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All-optical, wavelength and bandwidth preserving, pulse delay based on parametric wavelength conversion and dispersion

Jay E. Sharping, Yoshitomo Okawachi, James van Howe, Chris Xu, Yan Wang, Alan E. Willner, and Alexander L. Gaeta

Open Access Open Access

Abstract

We demonstrate an all-optical tunable delay in fiber based on wavelength conversion, group-velocity dispersion, and wavelength reconversion. The device operates near 1550 nm and generates delays greater than 800 ps. Our delay technique has the combined advantages of continuous control of a wide range of delays from picoseconds to nanoseconds, for a wide range of signal pulse durations (ps to 10 ns), and an output signal wavelength and bandwidth that are the same as that of the input. The scheme can potentially produce fractional delays of 1000 and is applicable to both amplitude- and phase-shift keyed data.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Schematic of the continuously tunable optical delay generator. FPC, fiber polarization controller; det, detector.

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Fig. 2.
Fig. 2. Experimental results for the all-optical delay. (a) Plotted on the left axis are the measured (points) along with a linear fit (line). Plotted on the right axis is the expected parametric gain as a function of pump wavelength. (b) Corresponding measured temporal traces, as recorded with a 10-GHz detector, of signal pulses for the data points shown in (a).

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Fig. 3.
Fig. 3. Measured optical spectra for the signal pulses at the input (solid line) and output (dot-dash line) of the delay generator.

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Fig. 4.
Fig. 4. Plots of bit-error rate (BER) as a function of received power for the simulated system. Results indicate that a system operating at 10 Gb/s will experience a power penalty of 3 dB. Shown also are simulated eye diagrams for the back-to-back signal as well as the converted signal for two different pump wavelength settings.

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