WDM Signal Detector Using Grating Resonance
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Solution Overview
Problem
Existing WDM signal detection systems face challenges in being compact and efficient in optical power usage, with conventional methods either requiring large space for separate optical paths or wasting optical power due to the need for large WDM signal cross-sections and inefficient light utilization.
Innovation Solution
A WDM detector is designed with a stack of detector layers, each confining a different optical mode and incorporating a grating structure that couples resonant frequencies into a photodiode, causing destructive interference and enhancing detection efficiency while transmitting non-resonant light to lower layers, allowing for a compact and efficient detection of wavelength division multiplexed signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate optical paths with diffraction gratings are used to spatially separate frequency components, then detection accuracy is improved, but device size increases
Solution Approach 1:
The patent combines multiple frequency detection functions into a single integrated detector structure. Multiple detector elements are positioned at different locations within one detector, each coupled to a waveguide that receives light at different spatial positions. This allows simultaneous detection of multiple frequency components without requiring separate optical paths, thereby reducing device size while maintaining detection accuracy.
2Measurement precision
If an array of detectors with individual filters is used, then detection accuracy is improved, but optical power efficiency deteriorates
Solution Approach 1:
The patent creates a universal detector structure where a single detector array can detect multiple frequency components. Each detector element is designed to respond to a specific frequency range, and the waveguide structure directs different frequency components to appropriate detectors. This multi-functional approach eliminates the need for separate detectors for each frequency, allowing the system to efficiently utilize incident optical power across all detected frequencies without wasting light on unused detector areas.
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 a compact WDM detector that efficiently uses a high percentage of incident light, allowing for effective detection of different wavelength components at various depths, thereby improving detection efficiency and reducing the need for large beam cross-sections.
Implementation Method 1
The grating structure couples incident light having a resonant frequency into the optical mode and causes destructive interference to reduce or prevent transmission of light with the resonant frequency through the light detecting layer
Implementation Method 2
The light detecting layer has an optical mode that resonates in the light detecting layer
Implementation Method 3
The grating structure couples incident light having a resonant frequency into the optical mode and causes destructive interference to reduce or prevent transmission of light with the resonant frequency through the light detecting layer
Implementation Method 4
a detector includes a light detecting layer and a grating structure
Data Source
AI summary
A detector includes a light detecting layer and a grating structure. The light detecting layer, which can be a photodiode, has an optical mode that resonates in the light detecting layer, and the grating structure is positioned to interact with the optical mode. The grating structure further couples incident light having a resonant frequency into the optical mode, and causes destructive interference to prevent light having the resonant frequency from escaping the detecting layer. The light detecting layer can be made transparent to light having other frequencies, so that a stack of such detectors, each having a different resonant frequency, can be integrated into a WDM detector that is compact and efficient.