U. Troppenz, Michael Narodovitch, C. Kottke, G. Przyrembel, W. Molzow, A. Sigmund, H. Bach, M. Moehrle
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1.3 μm Electroabsorption Modulated lasers for PAM4/PAM8 single channel 100 Gb/s
1.3μm Electroabsorption Modulated DFB Lasers (EMLs) operating at 45°C are presented for higher order intensity modulation formats. The application of Pulse Amplitude Modulation (PAM) is experimentally demonstrated for PAM4/PAM8 coding at symbol rates of 28 GBd. With integrated impedance matching the low cost EML shows an increased optical modulation bandwidth of 40 GHz. NRZ eyes at 56 Gb/s have been measured with dynamic extinction ratio of > 9 dB which demonstrates the potential of the devices for PAM at higher symbol rates. The EML performance is discussed for application in single channel solutions of direct detection 100G atacomm systems.
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