FSO QoS Modulation for Turbulence-Resilient Data Links
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Solution Overview
Problem
Existing Free Space Optics (FSO) systems face challenges in maintaining reliable and timely data transmission due to atmospheric turbulence, leading to retransmissions that can cause software applications to fail, as they lack effective Quality of Service (QoS) implementation.
Innovation Solution
Implementing a QoS modulator that adjusts the bandwidth of data streams based on a QoS metric, using a QoS Metric generator, modulator, optical transmitter, receiver, and demodulator to ensure reliable transmission by reducing bandwidth for critical data, thereby increasing link margin and reducing retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard bandwidth is used for all data streams in FSO communication, then transmission speed is maintained, but link margin decreases and retransmissions increase under atmospheric turbulence
Solution Approach 1:
The system dynamically adjusts the bandwidth of data streams based on real-time QoS metrics and atmospheric turbulence conditions. The QoS modulator varies bandwidth allocation for different data streams according to their priority and current channel conditions, allowing the system to optimize between reliability and speed dynamically rather than using fixed bandwidth allocation
Solution Approach 2:
The invention changes the bandwidth parameter of transmitted signals based on QoS metrics. By adjusting bandwidth as a variable parameter rather than keeping it constant, the system can increase link margin during turbulent conditions (reducing bandwidth) while maintaining higher speeds when conditions are favorable, thus resolving the contradiction between reliability and productivity
2Reliability
If retransmission is implemented for unsuccessful data transmission, then transmission reliability improves, but transmission delay increases and software applications fail
Solution Approach 1:
The system performs preliminary actions by adjusting bandwidth and applying QoS metrics to data streams before transmission occurs. By pre-configuring appropriate bandwidth levels based on data priority and predicted channel conditions, the system prevents transmission failures rather than relying on post-failure retransmission, thus avoiding time loss
Solution Approach 2:
The system uses feedback mechanisms where QoS metrics are continuously monitored and used to adjust bandwidth allocation for subsequent transmissions. This closed-loop control allows the system to adapt to changing atmospheric conditions in real-time, maintaining reliable transmission without requiring retransmissions that would cause delays
3Productivity
If bandwidth is increased for higher data rate, then transmission speed improves, but link margin decreases making transmission more vulnerable to turbulence
Solution Approach 1:
The system changes the bandwidth parameter dynamically based on QoS metrics and channel conditions. When atmospheric turbulence increases or QoS requirements demand higher reliability, the system reduces bandwidth to increase link margin. When conditions are favorable and QoS allows, the system increases bandwidth to maximize data transmission rate, thus resolving the contradiction between productivity and reliability
Data Source
AI summary
Methods, systems, and devices to realize Quality of Service (QoS) in a Free Space Optics (FSO) communications link. In operation, the application generating the data source assigns a QoS value to each data packet for optical transmission. The FSO system converts this value to a QoS metric based on the capability of the system to synthesize transmit signals of varying bandwidths. The QoS modulator synthesizes a waveform with bandwidth selected by the QoS metric. This implementation may take the form of time-division multiplexing either at the intra- or inter-packet level; there are fixed time intervals arranged between the transmit and receive FSO systems for specific waveform bandwidths. The transmit and receive process continues in a typical fashion until the signal reaches the QoS optical receiver followed by the QoS demodulator. Here the bandwidth set by the QoS metric is accounted for in either the analog or digital domain and the recovery of the original data source follows. This process provides the advantage of improved resiliency of critical networking packets in an FSO communications link.