| 摘要 |
PURPOSE: A wavelength division access device using a long-period grid is provided to cancel an optical signal with a wavelength branched to an other side and improve an isolation by installing the long-period grid between an interleaver and a WDM(Wavelength Division Multiplexer). CONSTITUTION: An interleaver(21) bisects a plurality of channels into the same number of channels, and outputs the bisected signals. The first WDM(22) bisects one output signal of the interleaver(21) into the same number of channels, and outputs the bisected signals. The second WDM(23) bisects the other output signal of the interleaver(21) into the same number of channels, and outputs the bisected signals. A plurality of long-period grids(24,25) are installed between the interleaver(21) and the first WDM(22) for restraining a band using a wavelength inputted to the second WDM(23) as a central wavelength. A plurality of long-period grids(26,27) are installed between the interleaver(21) and the second WDM(23) for restraining a band using a wavelength inputted to the first WDM(22) as a central wavelength. |
