Optical waveguides – Polarization without modulation
Patent
1996-09-06
1997-11-18
Lee, John D.
Optical waveguides
Polarization without modulation
359495, 359497, 385 34, 385 36, 385 47, G02B 627, G02F 129
Patent
active
056895933
ABSTRACT:
A compact optical circulator which can be expanded into a large number of optical ports is provided. For each port, the circulator has an optical port assembly which has an end of an optical fiber, a collimator subassembly and a birefringent crystal. The collimator subassembly collimates light from the optical fiber end into a beam of collimated light and focusses a beam of collimated light to the optical fiber end in a reverse direction. The birefringent crystal is dimensioned and arranged with respect to the collimator subassembly to split the collimated light beam from the collimator subassembly into two parallel beams of light linearly polarized perpendicularly to each other, and to combine parallel beams of light linearly polarized perpendicularly to each other in the reverse direction into a beam of collimated light toward the collimator subassembly. The optical port assemblies are arranged in a linear array and a combination of polarization interfaces and planar reflecting surfaces guide the light beams between the optical port assemblies so that the circulator can be designed with as many optical ports as desired.
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Huang Yonglin
Pan J. J.
E-Tek Dynamics, Inc.
Lee John D.
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