Wavelength-Splitting Component for Multiplexing and Demultiplexing
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Solution Overview
Problem
Current wavelength division multiplexing systems in integrated photonic devices face challenges with bulky and expensive optical circulators, poor signal-to-noise ratios due to spurious reflections, and difficulties in manufacturing identical arrayed waveguide gratings for transmission-mode sensor read-outs, which affect the accuracy and efficiency of optical signal processing.
Innovation Solution
A single wavelength-splitting/combining component is used for both de-multiplexing and multiplexing optical signals, eliminating the need for separate components and allowing for more lenient production accuracy, while also simplifying calibration and reducing the size of the integrated photonic device by using a single component for both functions, which includes output and response channels connected to different ports to prevent signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wavelength-splitting/combining component is used for both de-multiplexing and multiplexing, then device complexity and manufacturing difficulty are reduced, but signal interference between output and response channels may occur
Solution Approach 1:
The patent resolves signal interference by transitioning from a single-port configuration to a multi-port configuration. The wavelength-splitting/combining component is designed with multiple input ports and multiple output ports, where the output channel and response channel are connected to different ports. This spatial separation in the port dimension prevents signal interference while maintaining the benefit of using a single component for both de-multiplexing and multiplexing functions.
2Reliability
If optical circulators are used to separate light traveling from AWG to sensors and from sensors to AWG, then signal direction is controlled, but device size and cost increase
Solution Approach 1:
The patent merges the functions of optical circulators into the wavelength-splitting/combining component itself. By designing the component with multiple ports that inherently provide directional signal routing, the separate optical circulator components become unnecessary. This integration eliminates the bulky circulator components while maintaining signal direction control through the port configuration of the wavelength-splitting/combining component.
3Measurement precision
If two identical AWGs are manufactured for transmission-mode sensor read-out, then signal separation accuracy is improved, but manufacturing precision requirements become extremely difficult to meet
Solution Approach 1:
The patent applies universality by designing a single wavelength-splitting/combining component that performs both de-multiplexing and multiplexing functions. This eliminates the need to manufacture two separate identical AWGs with precisely matching wavelength channels. The single component inherently provides consistent wavelength routing for both functions, thereby maintaining wavelength channel alignment accuracy while dramatically reducing manufacturing precision 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
This approach enables a compact, efficient, and cost-effective integrated photonic device that maintains high signal-to-noise ratios without the need for optical circulators, allowing for reliable and accurate processing of optical signals in applications such as sensor read-outs and LIDAR systems.
Implementation Method 1
Wavelength division multiplexing (WDM) allows multiplexing different signals while maintaining integrity of the signals. Using WDM, optical signals for interrogating an array of sensors may be transmitted through a single optical fiber and the response from the array of sensors may also be transmitted back through a single optical fiber.
Implementation Method 2
Optical signals are useful for carrying information. For instance, sensors may be read out using optical signals. In many applications it is undesirable to have electronic connections to sensors and therefore optical signals are advantageously used for carrying information from the sensors.
Data Source
AI summary
An integrated photonic device for wavelength division multiplexing comprises: a wavelength-splitting/combining component configured to be re-used for both splitting a single signal to be split, wherein the signal to be split comprises plural wavelengths, to plural split signals, wherein each of the plural split signals is related to a unique wavelength band, and combining plural signals to be combined, wherein each of the plural signals to be combined is related to a unique wavelength band, to a single combined signal, wherein the wavelength-splitting/combining component comprises at least one output channel for providing an output signal and at least one response channel for receiving a response input signal from a light interaction induced by the output signal, wherein the output channel and the response channel are connected to different ports of the wavelength-splitting/combining component.