Comparison of Orthogonal Frequency-Division Multiplexing and ON―OFF Keying in Direct-Detection Multimode Fiber Links
In: Journal of lightwave technology, Jg. 29 (2011), Heft 13-16, S. 2299-2309
Online
academicJournal
- print, 19 ref
Zugriff:
We compare the performance of several direct-detection orthogonal frequency-division multiplexing (OFDM) schemes to that of ON-OFF keying (OOK) in combating modal dispersion in multimode fiber links. We review known OFDM techniques, including dc-clipped OFDM (DC-OFDM), asymmetrically clipped optical OFDM (ACO-OFDM) and pulse-amplitude modulated discrete multitone (PAM-DMT). We describe an iterative procedure to achieve optimal power allocation for DC-OFDM and compare analytically the performance of ACO-OFDM and PAM-DMT. We also consider unipolar M-ary pulse-amplitude modulation (M-PAM) with minimum mean-square error decision-feedback equalization (MMSE-DFE). For each technique, we quantify the optical power required to transmit at a given bit rate in a variety of multimode fibers. For a given symbol rate, we find that unipolar M-PAM with MMSE-DFE has a better power performance than all OFDM formats. Furthermore, we observe that the difference in performance between M-PAM and OFDM increases as the spectral efficiency increases. We also find that at a spectral efficiency of 1 bit/s/Hz, OOK performs better than ACO-OFDM using a symbol rate twice that of OOK. At higher spectral efficiencies, M-PAM performs only slightly better than ACO-OFDM using twice the symbol rate, but requires less electrical bandwidth and can employ analog-to-digital converters at a speed only 81 % of that required for ACO-OFDM.
Titel: |
Comparison of Orthogonal Frequency-Division Multiplexing and ON―OFF Keying in Direct-Detection Multimode Fiber Links
|
---|---|
Autor/in / Beteiligte Person: | BARROS, Daniel J. F ; KAHN, Joseph M |
Link: | |
Zeitschrift: | Journal of lightwave technology, Jg. 29 (2011), Heft 13-16, S. 2299-2309 |
Veröffentlichung: | New York, NY: Institute of Electrical and Electronics Engineers, 2011 |
Medientyp: | academicJournal |
Umfang: | print, 19 ref |
ISSN: | 0733-8724 (print) |
Schlagwort: |
|
Sonstiges: |
|