Optical Transmission Device WSS Control During Signal Interruption
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Solution Overview
Problem
Conventional optical transmission systems experience delays in injecting ASE light after signal interruption, leading to fluctuations in signal light levels and unstable transmission due to the time required for detection and switching, resulting in prolonged convergence of signal levels.
Innovation Solution
An optical transmission device with a wavelength selective switch and controller that switches from constant level control to constant attenuation control during signal interruption, holding the attenuation constant until ASE light is injected, and then returns to constant level control, optimizing WSS control based on the number of interrupted channels and restoring signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If constant level control is used during signal interruption, then signal light output level is maintained, but attenuation amount fluctuates causing unstable transmission
Solution Approach 1:
The patent dynamically switches the control mode of the wavelength selective switch between constant level control and constant attenuation control based on the presence or absence of signal light. When signal light is detected, constant level control is applied; when signal light is interrupted, constant attenuation control is applied. This dynamic adaptation resolves the contradiction by allowing the system to maintain appropriate control characteristics for each operational state.
2Stability of the object's composition
If constant attenuation control is used during signal interruption, then transmission stability is improved, but signal light output level may not converge quickly after restoration
Solution Approach 1:
The patent implements dynamic control mode switching that transitions from constant attenuation control during signal interruption to constant level control after signal restoration. This temporal variation in control strategy allows the system to prioritize stability during interruption while enabling quick convergence after restoration, resolving the time loss issue.
3Reliability
If ASE light injection is delayed due to detection and switching time, then system reliability is maintained, but signal level fluctuations occur during the delay period
Solution Approach 1:
The patent applies constant attenuation control as a preliminary measure during the detection and switching delay period. By maintaining constant attenuation rather than attempting constant level control with insufficient light power, the system prevents excessive signal level fluctuations that would occur during the delay, thereby maintaining both reliability and signal stability.
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 stabilizes signal light levels during interruptions, preventing unnecessary fluctuations and ensuring quick convergence to target levels after ASE light injection, thereby maintaining stable optical transmission.
Implementation Method 1
a wavelength selective switch configured to drop a portion of the signal light on the transmission path and/or add other signal light to the signal light on the transmission path
Implementation Method 2
The ROADM and OXC include an optical amplifier
Implementation Method 3
Each station has an internal amplified spontaneous emission (ASE) light source, whereby ASE light is injected during signal interruption of signal light in a transmission line
Data Source
AI summary
An optical transmission device configured to: receive an input of signal interruption information from a second optical transmission device that detects a signal interruption of signal light on a transmission path, and to receive an input of ASE light after the signal interruption, has a wavelength selective switch configured to drop and/or add signal light; a memory; and a processor coupled to the memory. The processor is configured to: switch, based on the input of the signal interruption information from the second optical transmission device, control of output of the wavelength selective switch from a constant level control of the output, to a constant level control of attenuation for holding an amount of the attenuation of the signal light constant; and return the constant level control of the attenuation to the constant level control of the output, after the input of the ASE light.