Optical Receiver Linearity Correction During Live Signal Transmission
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Solution Overview
Problem
Existing digital optical receivers struggle to adaptively correct dynamic linearity degradation in the analog front end unit without interrupting signal conduction, as the background art techniques are inadequate for monitoring and correcting varying linearity due to environmental changes and signal intensity variations.
Innovation Solution
A digital optical receiver is designed with a photoelectric conversion unit, an analog front end unit, a linearity correction unit, and a control unit that applies an offset signal and monitors its effect to dynamically correct the linearity of the digital electric signal, allowing for adaptive linearity correction without interrupting signal conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static linearity correction is performed using background art techniques, then linearity degradation can be compensated under stable conditions, but the system cannot adapt to dynamic linearity changes caused by environmental variations and signal intensity changes
Solution Approach 1:
The patent implements feedback by continuously monitoring the transfer characteristic of the analog front end unit and dynamically adjusting the linearity correction parameters based on the monitored information. This allows the system to adapt to environmental variations and signal intensity changes without requiring complex manual intervention or system redesign.
Solution Approach 2:
The patent transitions from static linearity correction to dynamic correction by enabling the linearity correction unit to continuously update its correction characteristics in real-time. This dynamic approach allows the system to track and compensate for time-varying linearity degradation caused by environmental factors and operating condition changes.
2Productivity
If traditional linearity correction methods are used, then correction can be performed when the system is idle, but signal conduction must be interrupted for measurement and correction
Solution Approach 1:
The patent applies preliminary action by performing linearity correction continuously in the background during normal signal conduction, rather than waiting for idle periods. The system proactively monitors and corrects linearity degradation as it occurs, eliminating the need to interrupt signal transmission for maintenance operations.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining both signal conduction and linearity correction operations simultaneously. The correction process runs continuously in the background without interrupting the primary signal transmission function, thereby maximizing system productivity and availability.
3Productivity
If multilevel modulation techniques are applied to increase transmission capacity, then transmission band utilization efficiency improves, but signal waveform complexity increases requiring higher signal accuracy
Solution Approach 1:
The patent applies beforehand cushioning by implementing continuous linearity correction to prevent signal quality degradation before it affects transmission performance. By proactively compensating for linearity variations in the analog front end unit, the system maintains the high signal accuracy required for multilevel modulation techniques, thereby enabling increased transmission capacity without sacrificing signal integrity.
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
The solution enables adaptive correction of linearity degradation in the analog front end unit, maintaining satisfactory signal quality and system performance even with dynamic changes, without requiring static measurement or interruption of signal conduction.
Implementation Method 1
a photoelectric conversion unit that converts an optical signal into an analog electric signal
Data Source
AI summary
A digital optical receiver capable of adaptively correcting the linearity of an analog front end unit is provided. The digital optical receiver comprises: a photoelectric conversion unit that converts an optical signal into an analog electric signal and outputs the analog electric signal; an analog front end unit that converts the analog electric signal obtained from the photoelectric conversion unit into a digital electric signal and outputs the digital electric signal; a linearity correction unit that corrects the linearity of the digital electric signal obtained from the analog front end unit; a demodulation processing unit that demodulates a signal by using, as input, the digital electric signal obtained from the linearity correction unit; and a control unit that provides an offset signal to the analog electric signal outputted by the photoelectric conversion unit, obtains monitor information for the result of the provision of the offset signal, and controls the linearity correction unit so that the linearity correction unit corrects the linearity of the digital electric signal obtained from the analog front end unit on the basis of the monitor information.