Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1997-03-17
2000-07-18
Schuberg, Darren E.
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359484, 359497, G02B 530
Patent
active
060915439
ABSTRACT:
The present invention teaches a methodology for producing parallel beams having like polarizations or parallel like polarization modes (PLPM) without utilizing 90 degree polarization interchangers, e.g., half wave plates. By utilizing Faraday rotators in combination with one or more walk off devices, non-reciprocal termination of PLPM can be achieved without half wave plates. According to one advantageous embodiment of the invention an optical apparatus of the present invention comprises a first walk-off device having a first optical port at a first end thereof and a second and third optical port at a second end thereof. A first Faraday rotator is coupled in an optical path with the second optical port of the first walk off device and a second Faraday rotator is coupled in an optical path with the third optical port of the first walk off device, where each of the Faraday rotators are made from the same material and provides a polarization rotation opposite to each other which is a multiple of 45 degrees. In an alternate embodiment of the present invention a second walk off device is disposed between the first walk off device and the first and second Faraday rotators, where the second walk off device includes first and second optical ports at a first end thereof aligning with the second and third optical ports of the first walk off device and third and fourth optical ports at a second end thereof aligning with the first and second Faraday rotator, respectively. The first and second walk off device produce beam polarizations which are substantially at a 45 degree angle with respect to the parallel beam separation at the second end of the second walk off device.
REFERENCES:
patent: 5204771 (1993-04-01), Koga
patent: 5608570 (1997-03-01), Brandle, Jr. et al.
M. Koga, "Compact quartzless optical quasi-circulator", Electronic Letters, Aug. 18, 1994, pp. 1438-1440.
Lucent Technologies - Inc.
Schuberg Darren E.
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