Dual-Fiber Optical Switching With Power Locking for Stable Switchover
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Solution Overview
Problem
In optical communication networks, signal transmission through dual-fed lines can cause optical power fluctuations due to stimulated Raman scattering, leading to crosstalk and reduced communication quality when an optical switch switches between optical fibers, affecting downstream devices.
Innovation Solution
The optical transmission device employs power locking modules and optical switches to stabilize optical power by adjusting split ratios and using optical attenuators to control optical power variations within a target threshold during fiber switching, minimizing power fluctuations and Raman effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical switch switches between optical fibers to protect communication links, then communication reliability is improved, but optical power fluctuation increases causing crosstalk and reduced communication quality
Solution Approach 1:
The patent applies preliminary action by pre-configuring dual-fed optical paths and power locking modules before faults occur. The system prepares backup communication paths and power stabilization mechanisms in advance, enabling rapid switching without power fluctuation when faults occur, thus resolving the contradiction between reliability improvement and harmful power fluctuation
Solution Approach 2:
The patent introduces power locking modules as intermediary devices between the optical switch and downstream devices. These modules act as mediators that detect optical power changes during switching and actively compensate to maintain stable power levels, preventing crosstalk while preserving the fault protection capability
2Length of moving object
If optical power is increased to improve signal transmission, then transmission distance is improved, but stimulated Raman scattering effect increases causing optical power fluctuation
Solution Approach 1:
The patent implements feedback control through power locking modules that continuously monitor optical power levels and adjust transmission parameters in real-time. This feedback mechanism maintains optimal power levels for extended transmission distance while preventing excessive power that would trigger stimulated Raman scattering effects
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting optical power levels, wavelength characteristics, and modulation parameters based on transmission conditions. This enables optimized transmission distance while maintaining power levels below the threshold for stimulated Raman scattering
3Loss of time
If optical switch switching speed is increased to reduce switching time, then fault recovery speed is improved, but optical power transient fluctuation increases causing signal damage
Solution Approach 1:
The patent applies preliminary action by pre-establishing dual-fed optical paths with identical signal characteristics before switching is needed. This preparation enables instantaneous switching without power transients, achieving both fast fault recovery and signal integrity
Solution Approach 2:
The patent maintains continuity of useful action through power locking modules that ensure uninterrupted and stable power delivery during switching transitions. This continuous power stabilization eliminates transients while enabling rapid switching for fast fault recovery
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
Stabilizes optical power at downstream devices, reducing signal damage and maintaining communication quality by efficiently controlling optical power fluctuations during fiber switchovers.
Implementation Method 1
Due to a stimulated Raman scattering effect, fluctuation of optical power of the signal at the upstream optical transmission device causes fluctuation of optical power of the signal at a downstream optical transmission device
Data Source
AI summary
An optical transmission device provides a first power locking module configured to receive a first input signal from a second optical transmission device through a first optical fiber, and output a first output signal, a second power locking module configured to receive a second input signal from the second optical transmission device through a second optical fiber and output a second output signal, and a first optical switch configured to select the first output signal to be connected to a downstream port of the first optical transmission device. If a fault occurs in a communication link on which the first optical fiber is located, the first optical switch switches a signal connected to the downstream port from the first output signal to the second output signal, and controls, during the switching, a variation of optical power at the downstream port to be within a target threshold.