All-optical signal processing of fiber impairments in dual-polarization 112 Gbit/s m-ary QAM coherent transmission

Rameez Asif, Muhammad Khawar Islam, Muhammad Zafrullah

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We have numerically implemented a receiver side all-optical signal processing method, i.e. optical backward propagation (OBP), by dispersion compensating fiber (DCF) and non-linear compensator (NLC) devised by effective negative Kerr non-linear coefficient using two highly non-linear fibers (HNLFs). The method is implemented for the post-processing of fiber transmission impairments, i.e. chromatic dispersion (CD) and non-linearities (NL). The OBP module is evaluated for dual-polarization (DP) m-ary (m=4, 16, 32, 64, 256) quadrature amplitude modulation (QAM) in 112 Gbit/s coherent transmission over 1200 km standard single mode fiber (SMF). We have also investigated an intensity limited optical backward propagation module (IL-OBP) by using a self-phase modulation-based optical limiter with an appropriate pre-chirping to compensate for the intensity fluctuations in the transmission link. Our results show that in highly non-linear sensitive 256QAM transmission, we have observed a 66% increase in the transmission distance by implementing IL-OBP as compared to conventional OBP.

Original languageEnglish
Pages (from-to)57-62
Number of pages6
JournalJournal of the Optical Society of Korea
Issue number1
Publication statusPublished - 2013


  • Coherent transmission
  • Fiber optic communication
  • Modulation
  • Single mode fiber

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