Light receiving module for SCM transmission

A light-receiving module comprising:

• a pigtail optical fiber including a core portion for transmitting an optical signal and a cladding portion covering a side face of the core portion;
• an optical connector provided at a first end of the pigtail optical fiber for optically connecting a transmitting optical fiber to the first end of the pigtail optical fiber;
• a light-receiving device having a light-receiving face for receiving the optical signal propagating through the core portion and for converting the optical signal into an electric signal;
• an optical coupling system for converging the optical signal emitted from a second end of the pigtail optical fiber onto the light-receiving face of the light-receiving device;
• and
• means for preventing transmission of light from the cladding portion to the light-receiving device so that the optical signal propagating through the core portion does not interfere with light propagating through the cladding portion on the light-receiving face of the light-receiving device, wherein the means for preventing substantially attenuates or eliminates any light propagating through the cladding portion of the pigtail optical fiber in a middle of the pigtail optical fiber.