WDM extended reach passive optical networks using OFDM-QAM

Chi-Wai Chow*, Chien Hung Yeh, Chia Hsuan Wang, Fu Yuan Shih, Ci Ling Pan, Sien Chi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


In order to reduce the cost for delivering future broadband services, network operators are inclined to simplify the network architectures by integrating the metro and access networks into a single system. Hence, extended reach passive optical networks (ER-PONs) have been proposed. ER-PON usually has four new features: high data rate in both upstream and downstream signals (>1 Gb/s); reach extension to >100 km; a high split ratio (>100); and using wavelength division multiplexing (WDM). In this work, we propose and demonstrate a highly spectral efficient ER-PON using 4 Gb/s OFDM-QAM for both upstream and downstream signals, while achieving a high split-ratio of 256. The ER-PON employs optical components optimized for GPON (bandwidth of ∼1GHz) and reaches 100 km without dispersion compensation. Numerical analysis using 16, 64 and 256-QAM OFDM are also performed to study the back-to-back receiver sensitivities and power penalties at different electrical driving ratios.

Original languageEnglish
Pages (from-to)12096-12101
Number of pages6
JournalOptics Express
Issue number16
StatePublished - 4 Aug 2008


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