Optical Signal Slicing and Stitching for Dynamic Bandwidth Allocation
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Solution Overview
Problem
Optical transmission lines often face challenges in transmitting signals with bandwidths greater than available frequency slots, leading to severe inter-channel interference due to spectrum overlapping, which existing technologies struggle to address effectively.
Innovation Solution
The method involves generating a coherent copy of the optical signal using optical frequency comb lines, slicing it into portions that fit within available bandwidths of multiple channels, and stitching these slices together at the receiver to reconstruct the original signal, enabling efficient transmission of signals with bandwidths exceeding individual slot capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single frequency slot is used to transmit an optical signal, then the transmission is simple and straightforward, but the available bandwidth is insufficient for high-bandwidth signals
Solution Approach 1:
The optical signal is divided into multiple spectral slices that can be independently allocated to different frequency slots. This segmentation allows the total bandwidth of the signal to exceed the bandwidth of any single frequency slot, resolving the contradiction between bandwidth capacity and slot limitations.
Solution Approach 2:
The patent transitions from single-dimensional (single frequency slot) to multi-dimensional (multiple frequency slots across the spectrum) transmission. By allocating signal slices across multiple dimensional slots in the frequency domain, the system achieves higher total bandwidth capacity while maintaining compatibility with existing slot-based infrastructure.
2Quantity of substance
If multiple frequency slots are combined to transmit a high-bandwidth signal, then the total bandwidth capacity increases, but inter-channel interference occurs due to spectrum overlapping
Solution Approach 1:
The signal spectrum is segmented into distinct non-overlapping slices, each assigned to a specific frequency slot. This segmentation eliminates spectrum overlapping between adjacent slots, thereby preventing inter-channel interference while maintaining high total bandwidth utilization.
Solution Approach 2:
Each frequency slot is assigned a specific spectral slice with localized frequency characteristics. This local quality assignment ensures that each slot operates independently without interfering with neighboring slots, while the collective slots provide the required total bandwidth capacity.
3Adaptability or versatility
If the optical signal is sliced into multiple portions and transmitted through separate channels, then the bandwidth allocation flexibility improves, but the system complexity and processing requirements increase
Solution Approach 1:
The optical signal is segmented into multiple spectral slices using optical filtering techniques. This segmentation enables flexible allocation of different slice combinations to different channels based on bandwidth requirements, while the optical domain processing keeps the system complexity manageable compared to full electrical processing.
Solution Approach 2:
The patent uses optical frequency comb lines to generate coherent copies of the optical signal at different frequency offsets. These copies are then sliced and allocated to different channels. The copying approach simplifies the slicing process by providing phase-coherent replicas that can be independently processed and recombined at the receiver.
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 allows for efficient transmission of high-bandwidth signals by reducing inter-channel interference and maintaining signal quality, with negligible OSNR penalty and tolerance to phase/amplitude imbalances, thus enhancing the capacity and efficiency of optical transmission systems.
Implementation Method 1
coupling the optical signal with a first pair of spacing coherent optical frequency comb lines separated by the spacing frequency to create an optical signal copy that is spaced from the optical signal by the spacing frequency
Implementation Method 2
coupling the optical signal with a first pair of spacing coherent optical frequency comb lines
Implementation Method 3
filtering a first slice of the optical signal and a second slice of the optical signal copy
Data Source
AI summary
A method for transmitting an optical signal through a first channel and a second channel includes coupling the optical signal with a first pair of comb lines separated by a spacing frequency to create an optical signal copy that is spaced from the optical signal by the spacing frequency. The method also includes filtering a first slice of the optical signal and a second slice of the optical signal copy. The method also includes transmitting the first slice of the optical signal and the second slice of the optical signal through the first channel and the second channel, respectively. The method also includes stitching the first slice of the optical signal with the second slice of the optical signal copy to generate a stitched version of the original optical signal.