Polarizing beam splitter/combiner

Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers

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359494, 359497, 385 11, G02B 530

Patent

active

060142561

ABSTRACT:
A polarization beam splitter combiner uses a birefringent crystal that is a fraction of the size of conventional crystals used in similar devices. Since the crystal is considerably shorter in length, the beam passing through the crystal can be uncollimated, spreading very little from one end to the other. Launching uncollimated beams through a short small crystal obviates the requirement for lenses at the end face of the crystal having two waveguides coupled thereto. Since lenses are not required the waveguides at the input/output end face can be very closely spaced apart. Conventional lensed devices utilizing a pair of lenses at an input/output end face must be considerably larger in order to accommodate the lenses and resulting collimated beams.

REFERENCES:
patent: 5033830 (1991-07-01), Jameson
patent: 5428477 (1995-06-01), Siroki
patent: 5446578 (1995-08-01), Chang et al.
patent: 5499132 (1996-03-01), Tojo et al.
patent: 5499307 (1996-03-01), Iwatsuka
patent: 5574595 (1996-11-01), Kurata et al.
patent: 5740288 (1998-04-01), Pan
patent: 5848203 (1998-12-01), Kawakami et al.

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