An optical signal processor comprises optical input/output means, a first optical system, wavelength branching means, a second optical system, and reflecting means. The optical input/output means includes a plurality of input/output ports. The ports have respective light input/output directions, in parallel...http://www.google.com.hk/patents/US20040076368?utm_source=gb-gplus-share專利 US20040076368 - Optical signal processor
