25 Gb/s Directly Modulated Widely Tunable 1.3 μm Dual Wavelength DFB Laser for THz Communication

We report a high speed directly modulated widely tunable dual wavelength distributed feedback (DFB) laser for THz communication application. The wavelength separation between the two modes can be thermally tuned between 96 GHz and 1510 GHz. The device can be directly modulated by high speed data at up to 25 Gb/s data rate, which facilitates high speed data modulation in a THz communication system. The device emits at $1.3~\mu \text{m}$ wavelength, which helps to increase the transmission distance of high-speed baseband data in fibers and lowers the request for wavelength tuning range to obtain the same THz frequency when compared with $1.5~\mu \text{m}$ wavelength devices. The presented results show that our dual wavelength device is promising for future low cost and high capacity THz communication system.