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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

Fiber Optic Network and Optical Components Related Links

DWDM system basics   Fibre optic communication   What is PDMA?   What is WDM?  SONET SDH tutorial   SDH Networks   SDH Frame structure   SDH Modulation   PDH Frame structure   Optical Components  Optical Isolator   Optical Circulator   Optical Amplifier   Optical Filter   Optical Coupler   Optical MUX DEMUX   Optical Equalizer   Optical Switch   Wavelength converter  

What is Difference between

PDH vs SDH  SONET versus SDH   CAS vs CCS  Types of WDM   Single vs multimode fiber  

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