Comparison of Intersymbol Interference Power Penalties for OOK and 4-PAM in Short-Range Optical Links

Author

Szczerba, Krzysztof ; Westbergh, P. ; Agrell, Erik ; Karlsson, Magnus ; Andrekson, Peter A. ; Larsson, A.

Author_Institution

Dept. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

31

Issue

22

fYear

2013

fDate

Nov.15, 2013

Firstpage

3525

Lastpage

3534

Abstract

We present results of experimental and theoretical investigations of intersymbol interference in 4-PAM transmission in short-range optical communications links based on the power penalty. A test link comprised of a directly modulated 850 nm VCSEL with up to 200 m of multimode fiber and direct detection was used. The link bandwidth was below 10 GHz and the maximum achieved data rate with 4-PAM was 44 Gbps over 100 m of fiber. In the same case and at similar sensitivity, only 32 Gbps could be achieved with OOK. If typical forward error correction could be applied, the sensitivity of the 4-PAM system was improved by up to 4 dB, reaching -10 dBm at 25 Gbps.

Keywords

amplitude shift keying; forward error correction; intersymbol interference; optical communication equipment; optical fibre communication; optical modulation; surface emitting lasers; 4-PAM; OOK; VCSEL; bit rate 25 Gbit/s; bit rate 32 Gbit/s; bit rate 44 Gbit/s; direct detection; forward error correction; intersymbol interference power penalties; multimode fiber; short-range optical communications links; wavelength 850 nm; Bit error rate; Frequency measurement; Modulation; Optical fiber communication; Optical sensors; Sensitivity; Vertical cavity surface emitting lasers; 4-PAM; 850 nm; IM/DD; MMF; OOK; VCSEL; data communications; fiber-optical communications; interconnects intersymbol interference; short-range;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2013.2285468

Filename

6634222