In this work, we present the study of an asymmetric Mach-Zehnder interferometer using dual core photonic crystal fiber. The asymmetry is obtained through the nonlinearity parameters of the couplers. The study was carried out from the solution of the coupled mode equation, in which we considered the second and third order dispersive effects (GVD and TOD) and non-linear effects (SPM, self-steepening and Raman effect). We analyzed three configurations: a symmetric coupler followed by an asymmetrical one, an asymmetric coupler followed by a symmetric one and two asymmetric couplers. From the analysis of the device, we obtained the logic gates OR, XOR, AND, function 0, function A′·B and function A·B′, considering the OOK keying.

Obtaining optical logic gates – OR, XOR, AND and logic functions using asymmetric Mach-Zehnder interferometer based on photonic crystal fiber

Nonlinearity effect on dual photonic crystal fiber coupler for generating fully optical logic gates

In this work, we studied the optical bistability of Fiber Bragg Grating (FBG) under nonlinear regime, considering three increasing and decreasing profiles of nonlinearity: linear, quadratic and exp...

Bistability of ultrashort pulses in FBG under different nonlinearity profiles

Photonic Crystal Fiber-Based Interferometer Sensors

: In the context of PT -symmetric ﬁber Bragg gratings, tailoring the nonlinear proﬁle along the propagation coordinate serves to be a new direction for realizing low-power all-optical switches. The scheme is fruitful only when the nonlinearity proﬁle will be either linearly decreasing or increasing form. If the rate of variation of the nonlinearity proﬁle is high, the critical intensities fall below the input power of value 0.01 in the unbroken regime provided that the light launching direction is right. Nowadays, every new theoretical inception into the PTFBG has started making sense of switching in the broken PT -symmetric regime which was once believed to be the instability regime. When the inhomogeneous nonlinearity acts together with the broken PT -symmetry and right light incidence, it leads to two peculiar settings. First, the switch-up intensities are ultra-low. Second, the switch-down action takes place at zero critical intensities. Such OB curves are unprecedented in the context of conventional gratings and found only in plasmonic

Inhomogeneous nonlinearity meets $\mathcal{PT}$-symmetric Bragg structures: Route to ultra-low power steering and peculiar stable states

In this work, we present a numerical study to investigate the transmission, extinction ratio, crosstalk and compression factor outputs of a Mach–Zehnder interferometer in photonic crystal fibers by varying the nonlinearity parameter of the fiber from β = 1 to β = 2 for three different nonlinearity profiles (constant, increasing and decreasing) and in three different scenarios (P0 = Pc, P0 Pc). We observed that the highest transmission (T = 67%), the highest extinction ratio (XR = 3.57 dB) and the lowest crosstalk (Xtalk = -5.25 dB) occurred in the third scenario (P0 = 110 kW > Pc) considering the decreasing profile for β = 1.35. Such condition enables applications such as TDMA and logic circuits.

D. B. Costa

Papers

Mach–Zehnder nonlinear interferometer in photonic crystal fibers with nonlinearity profiles