Optical Transmitter State Feedback for Stable Signal Output
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Solution Overview
Problem
In long-distance optical transmission systems with high speeds, multi-level phase modulation is used to manage chromatic and polarization dispersion, but this increases transmitter complexity and requires time-consuming adjustments, leading to unstable signal output during adjustment stages, which can result in poor communication quality as the receiver may initiate regular operations before the transmitter is fully adjusted.
Innovation Solution
An optical transmission system where the transmitter adds state information to the signal, allowing the receiver to identify the transmitter's state through an Optical Transport Network (OTN) frame, preventing the receiver from proceeding to regular operation until the transmitter is fully adjusted, by including a transmitting section that maps adjustment state information into the OTN frame and a receiving section that identifies this information to control the signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-level phase modulation system is used to reduce symbol rate and improve tolerance to chromatic dispersion or polarization dispersion, then transmission quality is improved, but transmitter complexity increases and adjustment becomes time-consuming
Solution Approach 1:
The patent implements a feedback mechanism where the transmitter sends state information about its adjustment status to the receiver. The receiver uses this feedback to determine whether the transmitter is in adjustment stage or regular operation stage, allowing the receiver to wait for proper signal quality before initiating regular operations. This resolves the contradiction by enabling the system to manage complexity through intelligent coordination between transmitter and receiver.
2Ease of operation
If transmitter adjustment is performed while outputting optical signal, then adjustment can be conducted in real-time, but signal output level becomes unstable and communication quality deteriorates
Solution Approach 1:
The patent applies preliminary action by having the transmitter send state information about its adjustment status to the receiver before the adjustment is completed. The receiver uses this advance information to prepare for proper signal reception, ensuring that regular operations are only initiated after the transmitter has finished adjustment and signal stability is achieved. This prevents communication quality deterioration while allowing flexible adjustment timing.
3Speed
If receiver proceeds to regular operation when main signal is detected, then system response time is reduced, but receiver may initiate operation during adjustment stage when signal quality is poor
Solution Approach 1:
The patent uses feedback from the transmitter to inform the receiver about the transmitter's operational state. The transmitter sends state information indicating whether it is in adjustment stage or regular operation stage. The receiver uses this feedback to make informed decisions about when to proceed to regular operations, preventing premature initiation while maintaining fast system response. This resolves the contradiction by enabling the receiver to wait for proper signal quality without significant delay.
4Reliability
If state information is added to signal for transmitter identification, then receiver can recognize transmitter state, but signal processing complexity increases
Solution Approach 1:
The patent applies segmentation by separating the state information from the main signal data. The state information is transmitted as separate overhead information within the optical signal structure, allowing the receiver to first identify the transmitter state and then process the main signal accordingly. This segmentation approach enables reliable state recognition without significantly increasing overall signal processing complexity, as the state information can be extracted and processed independently.
Data Source
AI summary
An optical transmission system includes transmitter 100 and receiver 200. Transmitter 100 adds state information for identifying a state of transmitter 100, to a signal and transmits the signal to receiver 200. Receiver 200 obtains the state information added to the signal transmitted from transmitter 100 and identifies a state of transmitter 100 based on the obtained state information.