Light tranmitting medium

摘要

Non-linear optical characteristics of a carbon nanotube are applied to an optical communication field. An optical transmission medium ( 12 ) obtained by incorporating a carbon nanotube having optically non-linear characteristics into a non-linear light transmitting medium is assembled between typical optical transmission medium ( 14 a , 14 b) and is used by being combined with an optical circulator ( 16 ), whereby the resultant product is used as an optical fuse (breaker) that transmits a normal signal light A but blocks the transmission of an abnormal-intensity light inadvertently produced.