Patent ID: 9158104
Filing Date: 2015-10-13
Classification: A61B,G01N,G02B

Abstract:
1. An optical coupler device comprising: a first WDM-type optical coupler having a first port, second port and a fourth port that is positioned as a cross port when regarding said first port as an input end and positioned as a straight port when regarding said second port as an input end; and a second WDM-type optical coupler having a fifth port, sixth port, a seventh port that is positioned as a straight port when regarding said fifth port as an input end and positioned as a cross port when regarding said sixth port as an input end, and an eighth port that is positioned as a cross port when regarding said fifth port as an input end and positioned as a straight port when regarding said sixth port as an input end; said fourth port of said first WDM-type optical coupler and said fifth port of said second WDM-type optical coupler being optically coupled and said second port of said first WDM-type optical coupler and said eighth port of said second WDM-type optical coupler being optically coupled.