Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 38,
  • Issue 21,
  • pp. 5981-5990
  • (2020)

Direct Detection of Bipolar Pulse Amplitude Modulation

Not Accessible

Your library or personal account may give you access

Abstract

Pulse amplitude modulation (PAM) is a widely employed digital modulation format. PAM formats are generally classified as bipolar PAM (BPAM) if using both positive and negative amplitude levels, and unipolar PAM (UPAM) if using only non-negative amplitude levels. While BPAM formats are in principle more energy efficient, they are not compatible with conventional direct detection (DD) schemes, so that UPAM formats are usually preferred for short-reach optical communications. In this work, we propose a novel DD scheme that employs oversampling at two samples per symbol to extract both the amplitude and phase information from the received optical signal, enabling the detection of BPAM signals. The proposed scheme uses a single photodetector, has no special requirements in terms of bandwidth, and requires only some minimal additional processing compared to a conventional scheme. A theoretical analysis, confirmed by numerical simulations, shows that, in the presence of optical amplifier noise, the proposed BPAM/DD transmission technique provides large optical signal-to-noise ratio gains compared to a more conventional UPAM/DD transmission and a good tolerance to group velocity dispersion and non-ideal filtering.

PDF Article
More Like This
Layered ACO-OFDM for intensity-modulated direct-detection optical wireless transmission

Qi Wang, Chen Qian, Xuhan Guo, Zhaocheng Wang, David G. Cunningham, and Ian H. White
Opt. Express 23(9) 12382-12393 (2015)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved