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Transmission Performance of 40 Gb/s PM Duobinary Signals due to Fiber Nonlinearities in DWDM Systems Using VSB Filtering Techniques

Authors
Jang, HodeokKim, KyoungsooLee, JaehoonJeong, Jichai
Issue Date
9월-2009
Publisher
OPTICAL SOC KOREA
Keywords
Duobinary signals; Phase-modulated duobinary; Wavelength-division multiplexing; Vestigial sideband filtering
Citation
JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.13, no.3, pp.354 - 360
Indexed
SCIE
SCOPUS
KCI
Journal Title
JOURNAL OF THE OPTICAL SOCIETY OF KOREA
Volume
13
Number
3
Start Page
354
End Page
360
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/119405
DOI
10.3807/JOSK.2009.13.3.354
ISSN
1226-4776
Abstract
We investigate theoretically the tolerance, of 40 Gbps phase-modulated (PM) duobinary signals using a vestigial sideband (VSB) filter on impairments which occurred in dense wavelength-division multiplexing (DWDM) systems, compared to the conventional duobinary signals. Our simulation results show that PM duobinary signals can't have the gain on the spectral efficiency achieved by utilizing the VSB filtering technique. In order to increase the spectral efficiency, they indispensably require to be transmitted at the optimum bandwidth of multiplexer (MUX) and demultiplexer (DEMUX) since they are susceptible to inter-channel crosstalk. It is also shown that the PM duobinary modulation format has a large tolerance oil self-phase modulation (SPM) and cross-phase modulation (XPM) under the condition which MUX and DEMUX have been tuned at all optimum bandwidth; it has 1.2 dB power penalty at the fiber launching power (FLP) of 15 dBm and the channel spacing of 50 GHz.
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