Apparatus for amplitude modulating the output of a laser diode or L.E.D

The output of a laser diode or L.E.D. is amplitude modulated by varying the forward current through it. This is done by applying a dc current component from a first current source and an ac current component from another part of the circuit. The ac current component is applied to the laser diode or...

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Hauptverfasser:	HEARD, MAURICE C
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS DEVICES USING STIMULATED EMISSION ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY TRANSMISSION
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Beschreibung
Zusammenfassung:	The output of a laser diode or L.E.D. is amplitude modulated by varying the forward current through it. This is done by applying a dc current component from a first current source and an ac current component from another part of the circuit. The ac current component is applied to the laser diode or L.E.D. via an ideal impedance matching transformer which includes the internal capacitance of the laser diode or L.E.D, such that when the frequency of the modulating signal is varied, and hence the response of the laser diode or L.E.D varies, ideal matching is still obtained since the internal capacitance enables compensation to be made.