Experimental Investigations of 3-D-/4-D-CAP Modulation With Directly Modulated VCSELs

Author

Othman, M.B. ; Xu Zhang ; Lei Deng ; Wieckowski, Michael ; Jensen, J.B. ; Monroy, I.T.

Author_Institution

Dept. of Photonics Eng., Tech. Univ. of Denmark (DTU), Lyngby, Denmark

Volume

24

Issue

22

fYear

2012

Firstpage

2009

Lastpage

2012

Abstract

In this letter, we present experimental investigations of multidimensional multilevel carrierless amplitude phase (CAP) modulation with directly modulated vertical cavity surface-emitting lasers. The signals are transmitted over 20 km of standard single-mode fiber (SSMF). For multilevel 3-D-CAP, bit rates of 468.75 and 937.5 Mb/s are achieved at two levels/dimension and four levels/dimension, respectively. For 4-D-CAP, bit rates of 416.67 and 833.3 Mb/s are achieved at two levels/dimension and four levels/dimension, respectively. For all signals, a bit-error rate below the forward error correction limit of 2.8 × 10^-3 for error-free reception is achieved after 20 km of SSMF transmission. Spectral efficiencies of 2.68 and 2.08 b/s/Hz are reported for 3-D-CAP and 4-D-CAP, respectively. We believe that multidimensional modulation formats represent an attractive solution for providing more flexibility for optical fiber systems.

Keywords

amplitude modulation; error statistics; forward error correction; laser cavity resonators; optical communication equipment; optical fibre communication; optical modulation; phase modulation; semiconductor lasers; surface emitting lasers; SSMF transmission; bit rate 416.67 Mbit/s to 937.5 Ebit/s; bit-error rate; directly modulated VCSEL; directly modulated vertical cavity surface-emitting lasers; distance 20 km; error-free reception; forward error correction limit; mulitlevel 3D-CAP modulation; mulitlevel 4D-CAP modulation; multidimensional multilevel carrierless amplitude phase modulation; optical fiber systems; signal transmission; spectral efficiencies; standard single-mode fiber; Modulation; Optical filters; Optical transmitters; Receivers; Time frequency analysis; Transceivers; Vertical cavity surface emitting lasers; Carrierless amplitude and phase; multilevel multidimensional modulation; vertical-cavity surface-emitting laser (VCSEL) optical communication;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2217811

Filename

6297442