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High speed multi-level amplitude (e.g. 56GBaud PAM4) and complex (64QAM) modulated optical signals impose increased linearity requirements to the electro-optic devices made of linear amplifiers and optical transmitters and receivers.
Designers and manufacturers of optical transmitters and receivers characterize the compression level of amplifiers and electro-optical converters, so the performance of electro-optic RF chain or subsystems can be determined and optimized. Gain compression (AM-AM) and phase compression (AM-PM), over a device specified frequency range, are measured during development, and often tested in manufacturing.
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