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Alternate mark invert (AMI) encoding is shown to overcome the low-frequency nonlinear FM response of DFB lasers. Results from an experimental heterodyne system are presented where the local oscillator (LO) and the signal carrier are at nearly the same frequency. This has the same sensitivity in theory as an ideal single-filter FSK detection system and offers the advantage of a compact optical spectrum when used in FDM systems.
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Steele et al. (1989) studied this question.
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