Abstract

The dynamic properties of a nonlinear directional coupler made of Kerr materials are investigated using a normal-mode theory based on even and odd supermodes. This analysis provides a good platform to study the pulse propagation in nonlinear multimode waveguides, since the device is simple and can be regarded as a bimodal waveguide. Although the nonlinear directional coupler has already been well investigated using the standard coupled-mode theory, this paper presents new knowledge concerning the device operation from the standpoint of supermodes. Under the normal-mode model, power exchange between the two supermodes is performed through non-phase-matched four-wave mixing (FWM) and new frequency components are created on propagation, leading to spectral broadening of optical pulses. It is found that the group-delay mismatch between the two modes induces instability in collaboration to the nonlinearity when the duration of input pulses is of the order of sub-picoseconds. The dynamic properties of the nonlinear directional coupler are quite similar to those of the nonlinear MMI coupler that were more recently investigated by the present authors.

© 2013 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

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 OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription