| 摘要 |
PROBLEM TO BE SOLVED: To relax the limit of wavelength interval of a WDM signal in light branch and insertion.SOLUTION: A light branch device has a clock extractor for extracting a clock signal from a multi-channel optical signal containing a plurality of optical signals of different optical frequencies, a pulse generator generating a pulse signal in synchronism with the clock signal, an optical inverse Fourier transform section for transforming a multi-channel optical signal into a time-division multiplexed optical signal, and an optical switch for branching an optical signal existing in a time slot where the pulse signal is given, from the time-division multiplexed optical signal. |
