Programmable Optical Array for Dynamic Signal Filtering
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Solution Overview
Problem
Current optical signal processing technologies lack programmable arrays that can efficiently manipulate the phase and amplitude of optical signals, limiting their ability to implement complex filtering and signal processing functionalities.
Innovation Solution
A programmable optical array is developed, comprising a grid of optical waveguides with programmable coupling elements that allow for the control of waveguide and ring connections, enabling the implementation of various filtering and signal processing functions, similar to electronic Field-Programmable Gate Arrays (FPGAs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed optical filter design is used, then the filter structure is simple and easy to manufacture, but the adaptability to different signal processing needs is poor
Solution Approach 1:
The patent implements dynamically controllable coupling elements between waveguides and optical rings, as well as between adjacent waveguides. These coupling elements can be programmatically adjusted to change the filter characteristics, enabling the same physical structure to adapt to different signal processing requirements. This dynamic control mechanism allows the system to transition between different filtering configurations without physical reconfiguration.
Solution Approach 2:
The patent creates a universal optical filtering platform where a single array structure can implement multiple filter types (band-pass, notch, low-pass, high-pass) and various filter orders. By programmatically controlling the coupling elements, the same hardware infrastructure serves multiple functions, eliminating the need for separate fixed filters for each application scenario.
2Adaptability or versatility
If programmable coupling elements are added to enable reconfiguration, then the adaptability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the optical filtering function into discrete, independently controllable segments. Each coupling element between waveguides and rings, and each inter-waveguide coupling, can be individually programmed. This segmentation allows for modular control where each element can be manufactured using standard processes and then configured through software, separating the manufacturing complexity from the operational flexibility.
Solution Approach 2:
The patent utilizes controllable parameters of the coupling elements (such as coupling strength or phase) that can be adjusted after manufacturing. By changing these parameters programmatically, the system achieves reconfigurability without requiring multiple physical manufacturing variants. The underlying structure remains fixed and manufacturable, while the functional characteristics are tuned through parameter adjustment.
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 solution provides a powerful tool for processing broadband optical signals by allowing dynamic programming of filter shapes and characteristics, enabling the creation of complex filters like Butterworth, Elliptic, and Chebychev filters, as well as low pass, high pass, and notch filters, with tunable center frequency and bandwidth, and the ability to cascade or connect filters in parallel to meet specific needs.
Implementation Method 1
A plurality of programmable coupling elements controllably couple selected ones of the waveguides together. Another plurality of programmable coupling elements controllably couple selected ones of the optical rings to selected ones of the waveguides.
Implementation Method 2
There are single individual optical filters built on monolithic platforms which are used for optical signal processing, such as band pass or notch filtering.
Implementation Method 3
The programmable array comprises a plurality of optical waveguides forming a rectangular grid of cells.
Data Source
AI summary
An apparatus having a topology that allows building complicated optical programmable arrays useful for manipulating the phase and/or amplitude of an optical signal. Sophisticated filtering and other optical signal processing functionality can be programmed into the array after a chip containing the array has been fabricated. This programming capability is analogous to that of electronic field programmable gate arrays (FPGA's). Apparatus described herein will provide a powerful tool for processing optical signals or very broadband electrical signals.