CWDM vertical-cavity surface-emitting laser array spanning 140 nm of the C, S, and L fiber transmission bands

We demonstrate record wavelength span from an eight-channel two-dimensional wavelength-division-multiplexed optically pumped vertical-cavity surface-emitting laser array. The array operates continuous wave above 65/spl deg/C and spans 140 nm of the S-, C-, and L-band from 1470 to 1610 nm with 20-nm channel spacing. The devices are fabricated using two separate active regions laterally integrated with fully oxidized distributed Bragg reflectors using nonplanar wafer bonding. We achieved single transverse-mode operation with greater than 36-dB sidemode suppression ratios and less than 2-dB output power variation across the array.