WDM Frame Segmentation With Header Replication for Low-Latency Reception
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Solution Overview
Problem
In optical transmission/reception systems with short transmission distances, applying conventional WDM transmitters with high coding gain increases transmission delay due to the discarding of frame signals with errors in the header portion, necessitating lengthy re-transmission processes.
Innovation Solution
An optical transmission/reception system that divides data into multiple frames with replicated header information and CRC values, converts each frame into different wavelengths, and synthesizes corrected frames using a frame synthesizing unit to reduce transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional WDM transmitters with high coding gain are applied, then error correction capability is improved, but transmission delay is increased due to lengthy re-transmission processes
Solution Approach 1:
The frame signal is segmented into multiple wavelength channels, with the header portion distributed across multiple wavelengths. This segmentation allows the receiver to reconstruct the header by combining information from multiple channels, enabling faster error detection and re-transmission requests without processing delays associated with conventional single-channel high-gain ECC systems
Solution Approach 2:
The header information is copied and distributed across multiple wavelength channels. By replicating the header in multiple channels, the system enables rapid error detection through CRC verification of individual channels and facilitates quick re-transmission requests when errors are detected, avoiding the lengthy processing delays of conventional high-gain ECC systems
2Reliability
If frame signals with header errors are discarded and re-transmitted, then data integrity is maintained, but transmission delay increases due to the lengthy re-transmission process
Solution Approach 1:
The system implements a feedback mechanism where the receiver verifies CRC values of received frame signals and immediately requests re-transmission when errors are detected. This feedback approach enables rapid error detection and re-transmission initiation, maintaining data integrity while significantly reducing the delay compared to conventional systems that use lengthy high-gain ECC processing
Solution Approach 2:
The header information is preliminarily distributed across multiple wavelength channels with embedded CRC values. This preliminary arrangement enables the receiver to perform quick CRC verification on individual channels and immediately identify errors, facilitating rapid re-transmission requests without the need for complex post-reception error correction processing
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
Suppresses transmission delay by enabling rapid re-transmission requests and efficient error correction, reducing the probability of frame loss and maintaining low frame loss rates.
Implementation Method 1
n optical transmission units which convert n frame signals into optical signals of n wavelengths and transmit the optical signals to an optical transmission path
Data Source
AI summary
In an optical transmitter, an error correction and coding unit performs error correction and coding on data. A framer unit adds header information to n pieces of error-corrected and coded data to generate a frame signal. A frame dividing unit divides the data of the frame signal into n pieces, adds the header information to head of each of the n pieces of divided data, and generates n frame signals obtained by adding different CRC values to end. Optical transmission units convert the n frame signals into optical signals of different wavelengths and transmit them to n optical transmission paths. Optical reception units of an optical receiver receive n optical signals and convert them into n frame signals of electrical signals. A frame synthesizing unit determines whether at least one of the n frame signals has an correct CRC value without an error.