9 May 2014

COBRA COLLOQUIUM: Friday May 9, 2014 at 15:00 – 16:00 in the Film Theater of Grand Café and Film house De Zwarte Doos

Speaker: Prof. Dan M. Marom

Title: Switching technologies for spatially and spectrally flexible optical networks

Abstract: The recent introduction of space-division multiplexing (SDM) to the optical communication domain necessitates complementary components for realizing optical communication networks in support of SDM. SDM is typically realized with either multi-core or few-mode fibers and great capacity achievements have been demonstrated in each fiber solution. Optical switching functionality for these two fiber types has recently been introduced in support of each of these fiber types. A joint-switching WSS concept has been realized for multi-core fibers, enabling information to be encoded and routed on the fiber network as a spatial super-channel (single wavelength channel spanning multiple cores). A single WSS can then be used in analogous fashion to the single-mode fiber networks, thereby heralding the cost-savings benefits of SDM. A WSS with direct few-mode fiber interfaces has been demonstrated with the few-mode beams routed in free-space just as the single mode Gaussian beam does in a conventional WSS. A study on the pass band filtering effect and mode mixing due to the switching of dispersed components revealed the spatial-spectral interplay in the mode-dependent loss attributes of the few-mode fiber WSS. Such advanced WSS prototypes will serve the next generation transport networks when SDM is fully adopted by carriers.

Biography: Dan M. Marom is an Associate Professor in the Applied Physics Department at Hebrew University, Israel, heading the Photonic Devices Group. He received the B.Sc. Degree in Mechanical Engineering and the M.Sc. Degree in Electrical Engineering, both from Tel-Aviv University, Israel, in 1989 and 1995, respectively, and was awarded a Ph.D. in Electrical Engineering from the University of California, San Diego (UCSD), in 2000.
His 20 year research career in optical communications started during his Master’s degree, where he investigated polarization rotation based bypass-exchange switches, which later on led to the founding of the company Civcom. In his doctoral dissertation he investigated real-time optical signal processing using optical nonlinearities with applications in ultrafast communications. From 2000 until 2005, he was a Member of the Technical Staff at the Advanced Photonics Research Department at Bell Laboratories, Lucent Technologies, where he worked on novel MEMS based switching solutions for optical communications. Since 2005, he has been with the Applied Physics Department, Hebrew University, Israel, where he is now an Associate Professor leading a research group pursuing his research interests in creating photonic devices for switching and manipulating optical signals, using light modulating devices, nonlinear optics, and compound materials.
Prof. Marom is a senior member of the IEEE Photonics Society, and a member of the Optical Society of America. From 1996 through 2000, he was a Fannie and John Hertz Foundation Graduate Fellow at UCSD, and was a Peter Brojde Scholar in 2006-2007. He currently serves as Senior Editor for Photonics Technology Letters, handling photonic devices related submissions.

After the colloquium (around 16:00) we organize a mini-colloquium in which three COBRA researchers, one from each of the three COBRA groups, will give a short presentation about his or her work.

For the Electro Optical Communication Group:
Speaker: Vincent Sleiffer Title: Long-haul Mode-Division Multiplexed Transmission of 3 Modes × 128-Gb/s DP-QPSK
For the Photonic Integration Group:
Speaker: Giovanni Gilardi Title: RF Crosstalk in InP-based Photonic Integrated Circuits
For the Photonics and Semiconductor Nanophysics Group:
Speaker: Rosalinda Gaudio Title: The role of inhomogeneities in nanowire superconducting single-photon detectors

The audience is invited to an informal gathering following the colloquium (around 17:00) in the lounge of Grand Café and Film house De Zwarte Doos.