Optical: systems and elements – Polarization without modulation – Polarization using a time invariant electric – magnetic – or...
Patent
1992-06-08
1993-03-02
Gregory, Bernarr E.
Optical: systems and elements
Polarization without modulation
Polarization using a time invariant electric, magnetic, or...
359281, G02F 109
Patent
active
H00011550
ABSTRACT:
An optical isolator is disclosed which comprises a Faraday rotator disposed between a pair of polarization selective elements (e.g., linear polarizers, birefringent wedges, birefringent plates, etc.). Improvement in isolation stability as a function of variations in temperature and/or signal wavelength are achieved in accordance with the teachings of the present invention by utilizing a Faraday device with a rotation .theta. less than the conventional 45.degree.. A linear reduction in .theta., while resulting in a some signal loss, provides a linear increase in both temperature and wavelength stability.
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Fratello Vincent J.
Jameson Ralph S.
Licht Steven J.
American Telephone and Telegraph Company
Gregory Bernarr E.
Koba Wendy W.
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