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.

© 2013 IEEE

4-PAM for High-Speed Short-Range Optical Communications

Krzysztof Szczerba, Petter Westbergh, Johnny Karout, Johan S. Gustavsson, Åsa Haglund, Magnus Karlsson, Peter A. Andrekson, Erik Agrell, and Anders Larsson
J. Opt. Commun. Netw. 4(11) 885-894 (2012)

30 Gbps 4-PAM transmission over 200 m of MMF using an 850 nm VCSEL

Krzysztof Szczerba, Petter Westbergh, Johnny Karout, Johan Gustavsson, Åsa Haglund, Magnus Karlsson, Peter Andrekson, Erik Agrell, and Anders Larsson
Opt. Express 19(26) B203-B208 (2011)

Four 45 Gbps PAM4 VCSEL based transmission through 300 m wideband OM4 fiber over SWDM4 wavelength grid

Reza Motaghiannezam, Ilya Lyubomirsky, Henry Daghighian, Chris Kocot, Timo Gray, Jim Tatum, Adrian Amezcua-Correa, M. Bigot-Astruc, D. Molin, F. Achten, and P. Sillard
Opt. Express 24(15) 17193-17199 (2016)

Single-mode VCSEL for pre-emphasis PAM-4 transmission up to 64  Gbit/s over 100–300  m in OM4 MMF

Hsuan-Yun Kao, Cheng-Ting Tsai, Shan-Fong Leong, Chun-Yen Peng, Yu-Chieh Chi, Huai-Yung Wang, Hao-Chung Kuo, Chao-Hsin Wu, Wood-Hi Cheng, and Gong-Ru Lin
Photon. Res. 6(7) 666-673 (2018)

Experimental comparison of modulation formats in IM/DD links

Krzysztof Szczerba, Johnny Karout, Petter Westbergh, Erik Agrell, Magnus Karlsson, Peter Andrekson, and Anders Larsson
Opt. Express 19(10) 9881-9889 (2011)