Compact Tunable Optical Time Delay Mechanism
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Solution Overview
Problem
Tunable optical time delays in optical signal processing devices face challenges due to the need for ultra-precision and bulky components to maintain optical alignment, making them expensive and difficult to install and operate.
Innovation Solution
A compact optical time delay design combining an optical subassembly with a precision optical ferrule and split sleeve for stable alignment, and a mechanical subassembly with a screw and sliding barrel for adjustable delay, allowing for true time delay without requiring precise alignment of optical and mechanical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultra-precision mechanical components are used to maintain optical alignment, then optical alignment precision is improved, but device complexity and cost increase
Solution Approach 1:
The device is divided into two independent subassemblies: an optical subassembly containing optical components (collimator, reflector, optical ferrule) and a mechanical subassembly containing the micrometer stage and screw mechanism. This segmentation allows each subassembly to be optimized independently - the optical subassembly maintains alignment through its own precision ferrule and split sleeve, while the mechanical subassembly provides tuning capability without needing ultra-precision components.
Solution Approach 2:
A precision optical ferrule with split sleeve acts as an intermediary between the mechanical tuning mechanism and the optical components. The ferrule maintains precise optical alignment through its own internal precision features while being driven by the simpler mechanical subassembly, effectively decoupling the alignment precision requirements from the mechanical component specifications.
2Manufacturing precision
If ultra-precision mechanical components are used to maintain optical alignment, then optical alignment precision is improved, but device size increases
Solution Approach 1:
By separating optical and mechanical functions into independent subassemblies, the device achieves compact dimensions. The optical subassembly maintains alignment precision through its compact ferrule and split sleeve design, while the mechanical subassembly uses a simple micrometer stage that does not require bulky ultra-precision components, resulting in an overall compact device volume.
3Device complexity
If simple mechanical components are used for tuning, then device complexity is reduced, but optical alignment precision deteriorates
Solution Approach 1:
The precision optical ferrule with split sleeve serves as a mediator that preserves optical alignment precision despite the use of simple mechanical components. The ferrule's internal precision features maintain alignment while being driven by the simpler micrometer stage, effectively decoupling alignment precision from mechanical component sophistication.
Solution Approach 2:
The optical subassembly is designed to maintain its own alignment precision through self-contained precision features (ferrule and split sleeve) without relying on ultra-precision mechanical components. The alignment maintenance function is self-service within the optical subassembly, independent of the mechanical subassembly's precision level.
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 provides a cost-effective, compact, and efficient solution for tunable optical time delay, maintaining precise optical alignment while allowing for adjustable delay times without the need for high-precision mechanical components, facilitating easier assembly and operation.
Implementation Method 1
an input beam of light propagates certain distance in space along the optical axis, in accordance with the time duration it's delayed
Implementation Method 2
The reflector helps direct the beam towards designated output port
Implementation Method 3
when the screw is rotated relative to the barrel, the existence of the pin and position clamp forces the barrel to undergo linear motion along the mechanical axis which squeezes or extracts the optical path length and hence the delay time
Data Source
AI summary
A compact tunable optical true time delay consists of an optical subassembly to apply dispersion-free time delay to the input optical signal, and a mechanical subassembly to facilitate tuning the delay using a linear actuator. The deployment of a precision optical ferrule sliding in a precision split sleeve offers a self-contained and inexpensive method to minimize optical misalignment during the tuning process, which releases the burden of the mechanical subassembly and is also advantageous in keeping the device compact. The exterior dimension remains unchanged at any moment despite the interior motion. Both reflection-type and transmission-type optical time delays are introduced, driven either manually or electrically.