10×10 Gbs directly modulated DFB laser array based on the REC technique.

Abstract

We proposed and experimentally demonstrated a directly modulated distributed feedback (DFB) laser array with a transmission rate of 100Gbps (10c h a n n e l s×10G b p s). The grating design is based on the reconstruction equivalent chirp (REC) technique, which enables precise control of the channel wavelength spacing to 100GHz, as specified in the ITU-DWDM standard. DFB laser arrays incorporating the REC technique demonstrate excellent consistency performance, with a side-mode suppression ratio exceeding 48dB, threshold current of approximately 20mA, and modulation bandwidth of greater than 13GHz at a bias current of 100mA. We evaluated the laser's performance by loading a 10Gbps nonreturn-to-zero signal onto the laser using direct modulation and transmitting it over a 10km single-mode fiber. Based on our experimental results, the proposed DFB laser array is promising to be utilized in the next generation of low-cost, 100Gbps DWDM communication systems.