Patent ID: 7720383
Filing Date: 2010-05-18
Classification: H04J,H04Q

Abstract:
1. An optical transmission apparatus comprising: a first wavelength selective switch for route switching, configured to selectively output signal light from a first input route to second through Nth output routes and to selectively output signal lights from second through Nth input routes to a first output route, depending on wavelength; a second wavelength selective switch for add and drop, configured to selectively output a signal light from an add port to the second through Nth output routes, and to the first output route via the first wavelength selective switch, depending on wavelength, and to selectively output the signal lights from the second through Nth input routes to a drop port and the signal light from the first input route to the drop part via the first wavelength selective switch, depending on wavelength; and an optical coupler configured to multiplex each of the signal lights output from the first wavelength selective switch to the second through Nth output routes and a corresponding one of the signal lights output from the second wavelength selective switch to the second through Nth output routes, and to send multiplexed signal light to another wavelength selective switch that is different from said first and second wavelength selective switches via one of the second through Nth output routes, and to branch and supply multiplexed signal light input from said second through Nth input routes to the first wavelength selective switch and the second wavelength selective switch, wherein the signal lights input and output by the first wavelength selective switch transmitted bidirectionally within a single optical transmission line and the signal lights input and output by the second wavelength selective switch are transmitted bidirectionally within a single optical transmission line.