Abstract
The propagation and switching of short pulses in an active two-core fiber
nonlinear directional coupler have been investigated theoretically by using
the split-step Fourier method. The analysis highlights the effects of the
second-order coupling coefficient dispersion, the linear gain coefficient,
and the finite-gain bandwidth on the switching and propagation of short
pulses. The research indicates that the linear gain can sharpen the
switching characteristic and reduce considerably the switching threshold
power, as well as significantly increase the switching efficiency with the
influences of the second-order coupling coefficient dispersion. However,
both the second-order coupling coefficient dispersion and the finite-gain
bandwidth degrade the switching characteristics. In addition, the
finite-gain bandwidth of linear gain not only suppresses significantly the
pulse compression and amplification caused by the linear gain coefficient,
but also suppresses effectively the frequent pulse fluctuation on pulse
propagation induced by the second-order coupling coefficient dispersion;
consequently, as in the case of the passive fiber coupler, optical pulses
tend to restore periodical coupling propagation in active two-core fiber
coupler.
© 2009 US
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