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Optical Engineering • Open Access

Pulsed laser-based optical frequency comb generator for high capacity wavelength division multiplexed passive optical network supporting 1.2 Tbps
Author(s): Rahat Ullah; Bo Liu; Qi Zhang; Muhammad Saad Khan; Ibrar Ahmad; Amjad Ali; Razaullah Khan; Qinghua Tian; Cheng Yan; Xiangjun Xin

Paper Abstract

An architecture for flattened and broad spectrum multicarriers is presented by generating 60 comb lines from pulsed laser driven by user-defined bit stream in cascade with three modulators. The proposed scheme is a cost-effective architecture for optical line terminal (OLT) in wavelength division multiplexed passive optical network (WDM-PON) system. The optical frequency comb generator consists of a pulsed laser in cascade with a phase modulator and two Mach–Zehnder modulators driven by an RF source incorporating no phase shifter, filter, or electrical amplifier. Optical frequency comb generation is deployed in the simulation environment at OLT in WDM-PON system supports 1.2-Tbps data rate. With 10-GHz frequency spacing, each frequency tone carries data signal of 20 Gbps-based differential quadrature phase shift keying (DQPSK) in downlink transmission. We adopt DQPSK-based modulation technique in the downlink transmission because it supports 2 bits per symbol, which increases the data rate in WDM-PON system. Furthermore, DQPSK format is tolerant to different types of dispersions and has a high spectral efficiency with less complex configurations. Part of the downlink power is utilized in the uplink transmission; the uplink transmission is based on intensity modulated on-off keying. Minimum power penalties have been observed with excellent eye diagrams and other transmission performances at specified bit error rates.

Paper Details

Date Published: 9 September 2016
PDF: 10 pages
Opt. Eng. 55(9) 096106 doi: 10.1117/1.OE.55.9.096106
Published in: Optical Engineering Volume 55, Issue 9
Show Author Affiliations
Rahat Ullah, Beijing Univ. of Posts and Telecommunications (China)
Sarhad Univ. (Pakistan)
Bo Liu, Beijing Univ. of Posts and Telecommunications (China)
Qi Zhang, Beijing Univ. of Posts and Telecommunications (China)
Muhammad Saad Khan, Beijing Univ. of Posts and Telecommunications (China)
Ibrar Ahmad, Beijing Univ. of Posts and Telecommunications (China)
Amjad Ali, Sarhad Univ. of Science and Technology (Pakistan)
Razaullah Khan, Beijing Univ. of Posts and Telecommunications (China)
Qinghua Tian, Beijing Univ. of Posts and Telecommunications (China)
Cheng Yan, Tsinghua Univ. (China)
Xiangjun Xin, Beijing Univ. of Posts and Telecommunications (China)


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