Florian Boes

100 Gbit/s wireless link with mm-wave photonics

We demonstrate a single-input single-output photonic wireless link at 237.5 GHz with record 100 Gbit/s data transmission over 20 m. We use an optical heterodyne I/Q transmitter and a state-of-the-art active I/Q-MMIC at the receiver.

Transmission of an 8-PSK modulated 30 Gbit/s signal using an MMIC-based 240 GHz wireless link

The transmission of complex modulated data signals with data rates up to 30 Gbit/s is successfully realized using a 240 GHz wireless link based on active MMIC components. The paper presents the transmission of QPSK and 8-PSK modulated signals over a distance of 40 m as well as a characterization of the RF frontend based on S-parameter measurements and back-to-back signal transmission. The link quality is evaluated in terms of error vector magnitude (EVM) measurement. For a symbol rate of 10 GBd, the EVM measurement shows values of 10.3% and 15.2% for the QPSK and 8-PSK signal, respectively.

Multi-Gigabit Millimeter-Wave Wireless Communication in Realistic Transmission Environments

With the growing interest in millimeter-wave (mmW) communication links, especially for multi-gigabit backhaul applications, detailed studies on the performance limits in terms of achievable transmission distance and data rate, but also, and perhaps even more important, thorough investigations on the influence of different weather conditions gain in importance. In this paper we present a millimeter-wave monolithic integrated circuit (MMIC)-based transmit and receive front-end and ultra-broadband wireless data transmission experiments utilizing a 240 GHz carrier frequency in a long-range outdoor scenario as well as measurements inside a climatic wind tunnel. Data rates up to 64 Gb/s and various complex modulation formats are employed. While in the outdoor transmission, the link is tested in terms of maximum achievable transmission distance and data rate as well as alignment accuracy, in the climatic wind tunnel the influence of rain and fog in the transmission path is investigated in a defined and controlled environment.

Multi-gigabit E-band wireless data transmission

This paper presents the wireless data transmission of complex modulated signals in the E-band using a MMIC-based link compared to the current state of the art in millimeter-wave wireless communication. Highly linear and extremely broadband frontend components in combination with the latest equipment to generate and analyze broadband complex data signals are used in this experiment. The received signal quality is evaluated in terms of EVM and BER. An error free QPSK transmission with a data rate of 40 Gbit/s over a wireless distance of 6m is presented, while the transmission of 80 Gbit/s signals, achieved by 16-QAM modulation, results in a BER of 3.7 × 10-3.

Multi-gigabit data transmission using MMIC-based E-band frontends

In this paper, the transmission of broadband complex modulated signals with data rates up to 48 Gbit=s using an E-band MMIC-based analog frontend is shown. The paper presents the transmission of QPSK, 8-PSK and 16-QAM modulated signals with a symbol rate of 12 GBd. The received signal quality is evaluated in terms of error vector magnitude, which, measured in a coherent setup, shows values of -18.8 dB, -18.7 dB and -20.9 dB for the QPSK, 8-PSK and 16-QAM signal, respectively. Using a more application oriented incoherent setup, the signal quality decreases about 1 dB.

Frequency-multiplexed bias and readout of a 16-pixel superconducting nanowire single-photon detector array

We demonstrate a 16-pixel array of microwave-current driven superconducting nanowire single-photon detectors with an integrated and scalable frequency-division multiplexing architecture, which reduces the required number of bias and readout lines to a single microwave feed line. The electrical behavior of the photon-sensitive nanowires, embedded in a resonant circuit, as well as the optical performance and timing jitter of the single detectors is discussed. Besides the single pixel measurements, we also demonstrate the operation of a 16-pixel array with a temporal, spatial, and photon-number resolution.

MMIC chipset for 300 GHz indoor wireless communication

This contribution presents a full chip set dedicated to high data rate indoor wireless communication at a carrier frequency of 300 GHz. The analog frontend consists of a three-chip solution, namely a transmitter, receiver and local oscillator frequency multiplier. The active millimeter-wave monolithic integrated circuits are realized in a GaAs-based metamorphic high electron mobility transistor technology. The transmitter MMIC achieves a maximum output power of 3.6 dBm and an RF frequency range of 270 to 314 GHz. The receiver MMIC shows 11.4 dB conversion gain without IF amplification in an RF frequency range from 292 to 314 GHz.

Multi-level 20 Gbit/s PSSS transmission using a linearity-limited 240 GHz wireless frontend

In this paper, we investigate the applicability of parallel sequence spread spectrum (PSSS) modulation in high bandwidth millimeter wave communication systems using a 240GHz monolithic microwave integrated circuit (MMIC) based radio frequency (RF) frontend. The transmitter (Tx) and receiver (Rx) are connected directly via an attenuator in an incoherent back-to-back setup using two independent local oscillator (LO) sources. Although the system was restricted to phase modulated signals due to limited linearity when using conventional modulated signals, a transmission using a multivalent PSSS sequence with a spectral efficiency of 1 bit/s/Hz succeeded thanks to the introduced coding gain. The recovered data is evaluated in terms of eye opening and bit error rate (BER). At a gross data rate of 20 Gbit/s, an eye opening of 40% and a BER of 5.4 × 10-5 were observed.

Experimental validation of adverse weather effects on a 240 GHz multi-gigabit wireless link

The influence of hydrometeors on a MMIC-based wireless data transmission at 240GHz carrier frequency was experimentally evaluated in a climatic wind tunnel over a distance of 90 m. Successful transmissions of up to 24 Gbit/s QPSK modulated signals through heavy rain at 43 mm/h and dense fog at 3 g/m3 is achieved. The climatic impact is evaluated in terms of EVM. Reducing the bandwidth makes a transmission still possible with a BER <; 1 × 10-3 under conditions, where a free space optical link would fail.

Wireless THz communications using optoelectronic techniques for signal generation and coherent reception

We show coherent wireless transmission at carrier frequencies of 0.25 THz and 0.35 THz, relying exclusively on optoelectronic concepts for RF signal generation and coherent reception. In a proof-of-concept experiment, we demonstrate transmission of a BPSK signal at a symbol rate of 1 GBd.