Abstract

A dual-core waveguide with balanced gain and loss in different arms and with intermodal coupling is considered. The system is not invariant under the conventional PT symmetry, but obeys CPT symmetry where an additional spatial inversion C corresponds to swapping the coupler arms. We show that second-order dispersion of coupling allows for unbroken CPT symmetry and supports propagation of stable vector solitons along the coupler. Small-amplitude solitons are found in explicit form. The combined effect of gain-and-loss and dispersive coupling results in several interesting features which include a separation between the components in different arms, nontrivial dependence of stability of a soliton on its velocity, and the existence of more complex stationary two-hump solutions. Unusual decay dynamics of unstable solitons are also discussed.

© 2017 Optical Society of America

Full Article  |  PDF Article
More Like This
Solitons in a PT-symmetric χ(2) coupler

Magnus Ögren, Fatkhulla Kh. Abdullaev, and Vladimir V. Konotop
Opt. Lett. 42(20) 4079-4082 (2017)

Dark soliton steering in PT-symmetric couplers with third-order and intermodal dispersions

Dipti Kanika Mahato, A. Govindarajan, and Amarendra K. Sarma
J. Opt. Soc. Am. B 37(11) 3443-3452 (2020)

Compensating intermodal dispersion in photonic crystal directional couplers

Francisco Cuesta-Soto, Beatriz García-Baños, and Javier Martí
Opt. Lett. 30(23) 3156-3158 (2005)

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

Contact your librarian or system administrator
or
Login to access Optica 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 Optica member, or as an authorized user of your institution.

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

Figures (5)

You do not have subscription access to this journal. Figure files 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

Equations (11)

You do not have subscription access to this journal. Equations 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

Metrics