Abstract: An optical amplifier includes a first path and a second path, and an amplification unit that is arranged on one of the first path and the second path. The amplifier includes a first switch that is arranged on an input stage of the amplification unit, and that switches a third path that connects between the first path and the amplification unit or a fourth path that connects between the second path and the amplification unit. The amplifier includes a second switch that is arranged on an output stage of the amplification unit and that switches a fifth path that connects between the first path and the amplification unit or a sixth path that connects between the second path and the amplification unit. The first switch switches the third path over to the fourth path, and the second switch switches the fifth path to the sixth path.

Abstract: A processing device has a memory including a plurality of storage areas each storing a setting value and the correction frequency change unit. The correction frequency change unit is configured to decrease, when a frequency of correction by the error correction unit for a storage area that stores one of the setting values is changed to a high frequency, a frequency of correction by the error correction processing for one of the storage areas other than the storage area whose correction frequency is changed to a high frequency, and to increase, when a frequency of correction by the error correction unit for a storage area that stores one of the setting values is changed to a low frequency, a frequency of correction by the error correction processing for one of the storage areas other than the storage area whose correction frequency is changed to a low frequency.

Abstract: A processing device has a memory including a plurality of storage areas each storing a setting value and the correction frequency change unit. The correction frequency change unit is configured to decrease, when a frequency of correction by the error correction unit for a storage area that stores one of the setting values is changed to a high frequency, a frequency of correction by the error correction processing for one of the storage areas other than the storage area whose correction frequency is changed to a high frequency, and to increase, when a frequency of correction by the error correction unit for a storage area that stores one of the setting values is changed to a low frequency, a frequency of correction by the error correction processing for one of the storage areas other than the storage area whose correction frequency is changed to a low frequency.