Patent ID: 7444083

Claim:
An optical signal transmission system comprising: a refractive-index profile optical fiber in which a core diameter, of a core outputting an optical signal incident from a first end, that is received from a second end, is not lower than 200 μm; a vertical cavity surface emitting laser diode which is arranged at the second end of the optical fiber, the vertical cavity surface emitting laser including a constriction layer of electric current, the constriction layer including an oxidized aperture with a diameter equal to or smaller than 11 μm, the vertical cavity surface emitting laser diode having a plurality of light-emission points, outputting light beams toward an end face of the optical fiber, the vertical cavity surface emitting laser diode outputting the light beams having substantially a same wavelength as a wavelength in which transmission loss of the optical fiber becomes smaller from the light-emission points; and a light receiving element which is arranged at the first end of the optical fiber, the light receiving element receiving the light signal outputted from the end face of the optical fiber, wherein the vertical cavity surface emitting laser diode includes a plurality of light emission points in which light beams are emitted simultaneously and a divergent angle of the emitted light beams is equal to or smaller than 23 degrees.