Pilot-Tone Assisted 16-QAM Photonic Wireless Bridge Operating At 250 GHz

A photonic wireless bridge operating at a carrier frequency of 250 GHz and transmitting at a data rate of 20 Gbit/s is proposed and demonstrated. To mitigate the phase noise of the free-running lasers present in such a link, the toneassisted carrier recovery is used. Compared to the blind phase noise compensation (PNC) algorithm, this technique exhibited no penalty, and a penalty of less than 0.5 dB, when used with aggregated Lorentzian linewidths of 67 kHz and 350 kHz, respectively. The wireless bridge is also demonstrated in a wavelength division multiplexing (WDM) scenario, where 5 optical channels are generated and sent to the Tx remote antenna unit (RAU). In this configuration, the full band from 224 GHz to 294 GHz is used. Finally, to extend the data rate, two channels are digitally multiplexed at the central office (CO) forming a twin, singlesideband (SSB) signal. With this arrangement a wireless bridge of 40 Gbit/s is realized.

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