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Pulse compression in nonlinear periodic structures

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Abstract

In current techniques for optical pulse compression, a pulse chirped by self-phase modulation in an optical fiber is subsequently compressed on passage through a delay line that has negative group velocity dispersion (GVD).1 When the fiber itself has negative GVD, which is the case for wavelengths longer than 1.3 μm, no external delay line is required. Compression in that case results from a subtle interplay of nonlinearity and negative dispersion that leads to soliton formation.2 In this paper, we show that periodic structures (e.g., phase gratings) when embedded in an optical fiber can alter the fiber dispersion characteristics so that pulse compression without an external delay line becomes possible even for wavelengths shorter than 1.3 μm.

© 1985 Optical Society of America

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