Optical Bistability in an Acousto-Optic Tunable Filter (AOTF) Operating with Short Optical Pulses

Abstract

In this paper we report for the first time the presence of bistability in an acoustic-optic tunable filter (AOTF) operating with ultrashort (2 ps) optical light pulses. The results for the study of bistability has shown the dependence of the hysteresis curve with the product of the coupling constant (κ) by the length of the device (ξ<sub>L</sub>) and the conversion power-coupling constant factor (G). The range of bistability varies significantly with both G and with κξ<sub>L</sub> parameters. The variation of κξ<sub>L</sub> directly increases the size of the range of bistability hysteresis while the increase in G causes the bistability to occur at low powers. The phenomenon of optical bistability (OB) is the object of increasing interest due to its possibilities for important device applications. A bistable device is a device with a capability to generate two different outputs for a given input and the physical requirements for this are an intensity-dependence refractive index and an optical feedback mechanism

Analysis of the Performance of Optical Code-Division Multiple-Access System (OCDMA), Operating with Gold Codes under Nonlinear Effects

“…The light proceeding from ones of the input gates (I1 or I2) will be guided for one of the output gates (O1 or O2), and depend, in linear regime, on the coupling length (Lc). Thus, in the linear regime, the behavior of the coupler is associated to the Lc parameter as [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]:…”