Focusing over Optical Fiber Using Time Reversal

Molly Piels, Edson Porto da Silva, Jose Manuel Estaran Tolosa, Robert Borkowski, Idelfonso Tafur Monroy, Darko Zibar

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A time-reversal array in multimode fiber is proposed for lossless remotely controlled switching using passive optical splitters. The signal to be transmitted is digitally pre-distorted so that it is routed through the physical layer in order to arrive at only one receiver in an array. System performance in the presence of additive white gaussian noise, modal group delay, and timing error is investigated numerically for single-mode and 10-mode fiber. Focusing using a two-transmitter array and 44 km of single- mode fiber is demonstrated experimentally for 3 GBd QPSK signals with a bit error rate below the forward error correction limit.
Original languageEnglish
JournalIEEE Photonics Technology Letters
Issue number6
Pages (from-to)631-634
Publication statusPublished - 2015


  • Optical fiber communication
  • Access networks
  • Digital signal processing

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