Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-12-29
1997-02-11
Shafer, Ricky D.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359484, 359495, 359496, 359497, G02B 530
Patent
active
056026730
ABSTRACT:
An optical isolator utilizes a pair of polarization selective elements, as for example birefringent wedges, and all integral Faraday rotator aligned therewith to perform optical signal isolation without introducing the polarization mode dispersion inherent in conventional polarization independent optical isolators. Optical isolation is accomplished by passing a forward-directed optical signal through a first birefringent element which separates the optical signal into two orthogonal states. The two orthogonal polarization states exchange identities upon entering the second birefringent element from the Faraday rotation element and are again deflected by the second birefringent element so that they emerge from the second element parallel to each other and, having traveled the same optical path length, witllout any polarization mode dispersion. Both polarization states of the reverse propagating optical signal are sufficiently angularly deflected to avoid coupling with the optical signal path.
REFERENCES:
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4464022 (1984-08-01), Emkey
patent: 4548478 (1985-10-01), Shirasaki
patent: 4712880 (1987-12-01), Shirasaki
patent: 5111330 (1992-05-01), VanDelden et al.
patent: 5151955 (1992-09-01), Ohta et al.
patent: 5237445 (1993-08-01), Kuzuta
patent: 5267078 (1993-11-01), Shirasshi et al.
patent: 5315431 (1994-05-01), Masuda et al.
patent: 5402509 (1995-03-01), Fukushima
patent: 5446578 (1995-08-01), Chang et al.
Matsumoto, "Polarization-Independent Isolators for Fiber Optics", Electronics and Communications in Japan, vol. 62-C, No. 7, 1979, pp. 113-116.
Compact optical isolator for fibers using birefringent wedges Applied Optics/ vol. 21, No. 23/ 1 Dec. 1982 pp. 4296-4299.
Polarization Independent Isolator Using Spatial Walkoff Polarizers IEEE Photonics Technology Letters, vol. 1. No. 3, Mar. 1989 pp. 68-70.
Lucent Technologies - Inc.
Shafer Ricky D.
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