An optical amplifier comprising: an input port for receiving an input optical signal; a wavelength division multiplexer having a first input coupled to the input port, a second input coupled to a pump source, and an output coupled to an amplification fiber, a first integrated component positioned between the input port and the wavelength division multiplexer, the first integrated component configured to provide input monitoring and isolation wherein the first integrated component is configured to: separate a first portion of the input optical signal received from the first port, direct the first portion to a first photo detector and, direct a second portion of the input optical signal to an output coupled to the wavelength division multiplexer, and wherein the first integrated component is configured to attenuate light signals received from the wavelength division multiplexer, and a second integrated component configured to provide output monitoring and isolation, wherein the second integrated component is configured to: separate a first portion of a light signal received from the amplification fiber, direct the first portion to a second photo detector, and direct a second portion of the input light from the amplification fiber to an output port, and wherein the second integrated component is configured to attenuate light signals received from the output port, and characterized in that the first and the second integrated components each comprising a tube holding an input and output fiber (302, 304), followed along an optical path by birefringent crystal, followed by a half wave plate, followed by a lens, a polarization rotator followed by a prism, followed by a photo detector (318, and the prism comprises a first end surface facing the polarization rotator and a second end surface facing photo detector, wherein the first end surface comprises a partial reflective coating, wherein the second end surface has a high reflection for wavelengths corresponding to a pump source and low or no reflection for wavelengths of the optical signal. an input port for receiving an input optical signal; a wavelength division multiplexer having a first input coupled to the input port, a second input coupled to a pump source, and an output coupled to an amplification fiber, a first integrated component positioned between the input port and the wavelength division multiplexer, the first integrated component configured to provide input monitoring and isolation wherein the first integrated component is configured to: separate a first portion of the input optical signal received from the first port, direct the first portion to a first photo detector and, direct a second portion of the input optical signal to an output coupled to the wavelength division multiplexer, and wherein the first integrated component is configured to attenuate light signals received from the wavelength division multiplexer, and a second integrated component configured to provide output monitoring and isolation, wherein the second integrated component is configured to: separate a first portion of a light signal received from the amplification fiber, direct the first portion to a second photo detector, and direct a second portion of the input light from the amplification fiber to an output port, and wherein the second integrated component is configured to attenuate light signals received from the output port, and characterized in that the first and the second integrated components each comprising a tube holding an input and output fiber (302, 304), followed along an optical path by birefringent crystal, followed by a half wave plate, followed by a lens, a polarization rotator followed by a prism, followed by a photo detector (318, and the prism comprises a first end surface facing the polarization rotator and a second end surface facing photo detector, wherein the first end surface comprises a partial reflective coating, wherein the second end surface has a high reflection for wavelengths corresponding to a pump source and low or no reflection for wavelengths of the optical signal.