Low-power, stabilized, photonic modulator system

A simple, low-power feedback control loop is arranged to set the operating point of a photonic intensity modulator. The loop includes photodetectors which are respectively illuminated with a sample of the carrier signal into the modulator and the modulated signal out of the modulator. A comparison n...

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Bibliographische Detailangaben
Hauptverfasser:	SCHAFFNER, JAMES H, HAMMOND, MARK B
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A simple, low-power feedback control loop is arranged to set the operating point of a photonic intensity modulator. The loop includes photodetectors which are respectively illuminated with a sample of the carrier signal into the modulator and the modulated signal out of the modulator. A comparison network develops an error signal which is integrated and applied to the voltage modulating port of the modulator. The comparison network includes voltage dividers for adjusting the transfer function operating point of the modulator. The control loop is especially suited for stabilizing Mach-Zehnder and directional coupler modulators.