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Agrate Brianza, Italy

Katopodis V.,National Technical University of Athens | Felipe D.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | Tsokos C.,National Technical University of Athens | Groumas P.,National Technical University of Athens | And 9 more authors.
IEEE Photonics Technology Letters | Year: 2016

We propose a novel multi-flow transmitter concept capable of controlling the number, type, wavelength, and destination of the generated optical flows depending on the client traffic. The concept is based on the selection of the number of optical carriers per flow and the selection between single- and dual-polarization flows. We demonstrate the proof-of-concept combining two commercial In-Phase/Quadrature (IQ) modulators with two prototype polymer circuits, which integrate three tunable lasers for flexible wavelength allocation, four thermo-optic switches for flexible optical routing on-chip, and elements for polarization handling on-chip. We incorporate this transmitter inside an optical node, and we investigate one-flow scenarios with dual-carrier or dual-polarization quadrature phase shift keying (QPSK) modulation, and two-flow scenarios based on two independent QPSK signals. The transmitter and node configuration are controlled by a software-defined optics platform. We demonstrate dynamic operation at 28 GBd and error-free coherent transmission over 100 km of the standard single-mode fiber. © 1989-2012 IEEE.

Dong Y.,Technical University of Denmark | Johansen T.K.,Technical University of Denmark | Zhurbenko V.,Technical University of Denmark | Beretta A.,Linkra Srl | And 2 more authors.
SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Proceedings | Year: 2015

This paper presents a three-dimensional (3D) hybrid integration methodology for terabit transceivers. The simulation methodology for multi-conductor structures are explained. The effect of ground vias on the RF circuitry and the preferred interposer substrate material for large bandwidth 3D hybrid integration are described. An equivalent circuit model of the via-throughs connecting the RF circuitry to the modulator is proposed and its lumped element parameters are extracted. Wire bonding transitions between the driving and RF circuitry were designed and simulated. An optimized 3D interposer design demonstrated a simulated -3 dB transmission bandwidth up to 95 GHz with associated return loss better than 10 dB. A thermal analysis of a subassembly for the packaged transmitter module is performed. A maximum temperature of 74 °C is predicted when copper-tungsten is used as the material of the sub-mount and heat sink layer. © 2015 IEEE.

Groumas P.,National Technical University of Athens | Katopodis V.,National Technical University of Athens | Choi J.H.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | Bach H.-G.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | And 17 more authors.
Journal of Lightwave Technology | Year: 2015

We demonstrate a 2 × 100 Gb/s transmitter and a 4 ×100 Gb/s receiver as the key components for multi-100-GbE and 400-GbE optical interfaces in future intradata center networks. Compared to other approaches, the two devices can provide significant advantages in terms of number of components, simplicity, footprint, and cost, as they are capable of serial operation with nonreturn-to-zero on-off keying format directly at 100 Gb/s. The transmitter is based on the monolithic integration of a multimode interference coupler with two Mach-Zehnder modulators on an electro-optic polymer chip, and the hybrid integration of this chip with an InP laser diode and two multiplexing and driving circuits. The receiver on the other hand is based on the hybrid integration of a quad array of InP photodiodes with two demultiplexing circuits. Combining the two devices, we evaluate their transmission performance over standard single-mode fibers without dispersion compensation and achieve a BER of 10-10 after 1000 m and a BER below 10-8 after 1625 m at 2 ×80 Gb/s, as well as a BER below 10-7 after 1000 m at 2 ×100 Gb/s. Future plans including the development of tunable 100 GbE interfaces for optical circuit-switched domains inside data center networks are also discussed. © 2014 IEEE.

Groumas P.,National Technical University of Athens | Zhang Z.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | Katopodis V.,National Technical University of Athens | Konczykowska A.,III V Laboratory | And 18 more authors.
Journal of Lightwave Technology | Year: 2016

We introduce a hybrid integration platform based on the combination of passive and electro-optic polymers. We analyze the optical and physical compatibility of these materials and describe the advantages that our hybrid platform is expected to have for the development of transmitters in terms of operation flexibility and speed. We combine our platform with InP electronics and develop a transmitter with 22-nm tunability in the C-band and potential for serial non-return-to-zero on-off-keying operation directly at 100 Gb/s. We investigate its transmission performance at 80 and 100 Gb/s using dispersion uncompensated standard single-mode fiber and demonstrate bit-error rate (BER) lower than 10-10 at 80 Gb/s after 1625 m, lower than 10-10 at 100 Gb/s after 500 m, lower than 10-9 at 100 Gb/s after 1000 m, and BER 10-7 at the same rate after 1625 m. We also employ the transmitter inside an experimental setup, which aims to emulate an optical circuit switched (OCS) domain of an intradata center network, and demonstrate at 100 Gb/s the way, in which its wavelength tunability can resolve contentions and improve the flexibility and the efficiency of the network. Finally, we outline our next plans, including the development of flexible and ultra-fast transmitters for coherent systems using the same polymer-to-polymer integration platform. © 1983-2012 IEEE.

Katopodis V.,National Technical University of Athens | Zhang Z.,Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut | Groumas P.,National Technical University of Athens | Konczykowska A.,Alcatel - Lucent | And 16 more authors.
Optical Fiber Communication Conference, OFC 2015 | Year: 2015

We introduce a platform based on passive and electro-optic polymers, and present a serial 100G transmitter with 22-nm tunability. We achieve 100-Gb/s transmission over 1625-m, and demonstrate the flexibility of the transmitter inside data-center networks. © OSA 2015.

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