Amplitude separation type optical amplification apparatus

An optical amplification apparatus including a polarizing beam splitter for reflecting a portion of an incident light and transmitting a remaining portion of the incident light, depending upon a polarized state of the incident light, the apparatus comprising:

• a first polarizing plate which makes polarized states of the light before and after the light reflected from the polarizing beam splitter reciprocatingly passes through the first polarizing plate, to be orthogonal to each other;
• an amplitude division plate for amplitude-dividing the light having passed through the first polarizing plate, into first and second lights;
• and
• optical amplifiers for respectively amplifying the first and second lights which are amplitude-divided by the amplitude division plate.

An optical amplification apparatus comprising:

• a polarizing beam splitter for reflecting a portion of an incident light and transmitting a remaining portion of the incident light, depending upon a polarized state of the incident light;
• an optical isolator including a first polarizing plate which makes polarized states of the light before and after the light reflected from the polarizing beam splitter reciprocatingly passes through the first polarizing plate, to be orthogonal to each other, and a stimulated brillouin scattering-phase conjugate mirror for reflecting the light having passed through the first polarizing plate;
• and
• at least two optical amplification means each including a second polarizing plate which makes polarized states of the light before and after the light transmitted through the polarizing beam splitter by the first polarizing plate reciprocatingly passes through the second polarizing plate, to be orthogonal to each other, an amplitude division plate for amplitude-dividing the light having passed through the second polarizing plate, into first and second lights, and optical amplifiers including stimulated brillouin scattering-phase conjugate mirrors for respectively amplifying and reflecting the first and second lights which are amplitude-divided by the amplitude division plate,
• wherein the at least two optical amplification means are arranged in the shape of a chain such that the light outputted from upstream optical amplification means is incident upon the polarizing beam splitter included in downstream optical amplification means.