Patent ID: 11881682
Assignee: TOPTICA PHOTONICS AG
Field: Optics (Instruments)
Classification: CPC G  H | IPC H

Claim 14:
15. The system according to claim 14, wherein the feed-forward control apparatus has a multi-channel structure, wherein each channel is assigned to an actuating-signal component of the second actuating signal and wherein each channel comprises:
an IQ demodulator, which is configured to generate a complex detection signal by phase-sensitive demodulation of the error signal at the associated harmonics,
an IQ controller, which is connected downstream of the IQ demodulator and is configured to convert the complex detection signal into a complex control signal in accordance with a transfer function,
an IQ modulator, which is connected downstream of the IQ controller and is configured to generate the actuating-signal component by modulation of the associated harmonics in accordance with the complex control signal,
wherein the feed-forward control apparatus comprises an adder, which is connected to the IQ modulators of all the channels and is configured to generate the second actuating signal by addition of the actuating-signal components.