Optical Receiver Asymmetric Splitter QAM Separation
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Solution Overview
Problem
Current optical receivers face challenges in efficiently separating and processing magnitude and phase modulations in quadrature amplitude modulation (QAM) for improved data transmission capacity and communication quality, particularly in high-capacity optical communication systems like those required for mobile communication and high-quality video streaming.
Innovation Solution
An optical receiver design that includes an optical splitter to generate separate light signals with different luminous intensities, amplified by distinct gain sections, and an optoelectronic conversion unit to demodulate these signals, ensuring effective separation and processing of magnitude and phase components, with asymmetric splitting and attenuation to optimize signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a higher-order modulation method (QAM) is used to increase data transmission capacity, then the data transmission capacity is improved, but the signal processing complexity and difficulty of separating magnitude and phase modulations increase
Solution Approach 1:
The patent applies segmentation by dividing the QAM signal into separate magnitude and phase components through optical splitting. The optical splitter divides the input light signal into multiple paths, with each path processing either magnitude or phase information independently. This segmentation allows the receiver to handle magnitude and phase modulations separately, reducing the overall signal processing complexity while maintaining high data transmission capacity.
Solution Approach 2:
The patent extracts magnitude and phase components from the QAM signal using distinct optical paths. By taking out each modulation component separately through the optical splitter and dedicated amplifiers, the system simplifies the demodulation process. The magnitude component is extracted through one path while the phase component is extracted through another, enabling independent processing and reducing computational complexity.
2Measurement precision
If linear gain amplification is used for the first light signal, then the reception sensitivity for magnitude modulation is improved, but the luminous intensity control for phase modulation becomes less effective
Solution Approach 1:
The patent applies local quality by assigning different amplification characteristics to different optical paths based on their specific requirements. The first amplifier uses linear gain characteristics optimized for magnitude modulation detection, while the second amplifier uses saturation gain characteristics optimized for phase modulation. This localized optimization allows each path to have the quality needed for its specific function without compromising the other.
Solution Approach 2:
The patent implements dynamics by allowing the amplifiers to operate in different gain regimes (linear vs. saturation) depending on the signal type. The system dynamically adapts the amplification characteristics to match the processing requirements of each modulation component, enabling optimal reception sensitivity for magnitude while maintaining effective luminous intensity control for phase.
3Illumination intensity
If saturation gain amplification is used for the second light signal, then the luminous intensity changes in phase modulation are controlled, but the reception sensitivity for magnitude modulation is reduced
Solution Approach 1:
The patent segments the signal processing into separate optical paths, allowing the second amplifier to use saturation gain amplification exclusively for phase modulation without affecting magnitude modulation sensitivity. This segmentation isolates the effects of different amplification modes to their respective signal paths, enabling optimal performance for each modulation type.
4Measurement precision
If an asymmetric optical splitter is used to generate light signals with different luminous intensities, then the separation of magnitude and phase modulations is improved, but the device complexity increases
Solution Approach 1:
The patent directly applies asymmetry by using an asymmetric optical splitter that generates light signals with different luminous intensities for magnitude and phase processing paths. This asymmetric splitting ratio is optimized to provide the appropriate signal levels for each modulation type, improving the precision of modulation separation while maintaining a relatively simple optical component structure.
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 solution enhances the reception sensitivity for magnitude modulation and controls luminous intensity changes in phase modulation, thereby improving communication quality and data transmission capacity in optical communication systems.
Implementation Method 1
an optical attenuator that attenuates a luminous intensity of the external light signal, and an asymmetric optical splitter that receives the attenuated external light signal from the optical attenuator, asymmetrically splits the attenuated external light signal into the first light signal and the second light signal
Implementation Method 2
a first amplifier that amplifies the first light signal in a linear gain section to output an amplified first light signal
Implementation Method 3
a second amplifier that amplifies the second light signal in a saturation gain section to output an amplified second light signal
Implementation Method 4
an optoelectronic conversion unit that outputs an electrical signal, based on the amplified first light signal, the in-phase hybrid light signal, and the quadrature-phase hybrid light signal
Data Source
AI summary
Disclosed is an optical receiver. The optical receiver includes an optical splitter that splits an external light signal to output a first light signal and a second light signal, a first amplifier that amplifies the first light signal in a linear gain section to output an amplified first light signal, a second amplifier that amplifies the second light signal in a saturation gain section to output an amplified second light signal, a polarization division hybrid that outputs an in-phase hybrid light signal and a quadrature-phase hybrid light signal, based on a reference light signal and the amplified second light signal, and an optoelectronic conversion unit that outputs an electrical signal, based on the amplified first light signal, the in-phase hybrid light signal, and the quadrature-phase hybrid light signal.