All Optical Universal Logic TAND Gate
Using a Single Quantum Dot
Semiconductor Optical Amplifier at 2
Tbit/s
Kousik Mukherjee
Abstract All optical universal logic TAND is designed and simulated for performance analysis using rate equation model of quantum dot semiconductor optical
amplifier. Extinction ratio(ER), contrast ratio (CR), and quality factor are calculated.
A large eye opening with low value of amplitude modulation ensures efficient performance also. This TAND gate is used to design basic gates NOT, OR, and AND which
shows that TAND is a universal gate.
Keywords Universal logic · Quantum dot SOA · Cross gain modulation · Q
factor · Contrast ratio
1 Introduction
Quantum Dot Semiconductor Amplifiers (QDSOAs) are important nonlinear devices
for the design of all optical communication and computation applications [1–
5]. QDSOA is an effective gain media and have higher gain at lower injection
current compared to ordinary Semiconductor Optical Amplifiers (SOAs). Moreover,
QDSOAs have higher saturation output power, wider gain bandwidth, and low noise
Fig. 1. TAND gate is a universal gate with only one high output is proposed using
Tera Hertz Asymmetric Demultiplexer (TOAD) is proposed in [6]. In [7], reflective
SOA is used for the implementation of TAND gate. In this chapter, TAND gate using
QDSOA is proposed and analyzed. The universality of TAND gate is established
by designing three basic gates NOT, AND, and OR. Most of the QDSOA-based
logic designs deal with Mach Zehnder interferometer. But, in this chapter, the device
presented uses no Mach Zehnder interferometer. The Mach Zehnder-based designs
requires special techniques for maintaining balance in terms of amplitude and phase
[4]. Section 2 describes the simulated results of operation of the proposed logic gates
using MATLAB. Section 2 gives the basic principle of working of QDSOA-based
K. Mukherjee (B)
Department of Physics, B.B. College, Asansol 713303, India
e-mail: klmukherjee003@gmail.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
A. Biswas et al. (eds.), Emerging Trends in Terahertz Engineering and System
Technologies, https://doi.org/10.1007/978-981-15-9766-4_8
167
Using a Single Quantum Dot
Semiconductor Optical Amplifier at 2
Tbit/s
Kousik Mukherjee
Abstract All optical universal logic TAND is designed and simulated for performance analysis using rate equation model of quantum dot semiconductor optical
amplifier. Extinction ratio(ER), contrast ratio (CR), and quality factor are calculated.
A large eye opening with low value of amplitude modulation ensures efficient performance also. This TAND gate is used to design basic gates NOT, OR, and AND which
shows that TAND is a universal gate.
Keywords Universal logic · Quantum dot SOA · Cross gain modulation · Q
factor · Contrast ratio
1 Introduction
Quantum Dot Semiconductor Amplifiers (QDSOAs) are important nonlinear devices
for the design of all optical communication and computation applications [1–
5]. QDSOA is an effective gain media and have higher gain at lower injection
current compared to ordinary Semiconductor Optical Amplifiers (SOAs). Moreover,
QDSOAs have higher saturation output power, wider gain bandwidth, and low noise
Fig. 1. TAND gate is a universal gate with only one high output is proposed using
Tera Hertz Asymmetric Demultiplexer (TOAD) is proposed in [6]. In [7], reflective
SOA is used for the implementation of TAND gate. In this chapter, TAND gate using
QDSOA is proposed and analyzed. The universality of TAND gate is established
by designing three basic gates NOT, AND, and OR. Most of the QDSOA-based
logic designs deal with Mach Zehnder interferometer. But, in this chapter, the device
presented uses no Mach Zehnder interferometer. The Mach Zehnder-based designs
requires special techniques for maintaining balance in terms of amplitude and phase
[4]. Section 2 describes the simulated results of operation of the proposed logic gates
using MATLAB. Section 2 gives the basic principle of working of QDSOA-based
K. Mukherjee (B)
Department of Physics, B.B. College, Asansol 713303, India
e-mail: klmukherjee003@gmail.com
© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021
A. Biswas et al. (eds.), Emerging Trends in Terahertz Engineering and System
Technologies, https://doi.org/10.1007/978-981-15-9766-4_8
167