DRIVING METHOD OF LASER DIODE

PURPOSE:To realize a wide allowable range in an application state, by making the width of a repetition light emitting pulse narrower than the period necessary for laser oscillation to move to a longitudinal mode and the period until a reflected light returyns, and setting the duty factor less than 5...

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Bibliographic Details
Main Author KURAMOCHI YUZO
Format Patent
LanguageEnglish
Published 12.11.1991
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PURPOSE:To realize a wide allowable range in an application state, by making the width of a repetition light emitting pulse narrower than the period necessary for laser oscillation to move to a longitudinal mode and the period until a reflected light returyns, and setting the duty factor less than 50%. CONSTITUTION:Inverters 1a-1e connected in a ring type constitute a ring oscillator. Outputs of the inverters 1a-1e are set as nodes n1-n5, respectively. The inputs of an AND circuit 2 are connected with the node n4 and the node n5. The output of the AND circuit 2 is connected with the gate electrode of a driving FET 3. The oscillation period of the ring oscillator is twice the product of the delay time of one stage of the inverters 1a-1e and the number of stage (five in this case). The duty factor of driving pulses is 10%. Thereby the driving of a laser diode wherein adjustment is unnecessitated and the allowable range in an application state is wide can be realized.
Bibliography:Application Number: JP19900049263