Data Sheets
81490A Reference Transmitter
The Keysight Technologies, Inc. 81490A Reference Transmitter is designed to offer excellent eye quality as a reference for testing 10GbE -LR/-ER, 10G Fibre Channel and short reach transceivers, such as 10GBase-SR, 40GBase-SR4, 100GBase-SR10 and according to 10 GFC Fibre Channel specifications. The modules are fully integrated into the industry standard Lightwave Measurement System (LMS) 816xB platform.
The Reference Transmitter is available for Multimode 850 nm and Singlemode 1310 nm/1550 nm applications. Offering both 1310 nm and 1550 nm in one module gives the fastest reconfiguration between these two transmission bands without reconnecting. The integration in the LMS mainframe offers an integration of the reference transmitter into the N4917A stressed eye software package. Of course a separate usage of the transmitter is also supported with SCPI language.
The separation of the signal source and the modulator is the only way to offer a zero-chirp modulation. This is essential for a clean and repeatable eye diagram when modulating with an appropriate clean external source to fulfill the requirements of the IEEE standard. Another advantage of this design compared to directly modulated transmitters is the wide extinction ratio range that can only be achieved with this design.
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