A versatile all-optical parity-time signal processing device using a Bragg grating induced using positive and negative Kerr-nonlinearity

Abstract

(2015) A versatile all-optical parity-time signal processing device using a Bragg grating induced using positive and negative Kerrnonlinearity. Optical and Quantum Electronics, 47 (1 A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract. The properties of gratings with Kerr nonlinearity and PT symmetry are investigated in this paper. The impact of the gain and loss saturation on the response of the grating is analysed for different input intensities and gain/loss parameters. Potential applications of these gratings as switches, logic gates and amplifiers are also shown.

Parity-time symmetric coupled microresonators with a dispersive gain/loss

“…For this purpose, the two-dimensional (2D) timedomain Transmission Line Modeling (TLM) numerical method is used. A more detailed description of the TLM method is given in [28,29] and the implementation of general dispersive materials for PT-symmetric Bragg gratings is demonstrated in [10,19]. In each of the simulations shown in this section, the low Q-factor (7,2) mode is excited by a very narrow-band Gaussian dipole located in µR G whose frequency is matched to the resonant frequency of this mode.…”

Tailoring Spectral Properties of Binary PT-Symmetric Gratings by Duty-Cycle Methods

“…(ii) A large evolution of dispersion properties and band gap behavior of a PTBG induced by a limited variation of the gainloss level [5,6]. Such dispersion changes can be advantageously exploited for implementing switches and modulators controlled by tuning of the gain-loss level [13][14][15][16][17][18][19][20]. As was learnt over decades in the case of conventional passive type Bragg gratings with countless applications in optical networks, one of the most stringent requirements to be fulfilled for practical applications is related to the control of the spectral response and/or Bragg grating dispersion properties.…”

Coupled Parity-Time symmetric cavities: Results from Transmission Line Modelling simulations

“…Similar modal behaviour was also noted in a recent publication [18] in which the resonant frequencies of the coupled PT-microcavities were calculated analytically by solving Green's integral equation. namely direct transmission 12 and cross transmission 14 . On the other hand, if port 4 is excited, the direct transmission is 43 and the cross transmission is 41 .…”

“…PT-symmetric photonic structures based on Bragg gratings, coupler waveguides, lattices and resonant cavities have been studied theoretically and experimentally and shown to exhibit directionally dependent properties, such as loss-induced unidirectional invisibility, simultaneous laser and coherent absorber modes and loss-induced lasing. A range of applications such as switching, logical-gate operation, laser and memory have been proposed based on the existence of the threshold and their directional dependent property [7][8][9][10][11][12][13][14].…”