Phase Deviation Multiplication for Electro-Optic Modulators
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Solution Overview
Problem
Current electro-optic modulators have limited bandwidth and modulation sensitivity, particularly in achieving high wideband frequency and phase modulation sensitivities, despite improvements in waveguide structures and materials like polymers with higher electro-optic coefficients.
Innovation Solution
A multi-stage phase deviation multiplication system is employed, using phase deviation multipliers and nonlinear devices to generate frequency combs, which are then filtered to maintain the frequency of the electromagnetic signal within a specific band, thereby amplifying phase deviation while keeping the signal within the operational frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonant structures are used to increase electromagnetic field in electro-optic material, then modulation sensitivity is improved, but bandwidth is limited
Solution Approach 1:
The system segments the modulation function into multiple independent phase deviation multipliers operating in sequence. Each multiplier processes a portion of the phase deviation, allowing the system to achieve high overall modulation sensitivity without requiring a single resonant structure that would limit bandwidth. The segmented approach enables wideband operation while maintaining high sensitivity through cumulative phase deviation multiplication.
2Measurement precision
If phase deviation multiplication is achieved through frequency multiplication, then modulation sensitivity increases, but signal frequency moves outside operational band
Solution Approach 1:
The system introduces an intermediary frequency conversion process using nonlinear devices and bandpass filters. The phase deviation multipliers generate frequency combs that contain the desired phase-deviated signal at multiples of the input frequency. The bandpass filter acts as an intermediary to select and return the signal to the original frequency band, enabling high modulation sensitivity while maintaining frequency band compatibility through the intermediary filtering stage.
3Productivity
If higher drive voltages are used to achieve higher frequency deviations, then modulation capability increases, but power consumption and device stress increase
Solution Approach 1:
The system changes the operating parameters by using phase deviation multiplication rather than direct voltage-driven modulation. Each phase deviation multiplier stage accumulates phase deviation through nonlinear optical processes, allowing the final output to achieve high frequency deviations with relatively low drive voltages at each stage. This parameter change from direct voltage control to cumulative phase multiplication reduces power consumption and device stress while maintaining high modulation capability.
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 enhances modulation sensitivity, allowing for lower drive voltages and higher frequency deviations, effectively increasing the modulation capabilities of electro-optic modulators while maintaining the signal within the desired frequency band.
Implementation Method 1
A nonlinear device receives the combined signal and generates frequency combs that have amplified phase deviations relative to the input signal
Implementation Method 2
A selective bandpass filter is configured to receive the plurality of frequency combs and to selectively output a phase deviated signal
Data Source
AI summary
Technologies are described herein for a phase deviation multiplication apparatus that implements an in-place multiplication approach for multiplying the phase deviation of an input signal while maintaining the frequency of the carrier signal within a frequency band of operation. According to an embodiment, a multi-stage phase deviation multiplication apparatus includes a plurality of sequentially arranged phase deviation multipliers, including at least a first phase deviation multiplier and a last phase deviation multiplier. The phase deviation multipliers have respective predetermined phase deviation multiplication factors. The first phase deviation multiplier receives an input signal and the last phase deviation multiplier generates a last phase deviated signal. The last phase deviated signal has a phase deviation multiplication factor that is the product of the respective predetermined phase deviation multiplication factors of the plurality of phase deviation multipliers.