Abstract : Due to demand for increased optical transmission capacity, lower cost, and better spectral efficiency, 40 Gb/s optical systems are being deployed and 100 Gb/s transmission is being demonstrated. With increased baud rate, system performance becomes very sensitive to chromatic dispersion, noise, and Polarization Mode Dispersion. It is desirable to have 40 and 100 Gb/s systems that operate as independently of optical physics as is possible. Traditionally, optical dispersion compensation modules were used within line amplifiers to compensate chromatic dispersion. Electrical Domain Compensation of Optical dispersion (eDCO) systems at 10 Gb/s, use digital signal processing to perform dispersion compensation in the transmitter such that all forms of optical compensation are obsolete. Systems at 40 and 100 Gb/s should be designed to be just as independent of dispersion. Telecommunications operators have been discovering significant amounts of Polarization Mode Dispersion in many of their installed fibers. Coherent detection provides several thousand kilometers of reach at 40 Gb/s, and allows linear digital filters in the receiver to combat dispersion, PDL and PMD A 100 Gb/s coherent product operates within a single 50 GHz WDM slot. The same coherent technology can be applied to 200, 400 and 1000 Gb/s modems, with future generations of CMOS.

Biography : Kim Roberts has innovated in the areas of optical transmission and high capacity packet connections since 1984. His creations are at the heart of much of Nortel’s optical transmission portfolio from the first OC-48 to the 100 Gb/s DSP-assisted coherent transceiver. He has been granted 86 US patents while at the Nortel labs in Edmonton, Harlow UK, and Ottawa. Kim holds a BASc and MASc. in Electrical Engineering from UBC and is a Nortel Fellow. Kim received the Outstanding Engineer medal in 2008 from IEEE Canada.

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