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A 7.5-ns time constant is observed in thermal frequency modulation of a DFB laser. Such a fast thermal effect should be taken into consideration for directly modulated and coherently detected optical communication systems.
We demonstrate the first complex modulation and detection of PAM-4 and PAM-8 using a directly modulated laser with frequency chirp. Through coherent detection and differential phase assisted Viterbi decoding, PAM-4 system shows >9-dB OSNR sensitivity advantage over the intensity-only decision.
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