Optical modulation apparatus

Details Optical modulation apparatus Optical modulation apparatus

1994-06-22

1996-05-28

Epps, Georgia Y.

Optical: systems and elements

Optical demodulator

359187, 25022721, G02F 200

Patent

active

055217494

ABSTRACT:
In accordance with a mean value of a modulated light supplied from an optical modulator utilizing electro-optic effect, the drift amount of voltage light output characteristics (an operative point voltage of the optical modulator) is obtained. When the operative point voltage becomes over E.sub.CNT or below -E.sub.CNT, that is, it is out of a voltage range of -E.sub.CNT to E.sub.CNT, a bias voltage is controlled to have a different polarity and a voltage difference which is less than a predetermined value from the operative point voltage. The direction of the DC drift is changed dependent on the polarity of the bias voltage. Therefore, the operative point voltage is maintained within a predetermined voltage range without suspending the communication operation by controlling the bias voltage as described above.

REFERENCES:
patent: 4162398 (1979-07-01), Kayanuma
patent: 5054116 (1991-10-01), Davidson
Patent Abstracts of Japan, vol. 15, No. 449 (P-1275), Nov. 14, 1991; JP-A-03 189616, Aug. 19, 1991.

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