Free-space optical hybrid

Details Free-space optical hybrid Free-space optical hybrid

2011-01-04

2011-01-04

Spector, David N (Department: 2873)

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

C359S640000, C359S583000, C398S115000

Reexamination Certificate

active

07864433

ABSTRACT:
An exemplary optical hybrid includes a 50/50 un-polarized beam splitter, a folding prism, a beam shifter, a spacer and a phase shifter such that from an input S-beam (signal) and an L-beam (reference), four outputs, S+L, S−L, S+jL and S−jL, are produced. The phase difference between the two components of each output beam produced by the S and L beams in the optical hybrid is θ+0, θ+90, θ+180, or θ+270 degrees, where θ is the phase difference of the signal beam with respect to the reference beam. In an alternative embodiment, the phase difference between the two components of each output beam produced by the S and L beams in the optical hybrid is θ+0, θ+X, θ+180, or θ+180+X degrees, where X is an arbitrary number of degrees greater than 0 and smaller than 180.

REFERENCES:
patent: 7145727 (2006-12-01), Hsieh
patent: 7408713 (2008-08-01), Hsieh et al.
patent: 2007/0070505 (2007-03-01), Hsieh

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