Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 58: Optische Meßtechnik & Präzisionsmessungen II

Q 58.1: Vortrag

Dienstag, 8. März 2005, 17:00–17:15, HU 2002

Investigation of high-bit-rate data streams: linear versus nonlinear optical sampling — •Erik Benkler and Harald R. Telle — Physikalisch-Technische Bundesanstalt, Braunschweig

New ultrafast measurement techniques for the characterization of optical data streams are essential for the development of future optical networks operating at bit rates above 80GBit/s. Optical data sampling is required since the bandwidth of the fastest electronic detection schemes is exceeded.

We have implemented both a nonlinear and a linear optical sampling oscilloscope (OSO) with a temporal resolution better than 100 fs. The nonlinear OSO employs intensity cross-correlation by sum frequency generation in a nonlinear optical crystal for optical sampling. Its limited efficiency is avoided in the linear OSO, utilizing the field cross-correlation by detection of the amplitude of the frequency-stabilized carrier beat note between data stream and sampling signal.

Data streams are usually characterized by eye diagrams which are recorded by scanning the delay time between sampling pulses and data bits. In conventional approaches, the sampling pulses continuously sweep over the data bits. The novel scheme presented here, however, employs a tight synchronization between data bits and sampling pulses, opening up new possibilities for bit error detection.