Patent ID: 8200090

Claim:
An optical transmission apparatus, comprising: a rough adjustment execution portion that monitors a bit error rate of an optical signal for respective set values of a dispersion compensator where the set values have been set less closely to each other within a dispersion compensation control range than when a wavelength dispersion value set in the dispersion compensator is determined, and carries out a rough adjustment to determine a comparison threshold value used to set the wavelength dispersion value of the dispersion compensator based on the monitored bit error rate; and a fine adjustment execution portion that monitors the bit error rate for the respective set values of the dispersion compensator where the set values have been set more closely to each other than the set values for the rough adjustment execution portion, using the minimum value of the bit error rates acquired by the rough adjustment execution portion as a starting point, compares the monitored bit error rate with the comparison threshold value determined by the rough adjustment execution portion, acquires two bit error rates which first exceed the comparison threshold value, and carries out a fine adjustment to determine a wavelength dispersion value corresponding to the midpoint between the two acquired bit error rates as the wavelength dispersion value of the dispersion compensator.