All-Optical Flip-Flop Based on an SOA/DFB-Laser Diode Optical Feedback Scheme

Abstract

Abstract-We report on the dynamic all-optical flip-flop (AOFF) operation of an optical feedback scheme consisting of a semiconductor optical amplifier (SOA) and a distributed feedback laser diode (DFB-LD), bidirectionally coupled to each other. The operation of the AOFF relies on the interplay between the optical powers in both the DFB-LD and the SOA. Switching times as low as 150 ps for switch pulse energies of around 6 pJ and a repetition rate of 500 MHz have been measured. The contrast ratio was measured to be above 12 dB.Index Terms-Optical bistability, optical signal processing, semiconductor optical amplifiers (SOAs).

An all-optical architecture of serial to parallel converter by using Kerr type of non-linear material

“…To organize the operation all the input beams should be drawn from a single coherent laser source. As the thickness of the NLM and LM are very small (≈mm), so a metre order of coherent Table 1 Truth table for AND (c) Based on this switching action several all-optical logic devices and gates have been proposed [13][14][15][16][17][18][19]. So, we have not discussed the action of these types of switches for all other logic gates.…”

“…Because of many inherent advantages of optics, photonic switching operations are used to implement different logic gates [12][13][14][15]. In this communication the authors propose a new method of implementing all-optical serial in parallel out type of data conversion system with the use of optical J-K Flip-Flop and optical logic gates.…”

All-optical flip-flop operation based on asymmetric active-multimode interferometer bi-stable laser diodes

“…So far, several types of all-optical flip-flops have been proposed and demonstrated as alloptical memory elements, including active multi-mode interference (MMI) [3] bi-stable laser diodes (BLDs) [4][5][6][7][8], coupled laser diodes [9], semiconductor optical amplifier-based MachZehnder interferometers [10], distributed feedback lasers with continuous-wave (CW) light injection [11][12], polarization-bi-stable vertical-cavity surface-emitting lasers (VCSELs) [13], etc. Among them, active-MMI BLDs are attractive due to their relatively superior fabrication tolerance and their ability to achieve low threshold currents with wide hysteresis windows, which are important features of future highly integrated RAMs [4].…”

All-Optical flip-flop operation using a SOA and DFB laser diode optical feedback combination

“…Here we numerically and experimentally demonstrate and discuss an all-optical flip-flop (AOFF) composed of a semiconductor optical amplifier (SOA) and a DFB-laser diode mutually connected through a coupler [8], [9], [10]. We show that the device can operate for different input wavelengths, pulse lengths and CW input powers making it a very flexible and robust device usable for different network conditions.…”