Multi-Channel Optical Transmitter Using Nested Beam Splitters
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Solution Overview
Problem
Current multi-channel optical transmitters are limited by their size and coupling efficiency, necessitating the development of compact and high-efficiency optical subassemblies for advanced optical communication systems.
Innovation Solution
The use of free space optics, specifically beam splitters and polarization beam splitters, to combine polarized optical signals with unique center wavelengths, allowing for efficient multiplexing and demultiplexing of signals in a compact transmitter optical subassembly (TOSA) design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-channel optical transmitters are used, then signal transmission capability is provided, but the device size is large and coupling efficiency is low
Solution Approach 1:
The patent implements nested optical paths where multiple optical signals are combined through hierarchical beam splitting and polarization beam splitting. The first beam splitter combines two optical signals, then the polarization beam splitter combines this combined signal with additional polarized optical signals, creating a nested structure that reduces overall device volume while maintaining multi-channel transmission capability.
Solution Approach 2:
The patent utilizes polarization dimensions to multiplex optical signals. By employing polarization beam splitters that separate and combine signals based on polarization states (TE and TM modes), the system adds an optical dimension for signal differentiation, enabling compact multi-channel transmission without increasing physical footprint.
2Volume of moving object
If compact TOSA design is implemented using free space optics, then device size is reduced, but signal coupling efficiency may be compromised
Solution Approach 1:
The patent applies wavelength-selective filtering at specific locations within the optical path. The wavelength selective filter is positioned to selectively transmit or block specific wavelength ranges, enabling precise control of optical signal coupling at critical points while maintaining compact overall device structure.
Solution Approach 2:
The patent introduces polarization beam splitters as intermediary components that mediate between different optical signals. These beam splitters act as intermediaries to combine or separate polarized optical signals with different polarization states, enabling efficient coupling in the compact free-space optical configuration.
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 enables the creation of a small-sized multi-channel optical signal generating device with high coupling efficiency, enhancing the performance of optical transmitters and transceivers in communication systems.
Implementation Method 1
The beam splitter is configured to combine first and second polarized optical signals by reflecting a first polarized optical signal towards a first target and allowing a second polarized optical signal to pass through towards the first target
Implementation Method 2
The polarization beam splitter is configured to combine the first and second polarized optical signals with a third polarized optical signal by either (i) reflecting the third polarized optical signal towards a second target and allowing the first and second polarized optical signals to pass through towards the second target
Data Source
AI summary
An optical multiplexer and methods of making and using the same are disclosed. The multiplexer generally includes a beam splitter and a polarization beam splitter. The beam splitter is generally configured to combine first and second polarized optical signals by reflecting a first polarized optical signal towards a first target and allowing a second polarized optical signal to pass through towards the first target. The polarization beam splitter is generally configured to combine the first and second polarized optical signals with a third polarized optical signal by either (i) reflecting the third polarized optical signal towards a second target and allowing the first and second polarized optical signals to pass through towards the second target, or (ii) reflecting the first and second polarized optical signals towards the second target and allowing the third polarized optical signal to pass through towards the second target.