Optical Transmission System Stabilization Without Isolators
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Solution Overview
Problem
Existing optical transmission systems require expensive optical isolators to suppress signal quality variations over time, complicating the system structure.
Innovation Solution
An optical transmission system that converts high-frequency electrical signals into optical signals using an electric-photo conversion device, transmitted through an optical line, and converted back to electrical signals without the need for an optical isolator, by incorporating a low-frequency additional signal generated by an additional signal generation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical isolator is used to suppress signal quality variation, then signal quality stability is improved, but system complexity and cost increase
Solution Approach 1:
The patent removes the optical isolator from the system entirely. Instead of using the isolator to suppress returning light, the invention extracts only the necessary function by using a simple attenuator that achieves the same signal quality stabilization without the complexity of an isolator, thereby resolving the contradiction between reliability and device complexity
Solution Approach 2:
The patent replaces the expensive optical isolator with a simple, low-cost attenuator. This substitution uses a cheaper component that performs the essential function of suppressing signal quality variation without requiring the complex structure of an isolator, thus reducing both cost and system complexity while maintaining signal stability
2Reliability
If an optical isolator is used to suppress signal quality variation, then signal quality stability is improved, but system cost increases
Solution Approach 1:
The patent replaces the expensive optical isolator with a simple, low-cost attenuator. This substitution uses a cheaper component that performs the essential function of suppressing signal quality variation without requiring the complex structure of an isolator, thus reducing both cost and system complexity while maintaining signal stability
3Reliability
If returning light is attenuated with an optical isolator, then signal quality variation is suppressed, but system structure becomes complicated
Solution Approach 1:
The patent removes the optical isolator from the system entirely. Instead of using the isolator to suppress returning light, the invention extracts only the necessary function by using a simple attenuator that achieves the same signal quality stabilization without the complexity of an isolator, thereby resolving the contradiction between reliability and device complexity
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 simplifies the system structure, reduces costs, and effectively suppresses signal quality variations over time by using a low-frequency additional signal to stabilize the signal quality.
Implementation Method 1
an electric-photo conversion device that converts the first electrical signal to the optical signal
Implementation Method 2
an optical-electrical conversion device that converts the optical signal transmitted from the optical transmission line to the second electrical signal
Data Source
AI summary
An optical transmission system converts a first electrical signal to an optical signal, transmits the converted optical signal, and converts the transmitted optical signal to a second electrical signal. The optical transmission system includes an electrical-optical conversion device, an optical transmission line, and an optical-electrical conversion device. The first electrical signal includes a communication signal having a high frequency of more than 10 GHz and 100 GHz or less. The optical transmission system further includes an additional signal generation device that generates a low-frequency additional signal having a frequency of 1. Hz or more and 9 MHz or less. The electrical-optical conversion device converts the first electrical signal including the additional signal generated in the additional signal generation device and the communication signal to an optical signal.