CTE-Matched Lasercom Optical Bench for Thermal Stability
Solution Overview
Problem
Current wireless radio communication technologies face challenges such as signal dispersion, interference, and security issues due to geographic overlap and the need for frequency band assignment, which are not present in laser communication but are complicated by the need for precise alignment and stability in satellite lasercom applications.
Innovation Solution
A compact lasercom optical bench device with thermal-expansion-matched optics and an embedded star-tracker capability, including a transmitter fiber collimator, tiltball, point-ahead mechanism, and fast-steering mirror, designed for cost-effective alignment and stability in space environments, with a strongback for structural support and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traditional wireless radio communication is used, then communication coverage and geographic range are improved, but signal attenuation and security vulnerabilities increase with distance
Solution Approach 1:
The patent replaces radio frequency electromagnetic wave transmission with laser optical transmission. This substitution fundamentally changes the communication medium from RF waves that disperse broadly to laser beams that maintain directional concentration, thereby achieving both long-range coverage and high signal integrity simultaneously
Solution Approach 2:
The patent changes the fundamental parameter of transmission medium from radio frequency to optical frequency. This parameter change enables the system to achieve narrow beam divergence and high directionality, resolving the contradiction between coverage area and signal reliability
2Reliability
If laser communication is used, then communication security and signal directionality are improved, but alignment precision requirements and system complexity increase
Solution Approach 1:
The patent merges the alignment mechanism with the optical bench structure itself. The optical bench is designed with integrated mounting features and alignment references that are built into the structural framework, eliminating the need for separate alignment devices and reducing overall system complexity
Solution Approach 2:
The optical bench structure provides self-alignment capabilities through its inherent mechanical design. The integrated mounting features and reference marks enable the system to self-correct and maintain alignment without requiring complex external alignment mechanisms
3Stability of the object's composition
If precise alignment mechanisms are added to lasercom, then alignment stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the alignment function with the optical bench structure by integrating mounting features and alignment references directly into the bench framework. This merging eliminates the need for separate alignment mechanisms while maintaining alignment stability
Solution Approach 2:
The optical bench structure serves multiple functions simultaneously: it provides mechanical support, thermal management, vibration isolation, and alignment reference. This multi-functionality reduces the need for additional specialized components, thereby reducing complexity while maintaining stability
4Ease of manufacture
If thermal expansion mismatch occurs in optical components, then manufacturing ease is improved, but thermal stability and alignment precision deteriorate
Solution Approach 1:
The patent applies thermal expansion principles by selecting materials with matched coefficients of thermal expansion for the optical bench and its mounted components. This material selection ensures that all components expand and contract uniformly with temperature changes, maintaining alignment precision across varying thermal conditions
Solution Approach 2:
The patent employs composite material selection strategy, combining materials with complementary thermal properties. The optical bench uses a composite structure that integrates materials specifically chosen for their thermal expansion matching characteristics, ensuring thermal stability while remaining manufacturable
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
Enables robust, high-speed, secure laser communication with reduced interference and alignment challenges, providing ultra-stable thermal performance and immunity to launch loads, suitable for satellite communications with high reliability and low probability of intercept and detection.
Implementation Method 1
thermal-expansion-matched optics and structure
Implementation Method 2
providing a diffraction-limited Gaussian beam from a fiber
Implementation Method 3
transmitter fiber collimator providing a diffraction-limited Gaussian beam
Data Source
AI summary
A lasercom coefficient of thermal expansion (CTE)-matched optical bench, with optional star-tracker capability, that includes a Transmitter (TX) fiber collimator creating a Gaussian beam from a singlemode (SM) or polarization maintaining (PM) fiber; a tiltball directly bonded to the optical bench, the tiltball performing centration of a TX beam with a telescope optical axis; a TX beam diverger creating a wide beam for acquisition, and a narrow beam for tracking and communications; a Point-Ahead Mechanism/mirror; a polarization diplexer cube or dichroic filter(s) separating TX and Receiver (RX) beams of opposite polarization and/or different wavelengths, wherein the polarization or dichroic and anti-reflective coatings are compatible with the adjunct star tracker; a fast-steering mechanism and mirror having a common-path to TX and RX; a RX optical passband filter; the RX optical passband filter having a flipper mechanism allowing for selecting the passband of the star-tracker or the RX passband.