10 January 2018 High-speed optical transmission system using 1.55-μm directly modulated lasers
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Abstract
We present the small-signal frequency responses of single-mode fiber used in directly modulated laser/direct detection (DML/DD) and externally modulated transmitter/direct detection (EXT/DD) systems, and compare the dispersion tolerance of these two systems. We find out that DML/DD system could be more tolerant to fiber chromatic dispersion than EXT/DD system when an electrical equalizer is employed at the receiver. We also present the transmission of 56- Gb/s 4-level pulse amplitude modulation signals generated from a 1.55-μm DML over 20-km standard single-mode fiber with the aid of a linear electrical equalizer. The performance behavior of this system with respect to the transmission distance is explained by using the frequency response.
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Hoon Kim, Hoon Kim, } "High-speed optical transmission system using 1.55-μm directly modulated lasers", Proc. SPIE 10617, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 1061707 (10 January 2018); doi: 10.1117/12.2295011; https://doi.org/10.1117/12.2295011
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