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![]() ![]() A polarization independent optical isolator as defined in claim 6 wherein the first and second compensating plates comprise quartz halfwave plates.Ĩ. ![]() A polarization independent optical isolator as defined in claim 1 wherein the first and second reciprocal rotating means comprise first and second compensating plates, with the optical axis of said first compensating plate oriented at an angle of approximately 22.5° with respect to the second compensating plate.ħ. A polarization independent optical isolator as defined in claim 2 wherein the Faraday rotator functions to rotate each ray through a predetermined angular displacement θ of approximately 22.5°.Ħ. A polarization independent optical isolator as defined in claim 2 wherein the Faraday rotator includes a bismuth-substituted garnet film and samarium-cobalt magnet surrounding said film.ĥ. A polarization independent optical isolator as defined in claim 2 wherein the Faraday rotator includes a yttrium-iron-garnet film and a samarium-cobalt magnet surrounding said film.Ĥ. A polarization independent optical isolator as defined in claim 1 wherein the non-reciprocal rotating means comprises a Faraday rotator.ģ. Reflection means for redirecting first and second orthogonal rays exiting said non-reciprocal rotating means back into said non-reciprocal rotating means, wherein the reflection causes said first and second rays to exchange physical locations Ī first reciprocal rotating means disposed between said birefringent plate and said non-reciprocal rotating means so as to intercept said first and second orthogonal rays exiting said birefringent plate in the transmitting direction and intercept said rays exiting said non-reciprocal rotation means in the isolation direction, said first reciprocal rotating means functioning to rotate said rays through a predetermined angle α in the transmitting direction and -α in the isolation direction Ī second reciprocal rotating means disposed between said birefringent plate and said non-reciprocal rotating means so as to intercept said rays exiting said non-reciprocal rotating means in the transmitting direction and intercept said rays exiting said birefringent plate in the isolation direction, said second reciprocal rotating means functioning to rotate said rays through a predetermined angle α in the transmitting direction and -β in the isolation direction, wherein the sum α+2θ+β approximately equals 90° in the transmitting direction such that said first and second rays exchange polarization states upon traveling through said isolator in the transmitting direction, and in the isolation direction the sum 2θ-α-β approximately equals 0° such that the first and second rays maintain polarization states upon traveling through said isolator in the isolation direction.Ģ. Non-reciprocal rotating means functioning to rotate said first and second rays through a predetermined angle θ in either the transmitting direction or the isolation direction A polarization independent optical isolator comprisingĪ birefringent plate for separating an optical signal passing therethrough into first and second rays having first and second orthogonal polarizations wherein the ray of the first polarization experiences spatial displacement in a first direction as it passes through said birefringent plate in a first, transmitting direction and spatial displacement in a second, opposite direction as it passes through said birefringent plate in a second, isolation direction
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