Integrated Interferometer and Spectral Filter for Lab-on-Chip Sensing
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Solution Overview
Problem
Current integrated photonics sensors require expensive and bulky tunable lasers or optical spectrum analyzers for wavelength interrogation, limiting their use in compact and portable lab-on-a-chip devices and suffering from power budget constraints, especially in multiplexed configurations.
Innovation Solution
A photonics integrated system with a Mach-Zehnder interferometer and an arrayed waveguide grating spectral filter, where the interferometer period is smaller than the spectral filter bandwidth, allowing optimal use of the power budget and enabling parallel read-out of multiple channels, thus eliminating the need for expensive readout equipment and improving detection limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tunable laser or optical spectrum analyser is used for wavelength interrogation, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the spectral filtering function from external equipment (OSA) and integrates it directly into the photonic chip using an arrayed waveguide grating. This allows wavelength interrogation to be performed on-chip, eliminating the need for external OSA equipment while maintaining measurement precision.
Solution Approach 2:
The patent uses an arrayed waveguide grating to create multiple copies of the sensor signal at different wavelength channels. Each waveguide in the AWG acts as a channel that copies and spatially separates spectral information, enabling parallel readout without requiring expensive tunable lasers or OSAs.
2Ease of manufacture
If a Vernier-cascade sensor with AWG spectral filter is used, then cost is reduced, but optical power budget is limited
Solution Approach 1:
The patent optimizes the coupling between the sensor ring resonator and the AWG spectral filter by dynamically adjusting design parameters such as the free spectral range matching and waveguide coupling dimensions. This maximizes power transfer efficiency from the broadband source through the resonator to the AWG channels.
Solution Approach 2:
The patent changes key design parameters including the AWG channel spacing, free spectral range of the resonator, and waveguide dimensions to optimize power distribution. By carefully selecting these parameters, the system achieves both cost reduction through integration and improved optical power budget through efficient spectral utilization.
3Productivity
If multiple sensors are multiplexed, then productivity is improved, but optical power budget is insufficient
Solution Approach 1:
The patent transitions from temporal multiplexing (sequential measurement) to spatial multiplexing (parallel measurement) by using the AWG to spatially separate signals from multiple sensors into different wavelength channels. This allows simultaneous detection of multiple sensors, dramatically improving productivity while distributing optical power across multiple channels.
Solution Approach 2:
The arrayed waveguide grating serves multiple functions simultaneously: it acts as a spectral filter, a demultiplexer for multiple sensors, and a spatial separator for parallel detection. This multi-functionality enables high-level sensor multiplexing with a single broadband light source, resolving the power budget constraint.
4Ease of operation
If a compact and portable lab-on-a-chip device is developed, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent merges the sensor ring resonator, the AWG spectral filter, and the detection functionality into a single integrated photonic chip. This consolidation eliminates the need for external bulky equipment like OSAs and tunable lasers, achieving portability while maintaining measurement precision through on-chip spectral analysis.
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 configuration achieves high sensitivity and accurate detection comparable to ring resonators without the need for costly tunable sources, enabling efficient and portable lab-on-chip systems with improved detection limits and faster measurement capabilities.
Implementation Method 1
an integrated interferometer integrated in the substrate and being configured for receiving radiation from a radiation source
Implementation Method 2
an integrated spectral filter integrated in the substrate and being configured for receiving radiation from the interferometer, wherein the integrated spectral filter has a periodic transfer characteristic
Data Source
Figure 1(a)~1(b)
Figure 2(a)~3
Figure 4
AI summary
A photonics integrated system (100) is disclosed, comprising a substrate (110), an integrated interferometer (130) integrated in the substrate (100) and being configured for receiving radiation from a radiation source, and an integrated spectral filter (140) integrated in the substrate (100) and being configured for receiving radiation from the interferometer (130). The integrated interferometer (130) has a period (Pii) and the integrated spectral filter (140) has a bandwidth (BWsa) such that the period (Pii) of the integrated interferometer (130) is smaller than the bandwidth (BWsa) of the integrated spectral filter (140). The integrated spectral filter (140) has a periodic transfer characteristic with a period (Psa) and the system has a bandwidth (BWsystem) such that the period (Psa) of the periodic transfer characteristic of the integrated spectral filter (140) is larger than the bandwidth (BWsystem) of the system (100).