We report 20 Gb/s transmission of 4-level pulse amplitude modulation (PAM) signal using a directly modulated tunable distributed Bragg reflector (DBR) laser, Transmission distance over 20 km was achieved without using optical amplifiers and optical dispersion compensation modules. A wavelength tuning range of 11.5 nm and the 3-dB bandwidth greater than 10 GHz over the entire wavelength tuning range was obtained.

zhou daibing, Zhao Lingjuan. Transmission of 20-Gbs PAM-4 signal over 20-km optical fiber using a directly modulated tunable DBR laser[J]. Chinese Optics Letters, 2018, 16(9): .  复制并引用该论文