To exploit the extremely wide bandwidth in the THz region for ultra-high-speed wireless communication, UTCPD- based THz emitters enjoy a wide bandwidth and high linearity, but face challenges in increasing power due to saturation effects and thermal effects. We designed a 16-way WR3 power combiner for 12 dB gain using the Y-branch structure in the 300 GHz band. Additionally, a 37.7 dBi gain reflector-integrated diagonal horn antenna was developed for a pencil beam at 300 GHz. Furthermore, ongoing efforts are dedicated to manufacturing them with 3D printing technique.
To realize a high-speed high-reliability wavelength switching at future WDM networks, we proposed the injection current/temperature cooperative control method of the tunable-distributed-feedback (DFB) laser array (TLA) for avoiding a large injection current, which is the primary cause of laser degradation. We successfully demonstrated a full-C-band wavelength switching within 124 ms by rapid increase of the injection current and following gradual decrease of the injection current to avoid laser aging. Compared to the conventional control method, the meantime to failure of the TLA in the proposed method is estimated to be extended by 44 times.
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