@article {8490,
	title = {Variable optical attenuator and dynamic mode group equalizer for few mode fibers},
	journal = {Optics Express},
	volume = {22},
	number = {25},
	year = {2014},
	pages = {30520-30527},
	abstract = {Variable optical attenuation (VOA) for three-mode fiber is experimentally presented, utilizing an amplitude spatial light modulator (SLM), achieving up to -28dB uniform attenuation for all modes. Using the ability to spatially vary the attenuation distribution with the SLM, we also achieve up to 10dB differential attenuation between the fiber{\textquoteright}s two supported mode group (LP01 and LP11). The spatially selective attenuation serves as the basis of a dynamic mode-group equalizer (DME), potentially gain-balancing mode dependent optical amplification. We extend the experimental three mode DME functionality with a performance analysis of a fiber supporting 6 spatial modes in four mode groups. The spatial modes{\textquoteright} distribution and overlap limit the available dynamic range and performance of the DME in the higher mode count case.},
	url = {https://www.osapublishing.org/oe/abstract.cfm?uri=oe-22-25-30520},
	author = {Miri Blau and Israel Weiss and Jonathan Gerufi and David Sinefeld and Moran Bin-Nun and Robert Lingle and Lars Gr{\"u}ner-Nielsen and Dan M. Marom}
}
