Parallel Precoder Circuit for Ultra-High Speed Optical Communications
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Solution Overview
Problem
Conventional serial precoder circuits in optical communication systems face challenges in achieving high operation speeds, particularly in ultra-high speed optical communication systems, due to difficulties in timing adjustment and increased circuit complexity, which limits their effectiveness in DQPSK systems.
Innovation Solution
A parallel precoder circuit is designed to perform differential encoding operations on n-row parallel input information series, utilizing a network configuration of differential encoding operation circuits and delay circuits to reduce the delay in the feedback route and minimize the number of stages required for operation, thereby enhancing the circuit's speed and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a serial precoder circuit is used to process signals at ultra-high speed (10 Gb/s and 40 Gb/s), then the transmission speed is improved, but the timing adjustment of the one-bit delay circuit becomes difficult and the operation speed requirement for logical circuits increases
Solution Approach 1:
The invention divides the serial precoder circuit into multiple parallel precoder circuits that process data in parallel. Each parallel circuit handles a portion of the input data simultaneously, eliminating the need for a single complex one-bit delay circuit and reducing timing adjustment complexity while maintaining ultra-high transmission speeds
2Device complexity
If a serial precoder circuit is simply developed into parallel precoder circuits, then the operation speed requirement is reduced, but a feedback route passing through multiple serial precoder circuits is generated, requiring high operation speed for each serial precoder circuit
Solution Approach 1:
The invention extracts and eliminates the feedback route that passes through multiple serial precoder circuits by designing a new parallel architecture. The parallel precoder circuits are configured to process data independently without requiring feedback through previous serial stages, thereby reducing the operation speed requirement for each individual serial precoder circuit while maintaining overall system performance
3Speed
If the clock unit time per one bit is reduced to achieve ultra-high speed transmission, then the transmission speed is improved, but the timing adjustment of the one-bit delay circuit becomes more difficult
Solution Approach 1:
By segmenting the processing into multiple parallel circuits, each operating at a relaxed timing, the invention eliminates the need for precise timing adjustment in a single ultra-fast delay circuit. The parallel architecture naturally handles the timing requirements without complex adjustment mechanisms
Data Source
AI summary
A parallel precoder circuit executes a differential encoding operation on an n-row parallel input information series, and outputs an n-row parallel output information series, where 2≦n. Output sets of differential encoding operation circuits each of which having a largest column number from among differential encoding operation circuits disposed in first row to (n−1)th row become first-row to (n−1)th-row parallel outputs information series, and an output set of an nth-row delay circuit becomes nth-row parallel output information series.