Monolithic Prism Wavelength Separation for FDD Optical Links
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Solution Overview
Problem
Current free-space optical communication systems face challenges in efficiently managing multiple wavelengths of light for data connectivity, particularly in frequency-division duplex (FDD) communications, where distinct wavelengths are used for data transmission and reception, and existing solutions are complex and costly to manufacture.
Innovation Solution
A monolithic optical device with dichroic and reflective surfaces, formed by assembling prisms with specific coatings and surface treatments, separates and directs different wavelengths of light through a common aperture, allowing for efficient wavelength-dependent optical paths and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple prisms are assembled together with coatings and films on mating surfaces to form a monolithic optical device, then wavelength separation and optical path definition are improved, but manufacturing complexity and alignment precision requirements increase
Solution Approach 1:
Multiple separate prisms are assembled together with their mating surfaces joined to form a single monolithic optical device. The dichroic surfaces are created by applying coatings or films to the mating surfaces of the prisms, merging the functional elements into an integrated structure that maintains wavelength separation while reducing the number of external components needed.
Solution Approach 2:
Dichroic coatings or films are applied to the mating surfaces of the prisms to create dichroic surfaces that act as intermediaries for wavelength-dependent light transmission. These intermediate layers enable selective transmission and reflection of different wavelengths at the prism interfaces, achieving wavelength separation without requiring complex external filtering mechanisms.
2Adaptability or versatility
If a beam splitting apparatus is used to separate multiple wavelengths in a communication terminal, then wavelength-dependent optical path management is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The monolithic optical device serves multiple functions within a single integrated structure: it acts as a beam splitter, wavelength separator, and optical path director simultaneously. The same dichroic surfaces that separate wavelengths also define the optical paths for transmitted and reflected beams, eliminating the need for separate components for each function and reducing overall device complexity.
Solution Approach 2:
The beam splitting apparatus is segmented into multiple prisms with dichroic surfaces at their mating interfaces. Each prism segment handles specific wavelength ranges or optical path directions, allowing the complex beam splitting function to be divided into simpler, modular segments that are easier to manufacture and align individually while maintaining overall system functionality when assembled.
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 solution enables robust and cost-effective management of multiple wavelengths in free-space optical communication systems, enhancing performance and reliability while minimizing the impact of misalignment and operational complexity.
Implementation Method 1
If the dichroic film or coating forms a long-pass dichroic surface, photons having wavelengths greater than a threshold wavelength pass through the dichroic surface, while photons having wavelength shorter than the threshold wavelength are reflected
Implementation Method 2
reflecting other photons back into prism X
Data Source
AI summary
An example beam splitting apparatus is assembled from multiple prisms that are assembled together along respective mating surfaces to form a single monolithic optical device. The beam splitting apparatus includes optical features, such as dichroic and reflective surfaces, that define optical paths for light that enters the beam splitting apparatus. The optical features allow photons in the light to be directed along different optical paths based on their wavelengths. The optical features in the beam splitting apparatus are provided by coatings, films, and/or surface treatments applied to any of the faces of the prisms. In particular, coatings, films, and/or surface treatments are applied to the mating surfaces of the prisms so that the optical features are internal to the assembled monolithic optical device. The beam splitting apparatus may be implemented in a communication terminal that exchanges data modulated light according to frequency-division duplex communications.