Microcontroller Carrier Modulation for Multi-Channel Fiber Transmission
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Solution Overview
Problem
In high-density and long-distance optical fiber transmission for 5G communication, existing methods face challenges in controlling pulse width modulation (PWM) for carrier signals with different frequencies, particularly due to difficulties in managing external capacitor charging, discharging, resistance values, and temperature drift, especially in multi-channel transmission scenarios.
Innovation Solution
A microcontroller with a setting unit, encoder, modulation circuit, and digital-to-analog converter is used to generate and modulate carrier signals based on control signals, including parameters like samples per period, sampling intervals, carrier amplitude, and bias, allowing for efficient loading of carrier signals at logic high and low levels, thereby simplifying modulation settings and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If PWM is used to automatically adjust the duty cycle to create the carrier signal, then the modulation process is automated, but the control difficulty increases due to external capacitor charging, discharging, resistance value, and temperature drift characteristics
Solution Approach 1:
The patent replaces the traditional PWM hardware-based duty cycle adjustment mechanism with a digital signal processing approach. The microcontroller generates carrier signals and modulation signals entirely in the digital domain, using software algorithms to control amplitude and frequency modulation without relying on external capacitors, resistors, or analog timing circuits. This substitution eliminates temperature drift and component tolerance issues while maintaining automation.
Solution Approach 2:
The patent changes the control parameters from analog duty cycle values to digital amplitude and frequency parameters. Instead of adjusting PWM duty cycles through hardware components susceptible to temperature drift, the system uses digital variables to directly control carrier signal characteristics. This parameter transformation simplifies the control system by removing sensitive analog components while preserving automated modulation capabilities.
2Productivity
If multiple transmitting and receiving ends are used for multi-channel transmission, then transmission capacity increases, but the difficulty of controlling modulation settings increases
Solution Approach 1:
The patent implements a universal modulation framework where a single microcontroller design can handle multiple channels and different modulation types (AM, FM, PM) through software configuration. The same hardware platform supports various communication protocols and frequency ranges by changing digital parameters rather than requiring dedicated hardware circuits for each channel. This universality enables multi-channel transmission while keeping the control system manageable through standardized digital interfaces.
Data Source
AI summary
A microcontroller includes a setting unit, an encoder, a modulation circuit, and a digital-to-analog converter. The setting unit outputs a control signal. The encoder outputs a digital signal that is encoded. The modulation circuit loads at least one carrier signal on the digital signal at the logic high level and/or the logic low level according to the control signal to generate a modulated digital signal. The digital-to-analog converter converts the modulated digital signal into an analog signal, and outputs the analog signal for transmission.