Eight-input optical programmable logic array enabled by parallel spectrum modulation

Despite over 40 years' development of optical logic computing, the studies have been still struggling to support more than four operands, since the high parallelism of light has not been fully leveraged blocked by the optical nonlinearity and redundant input modulation in existing methods. Here, we propose a scalable multi-input optical programmable logic array (PLA) with minimal logical input, enabled by parallel spectrum modulation. By making full use of the wavelength resource, an eight-input PLA is experimentally demonstrated, and there are 2^256 possible combinations of generated logic gates. Various complex logic fuctions, such as 8-256 decoder, 4-bit comparator, adder and multiplier are experimentally demonstrated via leveraging the PLA. The scale of PLA can be further extended by fully using the dimensions of wavelength and space. As an example, a nine-input PLA is implemented to realize the two-dimensional optical cellular automaton for the first time and perform Conway's Game of Life to simulate the evolutionary process of cells. Our work significantly alleviates the challenge of extensibility of optical logic devices, opening up new avenues for future large-scale, high-speed and energy-efficient optical digital computing

On architecture and scalability of optical multi-protocol label switching networks using optical-orthogonal-code label.

Wen Yonggang.Thesis (M.Phil.)--Chinese University of Hong Kong, 2001.Includes bibliographical references.Abstracts in English and Chinese.Chapter 1 --- IntroductionChapter 1.1 --- Multi-Protocol Label Switching (MPLS) Technology --- p.1Chapter 1.2 --- Objective of this Thesis --- p.4Chapter 1.3 --- Reference --- p.5Chapter 2 --- Optical MPLS Network and Optical Label SchemesChapter 2.1 --- Optical MPLS Network --- p.7Chapter 2.2 --- Optical Label Schemes --- p.10Chapter 2.2.1 --- Time-division OMPLS scheme --- p.12Chapter 2.2.2 --- Wavelength-division OMPLS scheme --- p.16Chapter 2.2.3 --- Frequency-division OMPLS scheme --- p.22Chapter 2.2.3.1 --- UCSB Testbed --- p.23Chapter 2.2.3.2 --- UC-Davis Testbed --- p.26Chapter 2.2.3.3 --- NCTU-Telecordia Testbed --- p.28Chapter 2.2.4 --- Code-division OMPLS scheme --- p.30Chapter 2.2.4.1 --- Coherent Code-Division Label Scheme --- p.30Chapter 2.2.4.2 --- Noncoherent Code-Division Label Scheme --- p.32Chapter 2.3 --- Reference --- p.35Chapter 3 --- Architecture of OOC-based OMPLS networkChapter 3.1 --- Infrastructure of OOC-label switch router (code converter) --- p.37Chapter 3.1.1 --- Architecture of the Proposed Code Converter --- p.38Chapter 3.1.2 --- Enhancement of the Code Converter --- p.41Chapter 3.2 --- Implementation of the OOC code converter --- p.43Chapter 3.2.1 --- Encoders/Decoders --- p.43Chapter 3.2.1.1 --- All-parallel encoders/decoders --- p.43Chapter 3.2.1.2 --- All-serial encoders/decoders --- p.45Chapter 3.2.1.3 --- Serial-to-parallel encoder/decoders --- p.47Chapter 3.2.1.4 --- Comparison of the three kinds of encoders/decoders --- p.49Chapter 3.2.2 --- Time-Gate-Intensity-Threshold (TGIT) Device --- p.50Chapter 3.2.3 --- Optical Space Switch Array --- p.54Chapter 3.2.3.1 --- All-optical Space Switch --- p.54Chapter 3.2.3.2 --- Optical switching technologies --- p.56Chapter 3.2.3.2.1 --- Scalability --- p.56Chapter 3.2.3.2.2 --- Switching Speed --- p.57Chapter 3.2.3.2.3 --- Reliability --- p.57Chapter 3.2.3.2.4 --- Losses --- p.58Chapter 3.2.3.2.5 --- Port-to-Port repeatability --- p.58Chapter 3.2.3.2.6 --- Cost --- p.59Chapter 3.2.3.2.7 --- Power Consumption --- p.60Chapter 3.3 --- Reference --- p.61Chapter 4 --- Scalability of OOC-based MPLS networkChapter 4.1 --- Limitation on Label Switching Capacity --- p.63Chapter 4.1.1 --- Upper Bound --- p.65Chapter 4.1.2 --- Lower Bound --- p.66Chapter 4.2 --- Limitation on Switching Cascadability --- p.70Chapter 4.2.1. --- Limit Induced by the Inter-channel Crosstalk --- p.70Chapter 4.2.2 --- Limits Induced by the Residue Intensity of Sidelobes --- p.74Chapter 4.3 --- Appendix --- p.78Chapter 4.3.1 --- Derivation of Chip Intensity --- p.78Chapter 4.3.2 --- The 5% residue power criterion --- p.81Chapter 4.4 --- Reference --- p.83Chapter 5 --- ConclusionChapter 5.1 --- Summary of the Thesis --- p.85Chapter 5.2 --- Future work --- p.8

Sonic and Photonic Crystals

Sonic/phononic crystals termed acoustic/sonic band gap media are elastic analogues of photonic crystals and have also recently received renewed attention in many acoustic applications. Photonic crystals have a periodic dielectric modulation with a spatial scale on the order of the optical wavelength. The design and optimization of photonic crystals can be utilized in many applications by combining factors related to the combinations of intermixing materials, lattice symmetry, lattice constant, filling factor, shape of the scattering object, and thickness of a structural layer. Through the publications and discussions of the research on sonic/phononic crystals, researchers can obtain effective and valuable results and improve their future development in related fields. Devices based on these crystals can be utilized in mechanical and physical applications and can also be designed for novel applications as based on the investigations in this Special Issue

Roadmap of optical communications

© 2016 IOP Publishing Ltd. Lightwave communications is a necessity for the information age. Optical links provide enormous bandwidth, and the optical fiber is the only medium that can meet the modern society's needs for transporting massive amounts of data over long distances. Applications range from global high-capacity networks, which constitute the backbone of the internet, to the massively parallel interconnects that provide data connectivity inside datacenters and supercomputers. Optical communications is a diverse and rapidly changing field, where experts in photonics, communications, electronics, and signal processing work side by side to meet the ever-increasing demands for higher capacity, lower cost, and lower energy consumption, while adapting the system design to novel services and technologies. Due to the interdisciplinary nature of this rich research field, Journal of Optics has invited 16 researchers, each a world-leading expert in their respective subfields, to contribute a section to this invited review article, summarizing their views on state-of-the-art and future developments in optical communications

Optical Communication

Optical communication is very much useful in telecommunication systems, data processing and networking. It consists of a transmitter that encodes a message into an optical signal, a channel that carries the signal to its desired destination, and a receiver that reproduces the message from the received optical signal. It presents up to date results on communication systems, along with the explanations of their relevance, from leading researchers in this field. The chapters cover general concepts of optical communication, components, systems, networks, signal processing and MIMO systems. In recent years, optical components and other enhanced signal processing functions are also considered in depth for optical communications systems. The researcher has also concentrated on optical devices, networking, signal processing, and MIMO systems and other enhanced functions for optical communication. This book is targeted at research, development and design engineers from the teams in manufacturing industry, academia and telecommunication industries

Design of Ultrafast All-Optical Pseudo Binary Random Sequence Generator, 4-bit Multiplier and Divider using 2 x 2 Silicon Micro-ring Resonators

All-optical devices are essential for next generation ultrafast, ultralow-power and ultrahigh bandwidth information processing systems. Silicon microring resonators (SiMRR) provide a versatile platform for all-optical switching and CMOS-compatible computing, with added advantages of high Q-factor, tunability, compactness, cascadability and scalability. A detailed theoretical analysis of ultrafast all-optical switching 2 x 2 SiMRRs has been carried out incorporating the effects of two photon absorption induced free-carrier injection and thermo optic effect. The results have been used to design simple and compact all-optical 3-bit and 4-bit pseudo-random binary sequence generators and the first reported designs of all-optical 4 x 4-bit multiplier and divider. The designs have been optimized for low-power, ultrafast operation with high modulation depth, enabling logic operations at 45 Gbps.Comment: 13 pages, 4 figures. Submitted at Journal (Optik) for publicatio