Optical Angle Modulation Using Four-Wave Mixing for Wider Bandwidth
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Solution Overview
Problem
Generating broad-band angle-modulated light with optical angle modulators is challenging due to the difficulty in creating electrical signals with high voltage levels while maintaining linearity, leading to increased power consumption.
Innovation Solution
An optical angle modulator that generates first and second angle-modulated lights using an electrical signal, followed by partially degenerate four-wave mixing to produce third and fourth angle-modulated lights with broader bandwidths, utilizing optical fibers or semiconductor optical amplifiers to enhance bandwidth without increasing electrical signal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-voltage electrical signals are applied to generate broad-band angle-modulated light, then the bandwidth of angle-modulated light is improved, but the electrical power consumption increases and linearity deteriorates
Solution Approach 1:
The patent introduces an optical intermediary (angle-modulated light from a first modulator) to transfer the modulation function from the electrical domain to the optical domain. The second modulator then processes this optical signal, with the electrical signal serving only as a control mechanism rather than the primary modulation driver, thereby reducing electrical power requirements while maintaining broad bandwidth
Solution Approach 2:
The patent replaces the direct electrical modulation mechanism with an optical modulation mechanism. Instead of using high-voltage electrical signals to directly modulate the light source, the system uses electrical signals to modulate a first light source, then uses that modulated light to control a second light source, substituting electrical-mechanical interaction with optical interaction
2Measurement precision
If high-voltage electrical signals are applied to generate broad-band angle-modulated light, then the bandwidth of angle-modulated light is improved, but the linearity of the electrical signal deteriorates
Solution Approach 1:
The patent uses angle-modulated light as an intermediary carrier that preserves the linear relationship between the electrical signal and the optical modulation. The first modulator converts the electrical signal to optical domain with high linearity, and this linear optical signal then controls the second modulator, maintaining overall system linearity without requiring high-voltage electrical signals
Solution Approach 2:
The patent substitutes the direct electrical control of the light source with an optical control mechanism. The electrical signal modulates a first light source optically, and this modulated light then controls a second light source, replacing the direct electrical-mechanical modulation path with an optical path that preserves linearity
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 modulator achieves a bandwidth three to nine times broader than conventional techniques using the same electrical signal voltage level, reducing power consumption and maintaining signal quality.
Implementation Method 1
a first generating unit configured to generate first angle-modulated light and second angle-modulated light by performing angle modulation on continuous light using an electrical signal
Implementation Method 2
a second generating unit configured to generate third angle-modulated light by causing partially degenerate four-wave mixing of the first angle-modulated light and the second angle-modulated light
Data Source
AI summary
An optical angle modulator includes: a first unit configured to generate first angle-modulated light and second angle-modulated light by performing angle modulation on continuous light using an electrical signal; and a second unit configured to generate third angle-modulated light by causing partially degenerate four-wave mixing of the first and second angle-modulated lights. A frequency band of the first angle-modulated light and a frequency band of the second angle-modulated light are different, and an angle of the second angle-modulated light decreases due to the electrical signal while an angle of the first angle-modulated light is increasing due to the electrical signal, and the angle of the second angle-modulated light increases due to the electrical signal while the angle of the first angle-modulated light is decreasing due to the electrical signal.