Optical Frequency Comb Wavelength Measurement Beyond Detector Bandwidth
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Solution Overview
Problem
The existing optical wavelength measurement technologies are limited by the bandwidth of photonic detectors, restricting the range of detectable wavelengths and hindering their application in fields like laser technology and optoelectronics.
Innovation Solution
The proposed solution involves an optical wavelength measurement apparatus that uses a wavelength multiplexing generation module to superimpose to-be-measured light with optical components from an optical frequency comb, converting the signals into electrical signals, and employing a signal processor to determine the wavelength based on beat frequency signals, thereby expanding the detectable wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a photonic detector is used to detect optical power changes, then the measurement process is simple, but the detectable wavelength range is limited due to bandwidth constraints
Solution Approach 1:
The optical frequency comb divides the broad optical spectrum into multiple discrete frequency components (comb lines). By segmenting the wavelength detection into multiple narrower bandwidth channels, each detectable by the photonic detector within its bandwidth limit, the system achieves broad overall wavelength coverage while maintaining measurement simplicity.
Solution Approach 2:
The optical frequency comb serves multiple functions: it acts as a reference spectrum, provides multiple frequency markers for wavelength determination, and enables detection across a broad wavelength range. This multi-functional component allows a single photonic detector to measure wavelengths that would otherwise require multiple specialized detectors.
2Adaptability or versatility
If the optical frequency comb is used to expand the detectable wavelength range, then more optical components are needed, but the patent reduces the number of optical paths
Solution Approach 1:
The patent combines multiple optical paths into a single integrated measurement path. The optical frequency comb and to-be-measured light are superimposed on the same optical path, and the photonic detector receives the combined signal. This merging approach expands the detectable wavelength range without requiring separate optical paths for each wavelength component.
Solution Approach 2:
The optical frequency comb acts as an intermediary that bridges the gap between the photonic detector's limited bandwidth and the broad wavelength range to be measured. By introducing the comb as a reference medium that interacts with the to-be-measured light, the system achieves extended wavelength detection capability without complicating the optical path structure.
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 allows for the detection of wider optical wavelength ranges, enabling broader applications in optical technologies and improving measurement accuracy by simplifying the calculation process and reducing the number of optical paths.
Implementation Method 1
a wavelength multiplexing generation module configured to respectively superimpose to-be-measured light with a plurality of optical components, to obtain a multiplexed optical signal
Implementation Method 2
a frequency value of the beat frequency signal in the multiplexed optical signal is detected
Implementation Method 3
a photonic detector configured to convert the multiplexed optical signal corresponding to each of the plurality of optical components into an electrical signal
Data Source
AI summary
An optical wavelength measurement apparatus and method may be used to expand a wavelength range that can be detected by using an optical wavelength measurement technology. The measurement apparatus may respectively superimpose to-be-measured light with optical components that are in an optical frequency comb and that correspond to each of a plurality of comb frequency values, to obtain a multiplexed optical signal corresponding to each optical component, and then determine a measured value of a wavelength of the to-be-measured light based on an electrical signal of a multiplexed optical signal corresponding to a target optical component obtained by an electrical beat frequency. The electrical signal corresponding to the target optical component includes a beat frequency signal.