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Institution

Finisar

CompanySunnyvale, California, United States
About: Finisar is a company organization based out in Sunnyvale, California, United States. It is known for research contribution in the topics: Signal & Transceiver. The organization has 900 authors who have published 1523 publications receiving 22634 citations.


Papers
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Journal ArticleDOI
TL;DR: An optical fast Fourier transform scheme is demonstrated that provides the necessary computing power to encode lower-bitrate tributaries into 10.8 and 26.0 Tbit s-1 line-rate orthogonal frequency division multiplexing (OFDM) data streams and to decode them from fibre-transmitted OFDM data streams.
Abstract: Optical transmission systems with terabit per second (Tbit s-1) single-channel line rates no longer seem to be too far-fetched. New services such as cloud computing, three-dimensional high-definition television and virtual-reality applications require unprecedented optical channel bandwidths. These high-capacity optical channels, however, are fed from lower-bitrate signals. The question then is whether the lower-bitrate tributary information can viably, energy-efficiently and effortlessly be encoded to and extracted from terabit per second data streams. We demonstrate an optical fast Fourier transform scheme that provides the necessary computing power to encode lower-bitrate tributaries into 10.8 and 26.0 Tbit s-1 line-rate orthogonal frequency division multiplexing (OFDM) data streams and to decode them from fibre-transmitted OFDM data streams. Experiments show the feasibility and ease of handling terabit per second data with low energy consumption. To the best of our knowledge, this is the largest line rate ever encoded onto a single light source.

544 citations

Patent
Frank H. Levinson1
01 Nov 1991
TL;DR: In this article, an information broadcasting system provides a large number of subscribers access to a large amount of information using one or more satellite transmission channels, which can also use cable television transmission channels.
Abstract: An information broadcasting system provides a large number of subscribers access to a large amount of information using one or more satellite transmission channels. The system can also use cable television transmission channels. A program supplier station stores an information database and tags all the information in the database with indices so as to form a single hierarchical structure which encompasses the entire information database. Portions of the information database are transmitted often, at least once per day, in order to provide the basic subscriber with information need to access the remainder of the database. The information provided by the basic subscriber service, which will typically include at least 50 gigabytes of data, is available to all subscribers without requiring two way communications between the subscribers and the program supplier station. Using a tiered system for scheduling transmission of the 50 gigabytes or so of information included in the basic subscriber service, as well as an intelligent subscriber request anticipation scheme for retrieving information before the subscriber asks for it, the present invention provides subscribers with reasonably quick access to all the contents of the large database while using only a modest amount of bandwidth. Furthermore, by reserving a portion of the system's bandwidth for satisfying requests for access to information not provided with the basic subscriber service, timely access to a virtually unlimited amount of information can be provided, using the same modest transmission bandwidth, to those subscribers willing to pay additional fees for that service.

372 citations

Patent
Frank H. Levinson1
31 Jul 1991
TL;DR: In this paper, a laser diode controller (102) uses a programmed microcontroller (162) to accurately control the process of turning on and selecting the operating point of the laser diodes (100).
Abstract: A laser diode controller (102) uses a programmed microcontroller (162) to accurately control the process of turning on and selecting the operating point of the laser diode (100). The laser diode (100) has a front facet (110) for transmitting light, and a back facet (114) for monitoring the laser diode's optical output power. Once the back facet (114) of the laser diode (100) is calibrated, the controller can accurately monitor the laser diode's operating characteristics, and can select the best operating point current based on the current operating characteristics of the laser diode (100). During calibration of the laser diode (100), the controller (102) can check the linearity of the laser diode's optical output power as a function of drive current, and can thereby detect defects in the laser diode (100). In a full duplex optical link, the controller (102) of the present invention prevents the laser diodes from generating light at their full normal intensity until the integrity of the link has been established, thereby preventing light from the laser diode's from accidentally damaging user's eyes. Furthermore, the controller (102) can use the full duplex link to establish lower operating point drive currents that would otherwise be used, thereby significantly lengthening the lifetime of the laser diodes (100). A laser diode's operating characteristics change over time in such a way as to enable the controller (102) to predict when the laser will fail. The controller (102) records the operating characteristics of the laser diode (100) in a nonvolatile memory, analyzes changes in those characteristics, and generates a failure warning message when those changes match predefined failure prediction criteria.

230 citations

Patent
22 Nov 2004
TL;DR: Secure point-to-point (S2P) communications are accomplished by sending data across a secure link as mentioned in this paper, where the trusted partners at the link are matched to each other.
Abstract: Secure point to point network communications. Secure point to point network communications are accomplished by sending data across a secure link. Trusted partners at the link are matched to each other. To ensure that no un-trusted partners are on the link, authentication is performed. One of the points may be a secure tap. The secure tap authenticates a trusted partner by receiving a hardware embedded encryption key or value derived from the hardware embedded encryption key from the trusted partner. Data sent on the trusted link is encrypted to prevent interception of the data. The secure tap polices the link to ensure that no un-trusted are attached to the link and that the trusted partner is not removed from the link. If un-trusted partners are added to the link or trusted partners removed from the link, the secure tap ceases sending data.

220 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the characteristics of VCSELs and photodiodes used in current generation 28 Gb/s links and present several methods to extend link distances using more advanced data encoding schemes.
Abstract: The vast majority of optical links within the data center are based on vertical cavity surface emitting lasers (VCSELs) operating at 850 nm over multimode optical fiber. Deployable links have evolved in speed from 1 Gb/s in 1996 to 28 Gb/s in 2014. Serial data links at 40 and 56 Gb/s are now under development and place even more demand on the VCSEL and photodiodes. In this paper, we present the characteristics of VCSELs and photodiodes used in current generation 28 Gb/s links and present several methods to extend link distances using more advanced data encoding schemes. Finally, we will present results on wavelength division multiplexing on multimode optical fiber that demonstrate 40 Gb/s Ethernet connections up to 300 m on duplex OM3 optical fiber, and present results on fiber optimized for modal bandwidth in the 850 to 980 nm range.

218 citations


Authors

Showing all 900 results

NameH-indexPapersCitations
Yaron Silberberg8746228905
Ray T. Chen5488912078
Naresh R. Shanbhag493259202
N.A. Olsson381586360
Andrew C. Singer383026721
Jae-Hyun Ryou352605038
Joyce K. S. Poon331564184
Yasuhiro Matsui311432844
Ying Luo301052992
Lewis B. Aronson29742251
Thomas W. Mossberg291312611
Daniel Mahgerefteh25881830
Gil Cohen25722564
Christoph M. Greiner241001423
James A. Cox23721718
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20221
20213
202019
201929
201821
201743