Free-space optical hybrid

Details Free-space optical hybrid Free-space optical hybrid

2007-03-27

2009-08-11

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

07573641

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, S−jL, are produced. The phase difference of S and L at the four output ports is phi_0, phi_0+90-degrees, phi_0+180-degree, phi_0+270-degree, where the phase difference between S and L at the S+L port is an arbitrary number phi_0 and the phase difference between S and L at the other output ports, S−L, S+jL, S−jL, is 90, 180 and 270, respectively, shifted from phi_0.

REFERENCES:
patent: 6587204 (2003-07-01), Hsieh
patent: 7106508 (2006-09-01), Du et al.
patent: 7110677 (2006-09-01), Reingand et al.
patent: 7145727 (2006-12-01), Hsieh
patent: 7408713 (2008-08-01), Hsieh et al.
patent: 2003/0058499 (2003-03-01), Reingand et al.
patent: 2007/0070505 (2007-03-01), Hsieh
patent: WO 2007/126846 (2007-11-01), None
International Search Report (PCT/ISA/210) prepared for International Application (PCT/US2007/007606), prepared by the United States Patent and Trademark Office on Jan. 14, 2008.

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