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Maximum likelihood sequence estimation for optical complex direct modulation
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DOI：10.1364/OE.25.008730.png)
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Abstract
En 中文
Semiconductor lasers are versatile optical transmitters in nature. Through the direct modulation (DM), the intensity modulation is realized by the linear mapping between the injection current and the light power, while various angle modulations are enabled by the frequency chirp. Limited by the direct detection, DM lasers used to be exploited only as 1-D (intensity or angle) transmitters by suppressing or simply ignoring the other modulation. Nevertheless, through the digital coherent detection, simultaneous intensity and angle modulations (namely, 2-D complex DM, CDM) can be realized by a single laser diode. The crucial technique of CDM is the joint demodulation of intensity and differential phase with the maximum likelihood sequence estimation (MLSE), supported by a closed-form discrete signal approximation of frequency chirp to characterize the MLSE transition probability. This paper proposes a statistical method for the transition probability to significantly enhance the accuracy of the chirp model. Using the statistical estimation, we demonstrate the first singlechannel 100-Gb/s PAM-4 transmission over 1600-km fiber with only 10G-class DM lasers. (C) 2017 Optical Society of America
Keywords:
SEMICONDUCTOR-LASERS
DFB LASERS
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