As an electro-optic device, Fiber Optical Receiver receives optical signals from an optical fiber then converts them into electrical signals. It is composed of an optical detector, a low-noise amplifier, and other circuitry. The type of other circuitry contained within the receiver is determined by what type of modulation is used and the receiver electrical output requirements. Firstly, the optical detector converts the incoming optical signal into an electrical signal. Secondly, the low-noise amplifier amplifies the electrical signal to a level suitable for further signal processing. Finally, the other circuitry produce the output electrical signal. Fiber Optic Receiver is designed for many different packages such as Hermetic Kovar, Rack mount, outdoor enclosures and so on.