Spectrally Adjustable Filter Using Tilted Reflective Surface
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Solution Overview
Problem
Current spectrally adjustable filtering devices in optical communication systems lack efficient methods for dynamically filtering and monitoring spectral components, leading to limitations in transmission performance, bandwidth utilization, and spectral resolution.
Innovation Solution
The apparatus and method utilize a spectrally dispersive element, optical elements to change propagation axes, and a reflective surface that tilts to select specific spectral components, allowing for precise direction and retroreflection of dispersed spectral components, enabling efficient filtering and monitoring with improved spectral resolution and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple tuning elements are used to receive spectrally dispersed components from different input beams, then the filtering capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple dispersed spectral components from different input beams onto a single reflective surface, allowing one tuning element to perform the function of multiple elements. This merging approach maintains the filtering capability for multiple beams while reducing device complexity and cost.
Solution Approach 2:
The single reflective surface is designed to receive and tune spectral components from multiple different input beams simultaneously, making it a universal element that performs the tuning function for all beams rather than requiring separate dedicated elements for each beam.
2Measurement precision
If the transverse spatial extent of the input beam on the spectrally dispersive element is made larger, then the spectral resolution is improved, but the transverse spatial extent of the dispersed spectral components on the reflective surface increases
Solution Approach 1:
The patent uses optical elements to change the angles of propagation axes of the dispersed spectral components, effectively manipulating their spatial distribution in angular space. This allows the system to achieve high spectral resolution through large beam size on the dispersive element while controlling the spatial extent on the reflective surface through angular redirection.
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 precise control and stability in filtering, enhances spectral resolution, and reduces costs by using a single tuning element, allowing for more efficient and accurate spectral adjustment and monitoring in optical communication systems.
Implementation Method 1
a spectrally dispersive element configured to disperse spectral components of at least one input beam at respective angles in a spectral plane
Implementation Method 2
a reflective surface configured to receive a plurality of the dispersed spectral components, and to tilt to select at least one and fewer than all of the received spectral components to be directed to an output spatial mode
Data Source
AI summary
Spectrally filtering at least one input beam includes: dispersing spectral components of at least one input beam at respective angles in a spectral plane; changing at least some of the angles of the propagation axes of the dispersed spectral components so that a plurality of the spectral components reflect from a single reflective surface; and tilting the reflective surface to select at least one and fewer than all of the received spectral components to be directed to an output spatial mode.