Optical module
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United States of America Patent
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Jul 19, 2005
Grant Date -
Jul 3, 2003
app pub date -
Dec 16, 2002
filing date -
Dec 25, 2001
priority date (Note) -
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Abstract
An optical fiber that transmits laser beams generated by a laser diode in an optical module is provided with a fiber grating. The fiber grating passes most of the laser beams and reflects some of them to a photodiode provided on the back side of the laser diode. The photodiode also receives scattered laser beams from the laser diode. The photodiode outputs a current equivalent to the amount of received laser beams. An APC circuit controls emission of laser beams by the laser diode based on this current.
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