Polarization independent optical isolator

Details Polarization independent optical isolator Polarization independent optical isolator

1989-10-04

1991-07-23

LaRoche, Eugene R.

350377, 350385, 350388, G02B 530

Patent

active

050338307

ABSTRACT:
A polarization independent optical isolator is disclosed which uses a single birefringent plate. A pair of stacked reciprocal rotators, a Faraday rotator, and reflector are positioned in tandem adjacent to the birefringent plate. In the forward (transmitting) direction, a lightwave signal exiting an optical fiber is split into a pair of orthogonal rays by the birefringent plate. The orthogonal rays then pass through a first reciprocal rotator and the Faraday rotator. The rotated rays are then redirected by the reflector back through the Faraday rotator. After passing through the second reciprocal rotator, the orthogonal rays re-enter the same birefringent plate where they are recombined and launched in an output fiber. Since a Faraday rotator is a non-reciprocal device, any signal traveling through the isolator in the reverse (isolation) direction will be split on both passes through the birefringent plate such that neither will intercept the input fiber.

REFERENCES:
patent: 3719414 (1973-03-01), Wentz
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4461543 (1984-07-01), McMahon
patent: 4548478 (1985-10-01), Shirasaki
patent: 4656433 (1987-04-01), Franklin et al.
patent: 4712880 (1987-12-01), Shirasaki
patent: 4770505 (1988-09-01), Okazaki
Grischkowsky; "Low-Loss, Double-Pass System for Laser Amplifiers", IBM Technical Disclosure Bulletin, vol. 14, No. 11, Apr. 1972, pp. 3485-3486.
"Polarization-Independent Isolators for Fiber Optics", Trans. IECE of Japan, vol. E62, No. 7, pp. 516-517, T. Matsumoto.
"Polarization-Independent Optical Circulator: An Experiment", Applied Optics, vol. 19, No. 1, Jan. 1980, pp. 108-112, T. Matsumoto et al.
"Compact Polarization-Independent Optical Circulator", Applied Optics, vol. 20, No. 15, Aug. 1981, pp. 2683-2687, M. Shirasaki et al.
"A Polarization-Independent Optical Circulator for 1.3 um", Journal of Lightwave Technology, vol. LT-1, No. 3, Sep. 1983, pp. 466-469, W. L. Emkey.
"Magneto-Optic Circulator for Optical Fiber Transmission", Journal of Appl. Physics, vol. 65, No. 4, Feb. 1989, pp. 1664-1665, X. Yan et al.
"Polarization Independent Isolators Using Spatial Walkoff Polarizers", IEEE Photonics Tech. Lett., vol. 1, No. 3, Mar. 1989, pp. 68-70, D. W. Chang et al.

Affiliated with

Also associated with

Rating

Polarization independent optical isolator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polarization independent optical isolator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarization independent optical isolator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-428912