payload with the 1.244-Gb/s label was demonstrated. The results showed small power penalty as much as 0.2 dB in payload transmission, which arises from crosstalk with the label, and the CS-SH-SCM labeling technique showed increased capability for multiple-span transmission of the payload with successive label swapping. ACKNOWLEDGMENTThis work was partially supported by the Korean Science and Engineering Foundation (KOSEF) through the OIRC project.

Abstract-In this letter, 40-Gb/s return-to-zero data wavelength conversion is demonstrated using cross-phase modulation in an optical fiber with subsequent conversion of phase modulation to amplitude modulation using an optical filter. The scheme is potentially ultrahigh speed and can be made polarization independent.

Optical packet switching promises to bring the flexibility and efficiency of the Internet to transparent optical networking with bit rates extending beyond that currently available with electronic router technologies. New optical signal processing techniques have been demonstrated that enable routing at bit rates from 10 Gb/s to beyond 40 Gb/s. In this article we review these signal processing techniques and how all-optical wavelength converter technology can be used to implement packet switching functions. Specific approaches that utilize ultra-fast all-optical nonlinear fiber wavelength converters and monolithically integrated optical wavelength converters are discussed and research results presented.

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