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Chromatic-dispersion monitoring using an optical delay-and-add filter

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2 Author(s)
Kuen Ting Tsai ; Dept. of Commun. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan ; W. I. Way

A novel postdetection method based on an optical delay-and-add filter (DAF) is proposed for dispersion monitoring at 40 Gb/s or beyond. The proposed method can be used with or without a pilot tone and works well even when there exists a residual chirp due to the finite direct current (DC) extinction ratio of a Mach-Zehnder (MZ) modulator or self-phase modulation (SPM). Several modulation formats, including conventional nonreturn to zero (NRZ), return to zero (RZ), carrier-suppressed RZ (CSRZ), RZ differential phase shift keying (RZ-DPSK), and CSRZ-DPSK are used to numerically demonstrate the feasibility of this technique without using a pilot tone.

Published in:

Journal of Lightwave Technology  (Volume:23 ,  Issue: 11 )