Method for controlling the operating range of a modulator, and an associated drive unit
AssigneeSiemens Aktiengesellschaft
InventorsCornelius Fuerst, Harald Geiger, Georg Mohs
Life of this patent
Estimating the term…
Abstract
Method for controlling the operating range of a modulator, and an associated drive unit, the operating range of the modulator being controlled via a control circuit such that the operating range is stable over a long period of time and in different operating conditions, relative to the transmission characteristic of the modulator.
Claims19
A method for controlling an operating range of a modulator, wherein the modulator produces modulated output radiation from input radiation as a function of a control signal, and the actual operating range of the modulator with respect to its transmission characteristic depends on an amplitude of the control signal, the method comprising the steps of:
- detecting the mean radiation power of the output radiation in at least one predetermined frequency range;
- forcing cyclic deflection of the operating range to occur at a deflection frequency;
- producing a control signal for controlling the operating range as a function of the deflection of the operating range;
- and
- varying the amplitude of the control signal as a function of the control signal.
A drive unit for controlling the operating range of a modulator, the unit comprising:
- a transducer unit which produces an output signal as a function of the output radiation from a modulator, with a signal value of the output signal being a measure of radiation power;
- an operating range deflection unit for cyclic deflection of the operating range at a deflection frequency;
- an operating range control unit for producing a control signal for controlling the operating range as a function of the output signal from the transducer unit and as a function of the deflection of the operating range;
- and
- an adjustment unit for varying the amplitude value of a control signal for the modulator as a function of the control signal.
Dependencies are inferred from the claim text.