Quantum Key Distribution (QKD) enables future-proof long-term protection of sensitive data and communication applications – even against the imminent security threats of quantum computers. Fraunhofer HHI developed a high-speed QKD system that seamlessly integrates in telecom network infrastructures.

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Fraunhofer HHI's Single Photon Detection Module offers an efficient, compact, and cost-effective solution for precise single photon detection in the optical C-band and O-band. Ideal for quantum communication, it features state-of-the-art detection efficiency and low dark count rates.

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A versatile measurement device for digitizing events in time domain with a resolution down to 0.1 nanoseconds

Fraunhofer HHI’s Timetagger is a versatile measurement device with multiple input channels allowing digitizing the time of events with a resolution of 100 ps. Switching threshold and hysteresis could be set for any input channel. The digitized events could be read by a network interface.

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High‑Speed Test & Measurement Equipment Beyond Conventional C/L-Band Systems

Fraunhofer HHI offers high-speed test and measurement equipment for the O-band, exceeding conventional C/L-band systems. This includes a Dual Polarization IQ Optical Transmitter for generating high-speed data signals and a Dual Polarization Coherent Receiver Frontend for precise coherent detection in the O-band. This is complemented by an automatic Optical Loop Control for emulating long transmission distances in the O-band. Solutions are also available for other wavelength ranges from O- to U-band. Together with our partner ID Photonics, we offer high-performance optical test and measurement devices such as DP IQ reference transmitters up to 80 GHz and coherent reference receivers with bandwidths up to 60 GHz.

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Flexible and Efficient Lab Power Management

Fraunhofer HHI introduces the Modular Multi Source power supply, designed to streamline lab setups by consolidating multiple power sources into a single, compact unit. With up to 12 channels per slot across 8 slots, it offers customizable current and voltage outputs, laser drivers, and TEC controllers. This modular system enhances precision and reduces clutter, making it ideal for various research fields, including electronics, photonics, and semiconductor development. Ethernet connectivity and a small form factor ensure versatile, efficient lab operations.

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Utilizing cascaded analog multiplexing

This prototype of a high-speed Digital-to-Analog Converter (DAC) utilizes our cascaded analog multiplexing (AMUX) technology and an FPGA driver to provide a cost-efficient solution for broadband signal generation with possible real-time capability.

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Optical Wireless Communication Systems

Fraunhofer HHI engages in the development of the next generation of optical wireless communication systems. LiFi 2.0 combines high-power wide-beam laser transmitters with array receivers to reach wide field-of-view and electronic tracking for up to 4 mobile devices at high data rates up to 10 Gbit/s.

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Speed-up your digital coherent system designs

The VPItoolkit^TM DSP Library is a comprehensive collection of lab-proven digital signal processing algorithms designed for the modeling and simulation of high-performance optical transmission systems. The new release features novel equalizers for space-division multiplexing systems.

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Hybrid integration and micro-optical bench

The PolyBoard wafer technology with its active/passive hybrid integration and micro-optical bench enables the implementation of photonic integrated circuits for quantum technologies, e.g. QKDs transmitters for polarization encoding and photon pair sources featuring on-PIC nonlinear crystals.

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Mode-Locked and External-Cavity Lasers

Fraunhofer HHI’s SiN wafer line enables for the hybrid integration of SiN PICs with active InP components for mode-locked lasers with a tailored repetition rate and external cavity tunable lasers operating at NIR wavelengths.

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Application-specific PICs from NIR down to VIS

Fraunhofer HHI offers SiN PICs that can be customized for different applications and wavelength ranges. Photonic building blocks including ring resonators, MMIs, tunable gratings and phase shifters are available. Optimized interfaces allow for the hybrid integration of lasers, gain chips and detectors. Furthermore, surface functionalization together with wafer-level micro-fluidics enables the use of the SiN wafer technology in life sciences, analytics and sensing.

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Tunable, narrow-linewidth mmWave to sub-THz signal generation

Fraunhofer HHI’s hybrid integration technology presents a photonic integrated circuit for generation of Hz-level mmWave signals, from 30 to 105 GHz and beyond. The combination of InP active components, polymer waveguides and micro-optical bench functionality realizes the optical injection-locking technique on a hybrid PIC and results in a compact and scalable photonic solution for next-generation wireless networks.

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A compact RF PIC assembly for fast and convenient prototype development up to 40 GHz

Have you designed an InP PIC on our MPW run and don’t have access to electrical and optical PIC probing equipment? RFconnect allows you to interface your PIC with up to 10 optical fibers, 42 DC and 8 RF ports and TEC for thermal management for your experiments. The generic assembly service is an add-on to Fraunhofer HHI’s field-proven InP foundry services.

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Single Photon Detection for Quantum Communication and Sensing

Fraunhofer HHI provides photodetector modules for single photon detection operating, from the O- to the L-band. The SPAD chips inside the modules are based on mature InP technology and are fabricated in the wafer process line of Fraunhofer HHI, with Telcordia and space-qualified processes. The SPAD supply chain is completely within EU, including packaging at the Fraunhofer HHI facility.

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TFLN PICs for Communication and Sensing

Fraunhofer HHI offers high-speed phase modulation for 100+ GHz Mach-Zehnder modulators on TFLN PICs. The broad optical spectrum from 450 - 4500 nm allows for a wide range of applications in sensing, communication and quantum. First building blocks for customized wafer fabrication are available and regular TFLN MPW runs are coming soon.

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High-Performance MLL Modules for 25/50/100 GHz Operation

Fraunhofer HHI’s compact c-band mode-locked laser (MLL) modules are available in two-section (TS) and colliding pulse (CP) designs. They feature InGaAsP MQW buried-heterostructure chips with integrated gain and saturable absorber sections. With >13 dBm fiber-coupled output power, these modules offer a powerful, reliable solution for next-generation photonics.

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PolyPhotonics Berlin e.V. is an association for the promotion of science and research in the field of hybrid photonic integration platforms. The association organizes joint research projects, public events, and trade fairs.

PolyPhotonics Berlin e.V. offers profound expertise in the field of new materials, micro-optical elements, photonic integration and automated assembly technologies for optical components for applications in telecommunications/datacom, analytics, sensor technology and quantum communication.

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Partners of PolyPhotonics Berlin e.V.

"High Symbol-Rate Transceivers - how to get to the pinnacle of performance?"
Jonathan Andree
September 28, 2025, 2 p.m., Room 3

"Will photonics-enabled THz communication and sensing play a role in 6G?"
Robert Elschner
September 28, 2025, 2 p.m., Room B4 M5-8

"In-Building Networks: Ways to lower energy and cost per bit."
Volker Jungnickel
September 28, 2025, 4 p.m., Room B3 M5-M8

"LLM Assistant for TAPI Context and Client Code Translation"
Aydin Jafari
September 29, 2025, 3:30 p.m., Auditorium 10

"11.5 Gbit/s Transmission Using a 660 mW LiFi Transmitter"
Malte Hinrichs
September 30, 9:00 a.m., Room B5 M1-4

"Dynamic Rerouting of Quantum Key Distribution Links During Live Operation for Software-Defined Networks"
Jan Krause
September 30, 2025, 4:30 p.m., Room B5 M1-4

"Hybrid Photonic Integrated Circuit for Tunable, Narrow-Linewidth mmWave to sub-THz Signal Generation"
Tianwen Qian
October 1, 2025, 11 a.m., Hall E

"Single-Photon Avalanche Diode with kHz Dark Count Rates at Room Temperature for O-Band QKD"
Elisa Collin
October 1, 2025, 11 a.m., Hall E

"Utilizing Degeneracy in a Few-Mode Fiber to Demonstrate Entanglement Distribution"
Tasbiha Rafiq
October 1, 2025, 11 a.m., Auditoria 10+11+12

"2 Tb/s/λ 3-mode Transmission over 54-km Few-Mode Fiber with Blind Equalization Enabled by Digital Subcarrier Multiplexing"
Aymeric Arnould
October 01, 2025, 11 a.m., Auditoria 10+11+12

"Qubit-Based Clock Drift Correction for Resource-Efficient Quantum Key Distribution"
Stephanie Renneke
October 1, 2025, 11 a.m., Auditoria 10+11+12

"Short Range Optical Wireless Communication at 67.8\,Gbit/s using a Multiaperture VCSEL"
Matthias Koepp
October 1, 2025, 4 p.m., Room B4 M5-8

"Leveraging Shared Data and Models for ML-Based QoT Estimation: Toward Standardized and Generalizable Models"
Hassan Akbari
October 1, 2025, 4:30 p.m., Auditorium 10

"InP-Based Polarization Independent LAN WDM Photodetector PIC"
Alexander Schindler
October 1, 2025, 4:45 p.m., Auditorium 11

"Leveraging a Commercial Source for Metropolitan-scale Entanglement-based Quantum Key Distribution"
Tomi Getselev
October 1, 2025, 4:45 p.m., Auditorium 12

"Spatially Resolved Fiber Link Monitoring Based on Receiver DSP Data"
Johannes Fischer
October 2, 2025, 10 a.m., Room B3 M1-4

"Partitioned MIMO Equalization with Mode-Group Specific Interface Resolution for SDM Transmission over 58.9 km 15-mode Fiber"
Nicolas Braig-Christophersen
October 02, 2025, 11 a.m., B3 M1-4