Philippe Jennevé

Single Carrier 168-Gb/s Line-Rate PAM Direct Detection Transmission Using High-Speed Selector Power DAC for Optical Interconnects

We demonstrate the generation and detection of single-polarization 56-GBd PAM-8 and PAM-4 signals using intensity modulation and direct detection leveraging a novel high-speed high-output swing selector power DAC fabricated in an InP DHBT which does not require an external driver. Considering 7% overhead hard-decision forward error control, we validate our design by transmitting the 150 Gb/s net data rate signal based on PAM-8 over 2 km and 100 Gb/s signal based on PAM-4 over 4 km of standard single mode fiber without optical amplification. We complement the results by taking advantage of the high bandwidth of the selector power DAC to increase the PAM-4 symbol rate to 64 GBd and we compare it with the results at 56 GBd at constant information rate. We use the concept of mutual information to assess which Baud rate can achieve best sensitivity as a function of transmission distance.

Monolithic integrated silicon-based slot-blocker for packet-switched networks

We demonstrate a 16-channel, silicon-on-insulator, monolithic integrated slot-blocker. This silicon photonic circuit includes two arrayed waveguide gratings, 16 variable optical attenuators and two vertical fiber couplers. We successfully operate it with 56 Gb/s and 80 Gb/s QPSK optical packets.

Optical slot switching-based datacenters with elastic burst-mode coherent transponders

In a novel concept for intra-datacenter networks, we combine optical slot switching and elastic, burst-mode transponders, with variable bit-rate from 100 to 250 Gb/s depending on node count. Our scenario requires ~x400 fewer transponders than todays 10 Gb/s electronic networks.

Transmission of single-carrier Nyquist-shaped 1-Tb/s line-rate signal over 3,000 km

We synthesize a single-carrier optical signal at a record 1-Tb/s line-rate, out of multiple spectral slices by joint optical and digital signal processing. The 127.9-GBd signal is successfully transmitted and detected after 3,000km distance.

Compact InP-Based DFB-EAM Enabling PAM-4 112 Gb/s Transmission Over 2 km

We demonstrate a 56-GBd pulse-amplitude modulation-4 compact InP transmitter module integrating a distributed feedback laser and an electro-absorption modulator, which exhibits 50-GHz bandwidth, >13-dB extinction ratio and up to 1.5-mW output power. Successful amplifier-free 112-Gb/s transmission is performed over 2 km using low complexity three-taps equalization. We also study the tradeoff between receiver bandwidth, equalizer length and performance, and show successful signal recovery with bandwidths as low as 18 GHz when increasing the equalizer length.

Direct detection transceiver at 150-Gbit/s net data rate using PAM 8 for optical interconnects

We demonstrate a single-polarization driver-free, direct-detection 56-GBaud PAM-8 transceiver enabled by a high-speed selector power DAC fabricated in InP DHBT, and successfully transmit 168 Gbit/s line-rate over 2 km distance without optical amplification.

A Next-Generation Optical Packet-Switching Node Based on Hybrid III-V/Silicon Optical Gates

We report a hybrid silicon optical gate array based on a silicon waveguide with a III-V gain medium and two vertical grating couplers. The gates show a fast switching time, a high extinction ratio, and a positive fiber-to-fiber optical gain. The dynamic behavior of such a device is evaluated under electrically controlled gating. We further focus on a single gate performance in a packet-switched network. We demonstrate subwavelength switching operations with multiformat and multibit-rate optical packet based on direct and coherent detection.

Green optical slot switching torus for mega-datacenters

We propose a torus topology to interconnect Optical Slot Switching rings using elastic-rate transponders. Power consumption in mega-datacenters can be reduced by more than 3x and interfaces and cables by more than 500x when compared with the traditional Ethernet architecture.

Real-time demonstration of software-defined Elastic interface for flexgrid networks

We demonstrate a real-time Elastic Interface for future flex-grid networks with a software-defined symbol rate transmission. Using PDM-QPSK modulation, live experiments show a line rate adaptation from 10.7 to 107Gbit/s with a sub-millisecond reconfiguration time.

Hybrid III-V/Silicon SOA in Optical Network Based on Advanced Modulation Formats

A hybrid III-V/silicon semiconductor optical amplifier (SOA) is presented, which shows a maximum fiber-to-fiber gain of 10 dB and a maximum internal gain around 28 ± 2 dB. The device was fabricated from III-V material wafer-bonded onto a silicon-on-insulator wafer. The optical mode transfers between silicon and III-V waveguides by means of waveguide tapers. Vertical grating couplers are used to connect the SOA to optical fibers. The device was packaged and tested in a transmission experiment. In a loop configuration containing 25 km of single-mode fiber, the SOA amplifies data signals of various modulation formats. Transmission with a bit error rate below the forward error correction limit is demonstrated for up to ten loops using QPSK, six loop using 8QAM, and four loops using 16QAM.