Optical transmitter device

Details Optical transmitter device Optical transmitter device

2007-05-08

2007-05-08

Bello, Agustin (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S192000

Reexamination Certificate

active

11044181

ABSTRACT:
An optical transmitter device capable of high-speed shutdown of optical output. A bias controller generates a low-frequency signal, extracts the frequency component of a low-frequency signal from an electrical signal fed back thereto, and compares the phase of the frequency component of the low-frequency signal generated thereby with that of the frequency component of the extracted low-frequency signal, to generate a direct-current voltage with which the operating point of an optical modulator is optimized. Using a half-wave voltage of the optical modulator and an optimum voltage, a bottom voltage calculation unit calculates a bottom voltage corresponding to a minimum of the operation characteristic curve of the modulator. A voltage selection unit selects the direct-current voltage during normal operation, to apply the optical modulator with a bias voltage derived from the direct-current voltage, and selects the bottom voltage at the time of shutdown, to apply the bottom voltage to the modulator.

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Patent Abstracts of Japan, Publication No. 11-340919, Published Dec. 10, 1999.

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