Optical signal impairment study of cascaded optical filters in 40 Gbps DQPSK and 100 Gbps PM-DQPSK systems

Chen, Xiaoyong and Rodriguez Horche, Paloma and Martín Minguez, Alfredo (2013). Optical signal impairment study of cascaded optical filters in 40 Gbps DQPSK and 100 Gbps PM-DQPSK systems. In: "Optics and Photonics for Information Processing VII", 28/08/2013 - 29/08/2013, San Diego, California, EE. UU. pp. 1-12. https://doi.org/10.1117/12.2021521.

Description

Title: Optical signal impairment study of cascaded optical filters in 40 Gbps DQPSK and 100 Gbps PM-DQPSK systems
Author/s:
  • Chen, Xiaoyong
  • Rodriguez Horche, Paloma
  • Martín Minguez, Alfredo
Item Type: Presentation at Congress or Conference (Article)
Event Title: Optics and Photonics for Information Processing VII
Event Dates: 28/08/2013 - 29/08/2013
Event Location: San Diego, California, EE. UU
Title of Book: Proceedings of the SPIE
Date: 2013
Volume: 8855
Subjects:
Freetext Keywords: Optical filter, optical communication, differential quadrature phase shift keying (DQPSK), polarization multiplexed differential quadrature phase shift keying (PM-DQPSK), signal impairment
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica y Bioingeniería
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Optical filters are crucial elements in optical communications. The influence of cascaded filters in the optical signal will affect the communications quality seriously. In this paper we will study and simulate the optical signal impairment caused by different kinds of filters which include Butterworth, Bessel, Fiber Bragg Grating (FBG) and Fabry-Perot (FP). Optical signal impairment is analyzed from an Eye Opening Penalty (EOP) and optical spectrum point of view. The simulation results show that when the center frequency of all filters aligns with the laser’s frequency, the Butterworth has the smallest influence to the signal while the F-P has the biggest. With a -1dB EOP, the amount of cascaded Butterworth optical filters with a bandwidth of 50 GHz is 18 in 40 Gbps NRZ-DQPSK systems and 12 in 100 Gbps PMNRZ- DQPSK systems. The value is reduced to 9 and 6 respectively for Febry-Perot optical filters. In the situation of frequency misalignment, the impairment caused by filters is more serious. Our research shows that with a frequency deviation of 5 GHz, only 12 and 9 Butterworth optical filters can be cascaded in 40 Gbps NRZ-DQPSK and 100 Gbps PM-NRZ-DQPSK systems respectively. We also study the signal impairment caused by different orders of the Butterworth filter model. Our study shows that although the higher-order has a smaller clipping effect in the transmission spectrum, it will introduce a more serious phase ripple which seriously affects the signal. Simulation result shows that the 2nd order Butterworth filter has the best performance.

More information

Item ID: 36340
DC Identifier: http://oa.upm.es/36340/
OAI Identifier: oai:oa.upm.es:36340
DOI: 10.1117/12.2021521
Deposited by: Memoria Investigacion
Deposited on: 29 Jul 2015 18:58
Last Modified: 29 Jul 2015 18:58
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