Focused Session on mm-Wave and THz Photonics

Tuesday, 14:30 – 17:10 in the Room “Tiger & Turtle”

14:30    Photonics-Assisted Integrated Devices Enabling Ultra-Wideband Terahertz Systems

Shuya Iwamatsu1, José Luis Fernández Estévez1, Marcel Grzeslo1,2, Muhsin Ali3, Guillermo Carpintero3,4, Andreas Stöhr1,2

1 University of Duisburg-Essen, Department of Optoelectronics (OE) | Germany
2 Microwave Photonics GmbH | Germany
3 LeapWave Technologies | Spain
4 University Carlos III of Madrid | Spain

Emerging terahertz (THz) silicon microphotonics is promising due to its potential towards the development of ultra-wideband THz systems on chip. Here, we present recent technologies for ultra-wideband THz integrated circuits enabled by interconnecting between InP-based uni-traveling-carrier photodiode source and Si-based dielectric rod waveguide.

14:50    Optoelectronic Terahertz Receiver based on the Hybrid Integration of Schottky Diodes and UTC Photodiodes in a Rectangular Waveguide Block

Iñigo Belio-Apaolaza1, Himanshu Gohil1,2, Hui Wang2, James Seddon1, Peter G. Huggard2, Cyril C. Renaud1

1 University College London | United Kingdom
2 RAL Space | United Kingdom

Optoelectronic terahertz receivers have the potential of incorporating photonic solutions for local oscillator provision. However, these are typically based on photoconductors with poor conversion efficiency. Here, we present the design of a 300 GHz mixer based on the hybrid integration of InGaAs Schottky diodes and uni travelling carrier photodiodes in the same rectangular waveguide block. This solution combines the efficient down-conversion of Schottky technology and the benefits of photonic local oscillators. 

15:10    Low Power Consumption and Low Phase Noise Broadband DC-40 GHz RFoF Links for Antenna Remoting

Yilmaz Ucar1,2, Vitaly Rymanov2, Sumer Makhlouf1,2, Andreas Stöhr1,2

1 University of Duisburg-Essen, Department of Optoelectronics (OE) | Germany
2 Microwave Photonics GmbH | Germany

Replacing metallic cables by active radio frequency over fiber (RFoF) links is beneficial for various applications including satellite communications, 6G backhaul, antenna remoting or test & measurement. This is because RFoF provides low-loss and ultra-broadband connectivity. Besides low weight optical fibers, another important requirement of RFoF links for space-born applications, is the overall power consumption of a link. In this work we report on low-power consumption RFoF Tx/Rx modules using advanced 1.3µm optical modulators and photoreceivers. Using the fabricated modules, we achieved low power consumption (<1W/link), lossless (>0dB link gain), and broadband (DC-40 GHz) RFoF links.

15:50    Ten Times Lower Power Requirement Sub-Millimeter Wave Receivers Operating at Room Temperatures

Javier Martinez Gil, Diego Moro Melgar, Oleg Cojocari, Ion Oprea

ACST GmbH | Germany

In this work we report the development and demonstration at ACST of an experimental sub-harmonic full-band WR 3.4 mixer, featuring discrete InGaAs low barrier Schottky diodes. This mixer sets the ground basis at ACST for the development of THz room temperature receivers up to 1.1 THz with 10 times lower local oscillator (LO) power requirement. The mixer presents typical DSB Noise Temperatures of 9000 K varying from 7000 to 10000 K withing the 220-330 GHz radio frequency (RF) band. The reduction in local oscillator input power requirements is as low as 500 µW for optimal operation conditions. The mixer can still perform good results reducing the LO power to 350 µW. Both, the mixer and the diodes have been fully designed and fabricated at ACST GmbH.

16:10    Planar diffractive optical elements for THz beam polarization control

Surya Revanth Ayyagari1, Simonas Indrišiūnas2, Vytautas Janonis1, Daniil Pashnev1, Justinas Jorudas1, Andreas Kurt Klein-Schuster3, Andreas Stöhr3,4, Guillaume Ducournau5, Irmantas Kašalynas1

1 Terahertz Photonics Laboratory, Center for Physical Sciences and Technology (FTMC) | Lithuania
2 Laser Microfabrication Laboratory, Center for Physical Sciences and Technology (FTMC) | Lithuania
3 University of Duisburg-Essen, Department of Optoelectronics (OE) | Germany
4 Microwave Photonics GmbH | Germany
5 Lille University | France

We proposed the diffractive optical elements (DOEs) based on planar high-resistivity silicon gratings to perform as quarter waveplate (QWP) and half waveplate (HWP) at selected THz frequency range. As proof of principle QWPs were developed for 0.4 THz frequency demonstrating an operational bandwidth of up to 200 GHz. The Finite Difference Time Domain (FDTD) simulations were found in good agreement with THz Time Domain spectroscopy (THz-TDS) and vector network analyzer (VNA) experiments measuring transmission amplitude and phase spectra in the range of 0.1-1.0 THz.

16:30    Polymer-Based Hybrid-Integrated RF Photonics Transmitter for mm-wave/THz Applications

Kalliopi Spanidou1, Tianwen Qian2, Peer Liebermann2, David de Felipe2, Norbert Keil2, Guillermo Carpintero1,3

1 University Carlos III of Madrid | Spain
2 Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute (HHI) | Germany
3 LeapWave Technologies | Spain

Photonic integration plays a key role in revolutionizing and shaping the future of THz communication and sensing applications through high-performance optical sources for photonic-based RF signal generation. However, widely tunable low-phase noise signals remain a challenge, especially when aiming to include the THz range. Hybrid integration, thanks to the integration of different materials with complementary characteristics can offer key advantages over monolithic InP sources to achieve high-performance, extremely wide tuning range and high-spectral signal purity. We report a novel polymer-based hybrid-integrated optical heterodyne signal source including two tunable InP/Polymer distributed Bragg reflector (DBR) laser monolithically with an integrated wavelength-meter based on thin-film filters (TFF) and on-chip photodiodes (PD) for absolute wavelength measurement. Owing to high efficiency of the hybrid platform, wavelength tuning up to 6 nm (~ 0.7 THz) and accurate wavelength monitoring are achieved. This compact optical source aims for reliable, low phase-noise RF signal generation for 5G/6G applications.