Table 2.

Background signal components normalized to the object signal.

	Uncoated	AR coating	Crossed polarizers	NA-sharing
Proximal air–fiber reflection	34.2	7.18	0.35	0.24
Fiber internal backscatter	$\sim 0$	$\sim 0$	$\sim 0$	$\sim 0$
Distal fiber–cement reflection	0.003	0.003	0.003	0.003
Distal cement–GRIN reflection	0.19	0.19	0.19	0.19
Distal GRIN–AR coating reflection	0.54	0.54	0.54	0.54
Resulting SBR	0.03	0.13	0.92	1.03