| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical add/drop multiplexer capable of dealing with a small number of wavelengths at the time of initial introduction, then performing multi-wavelength compatible function expansion and performing function expansion to a wavelength cross connect function without interrupting transmission signals. <P>SOLUTION: A core unit 21a arranged in a transmission path includes a through path for causing input light to an input port to pass through to an output port, a drop-side port 25a that drops the input light having a predetermined wavelength, and an add-side port 25b that adds signal light having a predetermined wavelength to the input light. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
