Integrated-optic endless polarization transformer

Details Integrated-optic endless polarization transformer Integrated-optic endless polarization transformer

1989-08-10

1990-10-30

Lee, John D.

350 9615, G02B 614

Patent

active

049664310

ABSTRACT:
Cascadability and simplicity of design and operation are primary attributes of a novel electrooptic polarization transformer for reset-free endless polarization control that allows general polarization transformations from any arbitrarily varying input and into any arbitrarily varying output polarization by producing adjustment elliptical birefringence of constant total phase retardation in a single-mode waveguide. Here, a particular transformation is obtained by adjusting the azimuth of linear birefringence and the ratio of linear to circular birefringence. In this integrated-optic realization, the endless polarization transformer includes at least one cascadable transformer section comprising a first TE.rarw..fwdarw.TM mode converter followed by a first TE/TM phase shifter followed by a second TE.rarw..fwdarw.TM mode converter and a second TE/TM phase shifter. The sections are formed over a birefringent waveguide capable of supporting propagation of TE and TM optical signal modes.

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Electronics Letters, 17th Jul. 1986, vol. 22, No. 15, pp. 772-773, "Endless Polarisation Control in Coherent Optical Communications".
Journal of Lightwave Technology, vol. 6, No. 7, Jul. 1988, pp. 1199-1208, "Endless Polarization Control Systems for Coherent Optics", Noe et al.
Journal of Lightwave Technology, vol. 7, No. 7, Jul. 1989, pp. 1033-1043, "New Endless Polarization Control Method Using Three Fiber Squeezers", Wim H. J. Aarts and Giok-Djan Khoe.
Electronics Letters, 16th Jan. 1986, vol. 22, No. 2, pp. 78-79, "Endlessly Rotatable Fractional-Wave Devices for Single-Mode-Fibre Optics".
Electronics Letters, 26th Mar. 1987, vol. 23, No. 7, pp. 335-336, "Polarisation Transformer on Ti:LiNbO.sub.3 with Reset-Free Optical Operation for Heterodyne/Homodyne Receivers".

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