Optical connection module for endoscope, endoscope, and endoscope system

An endoscope comprising:

• an optical connection module comprising:
• an optical fiber having a fiber end surface and configured to guide a part of emitted light emitted from a light source and incident on the fiber end surface;
• a ferrule having a ferrule end surface with an opening of a through-hole into which the optical fiber is inserted, the ferrule including a scatterer configured to scatter, in an inside of the ferrule, a part of the emitted light incident on the ferrule end surface, the ferrule being configured to emit scattered light generated by scattering from a side surface;
• and
• an optical sensor arranged in a periphery of the side surface of the ferrule and configured to receive the scattered light;
• wherein the ferrule is configured such that a light quantity of the scattered light emitted from a rear end surface on an opposite side of the ferrule end surface is greater than 0.1% and less than 80% of a light quantity of the emitted light incident perpendicularly on the ferrule end surface.

An endoscope system comprising:

• a light source device including an optical connection module, and
• an endoscope configured to emit illumination light guided by the light source device,
• wherein the optical connection module comprising:
• an optical fiber having a fiber end surface and configured to guide a part of emitted light emitted from a light source and incident on the fiber end surface;
• a ferrule having a ferrule end surface with an opening of a through-hole into which the optical fiber is inserted, the ferrule including a scatterer configured to scatter, in an inside of the ferrule, a part of the emitted light incident on the ferrule end surface, the ferrule being configured to emit scattered light generated by scattering from a side surface;
• and
• an optical sensor arranged in a periphery of the side surface of the ferrule and configured to receive the scattered light;
• wherein the ferrule is configured such that a light quantity of the scattered light emitted from a rear end surface on an opposite side of the ferrule end surface is greater than 0.1% and less than 80% of a light quantity of the emitted light incident perpendicularly on the ferrule end surface.