Abstract
AbstractSymmetric Mach‐Zehnder (SMZ) type all‐optical switches, namely, the SMZ, polarization‐discriminating SMZ (PD‐SMZ), and delayed interference signal wavelength converter (DISC), are described in detail. All of these all‐optical switches are characterized by push–pull operation and allow ultrafast switching not limited by the relaxation time of high‐efficiency nonlinear optical materials that are suitable for low‐power operations. They make possible a low‐chirp switching window of a quasi‐square type that is important in practice. Ultrafast all‐optical signal processing with an SMZ, namely, 168 → 10.5 Gbit/s error‐free DEMUX (using a hybrid‐integrated SMZ, HI‐SMZ), zero‐penalty optical signal pulse regeneration at 84 and 168 Gbit/s, and error‐free all‐optical wavelength conversion are reported. In experiments with pulse regeneration and wavelength conversion, the error rate is evaluated after DEMUX to 10.5 Gbit/s by HI‐SMZ because the signal light after signal processing has ultrahigh speed. © 2002 Scripta Technica, Electron Comm Jpn Pt 2, 85(2): 1–17, 2002
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