Nowadays it is impossible to imagine contemporary society without optics/photonics technologies for transmission and processing of huge volumes of information content. Exponentially growing data transport and storage put challenging demands for communication system. Recent advances in laser technology, novel materials, and methods of signal processing have allowed increasing the optical communication capacity in several orders of magnitude.
The Kista High Speed Transmission Lab (HST-Lab) is a research unit for advanced experimentation on systems and components for high speed optical communication, and is jointly operated by Royal Institute of Technology (KTH) and RISE Acreo AB. Kista HST-Lab has excellent facilities for experiments on advanced optical transmission systems to meet real life engineering design criteria for most demanding industry applications. Researchers under joint Kista HST-Lab have been continuously working with ultrahigh-speed optical communications in both direct detection and coherent systems, and advanced digital/photonic-assisted signal processing.
Breakthrough results have been presented in top-level journals and conferences: Nature-Light, Nature-Scientific Reposts, ECOC, CLEO, ACP, and others.
Prof. G. Jabobsen, Dr. R. Schatz, Dr. O. Ozolins, Dr. X. Pang, Dr. A. Udalcovs, Dr. A. Kakkar, Dr. J.-R. Navarro
Main research topics:
- Mitigation of semiconductor laser phase/frequency noise and equalization enhanced phase noise (EEPN) in coherent fiber optic transmission systems. Latest results published in Scientific Reports (Nature).
- High-speed intensity modulation and direct detection system demonstration with higher than 100 Gbps on-off keying (OOK) and 4/8 pulse amplitude modulation (PAM) with ultra-broadband distributed feedback externally modulated laser (DFB-EAM) having 100 GHz 3-dB bandwidth with 2 dB ripple.
- Researchers from the Kista HST-Lab has contributed to:
- Record high-speed THz photonic-wireless transmission demonstration with up to 300 Gbps data rate. Results published in IEEE Photonics Conference post-deadline session.
- Real time 100 Gbaud three level duobinary signaling with InP-based integrated externally modulated laser (EML) for optical interconnect applications. Results published in ECOC2016 post-deadline session.
Collaboration under joint the Kista HST-Lab within several European/National level projects have resulted in more than 10 highly educated PhDs and Postdocs. Kista HST-Lab supports and encourages independent research initiatives leading to technology transfer to active industry players and allows to create innovative products.
Equipment and expertise:
The laboratory is fully equipped for advanced high speed transmission system experiments, including the following systems:
- analog signal generator up to 67 GHz
- 56 Gbaud bit pattern generator
- digital to analog converter up to 40 GHz
- several units of 100 GHz DFB-EAM and a unit of 100 GHz photodetector
- two units of 50 GSa/s arbitrary waveform generators (AWD)
- broadband quadrature amplitude modulation transmitter module up to 400 Gbit/s
- broadband optical IQ-modulators
- 44 GHz coherent receiver
- digital storage oscilloscope up to 80 GSa/s and 33 GHz analog bandwidth
- high power external cavity lasers
- optical fiber links with optical amplifiers (Raman, EDFA)
- optical and electrical spectrum analyzers
- a fully developed lab automation routine based on MATLAB for efficient optimization and measurements.
With this equipment, advanced end-to-end system experiments can be performed:
- Serial binary electrical data generation as well as optical intensity modulation and direct detection up to 116 Gbit/s (58 Gbaud 4 PAM, 35 Gbaud 8 PAM and high bitrate DMT)
- Coherent signal transmission in dual polarizations using multilevel modulation formats (56 Gbaud QPSK, 32/64 Gbaud square 16/64-QAM, circular 16/64-QAM and beyond) as well as OFDM
- Analysis of algorithms for signal impairment mitigation and detection using digital/photonic assisted signal processing
- Very high speed optical transmission and photonic/polymer components at 400 Gbit/s on a single wavelength
- Optical communication with advanced modulation formats, 2008-2012, Knut and Alice Wallenberg Foundation
- Griffon (Green Initiative for Future Optical Networks), 2013-2016, EU Marie Curie program
- ICONE (Allied Initiative for Training and Education in Coherent Optical Networks), 2014-2017, EU Marie Curie program
- Photonic assisted signal processing”, 2017-2020, Swedish Research Council