Solution
A photonic integrated circuit (PIC) optical wavemeter using two Mach-Zehnder Interferometers with different optical path lengths and effective indices of refraction, coupled with a controller to determine the wavelength of an optical signal by comparing difference signals, allowing for a wider wavelength range and improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If benchtop optical components are used for wavelength measurement, then measurement capability is achieved, but device size and cost increase significantly
Solution Approach 1:
The patent replaces bulk mechanical optical components with a photonic integrated circuit (PIC) that performs wavelength measurement functions on a miniaturized chip scale. The PIC integrates waveguides, interferometers, and detectors into a single compact substrate, eliminating the need for separate benchtop optical components while maintaining measurement capability.
Solution Approach 2:
The patent combines multiple optical functions (wave guiding, interference, detection) into a single integrated photonic circuit chip. The PIC merges the functions of multiple discrete optical components into one unified device, achieving both size reduction and functional integration.
2Adaptability or versatility
If single MZI design is used, then device simplicity is maintained, but usable wavelength range is limited
Solution Approach 1:
The patent divides the wavelength measurement function into multiple independent MZI units, each optimized for specific wavelength ranges. By segmenting the measurement function across multiple interferometers with different path length differences, the system achieves broad wavelength coverage while keeping each individual MZI relatively simple.
Solution Approach 2:
The patent designs the PIC to perform multiple wavelength measurement functions simultaneously using different MZI configurations. Each MZI can measure different wavelength ranges, making the overall device universal and adaptable to various applications including optical communications bands.
3Measurement precision
If long waveguide paths are used, then wavelength measurement resolution is improved, but optical power losses increase
Solution Approach 1:
The patent replaces long physical waveguide paths with an integrated photonic circuit design that achieves equivalent measurement resolution through optimized on-chip waveguide geometries. The PIC structure allows for precise control of optical paths while minimizing propagation losses through integrated fabrication and shorter effective paths.
Solution Approach 2:
The patent changes the effective index of refraction parameters of the waveguides to achieve different optical path lengths without proportionally increasing physical length. By adjusting waveguide dimensions and materials, the system achieves the required optical path differences for high-resolution measurement while keeping physical dimensions compact and power losses low.
4Measurement precision
If bulk optical components are used, then measurement functionality is achieved, but update rate is limited
Solution Approach 1:
The patent replaces slow bulk optical measurement systems with a photonic integrated circuit that enables high-speed wavelength measurement. The PIC architecture allows for rapid data acquisition and processing, achieving update rates suitable for dynamic applications like optical communications monitoring.
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 PIC optical wavemeter provides a more compact, cost-effective, and stable solution with enhanced wavelength measurement capabilities and reduced power losses, suitable for applications like optical communications, and improved accuracy across a broader wavelength range.
Implementation Method 1
two Mach-Zehnder interferometers...configured to receive first and second output optical signals from the optical source
Data Source
AI summary
A photonic integrated circuit (PIC) for determining a wavelength of an input signal is disclosed. The PIC comprises: a substrate; a first Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising first optical waveguides having a first optical path length difference, and configured to receive a first output optical signal from a light source. The PIC also comprises a second Mach-Zehnder Interferometer (MZI) disposed over the substrate, comprising second optical waveguides having a second optical path length difference, which is greater than the first optical path length difference, and configured to receive a second output optical signal from the light source.