M-ary Frequency Presence Modulation Optical Communication System
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Solution Overview
Problem
Existing satellite laser communication systems rely on narrow bandwidth sources and modulation techniques that do not effectively utilize the available bandwidth for data encoding, limiting data transmission rates and efficiency.
Innovation Solution
An optical communication system employing M-ary frequency presence modulation, which spectrally segregates and modulates the bandwidth of an optical emission device to create multiple channels within the communication band, using a presence or absence of energy to represent data packets, enabling higher data transmission rates and efficient use of bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If narrow bandwidth sources and modulation techniques are used, then system complexity is reduced, but data transmission rate is limited
Solution Approach 1:
The patent divides the available optical bandwidth into multiple discrete frequency channels (e.g., 8 channels) within the communication band. Each channel can be independently modulated and detected, allowing parallel data transmission. This segmentation enables higher data rates by utilizing multiple frequency slots simultaneously rather than relying on a single narrow bandwidth channel.
Solution Approach 2:
The patent transitions from traditional time-domain modulation to frequency-domain modulation by introducing M-ary frequency presence modulation. Instead of varying a single parameter over time, the system encodes information across multiple frequency channels, adding a frequency dimension to the communication process. This dimensional expansion allows significantly higher data transmission rates without proportionally increasing system complexity.
2Productivity
If multiple emission devices are used to increase data transmission capacity, then data transmission rate improves, but size, weight, and power requirements increase
Solution Approach 1:
The patent employs a single optical emission device that can generate multiple frequency channels within its operating bandwidth. This universal approach allows one device to perform the function that would traditionally require multiple dedicated emission devices. The single device is configured to modulate different frequency channels simultaneously, achieving high data transmission rates without the weight penalty of multiple separate emitters.
Solution Approach 2:
The patent merges multiple communication functions into a single emission device by utilizing frequency division multiplexing. Instead of having separate devices for different data streams, the system combines multiple channels within one device's bandwidth. This merging reduces the overall system weight while maintaining the capacity to transmit multiple data streams simultaneously through the frequency presence modulation technique.
3Productivity
If bandwidth is divided into multiple channels, then data encoding efficiency improves, but device complexity increases
Solution Approach 1:
The frequency presence modulation unit is designed to automatically spectrally segregate the bandwidth and modulate the channels based on the control signal from the controller. The system self-configures the frequency channels and their corresponding data encoding without requiring manual intervention. This self-service capability improves data encoding efficiency while keeping the complexity manageable through automated control rather than complex manual switching mechanisms.
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 system achieves data transmission rates of up to 20 Gbps over distances greater than 30 km, reducing the size, weight, and power requirements of communication systems by over 50% compared to multiple emission devices, while providing secure and efficient data transfer.
Implementation Method 1
at least one optical emission device configured to output light energy as an optical beam having an operating bandwidth
Implementation Method 2
spectrally segregate a bandwidth portion of at least one communication band into plural channels
Implementation Method 3
modulate the bandwidth portion to selectively produce an optical output signal with wavelengths that correspond to one or more of the channels
Implementation Method 4
a telescope configured to transmit the optical output signal
Data Source
AI summary
An optical communication system having a data transmitter which includes: at least one optical emission device to output light energy as an optical beam having an operating bandwidth; a beam dividing device to receive and divide the operating bandwidth into plural communication bands; a frequency presence modulation unit to: spectrally segregate the bandwidth of at least one communication band into plural channels, and modulate the bandwidth to selectively produce an optical output signal with wavelengths that correspond to one or more of the channels, wherein presence and absence of energy within channels constitute an information packet for data communication; a controller for providing a control signal to the frequency presence modulation unit to spectrally segregate the bandwidth of the at least one communication band into the plural channels; and a telescope to transmit the optical output signal.