MZ modulator Q point bias controller
The MBC-Q bias voltage controller from Plugtech is a high-performance automatic bias voltage controller specifically designed for MZ intensity modulators. Its principle involves injecting a dither signal into the modulator, continuously analyzing the modulator's working state, and adjusting the output DC bias voltage to compensate for working point drift caused by external environmental changes. Thanks to its excellent control algorithm design, users can precisely lock the modulator at common Quad+ and Quad- working points through simple operations, ensuring long-term stable operation. The MBC-Q controller provides very high output stability, with the modulator's output optical power stability reaching ±0.04dB when paired with the MBC-Q controller.
The MBC-Q controller supports serial communication. Users can switch the controller's working mode (automatic/manual), customize the output voltage, adjust the dither signal amplitude, read system working parameters, and set special working points via GUI software or by sending standard commands.

MBC-Q-06
MZ modulator Q point bias controller
Features
• Part No.: MBC-Q-06
• Compact size: 38*28*12mm
• Stabilize the system in TYP 6 seconds
• Special point locking around Quad point (± 70 degree)
• Power stability ±0.02dB
• Fully digital control for superior tracking speed
• UART commands or GUI control supported
Applications
• Digital NRZ, RZ, PAM mdoualtion
• CATV Transmitter
• Analog Link, RoF transmitter
Options
• Wavelength: 1550nm (default), 850nm (optional)
• On-board photodiode: Regular SM PD (default), SM 1% Tap PD (optional), PM 1% Tap PD (optional)
• Dither Frequency: 1.0kHz (default), 1.25kHz (optional), 1.5kHz (optional), 1.75kHz (optional)