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Fiber : the coming tech revolution- and why America might miss it /
The world of 5G, the next generation of telecommunication technology, will be as different from what came before as the world after the advent of electricity. The massive amounts of data we'll be able to stream through fiber-optic connections will enable a degree of virtual presence that will radically transform health care, education, urban administration and services, agriculture, retail sales, and offices. Yet all of those transformations will pale in comparison to the innovations that we can't even imagine today. In a fascinating account combining legal expertise with compelling on-the-ground reporting, Susan Crawford reveals how the giant corporations that control cable and internet access in the United States use their tremendous lobbying power to tilt the playing field against competition, holding back the infrastructure improvements necessary for the country to move forward. And she shows how a few cities and towns are fighting monopoly power to bring the next technological revolution to their communities.
Book
Advantages of EADFB laser for 25 Gbaud/s 4-PAM (50 Gbit/s) modulation and 10 km single-mode fibre transmission
The 25 Gbaud/s 4-level pulse amplitude modulation (4-PAM) of a 1.3 μm electroabsorption modulator integrated with a distributed feedback (DFB) laser is demonstrated for the first time. The linearities of the electroabsorption DFB (EADFB) laser and the directly modulated laser are evaluated to investigate the applicability of the PAM format to these devices.
Journal Article
Essentials of nonlinear optics
Current literature on Nonlinear Optics varies widely in terms of content, style, and coverage of specific topics, relative emphasis of areas and the depth of treatment. While most of these books are excellent resources for the researchers, there is a strong need for books appropriate for presenting the subject at the undergraduate or postgraduate levels in Universities. The need for such a book to serve as a textbook at the level of the bachelors and masters courses was felt by the authors while teaching courses on nonlinear optics to students of both science and engineering during the past two decades. This book has emerged from an attempt to address the requirement of presenting the subject at college level. A one-semester course covering the essentials can effectively be designed based on this.
eBook
Data-driven solitons and parameter discovery to the (2+1)-dimensional NLSE in optical fiber communications
In this paper, we investigate the (2+1)-dimensional nonlinear Schrödinger equation (NLSE) which characterizes the transmission of optical pulses through optical fibers exhibiting refractive index variations corresponding to light intensity changes. Traditional numerical methods typically require a substantial amount of data to ensure the accuracy when solving high-dimensional NLSE, resulting in high experimental costs as well as a significant demand for storage space and computing power. With physical knowledge embedded into deep neural networks, physics-informed neural network (PINN) has been widely applied to solve various complex nonlinear problems and achieved significant results with small amount of data. Setting different groups of initial conditions and boundary conditions with hyperbolic and exponential functions, we construct the corresponding loss functions which will be further applied to train PINN. All data studied here is generated on Python. Based on the predicted results, we depict different types of optical pulses. According to our data experiments, lower prediction errors can be achieved with small volume of data, which fully demonstrates the effectiveness of the PINN. In the meantime, we also perform data-driven parameter discovery to the (2+1)-dimensional NLSE to study the coefficients of the group velocity dispersion and self-phase modulation terms. It can be seen that the PINN has high accuracy and robustness for parameter discovery to the (2+1)-dimensional NLSE. In brief, the use of PINN greatly enriches the diversity of solving methods, providing a reference for research of (2+1)-dimensional solitons in the field of optical fiber communications.
Journal Article
Ultra-wideband fiber-THz-fiber seamless integration communication system toward 6G: architecture, key techniques, and testbed implementation
Terahertz (THz) communication is widely regarded as the key component of future 6G mobile communication systems. Through comparative analysis of some of the main existing technical routes of THz up-conversion and down-conversion in THz wireless communication systems, a novel ultra-wideband (UWB) fiber-THz-fiber seamlessly converged real-time architecture, which utilizes the commercially mature digital coherent optical module to realize ultrahigh-capacity THz real-time wireless communication, is proposed in this study. (1) The proposed architecture employs the dual-polarization photonic up-conversion technique for THz generation and hybrid optoelectronic down-conversion technique for THz reception to facilitate the seamless integration between optical fiber and THz communications. (2) Because of the limited bandwidth of optoelectronic devices, multidimensional modulation techniques are adopted for UWB THz signals to improve spectral efficiency and transmission capacity. (3) An intelligent nonlinear joint compensation technique based on the deep neural network, which can effectively improve the signal-to-noise ratio of the time-varying hybrid fiber-THz-fiber channel, is proposed. Based on the investigations of the aforementioned key techniques, we, for the first time, realize the photonics-assisted record-high 100/200 GbE real-time THz wireless transmission at 360–430 GHz band, the capacity of which is 10–20 times higher than that of 5G. The proposed fiber-THz-fiber architecture can realize the smooth conversion between high-speed THz and lightwave signals. Moreover, the architecture can significantly reduce the research difficulty and development cost, thereby considerably accelerating the commercialization of 6G THz technology by thoroughly reusing commercial digital coherent optical module (DCO) modules, which are compatible with the physical layer transmission protocols, such as IEEE 802.3 and ITU-T G.798. Finally, this study also introduces some potential directions of research and development for higher-capacity, longer-distance, and more-integrated fiber-THz-fiber seamless communication.
Journal Article
4 × 2 Tbit/s superchannel self-coherent transmission based on carrier tracking and expanding
A novel superchannel transmission scheme is proposed where an optical comb source is used to carry the multiband signal and one subcarrier is reserved for regeneration as a local oscillator at the receiver end. By combining carrier tracking and carrier expanding, a 4 × 2 Tbit/s superchannel wavelength division multiplexed self-coherent transmission over a 320 km standard single mode fibre has been successfully demonstrated.
Journal Article
Soliton solutions to the generalized derivative nonlinear Schrödinger equation under the effect of multiplicative white noise and conformable derivative
This study explores novel optical soliton solutions for the generalized derivative nonlinear conformable Schrödinger equation under the influence of multiplicative white noise. Using the new Kudryashov method, various solutions are derived, including solitary waves, bright, dark, singular, and W-shaped soliton solutions. The study investigates their dynamic behavior and physical characteristics, emphasizing the role of the conformable order derivative and temporal parameters through three-dimensional, two-dimensional, and contour plots. Incorporating multiplicative white noise into soliton analysis presents an innovative approach, advancing the understanding of nonlinear optical phenomena. Noise management techniques modeled in this study help simulate real-world scenarios where fibers face stochastic disturbances, aiding in the design of robust communication systems. Further, understanding noise’s impact on soliton stability offers insights for minimizing errors in signal processing and enhancing the reliability of optical fiber communication networks.
Journal Article
The revolution of silicon photonics
The success of silicon photonics is a product of two decades of innovations. This photonic platform is enabling novel research fields and novel applications ranging from remote sensing to ultrahigh-bandwidth communications. The future of silicon photonics depends on our ability to ensure scalability in bandwidth, size and power.
Journal Article
Optical Fiber Telecommunications Volume VIA
Optical Fiber Telecommunications VI (A&B) is the sixth in a series that has chronicled the progress in the R&D of lightwave communications since the early 1970s.Written by active authorities from academia and industry, this edition brings a fresh look to many essential topics, including devices, subsystems, systems and networks.
eBook