By Topic

Auto Bias Control Technique Based on Asymmetric Bias Dithering for Optical QPSK Modulation

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Hiroto Kawakami ; NTT Network Innovation Laboratories, NTT Corporation, Yokosuka, Japan ; Eiji Yoshida ; Yutaka Miyamoto

This paper describes a simple and highly sensitive auto bias control (ABC) technique based on asymmetric bias dithering for optical quadrature phase shift keying (QPSK) modulation and QPSK variants. Using our asymmetric bias dithering proposal, the required bandwidth of the ABC circuit is only dc ~ 2fd, where fd is the frequency of dithering, fd <; 1 kHz. Thus, the circuit can be constructed without using high-speed components, and bias control performance is not limited by the signal bit rate. In this paper, we detail the concept of asymmetric bias dithering. We describe experiments that confirm bias monitoring and ABC operation, using a 20-64 Gbit/s optical QPSK signal. Its typical penalty is 0.1 dB, and Q factor fluctuation is negligible over 6 h of operation.

Published in:

Journal of Lightwave Technology  (Volume:30 ,  Issue: 7 )