Experimental demonstration of pre-electronic dispersion compensation in IM/DD systems using an iterative algorithm

XIONG WU, ABDULLAH S. KARAR, KANGPING ZHONG, ALAN PAK TAO LAU, CHAO LU

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

To combat chromatic dispersion (CD) in intensity modulation and direct detection (IM/DD) systems, three chirp-free demonstrations are experimentally performed with an iterative pre-electronic dispersion compensation (pre-EDC) algorithm at the transmitter end, for 28 GBaud non-return-to-zero on-off keying (NRZ-OOK), 56 GBaud NRZ-OOK and 28 GBaud four-level pulse-amplitude-modulation (PAM-4) signals, over distances of 100 km, 50 km and 40 km of single mode fiber (SMF), respectively. The iterative pre-EDC algorithm is based on the Gerchberg-Saxton (GS) algorithm, which treats the unconstrained phase at the direct detection receiver as a degree of freedom. At the receiver side, only a linear fractionally-spaced (T/2) post-feed-forward equalizer (post-FFE) is employed to combat the residual inter-symbol interference (ISI). Experimental results show that the aforementioned three demonstrations can approach the forward error correction (FEC) bit error rate (BER) threshold of 3.8 × 10-3 with (15 pre-EDC iterations and 5-tap post-FFE), (30 pre-EDC iterations and 15-tap post-FFE), and (10 pre-EDC iterations and 25-tap post-FFE), respectively. The results indicate the applicability of the pre-EDC algorithm in high-capacity IM/DD systems for transmission distances below 100 km of SMF.

Original languageEnglish
Pages (from-to)24735-24748
Number of pages14
JournalOptics Express
Volume29
Issue number16
DOIs
Publication statusPublished - 2 Aug 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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