Optical external modulator for optical telecommunications

Details Optical external modulator for optical telecommunications Optical external modulator for optical telecommunications

1994-10-31

1995-11-28

Healy, Brian

Optical waveguides

Temporal optical modulation within an optical waveguide

385 2, 385 3, 385 11, 385 28, 385 31, 385 39, G02F 101

Patent

active

054715458

ABSTRACT:
There is provided an optical external modulator that can modulate 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 substrate 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).

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