Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-05-10
1998-12-22
Bacares, Rafael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359156, H04B 1006
Patent
active
058525076
ABSTRACT:
A polarization diversity receiver system for yielding multiple heterodyne optical output signals from an incident optical beam having a p-polarized component and an s-polarized component comprises first and second sequentially-arrayed polarizing beamsplitters, and three photodetectors, each of which receives a heterodyne optical signal. The polarization diversity receiver system tracks the largest of these three signals, and uses only this largest one for subsequent signal processing. There is a minimum for this largest signal that is dependent on the input polarizations of the two optical fields whose beat note is the heterodyne signal. Thus, the object is to maximize the minimum of this largest of the three heterodyne signals. The first polarizing beamsplitter ideally splits the incident beam into a transmitted beam portion including approximately 100% of the p-polarized component and approximately 33% of the s-polarized component, and a reflected beam portion including approximately 0% of the p-polarized component and approximately 67% of the s-polarized component. The reflected beam portion exits from the first polarizing beamsplitter as a first heterodyne optical output signal, and impinges on a first photodetector. The transmitted beam portion exits from the first beamsplitter, and then undergoes an effective 45.degree. rotation of its polarization eigenstates around its axis of propagation, either prior to or during its passage through the second polarizing beamsplitter. The second beamsplitter splits the rotated transmitted beam portion into second and third heterodyne optical output signals, which respectively impinge upon second and third photodetectors.
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