Transimpedance Amplifier T-type Amplification

This transimpedance amplifier with a T-network feedback configuration converts an input current into an output voltage. It's also a common building block that helps explain the performance and stability limits of many other op-amp circuits. [pdf]

Maximum gain of optical amplifier

An optical amplifier is a device that amplifies an directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a without an, or one in which from the cavity is suppressed. Optical amplifiers are important in and. They are used as in the long distance which carry much of the world'. [pdf]