TY - JOUR
T1 - An efficient stabilization process for analog fractionally spaced equalizers
AU - Faig, Hananel
AU - Sadot, Dan
AU - Gantz, Liron
AU - Cohen, Shai
N1 - Funding Information:
Manuscript received February 5, 2019; revised February 24, 2019; accepted March 1, 2019. Date of publication March 8, 2019; date of current version April 22, 2019. This work was supported in part by the Peta-Cloud Consortium and in part by Mellanox Technologies Ltd. (Shai Cohen contributed equally to this work.) (Corresponding author: Hananel Faig.) H. Faig is with Mellanox Technologies Ltd., Yokneam Illit, Israel, and also with the Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, Beer-Sheva, Israel (e-mail: faig@post.bgu.ac.il).
Publisher Copyright:
© 1989-2012 IEEE.
PY - 2019/5/1
Y1 - 2019/5/1
N2 - An analog fractionally spaced equalizer (FSE) is an efficient solution for high-speed communication system without a clock and data recovery circuit. However, the FSE might become unstable when a sign-sign least mean square tuning algorithm is used, especially when the transmitter pre-distortion is used. Here, an analytical model of the instability is derived, and a low-cost and efficient stabilization process based on dithering is proposed. The analytical instability model is verified in an experimental setup based on a vertical cavity surface emitting laser. Furthermore, it is experimentally demonstrated that in the case of the instability of the FSE, a clear convergence is achieved when applying the proposed stabilization scheme.
AB - An analog fractionally spaced equalizer (FSE) is an efficient solution for high-speed communication system without a clock and data recovery circuit. However, the FSE might become unstable when a sign-sign least mean square tuning algorithm is used, especially when the transmitter pre-distortion is used. Here, an analytical model of the instability is derived, and a low-cost and efficient stabilization process based on dithering is proposed. The analytical instability model is verified in an experimental setup based on a vertical cavity surface emitting laser. Furthermore, it is experimentally demonstrated that in the case of the instability of the FSE, a clear convergence is achieved when applying the proposed stabilization scheme.
KW - Optical fiber communication
KW - analog equalizer
KW - dither
KW - fractionally-spaced equalizer
UR - http://www.scopus.com/inward/record.url?scp=85065096365&partnerID=8YFLogxK
U2 - 10.1109/LPT.2019.2903275
DO - 10.1109/LPT.2019.2903275
M3 - Article
AN - SCOPUS:85065096365
SN - 1041-1135
VL - 31
SP - 665
EP - 668
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 9
M1 - 8663418
ER -