Optical amplifying device

An optical amplifying device for amplifying an input optical signal, said device comprising:

• light-emitting means for transmitting said input optical signal and emitting, based on said optical signal transmitted by said light-emitting means, a dummy optical signal having a waveform obtained by inverting a waveform of said input optical signal and having a wavelength that is different from a wavelength of said input optical signal;
• control means for controlling the wavelength of said dummy optical signal emitted from said light-emitting means;
• amplifying means for amplifying said optical signal and said dummy optical signal transmitted from said light-emitting means;
• and
• separating means for separating said input optical signal from an optical signal after amplification.

An optical transmission system for amplifying and transmitting an input optical signal, said system comprising:

• light-emitting means for transmitting said input optical signal, and emitting, based on said transmitted input optical signal, a dummy optical signal having a waveform obtained by inverting a waveform of said input optical signal and having a wavelength that is different from a wavelength of said input optical signal;
• control means for controlling the waveform of said dummy optical signal emitted by said light-emitting means;
• first amplifying means for amplifying an optical signal from said light-emitting means;
• first separating means for collectively separating said input optical signal and said dummy optical signal from an optical signal after amplification by said first amplifying means;
• second amplifying means for amplifying an optical signal composed of said input optical signal and said dummy optical signal collectively separated by said first separating means;
• and
• second separating means for separating at least said input optical signal from an optical signal after amplification by said second amplifying means.

An optical amplifying method for amplifying an input optical signal, said method comprising the steps of:

• generating a control electrical signal having a waveform obtained by inverting an envelope of said input optical signal;
• outputting, based on said control electrical signal, a dummy optical signal having a wavelength that is different from a wavelength of said input optical signal;
• multiplexing said input optical signal and said dummy optical signal;
• amplifying a multiplexed optical signal;
• and
• separating at least said input optical signal from an optical signal after amplification.

An optical amplifying method for amplifying an input optical signal, said method comprising the steps of:

• transmitting said input optical signal, and emitting, based on said transmitted input optical signal, a dummy optical signal having a waveform obtained by inverting a waveform of said input optical signal and having a wavelength that is different from a wavelength of said input optical signal;
• collectively amplifying said transmitted input optical signal and said emitted dummy optical signal;
• and
• separating said input optical signal from an optical signal after amplification.