Differential Encoding Optical Transceiver Signal Decoding
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Solution Overview
Problem
Conventional multi-level modulation optical transmission and reception devices face issues with correct decoding of differential coded signals due to skew correction, lane exchange, and barrel shift operations being performed simultaneously, leading to incorrect differential decoding.
Innovation Solution
A differential code optical transmission and reception device is designed with a skew correction part, a differential decoder, and a lane exchange part that rearranges electrical signals, allowing differential decoding to occur before lane rotation, ensuring correct signal reception and decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If skew correction, lane exchange, and barrel shift operations are performed simultaneously in conventional devices, then signal transmission can be handled, but differential decoding accuracy deteriorates due to incorrect signal states at decoding boundaries
Solution Approach 1:
The patent segments the signal processing operations into distinct stages: skew correction is performed first on the received signal, then differential decoding is performed on the skew-corrected signal, and finally lane exchange and barrel shift operations are performed on the decoded signal. This segmentation prevents the interference between simultaneous operations and ensures accurate differential decoding by maintaining proper signal states at decoding boundaries.
Solution Approach 2:
The patent applies preliminary skew correction to the received signal before performing differential decoding. By correcting the skew in advance, the signal is prepared in the proper state for accurate differential decoding, preventing the decoding errors that would occur if decoding were performed on uncorrected signals with misaligned lanes.
2Ease of operation
If barrel shift is carried out before differential decoding, then lane exchange can be corrected, but differential decoding fails because signals from different lanes are incorrectly paired at frame boundaries
Solution Approach 1:
The patent inverts the conventional processing order by performing differential decoding before lane exchange and barrel shift operations. Instead of correcting lanes first and then decoding, the patent decodes the signals in their current lane configuration and then performs the lane rearrangement operations on the decoded data, which eliminates the incorrect signal pairing problem at frame boundaries.
3Device complexity
If multiple signal processing operations are combined in a single processing stage, then device complexity is reduced, but signal processing accuracy deteriorates
Solution Approach 1:
The patent divides the signal processing into multiple sequential stages with clear functional boundaries: a skew correction stage, a differential decoding stage, and a lane exchange/barrel shift stage. This segmentation allows each stage to be optimized for its specific function, ensuring high processing accuracy while maintaining manageable device complexity through modular architecture.
Data Source
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AI summary
In an optical communication system which transmits and receives information data by converting it into an optical signal, there is obtained a differential code optical transmission and reception device which can decode a differentially encoded signal in a correct manner by receiving signals correctly irrespective of whether the signals to be used are differentially encoded or not. The device is provided with a digital signal processing optical transceiver (20) that converts information data into an optical signal and transmits it to a communication channel (2), a reception front end part (24) that receives the optical signal from the communication channel (2), an O/E conversion part (29) that converts the optical signal received from the communication channel (2) into an electrical signal, a skew correction part (15) that regulates or correct a skew between lanes contained in the electrical signal, a differential decoder (16) that decodes a differential code of the skew corrected electrical signal, and a lane exchange / rotation part (17) that rearranges the electrical signal having passed through the differential decoder (16) into a lane state thereof at the time of transmission in cases where lane exchange has occurred in the communication channel (2).