OPTICAL TRANSMISSION DEVICE AND OPTICAL TRANSMISSION METHOD

摘要

PROBLEM TO BE SOLVED: To allow an optical transmission operation to continue even at a high temperature exceeding the specification temperature of a light emitting element.SOLUTION: An optical transmission device 100 has: an optical transmitter 101 which includes a light emitting element 102 and a light emitting element drive circuit 104; a temperature sensor 141 which detects the temperature of the optical transmitter 101; and a control part 150 which, when the temperature detected by the temperature sensor 141 is the specification temperature of the light emitting element 102 or higher, switches an operational mode of the optical transmitter 101 from a normal mode to a low power mode and reduces thermal effect on the light emitting element 102 to continue the operation of the light emitting element 102. The control part 150 executes the following controls in combination: lowering transmission speed of a transmission interface circuit 130 and a light emitting element drive circuit 104 at the time of low power mode; stopping a band expansion operation of the light emitting element drive circuit 104; lowering power of the light emitting element 102; and reducing the number of transmission channels of the transmission interface circuit 130 and the light emitting element drive circuit 104.