Method for controlling the polarization of an optical signal...

Details Method for controlling the polarization of an optical signal... Method for controlling the polarization of an optical signal...

2005-07-19

2005-07-19

Bovernick, Rodney (Department: 2874)

Optical waveguides

Polarization without modulation

C385S001000, C385S004000, C385S008000

Reexamination Certificate

active

06920254

ABSTRACT:
By a method for controlling the state of polarization (SOP) of an optical signal transmitted through an optical waveguide, the waveguide is buried in a planar structure and a plurality of stress-applying films, having variable stress, are placed on the top of the structure. Preferably the stress-applying films comprise materials that have thermal expansion coefficients different from that of the planar structure or comprise materials with piezoelectric properties. In this way it is possible to produce a cascaded series of optical elements with variable linear birefringence in a planar optical waveguide. Moreover according to the invention it is possible, by the method according to the invention, to manufacture optical components having an active polarisation controller.

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Masayuki Okuno et al. “Birefringence Control Of Silica Waveguides On SI And Its Application To Polarization-Beam Splitter/Switch”. Journal of Lightwave Technology, vol. 12, No. 4; Apr. 1994, pp. 625-633.

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