2017/05/15 by Cheng-Ting Tsai, C.S. Tsai, Chun‐Yen Peng +25 · 1 citation
Engineering · #Bit error rate #Channel (broadcasting) #Chip #Computer science #Decoding methods #Electronic engineering #Engineering #Laser #Materials science #Optical Network Technologies #Optics #Optoelectronics #Orthogonal frequency-division multiplexing #Photonic and Optical Devices #Physics #QAM #Quadrature amplitude modulation #Semiconductor Lasers and Optical Devices #Telecommunications #Transmission (telecommunications) #Vertical-cavity surface-emitting laser
paper · doi:10.1109/jqe.2017.2703645
openalex publication_date 2017/05/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
An 850-nm multi-mode vertical cavity surface emitting laser (VCSEL) bare chip with high-indium-density InGaAs/AlGaAs quantum-well pairs is demonstrated for directly encoded QAM-OFDM transmission in multi-mode fiber (MMF). By directly encoding the 850-nm VCSEL bare chip with a pre-leveled 14-GHz 16-QAM OFDM data, >50-Gb/s transmission over 100-m-long OM4 MMF can be realized without using data recovery circuit. Increasing the bias current of the VCSEL beyond 7.5Ithimproves the signal-to-noise ratio (SNR) and the bit error ratio (BER) of received QAM-OFDM data to 15.5 dB and2.9× 10-3, respectively. The 100-m-long OM4 MMF transmission degrades the SNR with its covered bandwidth reducing to 13 GHz. The OFDM subcarrier pre-leveling technique with a slope of 0.2 dB/GHz ensures the 16-QAM-OFDM data transmission with an error vector magnitude of 17.1% and a BER of3.4× 10-3.