Dual-Parallel-MZ-Modulator Bias Controller is a device specially designed to control the bias positions for dual-parallel-modulator used for DQPSK or SSB (Single Side Band) applications. DQPSK (Differential quadrature phase-shift key) modulator can improve optical transmission properties such as total reach, dispersion tolerance, or spectral efficiency. Since the Dual Parallel modulator is a combination of phase modulator and Mach-Zehnder modulators, there are three bias points requiring controllers. YY Labs’ Dual-Parallel-MZ modulator bias controller has been developed especially for this kind of device.

- Three modulators can be controlled with one controller (1st, 2nd modulator at Null/peak mode, the 3rd at Quad)
- User selectable locking slope (QUAD+ ⇔ QUAD-, NULL ⇔ PEAK)
- User selectable function: DQPSK ⇔ SSB
- The locking point is tunable to other desired point other than Quad, Peak or Null
- Tune-ability can be switched off and on
- Two photodiodes are integrated in the controller with option to use one external PD integrated in the modulator for quad point locking
- Two operation modes: calibration mode and locking mode
- Calibration-off mode for quick system setup in locking mode
- Low profile (3.5” * 2.0” * 0.65”)