What is Optical Transimpedance Amplifier-Function,operation

This page describes Optical Transimpedance Amplifier basic operation. It mentions function and applications of transimpedance amplifier in optical domain.

The transimpedance amplifier is made of photodiode and operational amplifier as shown in the figure below. The main job of transimpedance amplifier is to convert current (produced by photodiode) into differential voltage. One end of photodiode is connected with ground and the other end is kept at potential equal to virtual ground due to minus input of amplifier. We will understand the operation or working of this optical transimpedance amplifier.

Optical Transimpedance Amplifier

• When light falls on the photodiode, it generates current equivalent to light input.

• The transimpedance amplifier will cause generated current to pass through feedback resistor. This results into generation of voltage at the amplifier output. The equation is , V = i*Rf

• As value of Rf is already known, current can be estimated with better accuracy.

Following are the features of Transimpedance Amplifier:
• High input current
• Low Power dissipation
• Low input noise current(referred one)

Applications of Optical Transimpedance Amplifier

Following are the applications of Optical Transimpedance Amplifier:
• Used in various fiber channel configurations such as 1X, 2X, 4X, 8X etc.
• Used in 10 gigabit ethernet
• Used in SONET and SDH
• Used in 10GBase-LX4

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