Experimental demonstration of λ/8 DFB semiconductor laser array for 1.3 μm CWDM system

In this article, we report the first experimental demonstration of an eight-wavelength λ/8 phased-shifted laser array based on the REC technique in the 1.3 μm wavelength domain. Measurement results exhibit good linearity of lasing wavelength with +/−0.35 nm wavelength residual. The SLM property was ensured with SMSRs all larger than 38 dB. Moreover, the direct-modulation performance was also tested. The experimental results show that the modulation bandwidth can reach up to 13 GHz even at the small injection current of 40 mA and the measured spurious-free dynamic range (SFDR) is up to 87 dB/Hz2/3, which shows good linearity. These measurements show that REC-based λ/8 phased-shifted laser array has good modulation performance and it may find potential application in actual fiber-optic systems.