Apparatus and adding and dropping method

1. An apparatus that adds and drops wavelength division multiplexed signal, the apparatus comprising:

a memory configured to store a first correspondence table indicating relationship with between an optical circuit type information and a first output level target value for a dropping circuit; and

a processor configured to determine an output level target value for the dropping circuit for each signal wavelength, based on the first correspondence table and optical circuit type information of each signal wavelength.

2. The apparatus according to claim 1 , wherein

the memory stores a second correspondence table indicating relationship with between the optical circuit type information and a second output level target value for an adding circuit, and

the processor determines an output level target value for the adding circuit for each signal wavelength, based on the second correspondence table and the optical circuit type information of each signal wavelength.

3. The apparatus according to claim 1 , wherein the processor acquires optical circuit type information of the signal wavelength when the signal wavelength is added.

4. The apparatus according to claim 3 , further comprising

a transceiver configured to transmit to a first transmission device the acquired optical circuit type information.

5. The apparatus according to claim 1 , further comprising:

a transceiver configured to:

receive from a second transmission device the optical circuit type information, and

transmit to a first transmission device the received optical circuit type information.

6. The apparatus according to claim 1 , wherein

the memory stores a third correspondence table indicating relationship with between the optical circuit type information and a third output level target value for a pre-optical amplifier, and

the processor determines an average output level target value for the pre-optical amplifier based on the third correspondence table, and optical circuit type information of each signal wavelength.

7. The apparatus according to claim 6 , wherein

the memory stores a fourth correspondence table indicating relationship with between an optical circuit type information and a third output level target value for a post-optical amplifier, and

the processor determines an average output level target value for the post-optical amplifier based on the third correspondence table, and optical circuit type information of each signal wavelength.

8. The apparatus according to claim 7 , wherein

the output level target values for the dropping unit, the adding unit, the pre-optical amplifier, and the post-optical amplifier are set to values proportional to intensity change rates of optical circuits when an optical signal wavelength is added.

9. The apparatus according to claim 8 , wherein

gain target values for the pre-optical amplifier and the post-optical amplifier are determined from an input power measurement value, wavelength number information, and the average output level target values.

10. An apparatus that adds and drops wavelength division multiplexed signal, the apparatus comprising:

a memory configured to store a first correspondence table indicating relationship with between an optical circuit type information and a first output level target value for an adding circuit; and

a processor configured to determine an output level target value for the adding circuit for each signal wavelength, based on the first correspondence table and optical circuit type information of each signal wavelength.

11. An adding and dropping method for wavelength division multiplexed signal, the method comprising:

storing a first correspondence table indicating relationship with between an optical circuit type information and a first output level target value for a dropping circuit; and

determining an output level target value for the dropping circuit for each signal wavelength, based on the first correspondence table and optical circuit type information of each signal wavelength.

12. The adding and dropping method according to claim 11 , further comprising:

storing a second correspondence table indicating relationship with between the optical circuit type information and a second output level target value for an adding circuit, and

determining an output level target value for the adding circuit for each signal wavelength, based on the first correspondence table and optical circuit type information of each signal wavelength.