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Advantest Introduces the Q8480 Dispersion Optical Time-Domain Reflectometer
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World's First Measuring Instrument for Optical Fiber Chromatic Dispersion Maps
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Q8480
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TOKYO, Japan, July 10, 2002 - Advantest Corporation (TSE: 6857, NYSE: ATE) introduced today their Q8480 Dispersion Optical Time-Domain Reflectometer (D-OTDR), which was designed to help ensure highly precise chromatic dispersion management for production of new optical fibers, installation of new optical transmission links, and bandwidth expansion of existing optical networks. Advantest will display the Q8480 at InterOpto 2002, a four-day exhibition on the latest in optoelectronic technologies to be held from July 16th to the 19th at the Makuhari Messe convention center in Chiba Prefecture, Japan.
To deal with the growth in Internet traffic, fiber optical systems have been making the transition from 2.5 to 10 and even 40Gbps bit rates and, through the use of wavelength division multiplexing (WDM), existing optical networks are being outfitted to provide expanded bandwidth. Unfortunately, as bit rates accelerate and as the number of channels within a fiber increases, chromatic dispersion--the scattering of a signal as it propagates through a fiber--becomes the prime factor behind deteriorating signal quality. Moreover, this problem only exacerbates itself the longer the transmission link gets, which put significant limitations to its possible length.
Thus, to create future broadband networks, it is crucial that engineers are capable of accurately measuring the chromatic dispersion of the entire transmission link so that they can compensate for chromatic dispersion as the network is being built.
Under the standard method for measuring chromatic dispersion, which necessitates connecting both the transmitting and receiving end of the transmission link to the test instrument, up until now it was only possible to measure the link's accumulated, or "total chromatic dispersion". In addition to total chromatic dispersion, however, the Q8480 is the first test instrument to also provide the ability to measure chromatic dispersion maps--the arrangement of different fibers within a link that have been joined together so that their opposite types of chromatic dispersion can cancel each other out. Also, because the Q8480 only needs to be connected to one end of the link, it greatly simplifies the previously cumbersome task of measuring the chromatic dispersion maps of links that have already been installed.
Along with the aforementioned ability to measure dispersion maps and thus provide in-depth characterization of transmission links, the Q8480 also sports a measuring accuracy of less than +/-4.5%. In addition, the Q8480 has a wide wavelength setting range of 1530.5nm to 1559.5nm, which allows operators to create a variety of different wavelengths for their chromatic dispersion measurements. Finally, thanks to a display screen that allows four separate waveforms to be displayed simultaneously, the operator will be able to easily compare how different wavelengths effect their dispersion maps.
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Chromatic dispersion map accuracy:
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4.5%
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Spatial resolution
(when measuring chromatic dispersion):
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Minimum 150m
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Dead zone
(when measuring chromatic dispersion):
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Minimum 100m
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Wavelength range:
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1530.5nm to 1559.5.nm
(when measuring fibers with a 0.5nm wavelength interval)
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Wavelength setting resolution:
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0.1nm
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Maximum measurable length:
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Over 40km
(when measuring a single mode fiber)
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Measurement time:
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Approx. 2 min.
(when measuring a 40km single mode fiber)
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General specifications for OTDR unit:
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Dimensions - Approx. 424mm(w)x256mm(h)x500mm(d)
Mass - 25kg or less
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General specifications for light source unit:
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Dimensions - Approx. 424mm(w)x132mm(h)x500mm(d)
Mass - 27kg or less
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