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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 22,
  • Issue 3,
  • pp. 733-
  • (2004)

A Quaternary Amplitude Shift Keying Modulator for Suppressing Initial Amplitude Distortion

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Abstract

This paper proposes a quaternary amplitude-shift-keying (4ASK) modulation circuit that suppresses amplitude distortion of the transmitting 4ASK signal. The performance of the proposed circuit is quantitatively verified through numerical calculation in comparison to a conventional alternative. The feasibility of the proposed circuit as integrated in a lithium niobate substrate is also demonstrated: the suppression of amplitude distortion is successfully demonstrated and minimum sensitivity of the transmitted 4ASK signal is 1.7 dB better than that offered by the conventional circuit.

© 2004 IEEE

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