Patent ID: 8150258

Claim:
An optical transmission device for controlling an optical signal output and transmitting an optical signal via an optical transmission line having an optical fiber connected by an optical connector, the optical transmission device comprising: an optical detector to detect return light of the optical signal transmitted via the optical transmission line; an optical transmitter to generate superimposed light having a superimposed basic low-frequency wave and transmitting the light when return light is detected by the optical detector; a return light identification section to identify the return light detected by the optical detector as Fresnel light caused by a disconnection of the optical connector or Stokes light caused by stimulated Brillouin scattering based on an analysis result of the return superimposed light with respect to the superimposed light transmitted by the optical transmitter; and a jitter amount acquisition section to multiply a frequency of the return superimposed light with respect to the superimposed light transmitted from the optical transmitter by a frequency of the superimposed basic low-frequency wave, removing a low-frequency band from a frequency band of the multiplied frequency, and acquiring a jitter amount that is a variation in a temporal waveform, wherein the return light identification section identifies the return light detected by the optical detector as the Stokes light when the jitter amount acquired by the jitter amount acquisition section exceeds a threshold, and identifies the return light detected by the optical detector as the Fresnel light when the jitter amount acquired by the jitter amount acquisition section does not exceed the threshold.