Abstract: An optical isolator module in which an optical splitter for splitting an optical signal input through an input port, an optical detector for detecting the separated light, and a compensator for compensating for polarization mode dispersion are integrated into a single component along with an isolator, and an optical amplifier employing the optical isolator module are disclosed. In the optical isolator module, a first lens focuses the incident optical signal. A first birefringent device has a tapered shape in which a first incident surface forms a first predetermined angle with a first emitting surface from which a polarized light is emitted, and the incident surface of the first birefringent device is coated for partial reflection so that the portion of the incident optical signal is reflected as an reflected light. A Faraday rotator rotates polarized light by a second predetermined angle.

Abstract: A multi-stage combined optical device having an improved structure which can detect incident light power using a single optical isolator.