Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1998-12-21
2000-04-04
Ben, Loha
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359130, 359156, 359251, 359305, 359122, 356364, 385 24, 3242441, G02F 103
Patent
active
060468394
ABSTRACT:
An object of the invention is to provide a polarization scrambler wherein the polarization of linearly polarized signal light can be rotated to facilitate obtaining a minimum degree of polarization, and wherein scrambling operation is possible even if signal light of optional polarization states is input. Accordingly with the polarization scrambler, a polarization rotation section is provided on an input side on a chip on which is formed an optical waveguide, and a polarization scrambling section is provided on an output side. With the polarization rotation section, the polarization of linearly polarized signal light which is transmitted by the optical waveguide is rotated by means of an acousto-optic effect due to an elastic surface wave generated by an electrode, so as to become 45.degree. with respect to a vertical direction of the optical waveguide. With the polarization scrambling section, the polarization of the signal light from the polarization rotation section is scrambled in accordance with a modulation signal.
REFERENCES:
patent: 5127066 (1992-06-01), Poggiolini
patent: 5329394 (1994-07-01), Calvani et al.
patent: 5739943 (1998-04-01), Ohshima et al.
patent: 5841571 (1998-11-01), Terahara
patent: 5920413 (1999-07-01), Miyakawa et al.
OFC '98 Postdeadline Papers (Feb. 26, 1998).
Ito Tomoyuki
Kubota Yoshinobu
Ohtani Toshihiro
Omori Yasuhiro
Ben Loha
Fujitsu Limited
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