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Optical frequency domain differential phase shift keying in femtosecond-pulse spectral modulation systems

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3 Author(s)
J. -K. Rhee ; NEC Res. Inst., Princeton, NJ, USA ; H. Kobayashi ; W. S. Warren

We propose a novel scheme of differential phase shift keying (DPSK) in the optical frequency domain. We take advantage of the intrinsic coherence among spectral elements derived by spectrum slicing a femtosecond optical pulse, introducing differential phase modulation between adjacent spectral elements with a femtosecond-pulse shaper. Detection of the differential phase is achieved by a Mach-Zehnder (MZ) or Sagnac interferometric receiver without requirement of any external phase reference

Published in:

Journal of Lightwave Technology  (Volume:15 ,  Issue: 12 )