Fujitsu To Release the World's Lowest Drive Voltage (4.0v) DQPSK LN Optical Modulator for 40 Gbps Optical Transmission Systems.Tokyo, Japan, Mar 27, 2007 - (JCN JCN Japan Corporate News
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JCN joint communications network (US DoD) Newswire) - Fujitsu Limited today announced the development of the world's lowest drive voltage DQPSK DQPSK Differential Quadrature Phase Shift Keying
DQPSK Differential Quaternary Phase Shift Keying  LN optical modulator An optical modulator is a device in which a signal-controlled element is used to modulate a beam of light.
40 Gbps core optical network systems are being increasingly deployed in response to dramatic increases in data transmission traffic brought about by the global expansion of broadband networks This article or section needs copy editing for grammar, style, cohesion, tone and/or spelling.
You can assist by [ editing it] now. . While many optical transmission signal encoding methods are under consideration, DQPSK transmission technology is becoming essential due to its strength against signal distortions resulting from transmission fibers and relay nodes, as well as its superior bandwidth efficiency The introduction to this article provides insufficient context for those unfamiliar with the subject matter.
Please help [ improve the introduction] to meet Wikipedia's layout standards. You can discuss the issue on the talk page. .
There has been growing demand for low drive voltage and broadband optical modulators required for the construction of commercial optical transmission systems. However, achieving both low drive voltage and broadband capabilities has been a major challenge for DQPSK compatible modulators, due in part to their complicated structures.
Now, Fujitsu Limited and Fujitsu Laboratories Ltd. have jointly developed technology to overcome this challenge, and Fujitsu will begin sales of a DQPSK low drive voltage LN modulator Modulator
Any device or circuit by means of which a desired signal is impressed upon a higher-frequency periodic wave known as a carrier. The process is called modulation. The modulator may vary the amplitude, frequency, or phase of the carrier. for commercial optical transmission systems.
1. Ultra Low 4.0 V Drive Voltage
Conventional LN modulators have required 20 Gbps high-speed electric signals of 10 V or higher in order to generate 40 Gbps DQPSK signals, and reducing the size and power consumption of drive circuits while maintaining reliability has been a challenge.
Fujitsu's new LN modulator achieves a drive voltage of 4.0 V, the lowest in the world, making it a practical optical modulator for use in commercial systems.
2. High-Quality DQPSK Signal Generation
In order to generate high-quality DQPSK signals, it is necessary to expand the bandwidth of optical frequency response. Using technology similar to that employed in previously commercialized 40 Gbps LN moderators, a 25 GHz bandwidth has been achieved.
3. User-friendly Interface
Positioning multiple high-speed electrical signal input terminals close together on one side of the modulator enables generation of DQPSK signals without the need to adjust for electrical signal lag on the drive circuit.
Furthermore, employing separate input terminals for the high-speed electrical signals mentioned above and the DC bias signals for controlling the modulator eliminates the need for an external electrical circuit to combine them.
Product samples of the new Fujitsu LN optical modulator will be on exhibit at the Optical Fiber Communication Conference and Exposition (OFC OFC Office
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NFOEC National Fiber Optic Engineers Conference ) 2007 in Anaheim, California, from March 27 - 29, 2007.
Sales Target: One billion yen in FY 2007 (year ending March 31, 2008).
 Differential Quadrature Phase Shift Keying (DQPSK): A method for modulating digital signals in which 2 bits of data are allocated to each of 4 modulated optical phases (0, 90, 180 and 270 degrees).
 LN optical Modulator: A device that converts an electrical data signal into an optical data stream via the electro-optic effect of a LiNbO3 crystal. There are intensity modulators for converting input electrical signals to optical intensity signals and phase modulators for converting them to optical phase signals. One of the LN modulator's features is modulation with minimal wavelength chirping chirp
A short, high-pitched sound, such as that made by a small bird or an insect.
intr.v. chirped, chirp·ing, chirps
To make a short, high-pitched sound. . This is a desirable characteristic for ultra high-speed, long haul, and DWDM (Dense WDM) The term given to wavelength division multiplexing (WDM) when significantly more channels were being added. Since WDM is increasingly more "dense" all the time, both terms are used synonymously. See WDM.
DWDM - wavelength division multiplexing (Dense Wavelength Division Multiplexing See WDM. ) transmission.
About Fujitsu Ltd
Fujitsu Limited (TSE See Tokyo Stock Exchange.
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.
Source: Fujitsu Ltd
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