Optical attenuator

Details Optical attenuator Optical attenuator

1998-05-21

2000-04-25

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359494, 359501, 385 11, 385140, G02B 530, G02B 600

Patent

active

060551046

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: 4239329 (1980-12-01), Matsumoto
patent: 5033830 (1991-07-01), Jameson
patent: 5276747 (1994-01-01), Pan
patent: 5499132 (1996-03-01), Tojo et al.
patent: 5546219 (1996-08-01), Iida
patent: 5689359 (1997-11-01), Kurata et al.
patent: 5727109 (1998-03-01), Pan et al.
patent: 5867300 (1999-02-01), Onaka et al.

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