© Ciena Corporation
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Transport technology readiness
Possible technology choices for 100G transmission
Parallel options suitable for 100G on dedicated fiber, limited distances
4 X 25G and 10X10G have been proposed
4x 25G VCSEL WDM likely candidate for client-side optics (achievable with CMOS)
Negative service provider reaction to parallel networking solutions in MAN/WAN
Non-scalability of capacity: multiple waves to manage, ROADM port exhaust
Serial options – new technology to improve propagation, spectral efficiency
Trading speed for complexity – starting at 112 Gb/sec
Polarization multiplexing – divide by 2
Each polarization carries a 56 Gb/s signal
Phase coding – e.g.: Four phase states
Four phases encode two info bits
Symbol rate cut in half to 28 Gbaud/sec
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