Abstract
THz communications systems at carrier frequencies above 200 GHz are the key to enable next-generation mobile communication networks with 100 Gbit/s wireless data rates. One of the key questions is, which carrier frequency generation technique will be the most suitable. This is currently addressed by two separate approaches, electronics-based and photonics-based. We present in this paper a truly microwave photonic approach that benefits from the main key features of each, bandwidth, tunability, stability and fiber compatibility from photonics and power handling capability from the electronics. It is based on a Photonic Local Oscillator (PLO), generating a 100 GHz frequency, fed into an electronic frequency multiplier. A high speed uni-travelling carrier photodiode (UTC-PD) provides the 100 GHz PLO for Schottky tripler diodes, generating 300 GHz signal. To feed the UTC-PD, we present a photonic integrated mode locked laser source. According to the simulations and measurements, the developed transmitter can produce a maximum of 12 μW of THz power at 280 GHz.
Highlights
The development of Beyond 5G next-generation mobile communication networks is addressing the bandwidth challenge, leaping from the 20 MHz available within the frequency range between800 MHz and 2.6 GHz, and beyond the current 5 GHz available at different millimeter-wave bands between 71 GHz to 95 GHz [1]
To validate the RF coupling technique and measure the local oscillator (LO) power available at the input of tripler diodes, we integrated the uni-travelling carrier photodiode (UTC-PD) with a planar antenna, with coplanar pads at the input, that radiates in the E-band (71–86 GHz)
To validate the RF coupling technique and measure the LO power available at the input of tripler(a) diodes, we integrated the UTC-PD with a planar (b) antenna, with coplanar pads at the input, Antenna that radiates in the E-band (71–86 GHz)
Summary
The development of Beyond 5G next-generation mobile communication networks is addressing the bandwidth challenge, leaping from the 20 MHz available within the frequency range between. THz communication systems are capable of delivering high-rate data over wireless links, but due to the intrinsic high propagation loss at higher carrier frequencies and the low power generated at these frequencies by photonic sources, the transmission distances achieved so far are typically in the range of about 10 m at 409 GHz [9], and. This approach follows the classical solid-state electronic devices used during the last two decades to up-convert the signal provided by the available stable solid-state sources in microwave frequency range by multiplier chains, formed with cascaded Schottky doublers and/or triplers These multipliers have been showing power handling capability, delivering 20 mW output power at 193 GHz with an efficiency of nearly 8% [11]. To yield more than 1 mW at 300 GHz only when both were close to device destruction [12]
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