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Yokogawa and Fujitsu Develop 40 Gbps DQPSK Optical Transmission Technology; New Technology Enables Ultra High-capacity Inter-city Optical Networks.



Tokyo, Japan, Apr 5, 2007 - (JCN JCN Japan Corporate News
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 Newswire) - Yokogawa Electric This article or section needs sources or references that appear in reliable, third-party publications. Alone, primary sources and sources affiliated with the subject of this article are not sufficient for an accurate encyclopedia article.  Corporation and Fujitsu Limited today announced the joint development of the world's first practical 40 Gbps optical transmission technologies using differential quadrature phase Communication signals often have the form:

    [1]

where
 shift keying (DQPSK DQPSK Differential Quadrature Phase Shift Keying
DQPSK Differential Quaternary Phase Shift Keying
)[1]. The two companies are respectively planning to incorporate the technologies in various new products for 40 Gbps ultra high-speed optical transmission networks.

The new technologies were developed under the strategic partnership established between Yokogawa and Fujitsu in March of 2006 to jointly develop core system technologies and key components for ultra high-speed optical transmission systems, and with the cooperation of Fujitsu Laboratories Ltd. Sample products were on display at the Optical Fiber Communication Conference and Exposition (OFC OFC Office
OFC Officer
OFC Of Course
OFC Oxygen Free Copper
OFC Oceania Football Confederation (soccer)
OFC Optical Fiber Cable
OFC Optical Fiber Communications
OFC Optical Fiber Conference
) and the National Fiber Optic Engineers Conference (NFOEC NFOEC National Fiber Optical Engineer Conference
NFOEC National Fiber Optic Engineers Conference
) 2007, held in Anaheim, California “Anaheim” redirects here. For Annaheim, see Annaheim, Saskatchewan.

Anaheim is a city in Orange County, California, located 28 miles southeast of Los Angeles.
 from March 27 - 29, 2007.

Background of Development

The dissemination of optical access networks that directly connect households via optical fibers and the construction of next generation networks have led to a increasing demand for greater capacity in inter-city optical transmission networks. In order to meet this demand, increasing the maximum transmission speed from 10 Gbps used in current optical transmission systems to 40 Gbps is being considered.

Overview of Development Challenge

Typically, when transmission speed is increased, distortion caused by polarization mode dispersion Polarization mode dispersion (PMD) is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses.  (PMD (Polarization Mode Dispersion) The type of dispersion that occurs in singlemode fiber due to a lack of perfect symmetry in the fiber and from external pressures on the cable. Light travels over singlemode fiber in two polarization states. )[2] becomes pronounced, limiting transmission reach. For example, in the case of transmission of a 40 Gbps signal using a standard binary modulation[3] in an optic fiber that meets the PMD specification recommended by the ITU-T See ITU.

ITU-T - International Telecommunications Union
[4] transmission reach is limited to a maximum of 100 km. Thus, inter-city transmission, which requires long-distance transmission of more than several hundred kilometers, has not been possible.

Seeking to overcome this obstacle, advances are being made in investigating DQPSK-type transmission, which is tolerant to waveform distortion due to PMD, and its high performance has been confirmed in the laboratory experiments. However, the configuration of a DQPSK format is complex, and thus large size and high power consumption of the optical transceivers have proved to be challenges.

The Newly Developed Technologies

Yokogawa Electric and Fujitsu Limited, in cooperation with Fujitsu Laboratories Ltd, have successfully developed the world's first practical 40 Gbps DQPSK optical transmission technologies:

1. DQPSK LN Optical Modulator An optical modulator is a device in which a signal-controlled element is used to modulate a beam of light.

See:
  • Electro-optic modulator, exploiting the electro-optic effect
  • Acousto-optic modulator
:

The LN optical modulator[5] for DQPSK modulation, which was developed by Fujitsu and operates with the world's lowest drive voltage, enables a compact optical transmission component design and lower power consumption.

2. Dedicated ICs and Devices that Enable DQPSK:

Compact, low power consumption dedicated ICs and other devices that enable DQPSK, including a driver device optimized for the DQPSK LN optical modulator mentioned above, optical / electrical conversion devices that operate stably despite PMD waveform distortion, and clock and data recovery devices, were developed with Yokogawa Electric's InP HBT HBT Heterojunction Bipolar Transistor
HBT HyCult Biotechnology (Uden, The Netherlands)
HBT Hanbury-Brown-Twiss (interferometer)
HBT Herring Bone Twill
HBT Heflex Bioengineering Test
[6] technology.

3. Compact Optical Transmission Module:

Control technology was developed that allows the newly developed key devices to operate in a stable manner as well as mounting technology that enables a compact size, making possible a compact 110 mm x 320 mm x 40 mm package equipped with all functions necessary for 40 Gbps DQPSK in the transmission equipment and a low-power consumption of 35 W (with case temperature of 72 C).

Results

100 units of 40 Gbps DQPSK optical transceivers were manufactured and transmission performance and stable operation despite environmental changes, such as temperature fluctuations and variations in supply voltages, was confirmed. Furthermore, the transmission reach as limited by PMD was found to be approximately eight times better than that of standard binary modulation.

The resulting technology is expected to significantly reduce the time it will take to implement major inter-city high-capacity optical networks.

Moving Forward

Utilizing the newly developed technology, Yokogawa Electric and Fujitsu are respectively planning to bring various products for 40 Gbps ultra high-speed optical transmission networks to the market.

Notes:

[1] Differential Quadrature Phase Shift Keying (DQPSK): A modulation method for digital signals whereby 2 bits of data are allocated to each of four modulated mod·u·late  
v. mod·u·lat·ed, mod·u·lat·ing, mod·u·lates

v.tr.
1. To adjust or adapt to a certain proportion; regulate or temper.

2.
 optical phases. The use of four types of optical phases enables a pulse width pulse width Pulse duration Cardiac pacing The duration of a pacing pulse in msecs  that is double that of the binary modulation scheme, reducing the effect of waveform distortion due to PMD.

[2] Polarization Mode Dispersion (PMD): Phenomenon in which light travels at different speeds in the two polarization modes of an optical fiber causing signal distortion at the optical receiver.

[3] Binary Modulation: A modulation method whereby the digital singles "0" and "1" are assigned to either "bright" or "dark" optical signals, or to "0 degrees" or "180 degrees" optical phases.

[4] International Telecommunication Union International Telecommunication Union (ITU), specialized agency of the United Nations, with headquarters at Geneva. It was created in 1934 as a result of the merging of the International Telegraph Union (est.  - Telecommunication standardization sector (ITU-T): An international organization that produces standards in the telecommunications field.

[5] LN Optical Modulator: A device that converts an electrical data signal into an optical data stream via the electro-optic effect The electro-optic effect is a change in the optical properties of a material in response to an electric field that varies slowly compared with the frequency of light. The term encompasses a number of distinct phenomena, which can be subdivided into
 of a LiNbO3 crystal. For more detailed information, please refer to the press release on March 27, 2007.

[6] InP Hetero-Junction Bipolar Transistor (electronics) bipolar transistor - A transistor made from a sandwich of n- and p-type semiconductor material: either npn or pnp. The middle section is known as the "base" and the other two as the "collector" and "emitter".  (InP HBT): A compound semiconductor transistor with outstanding high-speed performance and high drive capability with low IC power consumption.

About Fujitsu Ltd

Fujitsu Limited (TSE See Tokyo Stock Exchange.

TSE

1. See Tokyo Stock Exchange (TSE).

2. See Toronto Stock Exchange (TSE).
: 6702; ADR ADR - Astra Digital Radio : FJTSY) is a leading provider of customer-focused IT and communications solutions for the global marketplace. Pace-setting device technologies, highly reliable computing and communications products, and a worldwide corps of systems and services experts uniquely position Fujitsu to deliver comprehensive solutions that open up infinite possibilities for its customers' success. Headquartered in Tokyo, Fujitsu reported consolidated revenues of about 4.8 trillion yen (US$40.6 billion) for the fiscal year ended March 31, 2006. For more information, please visit www.fujitsu.com.

About Yokogawa Electric

Yokogawa's (TSE: 6841) global network of 20 manufacturing facilities, 80 companies, and more than 650 sales and engineering offices spans 31 countries. Since its founding in 1915, the US$4 billion company has been engaged in cutting-edge research and innovation, securing more than 7,000 patents and registrations, including the world's first digital sensors for flow and pressure measurement. Industrial automation and control, test and measurement, information systems and industry support are the core businesses of Yokogawa. For more information about Yokogawa, please visit our web site at http://www.yokogawa.com.

Source: Fujitsu Ltd

Contact:
Press Contacts

Yokogawa Electric Corporation
Public Relations & Investor Relations
Tel: +81-422-52-5530

Fujitsu Limited
Public and Investor Relations
Tel: +81-3-6252-2176
Fax: +81-3-6252-2783
https://www-s.fujitsu.com/global/news/contacts/inquiries/index.html

Customer Contacts

Yokogawa Electric Corporation
Photonics Business Headquarters
Marketing Department
Tel: +81-42-770-6811

Fujitsu Limited
Photonic Systems Group
Photonic Systems Design Department I
Tel: +81-44-754-3131
E-mail:contact-photonicsinfo@cs.jp.fujitsu.com


Copyright [c] 2007 JCN Newswire. All rights reserved. A division of Japan Corporate News Network K.K.
COPYRIGHT 2007 Japan Corporate News Network K.K.
No portion of this article can be reproduced without the express written permission from the copyright holder.
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