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Applied Optics

Applied Optics


  • Vol. 36, Iss. 15 — May. 20, 1997
  • pp: 3425–3429

Ultrafast optical pulse digitization with unary spectrally encoded cross-phase modulation

P. P. Ho, Q. Z. Wang, J. Chen, Q. D. Liu, and R. R. Alfano  »View Author Affiliations

Applied Optics, Vol. 36, Issue 15, pp. 3425-3429 (1997)

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A method to digitize the intensity of ultrashort laser pulses for high-speed optical signal processing is described. This digitization was based on the spectral broadening of a weak probe (carrier) pulse by a more intense pump (signal) pulse through the nonlinear optical process of cross-phase modulation (XPM). The signal pulse intensity was varied to generate different spectral widths that can be encoded into digital form. Using a 50-ps time-divided multiplexing pulse train with a waveguide splitter, combiner, and an array of fibers with variable lengths, a unary XPM encoding approach is demonstrated. The spectral encoding scheme can be used to achieve a 5-GHz sampling rate at a 16-level accuracy.

© 1997 Optical Society of America

Original Manuscript: November 20, 1995
Revised Manuscript: September 13, 1996
Published: May 20, 1997

P. P. Ho, Q. Z. Wang, J. Chen, Q. D. Liu, and R. R. Alfano, "Ultrafast optical pulse digitization with unary spectrally encoded cross-phase modulation," Appl. Opt. 36, 3425-3429 (1997)

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