APD-based delay-division-multiplexing OFDM-PONs

Jhih Hao Hsu, Min Yu, Chia-Chien, Chi Hsiang Lin, Chun-Ting Lin, Fumin Liu, Lei Zhou, Liming Fang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Based on pre-Allocated relative sampling delays among optical network users (ONUs) in an orthogonal frequency-division multiplexing (OFDM) passive optical network (PON), the delay-division-multiplexing (DDM) technique employs signal pre-processing to enable demand data to be received by sub-Nyquist analog-to-digital sampling. This work employed an avalanche photodiode (APD) in a DDM-OFDM-PON to achieve higher loss budget, compared to a p-i-n photodiode (PIN). To successfully enable the pre-processing, however, the knowledge of channel response is required; thus, it is critical to estimate complete channel response in DDM-OFDM systems under the constraint of sub-Nyquist sampling. To avoid spectral overlapping in channel estimation, the subcarriers of training symbols in different frequency zones are allocated to different time slots. Unfortunately, this scheme may sustain inaccurate channel estimation due to different degrees of APD saturation for training subcarriers at different frequency zones, leading to significant penalty in performance. Thus, careful control of electrical driving power and optical received power for the training symbols will be important to reduce the impact of saturation on channel estimation, thereby improving transmission performance. We experimentally examined the impact of the accuracy of channel estimation in a 25-Gbps APD-based OFDM-PON. Compared to a PIN, we successfully demonstrated the DDM scheme based on an APD and 1/32 of Nyquist rate with 5-dB improvement in sensitivity after 25-km fiber transmission.

Original languageEnglish
Title of host publication2018 27th Wireless and Optical Communication Conference, WOCC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781538649596
StatePublished - 4 Jun 2018
Event27th Wireless and Optical Communication Conference, WOCC 2018 - Hualien, Taiwan
Duration: 30 Apr 20181 May 2018

Publication series

Name2018 27th Wireless and Optical Communication Conference, WOCC 2018


Conference27th Wireless and Optical Communication Conference, WOCC 2018


  • APD
  • Modulation
  • Multiplexing
  • OFDM
  • PON

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