B. Mikkelsen

320-Gb/s single-channel pseudolinear transmission over 200 km of nonzero-dispersion fiber

Single-channel transmission at 320 Gb/s is demonstrated over record length of 200 km of nonzero-dispersion fiber. Typical terrestrial amplifier spacing of 100 km is achieved by using pseudolinear transmission and distributed Raman amplification. Stable semiconductor electroabsorption modulators are used in the transmitter, demultiplexer, and clock recovery, and uncorrelated multiplexing is employed in the OTDM transmitter.

A robust real-time 100G transceiver With soft-decision forward error correction [Invited]

We demonstrate a 120 Gb/s coherent polarization-multiplexed quadrature-phase-shift-keyed transceiver with soft-decision forward-error-correction (SD-FEC) coding based on Turbo Product Code. This industry-first transceiver module utilizes a 40 nm complementary metal-oxide semiconductor (CMOS) application-specific integrated circuit with integrated analog-to-digital conversion, digital signal processing and SD-FEC, and is packaged according to a multi-source agreement from the Optical Internetworking Forum. Through several long-haul and ultra-long-haul system experiments (over 1000 km to 3760 km), we validate the robustness of the transceiver and demonstrate its high tolerance to various system impairments, including fiber nonlinearity, chromatic dispersion up to 60,000 ps/nm, polarization mode dispersion, polarization-dependent loss, polarization transients and multiple-path interference.

High spectral efficiency (0.53 bit/s/Hz) WDM transmission of 160 Gb/s per wavelength over 400 km of fiber

A spectral efficiency of 0.53 b/s/Hz is demonstrated at 160 Gb/s over 400 km. The pseudo-linear transmission regime with 100% post compensation is used, and the transmission loss through the 100 km spans is compensated with distributed Raman amplification only.

320 Gbit/s single-channel pseudo-linear transmission over 200 km of nonzero-dispersion fiber

Single-channel transmission at 320 Gbit/s is demonstrated over record length of 200 km (2/spl times/100 km) of nonzero-dispersion fiber. Semiconductor based transmitter, demultiplexer and clock recovery is employed as well as uncorrelated multiplexing in the transmitter.

1.6 Tbit/s (40/spl times/42.7 Gbit/s) transmission over 3600 km UltraWave/spl trade/ fiber with all-Raman amplified 100 km terrestrial spans using ETDM transmitter and receiver

We demonstrate error free transmission of 40/spl times/40 Gbit/s over a record distance of 36/spl times/100 km UltraWave/spl trade/ dispersion managed fiber with all-Raman amplification and 100 GHz channel spacing. CS-RZ modulation and 43 Gbit/s ETDM transmitter and receiver are used.

Real-time DSP for 100+ Gb/s

We discuss the commercial context and technical requirements to 100G coherent interfaces and illustrate ASIC design decisions and challenges, looking beyond 100G as well.

20 Gbit/s all-optical regeneration and wavelength conversion using SOA based interferometers

A novel optical translator that can perform 3R-regeneration and wavelength conversion of high-speed return-to-zero signals is demonstrated at 20 Gbit/s. Efficient retiming and bit-error-rate performance is measured using a Mach-Zehnder interferometer with integrated semiconductor optical amplifiers.

40 Gbit/s upgrades on existing 10 Gbit/s transport infrastructure

Increasing the data rates by a factor of four has historically reduced the cost for the transmission of a unit bandwidth by approximately 40%. As the next natural increase in data rate, 40 Gb/s has been the focus of extensively investigation in research and development labs around the world for several years. However, despite the obvious potentials, 40 Gb/s systems have not yet been commercially deployed, in part because 40 Gb/s is associated with a number of misconceptions, e.g., that 40 Gb/s technology is not mature and that the transmission distance is severely limited by fiber dispersion. In this paper we address the practical requirements that 40 Gb/s systems must meet to become commercially deployed. We show that seamless migration of a 10 Gb/s system to 40 Gb/s per channel is possible with correctly designed line cards. Moreover, we discuss the technologies needed to implement different modulation formats, and the corresponding trade-off between complexity/cost of line cards and the achievable fiber transmission distance.

3760km, 100G SSMF transmission over commercial terrestrial DWDM ROADM systems using SD-FEC

We report error-free, 47×80km transmission of a real-time, 120Gbps, coherent PM-QPSK MSA transceiver with soft-decision forward-error-correction. Two cascaded commercial systems included 40G neighbors and ten ROADMs. The transceiver compensated 60,000ps/nm and had 2.5dB remaining margin.

Opto-electronic and all-optical wavelength translators and their cascadability

We demonstrate superior cascadability performance of bit-rate transparent all-optical interferometric wavelength translators compared to optoelectronic translators. For a translator bandwidth of /spl sim/2 times the bit rate, 9 optoelectronic and 75 all-optical translators can be cascaded.