In this paper the switching of a proposed Stationary Optical Delay Line (SODL) is demonstrated. This is intended for
proof of principle of the switching associated with such a SODL, to be applied to an Optical Coherence Tomography
(OCT) system.. The proposed SODL is made up of one dimensional beam expanding cylindrical lenses, a liquid crystal
transmissive Spatial Light Modulator (SLM), and a Stepped Mirrored Structure (SMS). The SLM is to be used as an
addressable optical switch. The SMS is an array of staggered mirrored steps, where the step height corresponds to half
the optical delay length. The required delay length from the SMS can then be selected with the SLM. In this work, beam
expanding optics and a nematic Liquid Crystal Display (LCD) are used to demonstrate the ability to select a spatial
region consisting of a row of 4 photodiodes substituting for the SMS. The principle of conventional sequential switching,
depth hoping, and multicasting of the four windows generated on the SLM are demonstrated. Rise and fall times were
260 and 150 ms, sufficient to prove the principle of switching at 1Hz. A maximum of 2 Hz could be achievable without
detriment to the contrast ratio. The contrast ratios between transparent and opaque LCD window states was 2.4 ± 0.2.
The contrast ratios between transparent and light-off states was 23 ± 4. Hence, the contrast ratios between opaque and
light-off states was 9 ± 1. These values were within the expected ranges for nematic LC SLMs.