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Project TitleHigh-speed Optical Sampling by Temporal Stretching using Fourwave Mixing
Track Code4669
Short Description

The inventors have developed a technique for ultrafast optical waveform sampling, which is based on temporal stretching the signal.

Abstract

The inventors have developed a technique for ultrafast optical waveform sampling, which is based on temporal stretching the signal. Temporal stretching is performed using a time-lens device, which is based on four-wave mixing in a nonlinear medium.

 

The stretching system has three main parts: input dispersive element, time lens, and output dispersive element. The signal is first passed through the input dispersive element. The dispersed signal is sent into the time lens which consists of a chirped pump pulse and a nonlinear medium. The chirped pump pulse is combined with the signal, and four-wave mixing process occurs in the nonlinear device, which results in the generation of a signal at a new optical frequency (idler). The idler is then spectrally separated from the signal and pump using a bandpass filter and is sent into the output dispersive element. The output dispersive element is longer than the input dispersive element and the temporal stretching factor is given by the ratio between the dispersions of these two elements.

 

This technique provides a tool for single-shot sampling of ultrafast optical waveforms with sub-picosecond resolution using conventional sampling devices. Single-shot waveform measurements, high-speed eye diagram analysis and performance monitoring, and large stretching factors up to 500 have been demonstrated. A silicon nanowaveguide was used as the nonlinear device and dispersion compensating fibers as the dispersive elements in order to demonstrate this technique. Other nonlinear devices such as other semiconductor waveguides and optical fibers can be used. Other dispersive devices such as fiber Bragg gratings, prisms, and gratings can be used.

 

Potential Applications

  • High-speed data and packet transmission system monitoring
  • Ultrafast optical waveform measurement
  • Characterization of single transient phenomena

 

Advantages

  • Ultrafast sampling
  • Increased optical fiber capacity
 
Tagsfiber optics, Optics & Photonics, physical science
 
Posted DateJul 24, 2012 8:14 PM

Researcher

Name
Reza Salem
Michal Lipson
Mark Foster
David Geraghty
Amy Foster (formerlyTurner)
Alexander Gaeta

Additional Information

Patent applications:  WO2010091180; CN102388298A; 20120093519

Licensing Contact

Patrick Govang
pjg26@cornell.edu
607-254-2330