Controllers lock the operating point of modulators

Posted By : Enaie Azambuja
Controllers lock the operating point of modulators

LASER COMPONENTS introduces the iXBlue MBC-DG-LAB automatic bias controllers to lock the operating point of LiNbO3 Mach-Zehnder modulators and to ensure a stable operation over time and environmental conditions. The MBC-DG-LAB controllers are dither signal based, so superimpose a low amplitude, low frequency, tone on the modulation signal.

The resulting optical modulation is then detected and a digital signal processing technique, based on a FFT analysis principle, allows the operating point to be locked at the desired position. The controllers are continuously tuneable, allowing operation of the modulator at any point of its transfer function, so can be used for a large variety of applications. 

The new MBC-DG-LAB controllers have improved sensitivity and stability. The new controller is also easier to use, introducing an AUTOSET operation for the QUAD/MIN/MAX modes, a Graphical User Interface (GUI), storage and recovery of the user parameters and USB communication. 

The bias controllers are available as bench top instruments and OEM boards. iXBlue MBC-DG series controllers are especially well suited for digital and pulse applications. A ditherless version (MBC-AN) is also available. These controllers do not superimpose a tone signal on the optical modulated signal and are typically used for analogue applications.


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