Patent ID: 8730484

Claim:
An apparatus comprising: a beam splitter having a first surface and a second surface that collectively define a cavity length, at least one of the first surface and second surface being physically adapted to move in response to an environmental stimulus such that the beam splitter distributes a plurality of input optical signals received at the first surface into a plurality of first optical signals and a plurality of second optical signals based on the environmental stimulus; a source that is operative for providing a plurality of input optical signals that comprises a first input optical signal and a second input optical signal; and a first plurality of photodetectors that generate a plurality of first electrical signals based on the plurality of first optical signals, wherein each of the first plurality of photodetectors is proximal to the first surface and distal to the second surface; wherein the beam splitter and the source are arranged such that the beam splitter receives (1) the first input optical signal at a first location on the first surface and at a first angle and (2) the second input optical signal at a second location on the first surface and at a second angle; and at least one of (a) the first location and second location are different and (b) the first angle and the second angle are different; and wherein the beam splitter and the first plurality of photodetectors are arranged such that each of the first plurality of photodetectors receives a different first optical signal of the plurality of the first optical signals from the first surface.