Light Waveform Shaping Module for Signal Processing
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Solution Overview
Problem
Conventional analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) with low sampling rates and narrow bandwidths struggle to effectively process high-frequency signals, limiting the adoption of advanced signal processing techniques like delay-division-multiplexing OFDMA PON due to suppression of high-frequency signal portions.
Innovation Solution
A light waveform shaping method and apparatus that uses an optical modulation module to convert uplink signals into light pulse signals and optical gating to suppress code interference in downlink signals, preserving high-frequency signal portions by eliminating low-pass effects, thereby enabling the use of low-sampling-rate converters with wide bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional ADC or DAC with low sampling rate is used, then power consumption is reduced and computation is simplified, but high-frequency signal portions are suppressed and bandwidth is limited
Solution Approach 1:
The patent introduces an optical waveform shaping module as an intermediary between the DAC and ADC to preserve high-frequency signal portions. The module includes optical modulators that shape the waveform of digital signals, preventing suppression of high-frequency components while using low-sampling-rate converters. This mediator enables the system to maintain signal integrity without requiring high sampling rates, thus reducing power consumption while preserving reliability.
2Device complexity
If a conventional ADC or DAC with narrow bandwidth is used, then device complexity is reduced, but high-frequency signal portions are suppressed
Solution Approach 1:
The optical waveform shaping module serves as an intermediary that compensates for the narrow bandwidth of simple converters. By placing optical modulators in the signal path, the system can use low-complexity DACs and ADCs while still preserving high-frequency signal portions through optical waveform shaping, thus reducing device complexity without sacrificing signal preservation capability.
Solution Approach 2:
The patent replaces electrical signal processing with optical waveform shaping to overcome bandwidth limitations. Instead of using complex electrical filters or high-bandwidth converters, the system uses optical modulators to shape waveforms in the optical domain, effectively substituting electrical mechanisms with optical ones to achieve high-frequency preservation with simpler devices.
3Reliability
If the sampling rate is increased to preserve high-frequency signals, then signal preservation capability is improved, but power consumption increases and computation becomes more complex
Solution Approach 1:
The optical waveform shaping module acts as an intermediary that enables high-frequency signal preservation without increasing sampling rate. The optical modulators shape the waveform to prevent spectral overlap and maintain high-frequency components, allowing the system to use low-sampling-rate converters while still preserving signal integrity, thus improving signal preservation capability without increasing power consumption.
4Reliability
If the sampling rate is increased to preserve high-frequency signals, then signal preservation capability is improved, but device complexity increases
Solution Approach 1:
The patent substitutes electrical signal processing mechanisms with optical waveform shaping to preserve high-frequency signals. Instead of using high-sampling-rate converters which would increase device complexity, the system uses optical modulators to shape waveforms in the optical domain, achieving the same signal preservation effect with simpler electrical converters.
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 the preservation of high-frequency signal portions, facilitating the broader implementation of DDM techniques by overcoming the limitations of low-sampling-rate and narrow-bandwidth converters, enhancing signal processing capabilities.
Implementation Method 1
the light waveform shaping module includes an optical modulation module for turning the uplink signal into a light pulse signal
Implementation Method 2
the light waveform shaping module includes an optical gating for suppressing code interference of the downlink signal
Data Source
AI summary
A method and apparatus for signal processing by light waveform shaping are provided to process an uplink signal generated by a digital-to-analog converter (DAC) and/or process a downlink signal to be transmitted to an analog-to-digital converter (ADC). The method includes adjusting the waveform of the uplink signal and/or the waveform of the downlink signal with a light waveform shaping module so that, even if the DAC and/or ADC has a low sampling rate and a narrow bandwidth, a high-frequency signal portion of the uplink signal and/or a high-frequency signal portion of the downlink signal can be preserved.