Friday, October 09, 2015
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Apple Removes Apps From Online Store
PC Shipments Kept Falling In 3Q
Apple Says Battery Tests For iPhone 6s Lineup May Be Misleading
Qualcomm Showcases 24-core Server Chip
AT&T Customers Allowed To Make Calls Over Wi-Fi
Amazon Launches App Developing Platform For IoT
18.4-inch Samsung Galaxy View Tablet Passes FCC Certification
Facebook to Test Emoji Icons
Active Discussions
How to back up a PS2 DL game
Copy a protected DVD?
roxio issues with xp pro
How to burn a backup copy of The Frozen Throne
Help make DVDInfoPro better with dvdinfomantis!!!
Copied dvd's say blank in computer only
menu making
Optiarc AD-7260S review
 Home > News > General Computing > Fujitsu...
Last 7 Days News : SU MO TU WE TH FR SA All News

Monday, September 26, 2011
Fujitsu Develops Distortion-Compensation Circuit For Fiber-Optic Transmission Systems

Fujitsu Limited, Fujitsu Laboratories Limited and Fujitsu Research and Development Center Co., Ltd. of China jointly announced their development of a digital signal processing algorithm to compensate for waveform distortions in signals transmitted by fiber-optic cables in long-haul transmission systems of 100 km or more.

Wavelength division multiplexed (WDM) fiber-optic transmission systems that can carry 100 Gbps per wavelength?more than ten times existing levels?are expected to go into volume commercial deployment around 2012, and R&D efforts are progressing to enable continuous capacity increases in the future.

When transferred over long distances of hundreds of kilometers by fiber-optic lines, ultrafast signals carrying data at speeds of 100 Gbps or more suffer from waveform distortion caused by nonlinear optical effects, making it difficult for the signal to be correctly received. This has prompted research into nonlinear compensation technology, which can restore the signal received with distortion to a clean waveform. Using conventional methods, however, the implementation of nonlinear compensation technology would require massive circuits with more than 100 million logic gates, and chips that include such compensation circuits are only expected to become feasible around 2020. Reducing the scale required of such circuits, therefore, has been a pressing issue.

In September of last year, Fujitsu developed a technology that would simplify these circuits, making them commercially viable as early as 2015. With the relentless growth in network traffic, however, ongoing improvements, in terms of circuits that are more compact and consume less electricity, are still needed. The Fujitsu team has now developed a new signal-processing algorithm that, while retaining the distortion-correction performance of the technology developed last year, slashes the number of stages required in a distortion-compensation processing circuit to about one-seventh current typical levels. Key features of this technology are as follows.

- As a result of approximation analysis, in which signal distortions are expressed as mathematical models, Fujitsu has been able to formulate distortion components that previous technologies have overlooked.

- Additional refinements to the above numerical modeling made it possible to develop an efficient design for accurate compensation, implemented in a small circuit. Adding this compensation circuit to the technology that Fujitsu developed in September last year resulted in a leap forward in the accuracy of distortion compensation and greatly reduced the number of circuit stages and overall size.

Compared to conventional technology in widespread use in literatures, the size and power requirements of the new circuit are reduced by approximately 85%, and are reduced by approximately 50% compared to circuits previously developed by Fujitsu.

For long-haul transmission systems that are used in the trunk-line networks of telecom carriers and networks that tie together large datacenters, the new circuit will enable ultrafast transmission systems operating at over 100 Gbps per wavelength to be more compact and consume less power than existing systems.

Some of this research was conducted as part of the "Universal Link Project R&D" sponsored by National Institute of Information and Communications Technology (NICT), Japan. Details of this technology are being presented at the 37th European Conference and Exhibition on Optical Communication (ECOC2011), opening September 18 in Geneva.

This technology is expected to be used in the next generation of long-haul optical transmission systems running at speeds in excess of 100 Gbps that are on track for implementation by around 2015. The technology is also being studied for potential applications in high-capacity short-range networks, such as those used in datacenters and access networks.

Oracle to Integrate Canon's Imaging Technologies        All News        AMD Delivers Multi-Display Support On Latest Entry-Level Embedded Discrete GPU
Oracle to Integrate Canon's Imaging Technologies     General Computing News      Samsung to Take Bolder Stance in Apple Patent Battle

Get RSS feed Easy Print E-Mail this Message

Related News
Fujitsu Achieves High Recognition Rate for Handwritten Chinese Characters
Fujitsu Receiver Could Enable Smartphones To Wirelessly Receive 8K HD Video Instantly
Fujitsu Doubles Same-Cell Wireless Communication Capacity for 5G
New User Interface Technology Converts Entire Rooms into Digital Spaces
Fujitsu Laboratories Use Supercomputer for Real-Time Disaster-Recovery Scheduling
Fujitsu ETERNUS DX8000 S3 Disk Storage Systems Aim At mainframes And Open Systems
Fujitsu Data Transfer Technology Speeds up Remote File Access
Fujitsu Develops Virtualization Technology To Secure Web Applications
New Fujitsu ARROWS NX F-04G Smartphone Supports Iris Authentication
Fujitsu and Intel To Collaborate On IoT Platform
Fujitsu Releases Head Mounted Display For On-Site Operations
Fujitsu Technology Supports Large-Screen Virtual Desktops on Existing Network Infrastructure

Most Popular News
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2015 - All rights reserved -
Privacy policy - Contact Us .