Affiliation:
1. IFET College of Engineering,Department of Electronics and Communication Engineering,Tamilnadu,India,
Abstract
Most major high-speed applications, such as communications, environmental monitoring, transportation, smart homes, industries and gadgets are enabled by
recent photonic technology. Basic all-optical logic gates are used in the development of
image sensors, ultra-fast optical devices, and positioning equipment in high-speed
applications. Among different technologies proposed for all-optical implementation,
Semiconductor Optical Amplifiers (SOA) have been widely adopted. They have
attractive features such as wide gain bandwidth, low power consumption, compactness
and strong non-linearity. SOA still has a limitation that its spontaneous emission noise
restricts the performance. The semiconductor optical amplifiers with quantum dots
exhibit higher saturation output power, lower current density threshold, wider gain
bandwidth, and low noise figure than conventional SOA. Quantum Dot Semiconductor
Optical Amplifiers (QDSOAs) also have limitations like large size, high power
consumption and spontaneous emission of noise. Photonic Crystal (PhC) is an artificial
material that is suitable to overcome all drawbacks of SOA and QDSOA due to its
simple structure and compactness, high speed, low power consumption, and low loss.
PhC-based structures allow propagation of light in a controlled manner with its
periodic crystal arrangements having dissimilar diffraction index. PhCs are considered
to be a suitable structure for designing all-optical devices with compactness. In this
chapter, an all-optical XOR is designed. Initially, the XOR gate is designed and
simulated by using the FDTD method. The proposed XOR logic is achieved without
nano-resonators and then with nanoresonators to get enhanced performance metrics in
the form of high contrast ratio. The contrast ratio is 260 dB for the XOR gate with a
delay time of 0.19 ps. The proposed XOR logic gate has potential practical applications
for high speed applications of telecommunication systems.<br>
Publisher
BENTHAM SCIENCE PUBLISHERS