Greg Raybon

40-Gb/s return-to-zero alternate-mark-inversion (RZ-AMI) transmission over 2000 km

We report on the transmission of 40-Gb/s alternate-mark-inversion return-to-zero (RZ-AMI) signals over more than 2000 km (20 /spl times/ 100 km) of nonzero dispersion fiber at a bit-error ratio of 10/sup -9/. The RZ-AMI signal is generated using a single, nonreturn-to-zero-driven modulator in combination with an optical delay interferometer. This transmitter allowed for a 40-Gb/s record receiver sensitivity of 78 photons/bit.

A 107-Gbit/s Optoelectronic Receiver Utilizing Hybrid Integration of a Photodetector and Electronic Demultiplexer

A novel 107-Gbit/s optoelectronic receiver has been designed using hybrid integration of a photodiode and electronic demultiplexer. Using an ETDM transmitter, we achieve the lowest reported required OSNR for 107-Gbit/s CSRZ-OOK, 21 dB for 10-3 BER and a 231-1pattern length. Design methodology and performance data are presented.

100G Ethernet A Review of Serial Transport Options

We review recently demonstrated options for serial transport technologies at 100 Gb/s, including binary, multi-level, and coherently detected polarization-multiplexed formats.

100-Gb/s discrete-multitone transmission over 80-km SSMF using single-sideband modulation with novel interference-cancellation scheme

We present a novel scheme to cancel signal-signal beat interference in direct-detection systems with single-sideband modulation. We use this scheme to successfully transmit 80-Gb/s SSB-DMT at 1550 nm over 80-km SSMF with margin.

A multirate upgradable 1.6-Tb/s hierarchical OADM network

We report a hierarchical optical add-drop multiplexer (OADM) network that supports 10-, 40-, and 160-Gb/s data rates with the same bandwidth efficiency. The data rates can be upgraded without hardware modification in the OADM. This hierarchical OADM network is equipped with high capacity (1.6 Tb/s) for traffic growth, while providing different granularities for diverse bandwidth requirements as fine as 12.5 GHz in optical domain. We investigate the transmission penalty through the waveband OADMs, and compare the performance between all-through traffic and add-drop traffic of neighboring wavebands at 40-Gb/s rate.

All-Electronic 100-GHz Bandwidth Digital-to-Analog Converter Generating PAM Signals up to 190 GBaud

We demonstrate an all-electronic digital-to-analog converter (DAC) with 100-GHz electrical bandwidth, sampling at 240 GSa/s, based on digital band interleaving (DBI). We discuss digital predistortion techniques for compensating the nonideal performance of the high-speed and radio-frequency components in our DBI architecture. We then test the DAC by generating up to 190-GBaud Nyquist-shaped pulse amplitude modulation. We analyze the performance of the digital band interleaved DAC and demonstrate coherent detection of single-polarization optical binary phase-shift keying at 140 GBaud.

Quasi-Real-Time Optical Sampling Scheme for High-Speed Signal Acquisition and Processing

We present a quasi-real-time coherent sampling approach that combines the high-bandwidth and high-fidelity signal acquisition of equivalent-time optical sampling with real-time digital signal processing and equalization algorithms. The quasi-real-time concept enables feasibility studies of optical communication at symbol rates beyond the bandwidth of conventional digitizer approaches. Here we demonstrate the technique using a 107-GBd polarization-division-multiplexed quadrature phase shift keyed signal.

Experimental demonstration of a fiber-based optical 2R regenerator in front of an 80Gbit/s receiver

We demonstrate, for the first time to our knowledge, an 80 Gbit/s optical 2R regenerator based on self phase modulation in fiber. The potential improvement in receiver sensitivity and tolerance to degraded optical signal-to-noise ratio is investigated.

40-Gb/s RZ transmission over 1200 km using an integrated electroabsorption-modulated laser

We report single-channel 40-Gb/s signal transmission over nonzero dispersion-shifted fiber using an integrated electroabsorption-modulated laser in the transmitter for data modulation. Return-to-zero format pseudolinear transmission over 1200 km is achieved with a measured Q of 15.6 dB or bit-error rate of 10/sup -9/.

40-Gb/s RZ signal transmission in a transparent network based on wavelength-selective optical cross connect

We investigate 40-Gb/s return-to-zero signal transmission in a transparent optical network equipped with wavelength-selective optical cross connects (WSOXCs). The investigation is performed in a recirculating loop setup consisting of 4100-km spans of transmission fiber. A WSOXC is placed inside the loop to mimic cascaded WSOXCs with a spacing of 400 km. We study various degradation effects in the system, particularly those of node loss and optical filtering. Q value measurements of the received signal were carried out at different transmission distances and WSOXC loss conditions. A Q value of 15.5 dB was measured at 1200-km distance with two cascaded WSOXCs of which the node loss is 17 dB.