Optical Transmission Output Adjustment for Wavelength Signal Balance
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Solution Overview
Problem
In FTTH CATV systems supporting new 4K/8K satellite broadcasts, the output levels of optical signals with different wavelengths may not meet desired reception levels due to varying input levels, leading to incomplete viewing capabilities for existing and new broadcasts.
Innovation Solution
An optical transmission system with an output adjustment unit that adjusts signal intensities of optical signals with different wavelengths to ensure sufficient reception levels, using a multiplexer, filters, and measurement units to calculate and apply necessary adjustments for stable output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an amplifier is used to amplify multiplexed optical signals with different wavelengths, then the total output level can be maintained, but the individual output levels of specific wavelengths cannot be controlled separately
Solution Approach 1:
The patent divides the amplification control into separate segments for each wavelength. Instead of using a single amplifier for the multiplexed signal, the system uses separate amplifiers (first amplifier for first wavelength, second amplifier for second wavelength) that can independently control the output level of each wavelength component, thereby resolving the contradiction between maintaining total output and controlling individual wavelengths.
Solution Approach 2:
The patent introduces dynamic control mechanisms including variable optical attenuators and controllable amplifiers that can adjust their parameters in real-time. The control unit dynamically adjusts the attenuation or amplification of each wavelength based on the other wavelength's power level, enabling independent control of individual wavelength output levels while maintaining overall system performance.
2Power
If the input level of one wavelength varies, then the total input power changes, but the output levels of individual wavelengths become unbalanced
Solution Approach 1:
The patent implements feedback control mechanisms where the output power of one wavelength is monitored and used to adjust the other wavelength's power level. The control unit receives power level information from both wavelengths and dynamically adjusts the variable optical attenuators or amplifiers to maintain balanced output levels, ensuring reliability even when input power varies.
Solution Approach 2:
The patent changes the operating parameters of the optical components (attenuation levels, amplification gains) based on real-time power level measurements. By dynamically adjusting these parameters, the system compensates for input power variations and maintains consistent output levels for each wavelength, resolving the balance issue.
3Ease of manufacture
If existing broadcasting equipment is used without modification, then installation costs are reduced, but the equipment cannot support new 4K/8K satellite broadcasts with different intermediate frequencies
Solution Approach 1:
The patent makes the existing optical transmission system universal by adding components that enable it to handle both old and new broadcast frequencies simultaneously. The WDM multiplexer and separate wavelength paths allow the system to process multiple types of signals (existing broadcasts and new 4K/8K satellite broadcasts) through a single infrastructure, achieving multi-functionality without replacing existing equipment.
Solution Approach 2:
The patent nests new functionality within the existing system architecture. The new 4K/8K broadcast path is nested alongside the existing broadcast path, with both coexisting in the same optical transmission infrastructure. This nested approach allows the system to support new frequencies while maintaining compatibility with existing equipment and minimizing installation costs.
Data Source
AI summary
An optical transmission system includes: a first optical transmitting unit for transmitting a first optical signal having a first wavelength; a second optical transmitting unit for transmitting a second optical signal having a second wavelength; an output adjustment unit for acquiring the first optical signal and the second optical signal, adjusting signal intensities of the acquired optical signals, and outputting the optical signals; a multiplexer for multiplexing the first optical signal and the second optical signal that have been subjected to signal intensity adjustment and outputting a multiplexed signal; an amplifier for amplifying the multiplexed signal; a first optical receiving unit for receiving the amplified first optical signal; and a second optical receiving unit for receiving the amplified second optical signal. The output adjustment unit adjusts the signal intensities of the first optical signal and the second optical signal such that the signal intensity of the first optical signal received by the first optical receiving unit is larger than or equal to a first predetermined value, and the signal intensity of the second optical signal received by the second optical receiving unit is larger than or equal to a second predetermined value.