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Optical-signal-processing device based on waveguide-type variable delay lines and optical gates

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3 Author(s)
Takiguchi, K. ; NTT Photonics Labs., NTT Corp., Kanagawa, Japan ; Itoh, M. ; Shibata, T.

In this paper, an optical-signal-processing device mainly designed for time-slot switching is demonstrated. The device is composed of variable delay-line arrays fabricated by planar lightwave circuit technology and high-speed optical gates. The variable delay-line arrays consist of transversal-form or lattice-form optical circuits. The operating principle is based on serial-to-parallel conversion, adjustment of the delay time between the parallel signals, and the gating of the optical bits or packets in the optical region. The device does not require any interaction between lightwaves through optical nonlinear effects or filter banks for code matching. As an example of its operation, label-processing functions are demonstrated, specifically the label swapping of optical return-to-zero pulses. The merits of the proposed device are described and problems that must be solved are also discussed.

Published in:

Lightwave Technology, Journal of  (Volume:24 ,  Issue: 7 )

Date of Publication:

July 2006

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