Tunable nonlinear spectra of anti-directional couplers

A. Govindarajan, Boris A. Malomed, M. Lakshmanan

Research output: Contribution to journalArticlepeer-review


We produce transmission and reflection spectra of the anti-directional coupler (ADC) composed of linearly coupled positive- and negative-refractive-index arms, with intrinsic Kerr nonlinearity. Both reflection and transmission feature two highly amplified peaks at two distinct wavelengths in a certain range of values of the gain, making it possible to design a wavelength-selective mode-amplification system. We also predict that a blend of gain and loss in suitable proportions can robustly enhance reflection spectra that are detrimentally affected by the attenuation, in addition to causing red and blue shifts owing to the Kerr effect. In particular, ADC with equal gain and loss coefficients is considered in necessary detail.

Original languageEnglish
Pages (from-to)1918-1921
Number of pages4
JournalOptics Letters
Issue number7
StatePublished - 1 Apr 2020


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