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Optical terabit transmitter and receiver based on passive polymer and InP technology for high-speed optical connectivity between datacenters

: Katopodis, V.; Tsokos, C.; Felipe, D. de; Spyropoulou, M.; Konczykowska, A.; Aimone, A.; Groumas, P.; Dupuy, J.-Y.; Jorge, F.; Mardoyan, H.; Rios-Müller, R.; Renaudier, J.; Jennevé, P.; Boitier, F.; Pagano, A.; Quagliotti, M.; Roccato, D.; Johansen, T.K.; Tienforti, M.; Vannucci, A.; Bach, H.-G.; Keil, N.; Avramopoulos, H.; Kouloumentas, Ch.


Li, G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII : 29-31 January 2018, San Francisco, California, United States
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10561)
ISBN: 978-1-5106-1608-0
ISBN: 978-1-5106-1607-3
Paper 1056107, 15 pp.
Conference "Next-Generation Optical Communication - Components, Sub-Systems, and Systems" <7, 2018, San Francisco/Calif.>
Conference "Optoelectronics, Photonic Materials and Devices Conference" <2018, San Francisco/Calif.>
Photonics West Conference <2018, San Francisco/Calif.>
Conference Paper
Fraunhofer HHI ()

We demonstrate the hybrid integration of a multi-format tunable transmitter and a coherent optical receiver based on optical polymers and InP electronics and photonics for next generation metro and core optical networks. The transmitter comprises an array of two InP Mach-Zehnder modulators (MZMs) with 42 GHz bandwidth and two passive PolyBoards at the back- and front-end of the device. The back-end PolyBoard integrates an InP gain chip, a Bragg grating and a phase section on the polymer substrate capable of 22 nm wavelength tunability inside the C-band and optical waveguides that guide the light to the inputs of the two InP MZMs. The front-end PolyBoard provides the optical waveguides for combing the In-phase and Quadrature-phase modulated signals via an integrated thermo-optic phase shifter for applying the pi/2 phase-shift at the lower arm and a 3-dB optical coupler at the output. Two InP-double heterojunction bipolar transistor (InP-DHBT) 3-bit power digital-to-analog converters (DACs) are hybridly integrated at either side of the MZM array chip in order to drive the IQ transmitter with QPSK, 16-QAM and 64-QAM encoded signals. The coherent receiver is based on the other side on a PolyBoard, which integrates an InP gain chip and a monolithic Bragg grating for the formation of the local oscillator laser, and a monolithic 90° optical hybrid. This PolyBoard is further integrated with a 4-fold InP photodiode array chip with more than 80 GHz bandwidth and two high-speed InP-DHBT transimpedance amplifiers (TIAs) with automatic gain control. The transmitter and the receiver have been experimentally evaluated at 25Gbaud over 100 km for mQAM modulation showing bit-error-rate (BER) performance performance below FEC limit.