Patent ID: 7925171

Claim:
An optical transmission apparatus, which is provided with: a plurality of optical modulating sections that modulates light; a plurality of driving sections that outputs drive signals for driving said optical modulating sections in accordance with modulating signals input thereto; and a delay amount varying section that provides a variable delay amount for at least one modulating signal among the modulating signals respectively input to said plurality of driving sections, to adjust relative timing between the drive signals to be provided respectively for said plurality of optical modulating sections, said apparatus comprising: at least one temperature monitoring section that monitors a temperature of a portion where a delay amount of an optical signal being propagated or an electric signal being propagated is changed depending on the temperature; and a delay amount control section that controls the delay amount in said delay amount varying section based on the temperature monitored by said temperature monitoring section, so that a differential delay between the drive signals to be provided respectively for said plurality of optical modulating sections is held constant irrespective of a temperature variation, and wherein said temperature monitoring section is capable of detecting the temperatures of electronic circuit sections including said plurality of driving sections and said delay amount varying section, and said delay amount control section controls the delay amount in said delay amount varying section based on the temperatures monitored by said temperature monitoring section, to compensate for the delay deviation between the drive signals which occurs according to the temperature variation in the delay amount of the electric signal propagated through each of said electronic circuit sections.