A5051272349- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- graph theory and CDMA systems
- Photonic Crystals and Applications
- Software-Defined Networks and 5G
- Cloud Computing and Resource Management
- Coding theory and cryptography
- Advanced Fiber Laser Technologies
- Wireless Communication Networks Research
- Thin-Film Transistor Technologies
- ICT Impact and Policies
- Graph Labeling and Dimension Problems
- Advanced Fiber Optic Sensors
- Spectroscopy Techniques in Biomedical and Chemical Research
- Slime Mold and Myxomycetes Research
- Magneto-Optical Properties and Applications
- Photonic Crystal and Fiber Optics
- Power Line Communications and Noise
- IoT and Edge/Fog Computing
Google (United States)
2011-2024
University of Hong Kong
2023
Access to Wholistic and Productive Living Institute
2017-2021
University of Southampton
2019
Applied StemCell (United States)
2007
AT&T (United States)
2000-2003
University of California, Los Angeles
1998-2002
Nokia (United States)
2000
In this article we review the growing trend of warehouse-scale mega-datacenter computing, Internet transformation driven by applications, and opportunities challenges for fiber optic communication technologies to support growth computing in next three four years.
Passive optical networks (PONs) have been widely used in access and are today the technology of choice for operators, especially when they need to build new infrastructure. Significant effort has put place across years scale speed passive networks. The super-PON concept also proposed order reach customer aggregation PONs. However, it did not produce any standardization efforts nor significant commercial deployments. In November 2018, IEEE 802.3 Working Group formed P802.3cs “Super-PON” Task...
We review the growing need for optical interconnect bandwidth in data center networks, and opportunities challenges wavelength division multiplexing (WDM) to sustain "last 2km" growth inside networks.
We describe our experience developing what we believe to be the world's first large-scale production deployments of lightwave fabrics used for both datacenter networking and machine-learning (ML) applications. Using optical circuit switches (OCSes) transceivers developed in-house, employ hardware software codesign integrate into network computing infrastructure. Key design is a high degree multiplexing enabled by new kinds wavelength-division-multiplexing (WDM) circulators that support...
In this paper, we describe Apollo, to the best of our knowledge, world's first large-scale production deployment optical circuit switches (OCSes) for datacenter networking. We will infrastructure challenges and use cases that motivated switching inside datacenters. then delve into requirements OCSes applications: balancing cost, port count, time, performance, which drive design choices implementation details internally developed 3D MEMS-based OCS. To enable Apollo layer, employ circulators...
We review state-of-the-art datacenter technologies for 800G, 1.6T and beyond interconnect speeds, focusing on 200G per-lane IM-DD (intensity modulated-direct detect) 800G-LR1 coherent-lite transmissions.
We demonstrate a novel balanced differential optical transmitter for spectrally encoded code-division multiple-access (CDMA) systems. The proposed structure is suitable making signaling bipolar using complementary spectral encoding. An CDMA link with pair of programmable and receiver tested at the OC-3 transmission speed (155 Mb/s) single-channel transmission. Unmatched code rejection also demonstrated.
We present a long-reach wavelength-routed time-wavelength division multiplexing (TWDM) passive optical network (PON) architecture (LRWR-PON) and its commercial implementation, which supports up to 768 users per fiber strand 50-km transmission distance. The increased reach allows central offices become more flexible fewer in quantity, while the aggregation reduces size number of cables needed, enabling smaller trenches be used. LRWR-PON also contains eight additional point-to-point...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text C. F. Lam, H. Liu, and R. Urata, "What Devices do Data Centers Need?," in Optical Fiber Communication Conference, OSA Technical Digest (online) (Optica Publishing Group, 2014), paper M2K.5. Export BibTex Endnote (RIS) HTML Plain Video alert Save article
We give an overview of key technologies for realizing WDM-PON. In particular, we highlight promising developments and directions in widely tunable laser achieving a high performance, colorless ONU at the cost points required access networks.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Cedric F. Lam, "Fiber the Home: Getting Beyond 10 Gb/s," Optics & Photonics News 27(3), 22-29 (2016) Export BibTex Endnote (RIS) HTML Plain alert Save article
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text C. F. Lam, "Optical Network Technologies for Datacenter Networks," in National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optica Publishing Group, 2010), paper NWA3. Export BibTex Endnote (RIS) HTML Plain alert Save article
In this paper, we describe Apollo, to the best of our knowledge, world's first large-scale production deployment optical circuit switches (OCSes) for datacenter networking. We review underlying hardware technologies including design internally developed OCS and WDM transceivers.
We present an optical tandem single-sideband receiver that enables the detection of signals having different information in two sidebands same carrier. The technique relies on use a dual-electrode Mach-Zehnder modulator and achieves heterodyne without local oscillator. Sharp filtering requirements are met electrical domain, eliminating need for wasteful guardbands.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text C. F. Lam, "The Road Scalable 1Gb/s FTTH Access Networks," in 37th European Conference and Exposition Optical Communications, OSA Technical Digest (CD) (Optica Publishing Group, 2011), paper Tu.6.C.2. Export BibTex Endnote (RIS) HTML Plain alert Save article
The rise of large-scale Data Centers to power the Internet infrastructure is driving new architectural directions for optical networking. This paper highlights these options and discusses technology building blocks scaling inter-Datacenter connectivity.
This paper proposes a novel wavelength division multiplexer (WDM) demultiplexer design for dense WDM networks. The proposed consists of rectangular shaped periodic frequency filters connected in series. These can be formed with an apodized one-dimensional (l-D) photonic crystal structure on ridged semiconductor waveguide. A example is given such filters. In designs, we use moderate refractive index contrast, discrete groups many layers, to achieve the same stop-band width that would get...
In a spread spectrum system, the signal is transmitted using bandwidth much larger than that required for data. By spreading energy over very broad bandwidth, one can obtain multitude of benefits. Firstly, make difficult to detect by lowering its spectral density and hiding it under noise. Secondly, also makes jamming more task, as high power spectrum.
We investigate the thermal response of a tunable fiber Bragg grating (FBG) with metal coating on bare surface as heater both theoretically and experimentally. By solving differential equation temperature function time, together some reasonable approximation, we obtained an explicit description characteristics structure's heat capacity time constant its parameters. Using squared wave modulation current laser, measured temporal FBG. The curves match our solution. A in range subseconds was...
We review state-of-the-art datacenter technologies for 800G, 1.6T and beyond interconnect speeds, focusing on 200G per-lane IM-DD (intensity modulated-direct detect) 800G-LR1 coherent-lite transmissions.
We highlight promising developments and directions in silicon photonics for realizing cost effective WDM-PON: photonic integration integrated WDM transceivers at the OLT widely tunable laser technologies achieving a high performance, colorless ONU.
Broadband access networking is an important form of basic infrastructure that supports competitive social and economic development. Emerging broadband applications such as IPTV, real-time network gaming, backhauling wireless connection data etc., demand new technological innovations to meet their ever-increasing performance-to-cost requirements. Optical fiber has been established a future-proof medium capable facilitating the next-generation applications. For instance, in Feb. 2010 Google...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text C. Lam, "FTTH Deployment - Google Fiber's Perspective," in Optical Fiber Communication Conference, OSA Technical Digest (online) (Optica Publishing Group, 2017), paper Tu2K.1. Export BibTex Endnote (RIS) HTML Plain alert Save article