Abstract
A photonic wireless bridge operating at a carrier frequency of 250 GHz is proposed and demonstrated. To mitigate the phase noise of the free-running lasers present in such a link, the tone-assisted carrier recovery is used. Compared to the blind phase noise compensation (PNC) algorithm, this technique exhibited penalties of 0.15 dB and 0.46 dB when used with aggregated Lorentzian linewidths of 28 kHz and 359 kHz, respectively, and 20 GBd 16-quadrature amplitude modulation (QAM) signals. 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, a 50 Gbit/s transmission is achieved with the proposed wireless bridge in single channel configuration. The wireless transmission distance is limited to 10 cm due to the low power emitted by the uni-travelling carrier photodiode used in the experiments. However, link budget calculations based on state-of-the-art THz technology show that distances >1000 m can be achieved with this approach.
Highlights
T HE spectrum congestion at radio frequencies (RF) is forcing telecommunication companies to seek a solution at higher frequencies
By adding to this the 252 GHz – 275 GHz frequency range, which is already allocated to fixed services, a continuous bandwidth of 68 GHz is obtained: this is more than 5 times what is currently available in the W and D bands
In this paper we demonstrate a photonic wireless bridge operating at 250 GHz and using a carrier recovery scheme based on the transmission of a reference pilot tone
Summary
T HE spectrum congestion at radio frequencies (RF) is forcing telecommunication companies to seek a solution at higher frequencies. As mentioned in the Ericsson report, the ultimate objective is to support data rates of 100 Gbit/s, which may be difficult with such a limited bandwidth To achieve this capacity in an efficient way, the use of windows beyond 275 GHz will, be required. Assuming required coverage distances of ≥100 m (i.e., transmission limited to individual windows due to high atmospheric attenuation), this scenario calls for high spectral efficiencies (i.e., >2 b/s/Hz) Apart from these requirements, an easy integration of the wireless transmitter with the optical fiber network is an important requirement for wireless bridges.
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