Patent ID: 6493481
Filing Date: 2002-12-10
Classification: H04Q

Abstract:
A KÃ—K optical switch unit comprising:a first (1st) stage optical matrix switch group which is comprised of a plurality of 1Ã—M optical matrix switches connected in parallel; a second (2nd) stage optical matrix switch group which is comprised of a plurality of NÃ—N optical matrix switches connected in parallel and connected with said 1st stage optical matrix switch group; a third (3rd) stage optical matrix switch group which is comprised of a plurality of MÃ—1 optical matrix switches connected in parallel and connected with said 2nd stage optical matrix swtich group, where K=MÃ—N, M and N are integers more than 1; an input-side board containing said 1st stage optical matrix switch group and a part of said 2nd stage optical matrix switch group; and an output-side board containing the other part of said 2nd stage optical matrix switch group and said 3rd stage optical matrix switch group.