Optical remodulator that remodulates modulated optical signal and optical remodulation method

An optical remodulator that remodulates an input optical signal modulated by a first data signal and a second data signal to generate an output optical signal, a symbol rate of the second data signal being different from a symbol rate of the first data signal, the optical remodulator comprising:

• a detector configured to optical-to-electrical convert the input optical signal or the output optical signal or both of the optical signals into an electric signal;
• a drive signal generator configured to generate a drive signal based on the electric signal;
• and
• a modulator configured to remodulate the input optical signal with the drive signal, so as to generate the output optical signal, wherein
• the drive signal generator generates the drive signal based on the electric signal, such that the second data signal is deleted from the output optical signal, or such that the second data signal is rewritten with a third data signal in the output optical signal.

An optical remodulation method comprising:

• optical-to-electrical converting an input optical signal or an output optical signal of a polarization diversity modulator, or both of the optical signals, so as to generate an electric signal, the polarization diversity modulator including a first optical modulator implemented for a first polarization state and a second optical modulator implemented for a second polarization state that is orthogonal to the first polarization state;
• generating, according to the electric signal, a first drive signal that drives the first optical modulator and a second drive signal that drives the second optical modulator;
• and
• generating the output optical signal according to the first drive signal and the second drive signal by using the first optical modulator and the second optical modulator.

An optical remodulation method for remodulating an input optical signal modulated by a first data signal and a second data signal to generate an output optical signal, a symbol rate of the second data signal is different from a symbol rate of the first data signal, the optical remodulation method comprising:

• optical-to-electrical converting the input optical signal or the output optical signal or both of the optical signals so as to generate an electric signal;
• generating a drive signal based on the electric signal, such that the second data signal is deleted from the output optical signal, or such that the second data signal is rewritten with a third data signal in the output optical signal;
• and
• remodulating the input optical signal with the drive signal to generate the output optical signal.