Optical transmission device that employs vertical cavity surface-emitting laser diode as light source

An optical transmission system comprising:

• an optical transmission device;
• and
• an optical reception device,
• the optical transmission device comprising a single chip light source including light-emitting regions and an optical fiber that transmits lights emitted from the light-emitting regions,
• the light source including a first light-emitting region positioned at a place that corresponds to an optical axis of the optical fiber, and a second light-emitting region positioned at places that surround the first light-emitting region;
• a light emitted from the first light-emitting region entering a first core of a first optical fiber having a first core diameter, in a case where the first optical fiber is connected to the optical transmission device,
• lights emitted from the first and second light-emitting regions entering a second core of a second optical fiber having a second core diameter greater than the first core diameter when the second optical fiber is connected to the optical transmission device;
• and
• an antireflection film provided in an area other than the first core on an incident surface of the first optical fiber,
• the light emitted from the second light-emitting region enters the antireflection film when the first optical fiber is connected to the optical transmission device,
• wherein the first light-emitting region and the second light-emitting region emit lights of an identical wavelength.

An optical transmission device comprising:

• a single chip light source including light-emitting regions;
• and an optical fiber that transmits lights emitted from the light-emitting regions,
• the single chip light source including a first light-emitting region positioned at a place that corresponds to an optical axis of the optical fiber, and a second light-emitting region positioned at places that surround the first light-emitting region;
• a light emitted from the first light-emitting region entering a first core of a first optical fiber having a first core diameter, in a case where the first optical fiber is connected to the optical transmission device,
• lights emitted from the first and second light-emitting regions entering a second core of a second optical fiber having a second core diameter greater than the first core diameter when the second optical fiber is connected to the optical transmission device;
• and
• a drive circuit that stops an emission from the second light-emitting region, when the first optical fiber is connected to the optical transmission device,
• wherein the first light-emitting region and the second light-emitting region emit lights of an identical wavelength.