Frequency-Aligned Optical Transmission for RF and Pulse Signals
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Solution Overview
Problem
Existing optical communication systems face challenges in transmitting high-speed pulse signals and RF signals simultaneously due to noise interference, making it difficult to achieve high-quality transmission in a single path.
Innovation Solution
A transmission device that generates RF and pulse signals with specific frequency relationships, superimposes them, amplifies the combined signal, and converts it to an optical signal for transmission, using a single optical fiber path, with dedicated demodulation units for each signal at the reception end to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-speed pulse signal is transmitted simultaneously with an RF signal in the same optical path, then transmission path utilization is improved, but noise interference increases making difficult to transmit both signals with high quality
Solution Approach 1:
The patent applies parameter changes by establishing a specific frequency relationship between the pulse signal and RF signal, where the carrier wave frequency fr of the RF signal is set to be an integer multiple (n times) of the first frequency fs (reciprocal of modulation speed) of the pulse signal. This frequency parameter relationship causes the frequency components of the two signals to be distributed in a way that minimizes overlap and interference, enabling simultaneous transmission with high quality in the same optical path.
2Reliability
If multiple light sources and wavelength filters are used to transmit different signals, then signal transmission quality is improved, but device complexity and costs increase
Solution Approach 1:
The patent merges the transmission of multiple signals (pulse signal and RF signal) into a single optical path using a single light source. Instead of using separate light sources and wavelength filters for each signal type, the invention combines both signals into one optical carrier and transmits them simultaneously through one fiber path, thereby reducing device complexity and costs while maintaining transmission quality through the specific frequency relationship design.
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 effectively suppresses noise interference, reduces system complexity and costs by eliminating the need for multiple light sources and wavelength filters, and ensures high-quality demodulation of both signals.
Implementation Method 1
a light-emitting element configured to convert the amplified signal to an optical signal and generate a superimposed optical signal
Implementation Method 2
a light-receiving element configured to receive the superimposed optical signal and convert the superimposed optical signal into a superimposed electric signal
Data Source
AI summary
A transmission device includes an RF signal generation unit, a pulse signal generation unit, a coupling unit, a linear driver, and a light-emitting element. The RF signal generation unit generates an RF signal to be modulated by a carrier wave. The pulse signal generation unit generates a pulse signal. The coupling unit couples the RF signal and the pulse signal to each other and generate a superimposed signal. The linear driver amplifies the superimposed signal and generate an amplified signal. The light-emitting element converts the amplified signal to an optical signal and generate a superimposed optical signal. The pulse signal generation unit generates the pulse signal in such a way to satisfy fr=n×fs, where fr is a carrier wave frequency of the RF signal, fs is a first frequency being a reciprocal of a modulation speed of the pulse signal, and n is a natural number.