M-ary PSK Modulator Using Voltage Control
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Solution Overview
Problem
Conventional PSK modulation systems for optical networks are costly, complex, and inefficient due to the use of multiple modulators and high component accuracy requirements, with conventional QPSK systems being particularly expensive and difficult to operate.
Innovation Solution
A method and system for m-ary phase-shift keying modulation that uses fewer components, including a signal source, signal attenuator, voltage adjustment component, voltage combining component, optical amplifier, and optical attenuator, to perform amplitude and phase modulation, reducing costs and complexity while allowing for high-order PSK modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional QPSK systems use multiple modulators to achieve phase modulation, then modulation functionality is achieved, but system cost and complexity increase significantly
Solution Approach 1:
The patent combines multiple modulator functions into a single modulator by using multiple independent voltage signals (I and Q voltages) to control one modulator device. This merging approach reduces the number of modulators from multiple to one, thereby reducing system complexity and cost while maintaining the phase modulation functionality through coordinated voltage control.
Solution Approach 2:
The single modulator is designed to handle multiple functions by accepting multiple voltage inputs (I and Q voltages) that can independently control different aspects of the optical signal. This multi-functionality allows one modulator to perform what previously required multiple separate modulators, achieving both phase and amplitude modulation capabilities simultaneously.
2Manufacturing precision
If conventional systems require high component accuracy to achieve proper modulation, then modulation precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent changes the control parameters from requiring precise physical component characteristics to using independently adjustable voltage signals (I and Q voltages). This parameter change allows for electronic control and adjustment of modulation characteristics without requiring high manufacturing precision of the modulator itself, thereby improving ease of operation while maintaining modulation precision through voltage control.
3Device complexity
If fewer components are used to reduce cost and complexity, then system simplicity is improved, but ability to achieve high-order PSK modulation may deteriorate
Solution Approach 1:
The patent introduces dynamic control through multiple independent voltage signals (I and Q voltages) that can be programmatically adjusted to achieve different modulation schemes. This dynamic control allows the single modulator to adapt to various high-order PSK requirements by changing voltage patterns rather than requiring hardware changes, maintaining versatility while reducing component count.
Solution Approach 2:
By using independently controllable voltage parameters (I and Q voltages), the system can dynamically change modulation characteristics to support different high-order PSK schemes (e.g., QPSK, 8-PSK, 16-PSK) without requiring different hardware configurations. This parameter-based adaptability maintains high-order PSK capability while using fewer components.
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 proposed system reduces costs and complexity by using fewer components, enhances data transmission efficiency, and allows for flexible implementation of high-order PSK modulation, while being compatible with conventional systems.
Implementation Method 1
performing phase-shift keying modulation on the amplitude-modulated light signal using an optical amplifier. The optical amplifier is characterized by an amplitude/phase characteristic.
Data Source
AI summary
System and method for m-ary phase shifting keying modulation. According to an embodiment, the present invention provides a method for performing m-ary phase-keying shift modulation. The method includes providing at least a first signal and a second signal by a signal source. The first signal and the second signal are characterized by a first signal strength level. The method also includes attenuating the second signal to provide a third signal. The second signal are characterized by a second signal strength level which is at approximate 50% of the first signal strength level. The method additionally includes coupling the first signal to a first bias voltage to provide a fourth signal. Furthermore, the method includes coupling the third signal to a second bias voltage to provide a fifth signal. The method also includes a step for providing a sixth signal by combing the fourth signal and the fifth signal.