We demonstrated variable dispersion compensation using the virtually Imaged Phased Array (VIPA) for a 40-Gbit/s dense-WDM transmission system. The large tunable range of -800 to +800 ps/nm in the entire C-band wavelength range and the high tunable resolution of 1 ps/nm were achieved. We adopted the dispersion monitor of 40-GHz intensity extracted from the received 40-Gbit/s baseband signals. Using the VIPA variable dispersion compensator and the dispersion monitor, we demonstrated 1.28-Tbit/s (40-Gbit/s × 32 ch) automatic dispersion compensation. As a result, we confirmed that only two VIPAs and one fixed dispersion compensating fiber (DCF) are needed to make our method applicable to the entire C-band for dense WDM 40-Gbit/s systems having a large transmission range of 80 km.
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