H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/04 (2006.01) G02F 1/01 (2006.01)
Patent
CA 2134715
ABSTRACT There is provided an optical external modulator that can modu- late the polarization of incident light without regulating the state of polarization of the light entering the modulator. Such a modulator can be suitably incorporated into an optical telecommunications system. An optical external modulator according to the invention comprises a sub- strate 1, an optical transmission line 7, a polarization modulating section 11 and a phase changing section 8 for changing the state of polarization of the light passing through the optical transmission line by applying stress to the optical transmission line 7 as a function of a modulation signal given to the modulator such that the phase difference between the X-component and the Y-component of the light being propagated through the optical transmission line 7 is shifted by (2m-1)*.pi./2 (m is a positive integer).
Hikami Toshiya
Murata Matsue
Negami Shoichi
Nishikawa Shigeaki
Ridout & Maybee Llp
The Furukawa Electric Co. Ltd.
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