Optical Transmitter RZ-DPSK Generation via Mach-Zehnder Modulator
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Solution Overview
Problem
Existing optical transmission systems face challenges in increasing transmission speed and reducing costs while maintaining stability, particularly when generating RZ-DPSK signals in the electric area, as they require additional circuits and complex control systems, leading to increased man-hours and costs.
Innovation Solution
An optical transmitter that includes a differential encoder, an RZ encoder, and a Mach-Zehnder interferometer type intensity modulator to generate an optical RZ-DPSK signal directly from an electric RZ differential signal, reducing the circuit scale and stabilizing the apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If RZ-DPSK signals are generated in the electric area using additional circuits, then transmission speed and reception sensitivity are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces electric-area signal processing circuits with an optical-area generation system using a Mach-Zehnder interferometer. The differential encoder and RZ encoder are implemented optically, substituting complex electric circuits with optical components that directly generate RZ-DPSK signals, thereby reducing device complexity while maintaining high transmission speed and reception sensitivity
Solution Approach 2:
The Mach-Zehnder interferometer serves multiple functions: it performs differential encoding, RZ pulse generation, and phase modulation simultaneously. This multi-functional optical component consolidates what would otherwise require separate electric circuits, reducing overall system complexity while achieving the desired signal generation
2Reliability
If RZ-DPSK signals are generated in the electric area with additional circuits, then transmission performance is improved, but manufacturing cost and man-hours increase
Solution Approach 1:
By replacing electric circuit implementations with an optical Mach-Zehnder interferometer system, the patent reduces the number of components requiring assembly and testing. The optical generation approach simplifies the manufacturing process and reduces man-hours while maintaining reliable high-performance transmission
Solution Approach 2:
The patent extracts the signal generation function from the electric domain and implements it in the optical domain. This separation removes the need for complex electric circuits and their associated manufacturing complexities, reducing both cost and manufacturing time while preserving transmission performance
3Manufacturing precision
If complex control systems are used for electric-area RZ-DPSK generation, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent replaces electric control systems with inherent optical interference mechanisms in the Mach-Zehnder interferometer. The differential encoding and RZ pulse shaping are achieved through optical path differences and interferometric effects rather than complex electric control, maintaining signal quality while reducing control system complexity
Solution Approach 2:
The Mach-Zehnder interferometer performs differential encoding and RZ pulse generation through its inherent optical interference mechanism without requiring external control circuits. The system is self-regulating through the optical paths, eliminating the need for complex control systems while ensuring high signal quality
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 allows for a smaller, more stable, and cost-effective optical transmitter that efficiently generates optical RZ-DPSK signals, reducing the complexity and cost of circuit design and manufacturing.
Implementation Method 1
a Mach-Zehnder interferometer type intensity modulator that generates an optical RZ-DPSK (differential phase shift keying) signal as an RZ signal in an optical area based on the electric RZ differential signal
Data Source
AI summary
A differential encoder generates a differentially encoded signal based on a data signal. An RZ (return to zero) encoder generates an electric RZ differential signal as an RZ signal in an electric area based on the differentially encoded signal. A Mach-Zehnder interferometer type intensity modulator generates an optical RZ-DSPK (differential phase shift keying) signal as an RZ signal in an optical area based on the electric RZ differential signal.