  Fiber imaging bundles are widely used as thin, passive image conduits for
miniaturised and endoscopic microscopy, particularly for confocal fluorescence
imaging. Holographic microscopy through fiber bundles is more challenging;
phase conjugation approaches are complex and require extensive calibration.
This articles describes how simple inline holographic microscopy can be
performed through an imaging bundle using a partially coherent illumination
source from a multimode fiber. The sample is imaged in transmission, with the
intensity hologram sampled by the bundle and transmitted to a remote camera.
The hologram can then be numerically refocused for volumetric imaging,
achieving a resolution of approximately 6 um over a depth range of 1 mm. The
scheme does not require any complex prior calibration and hence is insensitive
to bending.
