Optical Packet Burst Conversion to Continuous Bitstream
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Solution Overview
Problem
Existing optical packet switching systems face challenges in interconnecting network islands through optical transport networks, as they require converting burst mode optical packet signals into continuous bitstream optical signals for seamless transmission.
Innovation Solution
A method that converts burst mode optical signals into a framed continuous bitstream by filling guard time gaps with a predefined pattern, ensuring the signals align with the payload bitrate of the optical transport network, thereby simplifying the interworking function and allowing for efficient transmission over optical transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If burst mode optical packet signals are transmitted directly through optical transport network, then the packet switching system maintains its burst mode operation, but the optical transport network requires complex conversion and framing operations
Solution Approach 1:
The patent changes the temporal parameter of the optical signal from burst mode to continuous mode by filling guard time gaps with predefined patterns, enabling direct compatibility with optical transport network framing without complex conversion operations
Solution Approach 2:
The patent introduces a simplified intermediary conversion mechanism that transforms burst mode packets into continuous bitstreams by inserting filling patterns during guard times, serving as a bridge between packet switching and optical transport networks
2Reliability
If guard time gaps between optical packets are filled with predefined patterns to create continuous bitstream, then seamless transmission through optical transport network is achieved, but the packet network must enforce bitrate restrictions
Solution Approach 1:
The patent standardizes the bitrate parameter of optical packets to match the payload bitrate of the optical transport network, enabling direct conversion without complex rate adaptation while ensuring reliable continuous transmission
Solution Approach 2:
The patent maintains continuous transmission by filling guard time gaps with predefined patterns, eliminating interruptions in the optical bitstream while the packet network enforces bitrate restrictions to simplify the conversion process
3Device complexity
If optical packets are converted to continuous bitstream by filling guard time gaps, then the conversion process is simplified, but the original packet signal structure is modified
Solution Approach 1:
The patent extracts and removes the guard time gaps from the packet signal structure by filling them with predefined patterns, simplifying the conversion to continuous bitstream while the original packet structure is preserved for later extraction
Solution Approach 2:
The patent temporarily discards the guard time gaps during conversion by replacing them with filling patterns, then recovers the original packet signal structure at the destination by removing the filling patterns and reconstructing the packet boundaries
Data Source
AI summary
A burst mode optical signal is transported as payload of a framed continuous bit-stream optical signal through an optical transport network. The optical bursts are all generated at a common nominal bitrate which equals substantially the payload bitrate of the continuous bit-stream optical signal. The bursts are converted into a continuous bit stream by filling gaps between the bursts with a predefined pattern. The continuous bit stream thus created is then mapped into frames to generate the framed continuous bit-stream optical signal for transmission.