Abstract
We propose and demonstrate a flexible optical clock recovery scheme using
a polarization-modulator-based frequency-doubling optoelectronic oscillator
(OEO). The proposed system can extract both prescaled clock and line-rate
clock from a degraded high-speed digital signal using only low-frequency
devices. A simple theory is developed to study the physical basis of the
optical clock recovery. The OEO operation from a free-running mode to an
injection-locking mode is investigated. The locking range is quantitatively
predicted. An experiment is then implemented to verify the proposed scheme.
A prescaled clock at 10 GHz and a line-rate clock at 20 GHz are successfully
extracted from a degraded 20 Gb/s optical time-division-multiplexed (OTDM)
signal. The locking range and the phase noise performance are also
experimentally investigated. Clock recovery from data signals that have no
explicit subharmonic tone is also achieved. The proposed system can be
modified to extract prescaled clock and line-rate clock from 160 Gb/s data
signal using all 40-GHz devices.
© 2009 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription