Multicast Optical Switch Using Diffractive Bulk Elements
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Solution Overview
Problem
Existing multicast optical switches are complex and suffer from high optical losses and crosstalk due to the large number of waveguide crossovers, which complicates assembly and increases the size of the device.
Innovation Solution
The use of freely propagating optical beams in a bulk optical medium, such as vacuum or glass, to create crossovers, with diffractive bulk optical elements for beam splitting, eliminating the need for waveguide crossovers and reducing crosstalk, allowing for a more scalable and compact multicast optical switch design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If waveguide crossovers are used in PLC multicast optical switches, then the device can be integrated on a single substrate, but the number of waveguide crossovers increases causing high optical losses and crosstalk
Solution Approach 1:
The patent replaces the waveguide-based optical switching mechanism with a bulk optical system using freely propagating optical beams. Instead of confining light in waveguides that require complex crossovers, the invention uses bulk optical elements (lenses, mirrors) to direct and route beams in three-dimensional space, eliminating the need for waveguide crossovers and their associated losses
Solution Approach 2:
The invention transitions from two-dimensional waveguide integration to three-dimensional bulk optical processing. By using freely propagating beams in bulk optical media and arranging optical elements in three-dimensional space, the system achieves routing flexibility without the constraints of planar waveguide crossovers, thereby reducing optical losses and crosstalk
2Ease of manufacture
If waveguide crossovers are used in PLC multicast optical switches, then the device can be integrated on a single substrate, but the device size and complexity increase
Solution Approach 1:
The patent replaces the waveguide-based optical switching mechanism with a bulk optical system using freely propagating optical beams. Instead of confining light in waveguides that require complex crossovers, the invention uses bulk optical elements (lenses, mirrors) to direct and route beams in three-dimensional space, eliminating the need for waveguide crossovers and their associated losses
Solution Approach 2:
The invention transitions from two-dimensional waveguide integration to three-dimensional bulk optical processing. By using freely propagating beams in bulk optical media and arranging optical elements in three-dimensional space, the system achieves routing flexibility without the constraints of planar waveguide crossovers, thereby reducing optical losses and crosstalk
3Ease of manufacture
If separate splitter and switch components are used, then the device can be assembled with standard components, but the assembly complexity and optical losses increase
Solution Approach 1:
The patent merges the functions of optical splitting and switching into a single integrated bulk optical system. By combining multiple optical elements (lenses, mirrors, diffractive elements) into a unified configuration that processes all signals simultaneously in bulk, the system eliminates the need for separate splitter and switch components, thereby reducing assembly complexity and optical losses
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 significantly reduces optical losses and crosstalk, enabling a more compact and efficient multicast optical switch with increased scalability, as optical beams can freely cross without introducing mutual loss, and the number of crossover connections can be greatly increased.
Implementation Method 1
a diffractive bulk optical element coupled to the first input port, for splitting the first optical beam impinging on the diffractive bulk optical element into first and second beam portions propagating in a bulk optical medium
Implementation Method 2
optical beams freely propagating in a bulk optical medium, such as vacuum, air, glass, etc.
Implementation Method 3
first and second directors for receiving the first and second portions, respectively, of the first optical beam
Data Source
AI summary
A multicast optical switch uses a diffractive bulk optical element, which splits at least one input optical beam into sub-beams, which freely propagate in a medium towards an array of directors, such as MEMS switches, for directing the sub-beams to output ports. Freely propagating optical beams can cross each other without introducing mutual optical loss. The amount of crosstalk is limited by scattering in the optical medium, which can be made virtually non-existent. Therefore, the number of the crossover connections, and consequently the number of inputs and outputs of a multicast optical switch, can be increased substantially without a loss or a crosstalk penalty.