Composite light dispersion for compensating device and method for compensating light dispersion using the device

摘要

In conventional optical communication at a communication bit rate of 10 Gbps or above, especially 40 Gbps or above, wavelength dispersion takes place in a signal propagated through an optical fiber to cause a significant problem in communication. A composite light dispersion compensating device of the invention comprises a light dispersion compensating element where a reflector or a mutilayer film element is opposed to the incident face of a mutilayer film element which can compensate dispersion utilizing group velocity delay time-to-wavelength characteristics. A light dispersion compensating device having a group velocity delay time-to-wavelength characteristic curve having a wide bandwidth and a large extreme value of the group velocity delay time can be also realized by connecting a plurality of dispersion compensating elements in series. Dispersion can be compensated for each channel or a plurality of channels.