  With a fantastic sensitivity improving significantly over the advanced GW
detectors, Einstein Telescope (ET) will be able to observe hundreds of thousand
inspiralling double compact objects per year. By virtue of gravitational
lensing effect, intrinsically unobservable faint sources can be observed by ET
due to the magnification by intervening galaxies. We explore the possibility of
observing such faint sources amplified by strong gravitational lensing.
Following our previous work, we use the merger rates of DCO (NS-NS,BH-NS,BH-BH
systems) as calculated by Dominik et al.(2013). It turns out that tens to
hundreds of such (lensed) extra events will be registered by ET. This will
strongly broaden the ET's distance reach for signals from such coalescences to
the redshift range z=2 - 8. However, with respect to the full inspiral event
catalog this magnification bias is at the level of 0.001 and should not affect
much cosmological inferences.
