We fabricated a flip-chip interconnection lumped-electrode EADFB laser module and an optical receiver that includes a broadband electrical amplifier. Both have a 3-dB bandwidth of more than 50 GHz. Under 53.2-Gbaud 4-PAM (107 Gb/s) operation, clear eye openings were obtained without an equalizer even after a 2-km SMF transmission, and we obtained a BER of less than 2 × 10-4under error-free conditions using KP4 FEC without an equalizer also after a 2-km SMF transmission.
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Kanazawa et al. (2016) studied this question.
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