We present a method of glucose concentration detection in the anterior chamber with a differential absorption optical low-coherent interferometry (LCI) technique. Back-reflected light from the iris, passing through the anterior chamber twice, was selectively obtained with the LCI technique. Two light sources, one centered within (1625 nm) and the other centered outside (1310 nm) of a glucose absorption band were used for differential absorption measurement. In the eye model and pig eye experiments, we obtained a resolution glucose level of 26.8 mg/dL and 69.6 mg/dL, respectively. This method has a potential application for noninvasive detection of glucose concentration in aqueous humor, which is related to the glucose concentration in blood.
We firstly propose an approach to compensate the polarization mode dispersion (PMD) effectively in optical
true time delay (TTD) system composed of a Faraday Rotation Mirror (FRM), a normal 3-port circular. The
TTD system can preserve an arbitrary input state of polarization regardless of any external perturbations, and
is complete free from polarization effects. We demonstrate experimentally the polarization-stability of the TTD
system and discuss the RF correspond of the TTD system.