DWDM Optical Channel Flatness Control via Power Attenuation
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Solution Overview
Problem
High-performance DWDM systems face challenges in ensuring transmission performance due to non-flatness of optical channels caused by fiber loss and optical amplifier gain variations, leading to decreased signal-to-noise ratio and loss of effective information.
Innovation Solution
A method to adjust signal flatness by determining non-compliant optical channels and adjusting power attenuation until the signal meets predetermined thresholds, using wavelength selectors (WSS) to divide channels into sub-channels and optical amplifiers to compensate for losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If optical amplifiers are used to compensate for fiber loss in DWDM systems, then signal transmission distance is extended, but gain variations cause non-flatness in optical channels
Solution Approach 1:
The patent segments the optical channel adjustment into multiple independent control steps. The WSS (Wavelength Selective Switch) divides the optical spectrum into multiple wavelength channels, and each channel's power attenuation is adjusted independently through a series of discrete steps until the signal flatness meets the predetermined threshold, resolving the non-flatness caused by amplifier gain variations.
Solution Approach 2:
The patent implements a feedback control mechanism where the signal flatness is continuously monitored and compared against a predetermined threshold. Based on the detection results, the power attenuation of target optical channels is adjusted iteratively. This closed-loop feedback process ensures that the optical channel flatness is maintained within acceptable ranges despite amplifier gain variations.
2Reliability
If power attenuation is adjusted to improve signal flatness, then transmission performance is enhanced, but system complexity increases
Solution Approach 1:
The patent enables the DWDM system to automatically detect and adjust its own signal flatness without external intervention. The system autonomously monitors optical channel power levels, identifies channels exceeding the predetermined threshold, and adjusts their attenuation accordingly. This self-service capability enhances transmission performance while avoiding the need for complex external adjustment equipment.
Solution Approach 2:
The patent adjusts the power attenuation parameter of optical channels to optimize signal flatness. By changing this physical parameter within a controlled range and monitoring its effect on transmission performance, the system achieves improved reliability without requiring fundamental architectural changes or additional complex components.
Data Source
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AI summary
Provided in the embodiment of the present application are a signal flatness adjustment method, an electronic device and a computer-readable medium. The method comprises: determining signal flatness of each optical channel among a plurality of optical channels of a multiplex section to be adjusted in a DWDM system; taking an optical channel, the signal flatness of which does not meet a predetermined threshold, among the plurality of optical channels as a target optical channel; and adjusting a power attenuation amount of the target optical channel until the signal flatness of an optical signal which is transmitted by means of the target optical channel meets the predetermined threshold.