Polarization preserving optical isolator

Details Polarization preserving optical isolator Polarization preserving optical isolator

1989-03-23

1995-08-29

Shafer, Ricky D.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359484, 359495, 359496, 359497, 372703, G02B 530

Patent

active

054465788

ABSTRACT:
At least one non-reciprocal rotation element is interposed between two adjacent walk off crystal members to form an optical isolator. Light in the forward direction is separated into two rays of linear polarizations where there is substantially no optical path length difference between the two rays. Light transmitted in the reverse direction is reduced. A conventional optical isolator which does not preserve optical path length difference is converted into one which does by adding a birefringent plate to compensate for the optical path length difference introduced by the conventional isolator. A pair of collimating lenses may be introduced between any pair of non-reciprocal rotation elements.

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patent: 4239329 (1980-12-01), Matsumoto
patent: 4375910 (1983-03-01), Seki
patent: 4548478 (1985-10-01), Shirasaki
patent: 4712880 (1987-12-01), Shirasaki
patent: 4974944 (1990-12-01), Chang
0121027 061986jpx 350 394 63Matsumoto, "Polarization-Independent Isolators for Fiber Optics", Electronics and Communications in Japan, vol. 62-C, No. 7 1979 pp. 113-118.
High-Performance Optical Isolator, Jun. 3, 1987, Fuji Electrochemical Co., Ltd., Tokyo, Japan.
"Compact optical isolator for fibers using birefringent wedges", M. Shirasaki et al., Applied Optics, vol. 21, No. 23, 1 Dec. 1982, pp. 4296-4299.
"Optical Isolator for Single Mode Fiber", M. Shirasaki et al, Digest of European Conference of Optical Communication, vol. 2.
"Optical Isolation with Ultrahigh Isolation", N. Fukushima, Digest of Annual Meeting of Electronics and Communication Engineers of Japan, 1984, p. 355.

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