This chapter provides a discussion of signal distortion and highlights some common sources of distortion. A transfer function that might resemble direct laser intensity modulation was used as an example for the origin of distortion in an analog signal. Optical components that have a frequency‐dependent amplitude transfer functions over the range of the RF modulation can therefore disrupt the output signal fidelity. Numerous optical components can exhibit such a response, such as filters and amplifiers that may exhibit significant gain slope or ripple over their bandwidth. An optical amplifier will exhibit a low‐pass filter response to gain modulation with a characteristic cutoff frequency that corresponds to the response time of the medium. Distortion in photodetectors is important for high‐SFDR photonic links. The chapter highlights the importance of high linearity photodetectors in photonic links, especially those that operate at high average photocurrents.
Distortion in Fiber Optic Links
FUNDAMENTALS OF MICROWAVE PHOTONICS ; 124-165
2015-02-26
42 pages
Article/Chapter (Book)
Electronic Resource
English
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