Optical Return-to-Zero Signal Generation with Differential Bi-Phase Shift
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Solution Overview
Problem
Conventional systems for generating optical return-to-zero signals are complex and expensive, and they face challenges in maintaining signal quality due to dispersion and nonlinear distortions, particularly in optical networks.
Innovation Solution
A system and method for generating optical return-to-zero signals with differential bi-phase shift and frequency chirp, utilizing an electro-optical conversion system that processes input electrical non-return-to-zero signals to produce an optical differential return-to-zero signal with frequency chirp, employing pre-coding and signal processing techniques to drive a Mach-Zehnder modulator, thereby improving signal dispersion tolerance and resistance to nonlinear distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional systems are used to generate optical return-to-zero signals, then signal generation is achieved, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by introducing differential bi-phase shift and frequency chirp parameters to the optical signal. The frequency chirp parameter varies the optical frequency over time, while the differential bi-phase shift alternates between 0 and 180 degrees. These parameter modifications enable the system to maintain signal quality and reduce nonlinear distortions without increasing device complexity
Solution Approach 2:
The patent replaces conventional mechanical or electronic signal generation methods with an electro-optical conversion system. By using an electro-optical modulator to directly generate optical differential return-to-zero signals with frequency chirp and differential bi-phase shift, the system eliminates the need for complex mechanical or electronic intermediate stages, thereby reducing transmitter complexity while maintaining signal quality
2Length of moving object
If optical signals are transmitted over long distances, then transmission capability is achieved, but dispersion and nonlinear distortions degrade signal quality
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for dispersion and nonlinear distortions through the frequency chirp and differential bi-phase shift mechanisms. The frequency chirp introduces a frequency variation that counteracts the effects of dispersion, while the differential bi-phase shift creates alternating phase patterns that reduce nonlinear distortions. This preliminary counter-action allows long-distance transmission without significant signal degradation
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical signal's frequency and phase characteristics. The frequency chirp parameter introduces time-dependent frequency variations that compensate for dispersion effects, while the differential bi-phase shift parameter creates alternating phase patterns that reduce nonlinear distortions. These parameter modifications enable maintained signal quality over long transmission distances
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 solution significantly reduces the complexity and cost of transmitters for optical differential return-to-zero signals, enhances dispersion tolerance, and increases resistance to nonlinear distortions, improving the performance of fiber optical transport systems for high data rates.
Implementation Method 1
an electro-optical modulator configured to receive the light, the first driving signal and the second driving signal, modulate the light with the first driving signal and the second driving signal, and generate an output optical signal
Data Source
AI summary
A system and method for generating an optical return-to-zero signal. The system includes an electro-optical conversion system. The electro-optical conversion system is configured to receive an input electrical non-return-to-zero signal, process information associated with the input electrical non-return-to-zero signal, and generate an output optical return-to-zero signal based on at least information associated with the input electrical non-return-to-zero signal. The output optical return-to-zero signal is an optical differential return-to-zero signal, and the optical differential return-to-zero signal is associated with a frequency chirp.