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Optical High-speed Information Technology
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Optical High-speed Information Technology

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (28 February 2019) | Viewed by 19507

Special Issue Editor

Dr. Antaryami Mohanta

E-Mail Website1 Website2
Guest Editor
Laser, Photonics and Optoelectronics Team, Directed Energy Research Centre, Technology Innovation Institute, P.O. Box 9639, Masdar City, Abu Dhabi, United Arab Emirates
Interests: laser ablation; induction plasma synthesis; photoluminescence; Raman spectroscopy; semiconductor optics; chemical vapor deposition; time-resolved spectroscopy; pump–probe spectroscopy; photoluminescence excitation spectroscopy; laser–matter interactions
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The field of optical high-speed information technology includes a wide range of topics, starting from basic to advanced research and technological applications, which have been given significant interest by different sectors. The successful demonstration of semiconductor lasers for optical communication stimulated a series of development in optoelectronics, including vertical-cavity surface-emitting lasers, light emitting diodes, semiconductor optical amplifiers, etc. Semiconductor structures, such as quantum wells, quantum wires, quantum dots, etc., with emissions corresponding to the desired wavelength for use in fiber optical telecommunication systems, have been investigated using various techniques including photoluminescence, time-resolved photoluminescence, photoluminescence excitation spectroscopy, and other ultra-fast optical spectroscopy, such as optical pump-optical probe spectroscopy, optical pump-terahertz probe spectroscopy, time-resolved excitation-correlation spectroscopy, etc. Furthermore, security in high speed and massive information transmissions are a major issue for this rapidly-evolving information-oriented culture. The rapid upgrading of digital computer technology can result in a fast decoding of standard code for scrambling data in secure communication systems, which can lead to eavesdropping. Research on quantum computing and communication methodology have also been evolving and have attracted significant attention from the global scientific and technological community. Alternatively, semiconductor laser based optical chaotic communication systems have been proposed to be efficient potential candidates for secure information processing technology due to the high speed and broadband capabilities with optical encoding and decoding.

The current Special Issue is formulated for articles presenting both reviews of most recent research outcomes and original research papers in the field of optical high-speed information technology. The research topics are not strictly restricted to the aforementioned research fields and can also cover wide range of related research fields, such as fiber optics, quantum computing, chaos, chaotic systems, synchronization of chaos, encoding and decoding, cryptography, optical communication, optoelectronic device fabrication and characterization, fiber materials, semiconductors, high electron mobility transistors (HEMT), and new relevant technological advancements.

Dr. Antaryami Mohanta
Guest Editor

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Keywords

  • Fiber optics
  • Quantum computing
  • Chaos
  • Chaotic systems
  • Synchronization of chaos
  • Encoding and decoding
  • Cryptography
  • Optical communication
  • Optoelectronic device fabrication and characterization
  • Fiber materials
  • Semiconductors
  • High electron mobility transistors (HEMT)

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Published Papers (5 papers)

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Research

13 pages, 3483 KiB  
Article
Research on the Influence of Backlash on Mesh Stiffness and the Nonlinear Dynamics of Spur Gears
by Yangshou Xiong, Kang Huang, Fengwei Xu, Yong Yi, Meng Sang and Hua Zhai
Appl. Sci. 2019, 9(5), 1029; https://doi.org/10.3390/app9051029 - 12 Mar 2019
Cited by 25 | Viewed by 4201
Abstract
In light of ignoring the effect of backlash on mesh stiffness in existing gear dynamic theory, a precise profile equation was established based on the generating processing principle. An improved potential energy method was proposed to calculate the mesh stiffness. The calculation result [...] Read more.
In light of ignoring the effect of backlash on mesh stiffness in existing gear dynamic theory, a precise profile equation was established based on the generating processing principle. An improved potential energy method was proposed to calculate the mesh stiffness. The calculation result showed that when compared with the case of ignoring backlash, the mesh stiffness with backlash had an obvious decrease in a mesh cycle and the rate of decline had a trend of decreasing first and then increasing, so a stiffness coefficient was introduced to observe the effect of backlash. The Fourier series expansion was employed to fit the mesh stiffness rather than time-varying mesh stiffness, and the stiffness coefficient was fitted with the same method. The time-varying mesh stiffness was presented in terms of the piecewise function. The single degree of freedom model was employed, and the fourth order Runge–Kutta method was utilized to investigate the effect of backlash on the nonlinear dynamic characteristics with reference to the time history chart, phase diagram, Poincare map, and Fast Fourier Transformation (FFT) spectrogram. The numerical results revealed that the gear system primarily performs a non-harmonic-single-periodic motion. The partially enlarged views indicate that the system also exhibits small-amplitude and low-frequency motion. For different cases of backlash, the low-frequency motion sometimes shows excellent periodicity and stability and sometimes shows chaos. It is of practical guiding significance to know the mechanisms of some unusual noises as well as the design and manufacture of gear backlash. Full article
(This article belongs to the Special Issue Optical High-speed Information Technology)
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8 pages, 1921 KiB  
Article
MZM Optimization of PAM-4 Transmission in Data Center Interconnect
by Eduard Sonkin, Dan Sadot and Gilad Katz
Appl. Sci. 2019, 9(4), 637; https://doi.org/10.3390/app9040637 - 14 Feb 2019
Cited by 6 | Viewed by 4011
Abstract
An analog optimization of 4-level pulse amplitude modulation (PAM-4) signal is proposed, together with maximum likelihood sequence estimation digital signal processing. The proposed optimizations are verified by experimental demonstration at 53 Gbaud, indicating an improvement of 4–5 dB in the optical signal to [...] Read more.
An analog optimization of 4-level pulse amplitude modulation (PAM-4) signal is proposed, together with maximum likelihood sequence estimation digital signal processing. The proposed optimizations are verified by experimental demonstration at 53 Gbaud, indicating an improvement of 4–5 dB in the optical signal to noise sensitivity. Full article
(This article belongs to the Special Issue Optical High-speed Information Technology)
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13 pages, 7740 KiB  
Article
Design of Synchronized Large-Scale Chaos Random Number Generators and Its Application to Secure Communication
by Teh-Lu Liao, Pei-Yen Wan and Jun-Juh Yan
Appl. Sci. 2019, 9(1), 185; https://doi.org/10.3390/app9010185 - 7 Jan 2019
Cited by 14 | Viewed by 4661
Abstract
This paper is concerned with the design of synchronized large-scale chaos random number generators (CRNGs) and its application to secure communication. In order to increase the diversity of chaotic signals, we firstly introduce additional modulation parameters in the original chaotic Duffing map system [...] Read more.
This paper is concerned with the design of synchronized large-scale chaos random number generators (CRNGs) and its application to secure communication. In order to increase the diversity of chaotic signals, we firstly introduce additional modulation parameters in the original chaotic Duffing map system to modulate the amplitude and DC offset of the chaotic states. Then according to the butterfly effect, we implement modulated Duffing map systems with different initial values by using the microcontroller and complete the design of large-scale CRNGs. Next, a discrete sliding mode scheme is proposed to solve the synchronization problem of the master-slave large-scale CRNGs. Finally, we integrate the aforementioned results to implement an innovative secure communication system. Full article
(This article belongs to the Special Issue Optical High-speed Information Technology)
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14 pages, 3359 KiB  
Article
Advancing High-Speed Transmissions over OCDMA Networks by Employing an Intelligently Structured Receiver for Noise Mitigation
by Kai-Sheng Chen, Yi-Chang Chen and Long-Guang Liao
Appl. Sci. 2018, 8(12), 2408; https://doi.org/10.3390/app8122408 - 27 Nov 2018
Cited by 15 | Viewed by 2670
Abstract
We propose an intelligently structured receiver to achieve high-speed transmissions over optical code-division multiple access (OCDMA) networks. Employing spectral-amplitude coding (SAC) reduces multiuser interference (MUI) in OCDMA, but the network bit-rate is limited by phase-induced intensity noise (PIIN) coming from the incoherency of [...] Read more.
We propose an intelligently structured receiver to achieve high-speed transmissions over optical code-division multiple access (OCDMA) networks. Employing spectral-amplitude coding (SAC) reduces multiuser interference (MUI) in OCDMA, but the network bit-rate is limited by phase-induced intensity noise (PIIN) coming from the incoherency of light sources. To mitigate PIIN, the receiver performs interference estimations and regenerations through consecutive stages. The MUI is removed by subtracting the estimated interference term from the received multiplexed signals. For PIIN variance, it is both dependent on and positively related to user number and bit-rate. Reducing the number of interference users allows the network to support transmissions with a higher speed under a given noise level. The proposed scheme has the advantages of all-optical signal processing and a compact structure. Additionally, the function of noise suppression is rarely studied in the existing MUI elimination schemes, such as serial interference cancellation (SIC) and parallel interference cancellation (PIC). The simulation results show the proposed receiver achieves significant increment in bit-rate than the conventional balanced detector in SAC–OCDMA networks. Full article
(This article belongs to the Special Issue Optical High-speed Information Technology)
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20 pages, 1272 KiB  
Article
Practical Quantum Bit Commitment Protocol Based on Quantum Oblivious Transfer
by Yaqi Song and Li Yang
Appl. Sci. 2018, 8(10), 1990; https://doi.org/10.3390/app8101990 - 19 Oct 2018
Cited by 7 | Viewed by 3427
Abstract
Oblivious transfer (OT) and bit commitment (BC) are two-party cryptographic protocols which play crucial roles in the construction of various cryptographic protocols. We propose three practical quantum cryptographic protocols in this paper. We first construct a practical quantum random oblivious transfer (R-OT) protocol [...] Read more.
Oblivious transfer (OT) and bit commitment (BC) are two-party cryptographic protocols which play crucial roles in the construction of various cryptographic protocols. We propose three practical quantum cryptographic protocols in this paper. We first construct a practical quantum random oblivious transfer (R-OT) protocol based on the fact that non-orthogonal states cannot be reliably distinguished. Then, we construct a fault-tolerant one-out-of-two oblivious transfer ( O T 1 2 ) protocol based on the quantum R-OT protocol. Afterwards, we propose a quantum bit commitment (QBC) protocol which executes the fault-tolerant O T 1 2 several times. Mayers, Lo and Chau (MLC) no-go theorem proves that QBC protocol cannot be unconditionally secure. However, we find that computing the unitary transformation of no-go theorem attack needs so many resources that it is not realistically implementable. We give a definition of physical security for QBC protocols and prove that the practical QBC we proposed is physically secure and can be implemented in the real world. Full article
(This article belongs to the Special Issue Optical High-speed Information Technology)
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