OPTICAL DISPERSION COMPENSATING DEVICE AND OPTICAL DISPERSION COMPENSATING METHOD USING THE DEVICE

摘要

An optical dispersion compensating device which eliminates a serious communication trouble caused by wavelength dispersion encountered in a signal transmitting over an optical fiber in an optical communication having a communication bit rate of at least 10 Gbps, especially at least 40 Gbps, which is large in bandwidth and in polar zone for a group velocity delay time, which is produced by serially connecting a plurality of multi-layer-film elements capable of dispersion compensating by using group velocity delay time-wavelength characteristics, and which is used, after various selections for connecting, to subject to cubic dispersion compensating an optical signal having a wide wavelength band containing a wavelength band of 1260-1700 nm.