Wavelength-Tunable Optical Transmitter for Control Signal Superimposition
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Solution Overview
Problem
The modulation index in existing optical communication systems has a trade-off relationship between the main signal and control signal, leading to deterioration of the main signal's characteristics when attempting to improve the control signal's characteristics.
Innovation Solution
An optical transmitter and receiver system that uses a wavelength-tunable driver to convert control signals into wavelength control signals, allowing the control signal to be superimposed on the main signal without affecting its intensity, using a wavelength-tunable light source and optical modulator to modulate the main and control signals separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the modulation index is increased to improve the signal characteristic (receiving sensitivity) of the AMCC signal, then the receiving sensitivity of the AMCC signal is improved, but the signal characteristic of the main signal deteriorates
Solution Approach 1:
The patent transitions from intensity modulation (one-dimensional amplitude control) to wavelength modulation for the AMCC signal. By modulating the wavelength rather than the intensity, the control signal can be superimposed on the main signal without affecting the main signal's intensity characteristics, thus resolving the trade-off between AMCC receiving sensitivity and main signal quality
Solution Approach 2:
The patent separates the modulation of the main signal and the AMCC signal into independent dimensions. The main signal is modulated in intensity at a higher frequency, while the AMCC signal is modulated in wavelength at a lower frequency. This segmentation allows independent optimization of both signals without mutual interference
2Adaptability or versatility
If the modulation index is adjusted by controlling the signal amplitude of the AMCC signal, then the modulation index can be optimized, but the intensity of the main signal is affected
Solution Approach 1:
The patent replaces the mechanical intensity control mechanism with an optical wavelength control mechanism. Instead of adjusting the amplitude of the AMCC signal to optimize the modulation index, the system uses wavelength tuning, which does not interfere with the main signal's intensity, thereby maintaining both optimization capability and signal integrity
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
Enables the superimposition of control signals without impacting the intensity of the main signal, improving signal-to-noise ratio and transmission sensitivity.
Implementation Method 1
a wavelength-tunable transmitter that generates a modulated optical signal on the basis of the main signal and the signal for wavelength control
Implementation Method 2
a wavelength-tunable driver that converts the control signal generated by the control signal generation unit into a signal for wavelength control
Data Source
AI summary
An optical transmitter includes: a main signal generation unit that generates a main signal; a control signal generation unit that generates a control signal having a speed lower than a speed of the main signal; a wavelength-tunable driver that converts the control signal generated by the control signal generation unit into a signal for wavelength control; and a wavelength-tunable transmitter that generates a modulated optical signal on the basis of the main signal and the signal for wavelength control.