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Proceedings Paper

Investigation of mode partition noise in Fabry-Perot laser diode
Author(s): Qingyi Guo; Lanxin Deng; Jianwei Mu; Xun Li; Wei-Ping Huang
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Paper Abstract

Passive optical network (PON) is considered as the most appealing access network architecture in terms of cost-effectiveness, bandwidth management flexibility, scalability and durability. And to further reduce the cost per subscriber, a Fabry-Perot (FP) laser diode is preferred as the transmitter at the optical network units (ONUs) because of its lower cost compared to distributed feedback (DFB) laser diode. However, the mode partition noise (MPN) associated with the multi-longitudinal-mode FP laser diode becomes the limiting factor in the network. This paper studies the MPN characteristics of the FP laser diode using the time-domain simulation of noise-driven multi-mode laser rate equation. The probability density functions are calculated for each longitudinal mode. The paper focuses on the investigation of the k-factor, which is a simple yet important measure of the noise power, but is usually taken as a fitted or assumed value in the penalty calculations. In this paper, the sources of the k-factor are studied with simulation, including the intrinsic source of the laser Langevin noise, and the extrinsic source of the bit pattern. The photon waveforms are shown under four simulation conditions for regular or random bit pattern, and with or without Langevin noise. The k-factors contributed by those sources are studied with a variety of bias current and modulation current. Simulation results are illustrated in figures, and show that the contribution of Langevin noise to the k-factor is larger than that of the random bit pattern, and is more dominant at lower bias current or higher modulation current.

Paper Details

Date Published: 25 September 2014
PDF: 9 pages
Proc. SPIE 9288, Photonics North 2014, 928816 (25 September 2014);
Show Author Affiliations
Qingyi Guo, McMaster Univ. (Canada)
Lanxin Deng, McMaster Univ. (Canada)
Jianwei Mu, Massachusetts Institute of Technology (United States)
Xun Li, McMaster Univ. (Canada)
Wei-Ping Huang, Shandong Univ. (China)

Published in SPIE Proceedings Vol. 9288:
Photonics North 2014
Steve MacLean; David V. Plant, Editor(s)

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