Title :
Chromatic-dispersion monitoring using an optical delay-and-add filter
Author :
Tsai, Kuen Ting ; Way, Winston I.
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan
Abstract :
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.
Keywords :
Mach-Zehnder interferometers; differential phase shift keying; monitoring; optical fibre communication; optical fibre dispersion; optical filters; self-phase modulation; 40 Gbit/s; CSRZ-DPSK; Mach-Zehnder modulator; RZ differential phase shift keying; carrier-suppressed RZ; chromatic-dispersion monitoring; finite direct current extinction ratio; nonreturn to zero; optical delay-and-add filter; residual chirp; return to zero; self-phase modulation; Chromatic dispersion; Delay; Fiber nonlinear optics; High speed optical techniques; Monitoring; Optical fiber dispersion; Optical filters; Optical interferometry; Optical modulation; Optical receivers; Automatic dispersion equalization; fiber chromatic dispersion; optical performance;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.856230
