att_abstract={{We discuss the advantages of spatial superchannels for future terabit networks based on space division multiplexing (SDM), and demonstrate reception of spatial superchannels by a coherent receiver utilizing joint digital signal processing (DSP). In a spatial superchannel, the SDM modes at a given wavelength are routed together, allowing simplified design of both transponders and optical routing equipment. For example, common-mode impairments can be exploited to streamline the receiver’s DSP. Our lab measurements reveal that the phase fluctuations between the cores of a multicore fiber are strongly correlated, and therefore constitute such a common-mode impairment.  We have implemented master-slave phase recovery of two simultaneous 112Gbps subchannels in a 7-core fiber, demonstrating reduced processing complexity with no increase in the bit-error ratio. Furthermore, we have investigated the feasibility of applying this technique to subchannels carried on separate single-mode fibers, a potential transition strategy to evolve today’s fiber networks toward future networks using multicore fibers.}},
	att_authors={mf2182, ln4395, xz8628, sw1213, ri6543},
	att_copyright_notice={{This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published in 2012. {{, Volume 24}}{{, Issue 21}}{{, 2012-11-01}}
	att_tags={Optical transmission, space-division multiplexing, coherent communications},
	author={Mark Feuer and Lynn Nelson and Xiang Zhou and Sheryl Woodward and Rejoy Isaac and Benyuan Zhu and Thierry F. Taunay and Michael Fishteyn and John F. Fini and Man F. Yan},
	institution={{IEEE Photonics Technology Letters}},
	title={{Joint Digital Signal Processing Receivers for Spatial Superchannels}},