In-line chromatic dispersion monitoring using optically-added phase modulate in-band for 10 Gb/s system

We demonstrate a novel in-line dispersion monitoring technique using phase modulated in-band subcarrier tones. Our technique has no subcarrier-subcarrier tones. Our technique has no subcarrier to-data crosstalk, high sensitivity, and large monitoring range. A >3400 ps/nm monitoring range and <9 (ps/nm)/dB sensitivity are shown for a 10-Gb/systm.