Patent ID: 8098425

Claim:
A fiber amplifier, comprising: at least a pump laser, at least a gain medium, and at least an integrated optical component, wherein the integrated optical component comprises multiple optical input/output ports, and the optical input/output ports are connected to the pump laser or gain medium directly or indirectly; wherein the integrated optical component comprises: an optical input port, comprising: a signal light input port, configured to input optical signals to be amplified; a pump light input port, configured to input pump light; and an active medium output port, configured to input amplified optical signals to the integrated optical component; and an optical output port, comprising: a signal light output port, configured to output amplified optical signals; and an active medium input port, configured to output optical signals to be amplified to a gain medium; wherein the integrated optical component further comprises: an optical splitter port, configured to split the input signal light, and output signal light and/or pump light; a polarization beam combiner port, configured to input combined polarization light signals; an optical detector output port, configured to convert optical signals into electrical signals; and an optical attenuator drive port, configured to drive the optical attenuator.