Polarisation-Maintaining Optical Switch for Power-Efficient Buffering
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Solution Overview
Problem
Conventional optical buffering in medical imaging systems, such as OCT, results in significant power loss due to the recombination of optically buffered signals using 50/50 couplers, leading to reduced system sensitivity and image quality.
Innovation Solution
The implementation of an optical switch that toggles between buffered and non-buffered signals, redirecting each signal to a single output, eliminating power loss by sequentially gating multiple optical paths to a single output port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 50/50 couplers are used to recombine optically buffered signals, then optical buffering can be achieved to increase effective imaging speed, but significant power loss occurs reducing system sensitivity and image quality
Solution Approach 1:
The patent employs dynamic optical switching to selectively route buffered and non-buffered signals in time-varying sequences. The optical switch dynamically changes its state to direct different optical paths to the output at different times, enabling flexible signal combination without fixed 50/50 power division. This dynamic routing achieves effective imaging speed enhancement while preserving optical power by ensuring 100% of signal power reaches the output during each time slot.
Solution Approach 2:
The patent implements periodic switching between buffered and non-buffered signal paths at synchronized intervals. By alternating between different optical path configurations in a periodic manner matched to the imaging sequence, the system achieves time-averaged speed enhancement while maintaining consistent power delivery. The periodic switching ensures that during each imaging frame, the appropriate signals are routed without power loss.
2Speed
If conventional optical buffering is used to increase imaging speed, then effective imaging speed beyond native source speed is achieved, but system sensitivity and image quality deteriorate due to power loss
Solution Approach 1:
The optical switch dynamically routes signals to preserve power, and the polarization controller actively maintains optimal polarization states throughout the optical paths. This dynamic adaptation ensures that image quality is preserved despite the complex time-varying signal routing required for speed enhancement. The system adjusts polarization parameters in real-time to compensate for any polarization-related signal degradation.
Solution Approach 2:
The patent changes the polarization state parameters of optical signals using a polarization controller to maintain optimal signal characteristics through the buffering system. By adjusting polarization parameters, the system ensures consistent signal quality regardless of the buffering path taken, thereby maintaining image quality while achieving speed enhancement through optical buffering.
3Speed
If optical signals are split into multiple paths for buffering, then effective imaging speed is increased, but power loss occurs during recombination reducing signal-to-noise ratio
Solution Approach 1:
The optical switch dynamically selects which buffered or non-buffered signal path to connect to the output at any given time, ensuring that 100% of the optical power from the active path reaches the detector without division loss. This dynamic time-division multiplexing approach preserves signal-to-noise ratio by avoiding the continuous power division inherent in simultaneous multi-path recombination, while still achieving effective speed enhancement through the buffering architecture.
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 enhances signal-to-noise ratios and image resolution by ensuring that 100% of the optical power is directed to the OCT interferometer, improving imaging quality and reducing power loss compared to traditional buffering methods.
Implementation Method 1
an optical switch for recombining buffered and non-buffered optical signals transmitted through the optical circuit, the optical switch having two input ports and a single output port, the optical switch being a polarisation-maintaining optical switch
Data Source
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AI summary
The present invention generally relates to optical circuits for mitigating power loss in medical imaging systems and methods for using such circuits. Circuits of the invention can involve a first optical path, a second optical path, and a means for recombining an optical signal transmitted through the first and second optical paths by sequentially gating the first and second optical paths to a single output.