Reconfigurable Optical Switch Using 2D Holographic Array
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Solution Overview
Problem
Current optical switches, particularly those using wavelength division multiplexed (WDM) signals, face limitations in data handling capacity and crosstalk, which affect their efficiency and resolution in routing optical signals effectively.
Innovation Solution
A reconfigurable optical switch design employing a spatial light modulator (SLM) with a 2D array of holograms, where sub-holograms steer demultiplexed beams in two dimensions, and a folded optical configuration with reflective or transmissive SLMs, along with relay optics and diffractive elements, to maintain resolution and reduce crosstalk, enabling adaptive data routing based on wavelength channel bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a spatial light modulator with a 2D array of holograms is used to increase data handling capacity, then the switching capacity and data rate are improved, but crosstalk between channels increases and resolution may be lost
Solution Approach 1:
The patent divides the optical switching function into multiple wavelength-specific sub-holograms arranged in a 2D array on the spatial light modulator. Each sub-hologram handles a specific wavelength channel, segmenting the overall switching task to reduce interference and crosstalk between channels while maintaining high data handling capacity through parallel processing of multiple wavelengths
Solution Approach 2:
The patent applies different holographic patterns to different regions of the spatial light modulator, with each region optimized for its specific wavelength channel. This local optimization allows each sub-hologram to maintain high resolution and minimal crosstalk for its designated wavelength while the overall system achieves high data handling capacity through the combined effect of all channels
2Measurement precision
If the optical outputs are positioned closer together to maintain resolution, then the resolution is maintained, but crosstalk between adjacent outputs increases
Solution Approach 1:
The patent transitions from traditional one-dimensional wavelength separation to a two-dimensional holographic array configuration. This dimensional change allows outputs to be positioned closer together in the spatial domain while maintaining resolution through the angular selectivity provided by the holographic diffraction patterns, effectively reducing crosstalk by utilizing the additional spatial dimension for signal separation
3Volume of moving object
If a folded optical configuration with reflective SLM is used to create a compact system, then the system size is reduced, but alignment precision and optical path stability become more difficult to maintain
Solution Approach 1:
The patent combines multiple optical functions into a single integrated folded configuration with the reflective spatial light modulator serving as both the switching element and a reference mirror. This merging of functions reduces the number of separate alignment-critical interfaces while maintaining compact size, as the reflective SLM provides a stable reference plane that simplifies the overall alignment requirements compared to separate transmissive components
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 design significantly enhances data handling capacity and reduces crosstalk, allowing for efficient routing of WDM signals by maintaining resolution and adapting to varying data rates, while also providing a compact and high-density optical signal processing system.
Implementation Method 1
a first diffractive element to disperse input beams from said set of arrays spatially along a first axis
Implementation Method 2
a spatial light modulator (SLM) with a 2D array of holograms, where sub-holograms steer demultiplexed beams in two dimensions
Implementation Method 3
a folded optical configuration with reflective or transmissive SLMs
Implementation Method 4
reflective or transmissive SLMs, along with relay optics and diffractive elements
Implementation Method 5
relay optics and diffractive elements, to maintain resolution and reduce crosstalk
Data Source
Figure 1a~1d
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AI summary
We describe a wavelength division multiplexed (WDM) reconfigurable optical switch, the switch comprising: a set of arrays of optical beam connections, each comprising an array of optical outputs and having an optical input to receive a WDM input optical signal; a first diffractive element to demultiplexed said WDM input optical signal into a plurality of demultiplexed optical input beams, and to disperse said demultiplexed optical input beams spatially along a first axis; first relay optics between said set of arrays of optical beam connections and said first diffractive element; and a reconfigurable holographic array comprising a 2D array of reconfigurable sub- holograms defining sub-hologram rows and columns; wherein said arrays of said set of arrays are at least one dimensional arrays extending spatially in a direction parallel to said first axis and arranged in a column defining a second axis orthogonal to said first axis; wherein said sub-hologram rows are aligned along said first axis, and wherein said sub-hologram columns are aligned along said second axis; wherein a number of said sub-hologram rows corresponds to a number of arrays in said set of arrays; and wherein each sub-hologram row is configured to receive a set of demultiplexed optical input beams at different carrier wavelengths demultiplexed from the optical input for the array of the set of arrays to which the row corresponds; wherein each of said sub- holograms in a sub-hologram row is reconfigurable to steer a respective wavelength channel of the WDM input signal for the array to which the sub-hologram row corresponds, towards a selected said optical output for the array; and wherein each said sub-hologram row is configured to steer the demultiplexed optical input beams for a respective array of the set of arrays of optical beam connections.