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N4391B Optical Modulation Analyzer

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KeysightCare

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N4391C Optical Modulation Analyzer

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Highlights

Compact tool for complex modulated optical signals

The Keysight N4391B Optical Modulation Analyzer enables development of the coherent technologies required to achieve the next level of performance in modern communication systems such as between, and in, datacenters. It consists of a UXR real-time oscilloscope and a calibrated coherent optical receiver. The N4391B builds on the UXR oscilloscope series’ noise performance and Keysight’s reliable and flexible vector signal analysis (VSA) software.

The most compact OMA solution of its class, the N4391B not only solves your coherent measurement problems but also makes your test equipment decision easier and protects your investment: it provides two paths of upgradability that can be accomplished in minutes through the installation of licenses.

While complex modulated signals are commonly used in long-distance transmission across DWDM links, newly proposed technologies for intra-datacenter interconnect use the coherent approach in the O-band, addressing the higher data rate need with improved power efficiency. Keysight now provides OMA coherent receivers for the O-band in addition to the current coherent receivers that work in the C-band and L-band.

Applications

The ever-growing demand for higher transmission capability drives symbol rates on an ever-increasing trajectory. Yesterday’s systems at 64 GBaud are yielding to newly proposed ones at 124 GBaud and beyond to 200 GBaud. The Keysight N4391B helps you keep pace with this evolution that demands test equipment that can handle the symbol rate classes of transceivers for 800 Gb/s, 1.2 Tb/s to 1.6 Tb/s, from the first day in advanced research through the development phase.

Not only symbol rates are challenging, but also modulation formats are getting more demanding due to the higher-order quadrature amplitude modulation which requires a step up in noise performance. The N4391B meets this challenge with the UXR’s Effective Number of Bits performance having an ENOB of 5.4.

The Keysight N4391B provides an operating bandwidth up to 110 GHz and a myriad of options for selecting modulation formats. Even user-defined modulation formats are supported through an additional option, and all at an outstanding high ENOB at highest bandwidths.

Bandwidth upgradability

The N4391B is offered in two versions of optical coherent receivers: one is calibrated to 70 GHz operation and equipped with 1.85 mm connectors. It is available in C-band and O-band variants. A second one is factory calibrated to 110 GHz and equipped with 1.0 mm connectors. The bandwidth of operation is dependent on the oscilloscope bandwidth and the coherent receiver bandwidth chosen.

Each of the N4391B's configurations are upgradable to higher bandwidths: configurations based on the 1.85 mm connector can be upgraded from 40 GHz to 50 GHz, or 59 GHz, up to 70 GHz, while configurations based on the 1.0 mm connector can be upgraded from 40 GHz to 59 GHz, 70 GHz, 80 GHz, 100 GHz, up to 110 GHz. There are even configurations possible that feature different bandwidths for electrical and optical measurements.

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