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Advanced Optical Channel Coding and Interleaver Design for Robust Data Transmission

This document outlines innovative techniques in optical channel coding and signal interleaving aimed at achieving low bit error rates (BER) in high-speed systems. It details the implementation of Trellis coding, Reed-Solomon error correction, and unique interleaver patterns that address user collisions effectively. The proposed methods allow for uncoordinated access by multiple transmitters while maintaining data integrity through advanced decoding mechanisms. Furthermore, implementation strategies utilizing FPGA and high-speed electronic systems are discussed, demonstrating the efficacy of these designs under real-world conditions.

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Advanced Optical Channel Coding and Interleaver Design for Robust Data Transmission

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  1. Optical OR Channel • Channel Coding • Channel Model • Output 0 if all users transmit 0 • Output 1 if one or more users transmit 1 • Interleaver • Users can be uniquely addressed by interleaver pattern • Trellis Code • Data bits are protected from collisions using a specially designed non-linear code • Reed Solomon Code • Ensures that the final data stream has BER<10-9 tx1 rx1 Star network tx2 rx2 … … txn rxn Uncoordinated Access • Transmitters can transmit at any time using an interleaver chosen from a family without informing anyone except the desired receiver • Interference is assumed De-interleaver OR channel Trellis Decoder Rate:1/20 Reed Solomon Decoder (255,237) 5 other tx

  2. System Implementation Component Integration Optical Receiver Thresholding and Retiming Logical System High Speed Electronic System Optical System Opticalcoupler amplifier Tx-6 4 modulator … laser 3 amplifier Tx-2 modulator 2 1 laser 0 amplifier Tx-1 modulator laser Lightwave detector thresholding retime Rx Logic Implementation • Interleaver: • 1600 bit interleaver • Use novel random write-by-row, read-by, column scheme • Trellis code: • 64 state parallel Viterbi decoding • Heavily pipelined

  3. Interdisciplinary Design • Channel Code Design • Trellis code combined with IDMA to protect against interference • FPGA Logic Design • Novel, parallel and high speed architectures to handle optical rates • Electrical / Optical Design • Six CW lasers intensity modulated with electrical signals Sponsored by Space and Naval Warfare Systems Center – San Diego (N66001-02-1-8938)

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