Christian Rasmussen

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.

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.

World's first 40 Gbps overlay on a field-deployed, 10 Gbps, mixed-fiber, 1200 km, ultra long-haul system

MCI, Ciena, and Mintera successfully demonstrated the capability of overlaying a production quality 40 Gbps CS-RZ optical signal on a Ciena-designed 1200 km ultra long-haul (ULH) system over an MCI multi-span, mixed-field fiber route from Sacramento to Salt Lake City.

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.

Demonstration of 1000km 43Gb/s RZ-DPSK Transmission through a 50GHz Channel Spaced WSS

We demonstrate bandwidth-limited 1000 km transmission of 43 Gb/s RZ-DPSK signals. System bandwidth was limited via a MEMS-based wavelength-selective switch operating at 50 GHz channel spacing. The system demonstrates increased tolerance to bandwidth limitation, noise and non- linearity.